diff --git a/WORKSPACE b/WORKSPACE
index 67c7f5117c..23c8bb9cac 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -63,7 +63,7 @@ examples_repositories()
 
 load("@examples//:examples_deps.bzl", examples_deps = "deps")
 
-examples_deps()
+examples_deps(is_top_level = True)
 
 load("@examples//:examples_transitive_deps.bzl", examples_transitive_deps = "transitive_deps")
 
diff --git a/cargo/crate_universe_resolver/CONTRIBUTING.md b/cargo/crate_universe_resolver/CONTRIBUTING.md
new file mode 100644
index 0000000000..6f0958b0e7
--- /dev/null
+++ b/cargo/crate_universe_resolver/CONTRIBUTING.md
@@ -0,0 +1,40 @@
+# Contributing
+
+## Tour of the codebase
+
+We start at `workspace.bzl`, which invokes the resolver.
+
+The resolver:
+* `config.rs`: Deserializes the Config
+* `parser.rs`: Parses the Config, any `Cargo.toml` files, and any additional packages, into a single unified `Cargo.toml` file
+* `resolver.rs`: Resolves all of the crates.
+* `consolidator.rs`: Patches in any WORKSPACE-specified overrides, and deals with platform-specific concerns.
+* `renderer.rs`: Generates BUILD files for each crate, as well as functions that can be called from BUILD files.
+
+The code started off as a very hacky Week of Code project, and there are some clear remnants of that in the codebase - nothing is sacred, feel free to improve anything!
+
+Some areas have unit testing, there are a few (very brittle) integration tests, and some examples.
+
+## How to test local changes
+
+To use a local version, first build it:
+```console
+resolver $ cargo build
+```
+
+Then run a bazel build with this environment variable:
+```console
+RULES_RUST_RESOLVER_URL_OVERRIDE=file:///path/to/resolver/target/debug/resolver bazel build //whatever
+```
+
+To get verbose logging, edit `workspace.bzl` to set `RUST_LOG` to `debug` or `trace` instead of `info`. In particular, that will print out the generated Cargo.toml, and the path to the generated workspace file.
+
+Note that you may need to `bazel shutdown` between bazel commands. Hopefully not, but if you're seeing stale results, try it out. This only affects local development.
+
+## Testing
+
+To test with the `resolver` built from source:
+
+```bash
+bin/test
+```
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new file mode 100644
index 0000000000..555c5b6cee
--- /dev/null
+++ b/cargo/crate_universe_resolver/Cargo.lock
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+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "winreg"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0120db82e8a1e0b9fb3345a539c478767c0048d842860994d96113d5b667bd69"
+dependencies = [
+ "winapi",
+]
diff --git a/cargo/crate_universe_resolver/Cargo.toml b/cargo/crate_universe_resolver/Cargo.toml
new file mode 100644
index 0000000000..67e152a99d
--- /dev/null
+++ b/cargo/crate_universe_resolver/Cargo.toml
@@ -0,0 +1,41 @@
+[package]
+name = "crate_universe_resolver"
+version = "0.2.0"
+authors = [
+  "Daniel Wagner-Hall <dwagnerhall@apple.com>",
+  "Romain Chossart <romainchossart@gmail.com>",
+  "Gibson Fahnestock <gib@apple.com>",
+]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+# Several of these dependencies need to be compatible with the version cargo-raze is using.
+
+anyhow = "1"
+cargo-raze = "0.9"
+cargo_metadata = "0.12.1"
+cfg-expr = "0.4.1"
+env_logger = "0.7"
+hex = "0.4"
+indoc = "1.0.2"
+itertools = "0.9"
+log = "0.4"
+semver = { version = "0.11", features = ["serde"] }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+sha2 = "0.9"
+structopt = "0.3"
+tempfile = "3"
+tera = "1.6"
+toml = "0.5.6"
+url = { version = "2.2", features = ["serde"] }
+uuid = { version = "0.8", features = ["v4"] }
+libssh2-sys = { version = "0.2.19", features = ["vendored-openssl"] }
+
+[dev-dependencies]
+assert_cmd = "1"
+maplit = "1"
+predicates = "1"
+spectral = "0.6"
diff --git a/cargo/crate_universe_resolver/src/config.rs b/cargo/crate_universe_resolver/src/config.rs
new file mode 100644
index 0000000000..b6c699e52c
--- /dev/null
+++ b/cargo/crate_universe_resolver/src/config.rs
@@ -0,0 +1,145 @@
+use std::collections::{BTreeMap, BTreeSet, HashMap};
+use std::path::PathBuf;
+
+use semver::VersionReq;
+use serde::{Deserialize, Serialize};
+use url::Url;
+
+use crate::consolidator::{ConsolidatorConfig, ConsolidatorOverride};
+use crate::parser::merge_cargo_tomls;
+use crate::renderer::RenderConfig;
+use crate::resolver::{Resolver, ResolverConfig};
+
+#[derive(Debug, Deserialize, Serialize, Ord, Eq, PartialOrd, PartialEq)]
+pub struct Package {
+    pub name: String,
+    pub semver: VersionReq,
+    pub features: Vec<String>,
+}
+
+#[derive(Debug, Deserialize, Serialize)]
+#[serde(deny_unknown_fields)]
+pub struct Override {
+    // Mapping of environment variables key -> value.
+    pub extra_rust_env_vars: BTreeMap<String, String>,
+    // Mapping of environment variables key -> value.
+    pub extra_build_script_env_vars: BTreeMap<String, String>,
+    // Mapping of target triple or spec -> extra bazel target dependencies.
+    pub extra_bazel_deps: BTreeMap<String, Vec<String>>,
+    // Mapping of target triple or spec -> extra bazel target data dependencies.
+    pub extra_bazel_data_deps: BTreeMap<String, Vec<String>>,
+    // Mapping of target triple or spec -> extra bazel target build script dependencies.
+    pub extra_build_script_bazel_deps: BTreeMap<String, Vec<String>>,
+    // Mapping of target triple or spec -> extra bazel target build script data dependencies.
+    pub extra_build_script_bazel_data_deps: BTreeMap<String, Vec<String>>,
+    // Features to remove from crates (e.g. which are needed when building with Cargo but not with Bazel).
+    pub features_to_remove: BTreeSet<String>,
+}
+
+// Options which affect the contents of the generated output should be on this struct.
+// These fields all end up hashed into the lockfile hash.
+//
+// Anything which doesn't affect the contents of the generated output should live on `Opt` in `main.rs`.
+#[derive(Debug, Deserialize, Serialize)]
+#[serde(deny_unknown_fields)]
+pub struct Config {
+    pub repository_name: String,
+
+    pub packages: Vec<Package>,
+    pub cargo_toml_files: BTreeMap<String, PathBuf>,
+    pub overrides: HashMap<String, Override>,
+
+    /// Template of the URL from which to download crates, which are assumed to be gzip'd tar files.
+    /// This string may contain arbitrarily many instances of {crate} and {version} which will be
+    /// replaced by crate names and versions.
+    #[serde(default = "default_repository_template")]
+    pub repository_template: String,
+
+    pub target_triples: Vec<String>,
+    pub cargo: PathBuf,
+
+    #[serde(default = "default_rules_rust_workspace_name")]
+    pub rust_rules_workspace_name: String,
+    #[serde(default = "default_index_url")]
+    pub index_url: Url,
+}
+
+impl Config {
+    pub fn preprocess(mut self) -> anyhow::Result<Resolver> {
+        self.packages.sort();
+
+        let (toml_contents, label_to_crates) =
+            merge_cargo_tomls(self.cargo_toml_files, self.packages)?;
+
+        let overrides = self
+            .overrides
+            .into_iter()
+            .map(|(krate, overryde)| {
+                (
+                    krate,
+                    ConsolidatorOverride {
+                        extra_rust_env_vars: overryde.extra_rust_env_vars,
+                        extra_build_script_env_vars: overryde.extra_build_script_env_vars,
+                        extra_bazel_deps: overryde.extra_bazel_deps,
+                        extra_build_script_bazel_deps: overryde.extra_build_script_bazel_deps,
+                        extra_bazel_data_deps: overryde.extra_bazel_data_deps,
+                        extra_build_script_bazel_data_deps: overryde
+                            .extra_build_script_bazel_data_deps,
+                        features_to_remove: overryde.features_to_remove,
+                    },
+                )
+            })
+            .collect();
+
+        Ok(Resolver::new(
+            toml_contents.into(),
+            ResolverConfig {
+                cargo: self.cargo,
+                index_url: self.index_url,
+            },
+            ConsolidatorConfig { overrides },
+            RenderConfig {
+                repo_rule_name: self.repository_name.clone(),
+                repository_template: self.repository_template.clone(),
+                rules_rust_workspace_name: self.rust_rules_workspace_name.clone(),
+            },
+            self.target_triples,
+            label_to_crates,
+        ))
+    }
+}
+
+// TODO: maybe remove the "+buildmetadata" suffix to consolidate e.g. "1.2.3+foo" and "1.2.3".
+/// Generate the repo rule name from the target like cargo-raze.
+/// e.g. `0.18.0-alpha.2+test` -> `0_18_0_alpha_2_test`.
+pub fn crate_to_repo_rule_name(repo_rule_name: &str, name: &str, version: &str) -> String {
+    format!(
+        "{repo_rule_name}__{name}__{version}",
+        repo_rule_name = repo_rule_name,
+        name = name.replace("-", "_"),
+        version = version
+            .replace(".", "_")
+            .replace("+", "_")
+            .replace("-", "_")
+    )
+}
+
+pub fn crate_to_label(repo_rule_name: &str, crate_name: &str, crate_version: &str) -> String {
+    format!(
+        "@{repo_name}//:{name}",
+        repo_name = crate_to_repo_rule_name(repo_rule_name, crate_name, crate_version),
+        name = crate_name.replace("-", "_")
+    )
+}
+
+pub fn default_rules_rust_workspace_name() -> String {
+    String::from("rules_rust")
+}
+
+pub fn default_index_url() -> Url {
+    Url::parse("https://github.com/rust-lang/crates.io-index").expect("Invalid default index URL")
+}
+
+fn default_repository_template() -> String {
+    String::from("https://crates.io/api/v1/crates/{crate}/{version}/download")
+}
diff --git a/cargo/crate_universe_resolver/src/consolidator.rs b/cargo/crate_universe_resolver/src/consolidator.rs
new file mode 100644
index 0000000000..6e14469667
--- /dev/null
+++ b/cargo/crate_universe_resolver/src/consolidator.rs
@@ -0,0 +1,259 @@
+use std::collections::{BTreeMap, BTreeSet};
+
+use anyhow::anyhow;
+use cargo_raze::context::{
+    BuildableDependency, CrateContext, CrateDependencyContext, CrateTargetedDepContext,
+};
+use itertools::Itertools;
+use semver::Version;
+
+use crate::renderer::{RenderConfig, Renderer};
+use crate::resolver::Dependencies;
+use cargo_raze::util::{generate_bazel_conditions, get_matching_bazel_triples};
+use cfg_expr::targets::get_builtin_target_by_triple;
+
+#[derive(Debug, Default)]
+pub struct ConsolidatorOverride {
+    // Mapping of environment variables key -> value.
+    pub extra_rust_env_vars: BTreeMap<String, String>,
+    // Mapping of environment variables key -> value.
+    pub extra_build_script_env_vars: BTreeMap<String, String>,
+    // Mapping of target triple or spec -> extra bazel target dependencies.
+    pub extra_bazel_deps: BTreeMap<String, Vec<String>>,
+    // Mapping of target triple or spec -> extra bazel target data dependencies.
+    pub extra_bazel_data_deps: BTreeMap<String, Vec<String>>,
+    // Mapping of target triple or spec -> extra bazel target build script dependencies.
+    pub extra_build_script_bazel_deps: BTreeMap<String, Vec<String>>,
+    // Mapping of target triple or spec -> extra bazel target build script data dependencies.
+    pub extra_build_script_bazel_data_deps: BTreeMap<String, Vec<String>>,
+
+    pub features_to_remove: BTreeSet<String>,
+}
+
+pub struct ConsolidatorConfig {
+    // Mapping of crate name to override struct.
+    pub overrides: BTreeMap<String, ConsolidatorOverride>,
+}
+
+pub struct Consolidator {
+    consolidator_config: ConsolidatorConfig,
+    render_config: RenderConfig,
+    digest: String,
+    target_triples: Vec<String>,
+    resolved_packages: Vec<CrateContext>,
+    member_packages_version_mapping: Dependencies,
+    label_to_crates: BTreeMap<String, BTreeSet<String>>,
+}
+
+impl Consolidator {
+    pub(crate) fn new(
+        consolidator_config: ConsolidatorConfig,
+        render_config: RenderConfig,
+        digest: String,
+        target_triples: Vec<String>,
+        resolved_packages: Vec<CrateContext>,
+        member_packages_version_mapping: Dependencies,
+        label_to_crates: BTreeMap<String, BTreeSet<String>>,
+    ) -> Self {
+        Consolidator {
+            consolidator_config,
+            render_config,
+            digest,
+            target_triples,
+            resolved_packages,
+            member_packages_version_mapping,
+            label_to_crates,
+        }
+    }
+
+    fn targeted_dep_context_for(
+        target: &str,
+        target_triples_filter: &[String],
+    ) -> CrateTargetedDepContext {
+        let triples: Vec<_> = {
+            if target.starts_with("cfg(") {
+                // User passed a cfg(...) configuration.
+                get_matching_bazel_triples(&target.to_owned())
+                    .unwrap_or_default()
+                    .into_iter()
+                    .filter(|target| target_triples_filter.contains(target))
+                    .collect()
+            } else {
+                // User passed a triple.
+                match get_builtin_target_by_triple(&target) {
+                    Some(_) => vec![target.to_owned()],
+                    _ => vec![],
+                }
+            }
+        };
+        if triples.is_empty() {
+            panic!(
+                "Target {} in rule attribute doesn't map to any triple",
+                &target
+            )
+        }
+
+        CrateTargetedDepContext {
+            target: target.to_owned(),
+            deps: CrateDependencyContext {
+                dependencies: vec![],
+                proc_macro_dependencies: vec![],
+                data_dependencies: vec![],
+                build_dependencies: vec![],
+                build_proc_macro_dependencies: vec![],
+                build_data_dependencies: vec![],
+                dev_dependencies: vec![],
+                aliased_dependencies: vec![],
+            },
+            conditions: generate_bazel_conditions("rules_rust", &triples).unwrap(), // UNWRAP: the triple was generated by get_matching_bazel_triples()
+        }
+    }
+
+    // Generate a Vec of CrateTargetedDepContext with the deps/data contents from the provided arguments.
+    fn extra_deps_as_targeted_deps<I>(
+        target_triples_filter: &[String],
+        extra_bazel_deps: I,
+        extra_bazel_data_deps: I,
+        extra_build_script_bazel_deps: I,
+        extra_build_script_bazel_data_deps: I,
+    ) -> Vec<CrateTargetedDepContext>
+    where
+        I: IntoIterator<Item = (String, Vec<String>)>,
+    {
+        let mut crate_targeted_dep_contexts: BTreeMap<String, CrateTargetedDepContext> =
+            Default::default();
+
+        let into_buildable_dependency = |dep: &String| BuildableDependency {
+            name: "".to_string(),
+            version: Version::new(0, 0, 0),
+            buildable_target: dep.clone(),
+            is_proc_macro: false,
+        };
+
+        extra_bazel_deps.into_iter().for_each(|(target, deps)| {
+            let targeted_dep_context = crate_targeted_dep_contexts
+                .entry(target.clone())
+                .or_insert_with(|| Self::targeted_dep_context_for(&target, target_triples_filter));
+            targeted_dep_context
+                .deps
+                .dependencies
+                .extend(deps.iter().map(into_buildable_dependency));
+        });
+        extra_bazel_data_deps
+            .into_iter()
+            .for_each(|(target, deps)| {
+                let targeted_dep_context = crate_targeted_dep_contexts
+                    .entry(target.clone())
+                    .or_insert_with(|| {
+                        Self::targeted_dep_context_for(&target, target_triples_filter)
+                    });
+                targeted_dep_context
+                    .deps
+                    .data_dependencies
+                    .extend(deps.iter().map(into_buildable_dependency));
+            });
+
+        extra_build_script_bazel_deps
+            .into_iter()
+            .for_each(|(target, deps)| {
+                let targeted_dep_context = crate_targeted_dep_contexts
+                    .entry(target.clone())
+                    .or_insert_with(|| {
+                        Self::targeted_dep_context_for(&target, target_triples_filter)
+                    });
+                targeted_dep_context
+                    .deps
+                    .build_dependencies
+                    .extend(deps.iter().map(into_buildable_dependency));
+            });
+
+        extra_build_script_bazel_data_deps
+            .into_iter()
+            .for_each(|(target, deps)| {
+                let targeted_dep_context = crate_targeted_dep_contexts
+                    .entry(target.clone())
+                    .or_insert_with(|| {
+                        Self::targeted_dep_context_for(&target, target_triples_filter)
+                    });
+                targeted_dep_context
+                    .deps
+                    .build_data_dependencies
+                    .extend(deps.iter().map(into_buildable_dependency));
+            });
+
+        crate_targeted_dep_contexts
+            .into_iter()
+            .sorted()
+            .map(|(_, targeted_dep_context)| targeted_dep_context)
+            .collect()
+    }
+
+    pub fn consolidate(self) -> anyhow::Result<Renderer> {
+        let Self {
+            mut consolidator_config,
+            render_config,
+            digest,
+            target_triples,
+            mut resolved_packages,
+            member_packages_version_mapping,
+            label_to_crates,
+        } = self;
+
+        let mut names_and_versions_to_count = BTreeMap::new();
+        for pkg in &resolved_packages {
+            *names_and_versions_to_count
+                .entry((pkg.pkg_name.clone(), pkg.pkg_version.clone()))
+                .or_insert(0_usize) += 1_usize;
+        }
+        let duplicates: Vec<_> = names_and_versions_to_count
+            .into_iter()
+            .filter_map(|((name, version), value)| {
+                if value > 1 {
+                    Some(format!("{} {}", name, version))
+                } else {
+                    None
+                }
+            })
+            .collect();
+        if !duplicates.is_empty() {
+            return Err(anyhow!(
+                "Got duplicate sources for identical crate name and version combination{}: {}",
+                if duplicates.len() == 1 { "" } else { "s" },
+                duplicates.join(", ")
+            ));
+        }
+
+        // Apply overrides specified in the crate_universe repo rule.
+        for pkg in &mut resolved_packages {
+            if let Some(overryde) = consolidator_config.overrides.remove(&pkg.pkg_name) {
+                // Add extra dependencies.
+                pkg.targeted_deps.extend(Self::extra_deps_as_targeted_deps(
+                    &target_triples,
+                    overryde.extra_bazel_deps.into_iter(),
+                    overryde.extra_bazel_data_deps.into_iter(),
+                    overryde.extra_build_script_bazel_deps.into_iter(),
+                    overryde.extra_build_script_bazel_data_deps.into_iter(),
+                ));
+                // Add extra environment variables.
+                pkg.raze_settings
+                    .additional_env
+                    .extend(overryde.extra_rust_env_vars.into_iter());
+                // Add extra build script environment variables.
+                pkg.raze_settings
+                    .buildrs_additional_environment_variables
+                    .extend(overryde.extra_build_script_env_vars.into_iter());
+
+                let features_to_remove = overryde.features_to_remove;
+                pkg.features.retain(|f| !features_to_remove.contains(f));
+            }
+        }
+
+        Ok(Renderer::new(
+            render_config,
+            digest,
+            resolved_packages,
+            member_packages_version_mapping,
+            label_to_crates,
+        ))
+    }
+}
diff --git a/cargo/crate_universe_resolver/src/lib.rs b/cargo/crate_universe_resolver/src/lib.rs
new file mode 100644
index 0000000000..f20b19eec1
--- /dev/null
+++ b/cargo/crate_universe_resolver/src/lib.rs
@@ -0,0 +1,25 @@
+use std::path::{Path, PathBuf};
+
+use std::io::Write;
+
+pub mod config;
+pub mod consolidator;
+pub mod parser;
+pub mod renderer;
+pub mod resolver;
+mod serde_utils;
+
+pub struct NamedTempFile(tempfile::TempDir, PathBuf);
+
+impl NamedTempFile {
+    pub fn with_str_content<P: AsRef<Path>>(name: P, content: &str) -> std::io::Result<Self> {
+        let dir = tempfile::tempdir()?;
+        let path = dir.path().join(name.as_ref());
+        let mut file = std::fs::File::create(&path)?;
+        write!(file, "{}", content)?;
+        Ok(Self(dir, path))
+    }
+    pub fn path(&self) -> &Path {
+        &self.1
+    }
+}
diff --git a/cargo/crate_universe_resolver/src/main.rs b/cargo/crate_universe_resolver/src/main.rs
new file mode 100644
index 0000000000..ed7107fce5
--- /dev/null
+++ b/cargo/crate_universe_resolver/src/main.rs
@@ -0,0 +1,111 @@
+use anyhow::{anyhow, Context};
+use log::*;
+use crate_universe_resolver::config::Config;
+use std::io::{BufRead, BufReader};
+use std::path::PathBuf;
+use structopt::StructOpt;
+
+// Options which don't affect the contents of the generated should be on this struct.
+// These fields are not factored into cache keys.
+//
+// Anything which affects the contents of the generated output should live on `config::Config`.
+#[derive(StructOpt)]
+struct Opt {
+    #[structopt(long)]
+    repo_name: String,
+    #[structopt(long = "input_path", parse(from_os_str))]
+    input_path: PathBuf,
+    #[structopt(long = "output_path", parse(from_os_str))]
+    output_path: PathBuf,
+    #[structopt(long = "lockfile", parse(from_os_str))]
+    lockfile: Option<PathBuf>,
+    #[structopt(long = "update-lockfile")]
+    update_lockfile: bool,
+}
+
+fn main() -> anyhow::Result<()> {
+    env_logger::init();
+
+    let opt = Opt::from_args();
+
+    trace!("Parsing config from {:?}", opt.input_path);
+
+    let config: Config = {
+        let config_file = std::fs::File::open(&opt.input_path)
+            .with_context(|| format!("Failed to open config file at {:?}", opt.input_path))?;
+        serde_json::from_reader(config_file)
+            .with_context(|| format!("Failed to parse config file {:?}", opt.input_path))?
+    };
+    let lockfile = opt.lockfile;
+    let repo_name = opt.repo_name;
+    let output_path = opt.output_path;
+
+    trace!("Preprocessing config");
+    let mut resolver = config.preprocess()?;
+
+    if opt.update_lockfile {
+        if lockfile.is_none() {
+            eprintln!("Not updating lockfile for `crate_universe` repository with name \"{}\" because it has no `lockfile` attribute.", repo_name);
+        }
+    } else if let Some(lockfile) = lockfile {
+        let mut lockfile_format_version_line = String::new();
+        let mut lockfile_hash_line = String::new();
+        {
+            std::fs::File::open(&lockfile)
+                .map(BufReader::new)
+                .and_then(|mut f| {
+                    f.read_line(&mut lockfile_format_version_line)?;
+                    f.read_line(&mut lockfile_hash_line)?;
+                    Ok(())
+                })
+                .with_context(|| format!("Failed to read lockfile header from {:?}", lockfile))?;
+        }
+        if lockfile_format_version_line != "# rules_rust crate_universe file format 1\n" {
+            return Err(anyhow!("Unrecognized lockfile format"));
+        }
+        if let Some(lockfile_hash) = lockfile_hash_line.strip_prefix("# config hash ") {
+            if resolver.digest()? == lockfile_hash.trim() {
+                std::fs::copy(&lockfile, &output_path).with_context(|| {
+                    format!(
+                        "Failed to copy lockfile from {:?} to {:?}",
+                        lockfile, output_path
+                    )
+                })?;
+                return Ok(());
+            } else {
+                return Err(anyhow!("rules_rust_external: Lockfile at {} is out of date, please either:\n1. Re-run bazel with the environment variable `RULES_RUST_UPDATE_CRATE_UNIVERSE_LOCKFILE=true`, to update the lockfile\n2. Remove the `lockfile` attribute from the `crate_universe` repository rule with name \"{}\" to use floating dependency versions", lockfile.display(), repo_name));
+            }
+        } else {
+            return Err(anyhow!("Invalid lockfile"));
+        }
+    }
+
+    // This will contain the mapping of the workspace member (i.e. toplevel) packages' direct
+    // dependencies package names to their package Bazel repository name (e.g. `bzip2 ->
+    // bzip2__0_3_3`), allowing the user to easily express dependencies with a `package()` macro
+    // without knowing the version in advance.
+    trace!("Resolving transitive dependencies");
+    let consolidator = resolver.resolve()?;
+    trace!("Consolidating overrides");
+    let renderer = consolidator.consolidate()?;
+
+    trace!("Rendering output to: {:?}", output_path);
+    let output_file = std::fs::File::create(&output_path)
+        .with_context(|| format!("Could not create output file {:?}", output_path))?;
+    renderer
+        .render(&output_file)
+        .context("Could not render deps")?;
+
+    if opt.update_lockfile {
+        if let Some(lockfile) = lockfile.as_ref() {
+            std::fs::copy(&output_path, lockfile).with_context(|| {
+                format!(
+                    "Error updating lockfile at {:?} from {:?}",
+                    lockfile, output_path
+                )
+            })?;
+        }
+    }
+
+    Ok(())
+}
diff --git a/cargo/crate_universe_resolver/src/parser.rs b/cargo/crate_universe_resolver/src/parser.rs
new file mode 100644
index 0000000000..6da290e5eb
--- /dev/null
+++ b/cargo/crate_universe_resolver/src/parser.rs
@@ -0,0 +1,388 @@
+use crate::config::Package as AdditionalPackage;
+use anyhow::{anyhow, Context};
+use indoc::indoc;
+use log::*;
+use semver::{Version, VersionReq};
+use serde::{Deserialize, Deserializer};
+use std::collections::{BTreeMap, BTreeSet};
+use std::convert::{TryFrom, TryInto};
+use std::fs::read_to_string;
+use std::path::PathBuf;
+use toml::Value;
+
+#[derive(Debug, Deserialize)]
+// We deny unknown fields so that when new fields are encountered, we need to explicitly decide
+// whether they affect dependency resolution or not.
+// For our first few users, this will be annoying, but it's hopefully worth it for the correctness.
+#[serde(deny_unknown_fields)]
+pub struct CargoToml {
+    pub package: Package,
+    pub dependencies: BTreeMap<String, DepSpec>,
+    #[serde(rename = "build-dependencies", default = "BTreeMap::new")]
+    pub build_dependencies: BTreeMap<String, DepSpec>,
+    #[serde(rename = "dev-dependencies", default = "BTreeMap::new")]
+    pub dev_dependencies: BTreeMap<String, DepSpec>,
+
+    #[serde(default = "BTreeMap::new")]
+    pub patch: BTreeMap<String, BTreeMap<String, DepSpec>>,
+
+    #[serde(flatten)]
+    _ignored: Option<Ignored>,
+}
+
+#[derive(Debug, Deserialize)]
+// Allows unknown fields - we assume everything in Package doesn't affect dependency resolution.
+pub struct Package {
+    pub name: String,
+    pub version: Version,
+}
+
+#[derive(Debug, PartialEq, Eq)]
+pub struct DepSpec {
+    pub default_features: bool,
+    pub features: BTreeSet<String>,
+    pub version: VersionSpec,
+}
+
+#[derive(Debug, PartialEq, Eq)]
+pub enum VersionSpec {
+    Semver(VersionReq),
+    Git {
+        url: String,
+        rev: Option<String>,
+        tag: Option<String>,
+    },
+    Local(PathBuf),
+}
+
+/// Fields in the top-level CargoToml which are ignored.
+/// Only add new fields here if you are certain they cannot affect dependency resolution.
+/// Cargo.toml docs: https://doc.rust-lang.org/cargo/reference/manifest.html
+#[derive(Debug, Deserialize)]
+struct Ignored {
+    // Target tables
+    lib: serde::de::IgnoredAny,
+    bin: serde::de::IgnoredAny,
+    example: serde::de::IgnoredAny,
+    test: serde::de::IgnoredAny,
+    bench: serde::de::IgnoredAny,
+    profile: serde::de::IgnoredAny,
+
+    // Other
+    features: serde::de::IgnoredAny,
+    badges: serde::de::IgnoredAny,
+    // Not ignored:
+    // replace: deprecated alternative to patch, use patch instead.
+    // cargo-features: unstable nightly features, evaluate on a case-by-case basis.
+    // workspace: TODO: support cargo workspaces.
+    // target: TODO: support platform-specific dependencies.
+}
+
+pub fn merge_cargo_tomls(
+    label_to_path: BTreeMap<String, PathBuf>,
+    packages: Vec<AdditionalPackage>,
+) -> anyhow::Result<(CargoToml, BTreeMap<String, BTreeSet<String>>)> {
+    let mut merged_cargo_toml: CargoToml = indoc! { r#"
+    [package]
+    name = "dummy_package_for_crate_universe_resolver"
+    version = "0.1.0"
+
+    [lib]
+    path = "doesnotexist.rs"
+
+    [dependencies]
+    "# }
+    .try_into()?;
+
+    let mut labels_to_deps = BTreeMap::new();
+
+    for (label, path) in label_to_path {
+        let mut all_dep_names = BTreeSet::new();
+
+        trace!("Parsing {:?}", path);
+        let content =
+            read_to_string(&path).with_context(|| format!("Failed to read {:?}", path))?;
+        let cargo_toml = CargoToml::try_from(content.as_str())
+            .with_context(|| format!("Error parsing {:?}", path))?;
+        let CargoToml {
+            dependencies,
+            build_dependencies,
+            dev_dependencies,
+            patch,
+            package: _,
+            _ignored,
+        } = cargo_toml;
+        for (dep, dep_spec) in dependencies.into_iter() {
+            if let VersionSpec::Local(_) = dep_spec.version {
+                // We ignore local deps.
+                debug!("Ignoring local path dependency on {:?}", path);
+                continue;
+            }
+            all_dep_names.insert(dep.clone());
+            if let Some(dep_spec_to_merge) = merged_cargo_toml.dependencies.get_mut(&dep) {
+                dep_spec_to_merge
+                    .merge(dep_spec)
+                    .context(format!("Failed to merge multiple dependencies on {}", dep))?;
+            } else {
+                merged_cargo_toml.dependencies.insert(dep, dep_spec);
+            }
+        }
+
+        for (dep, dep_spec) in build_dependencies.into_iter() {
+            if let VersionSpec::Local(_) = dep_spec.version {
+                // We ignore local deps.
+                debug!("Ignoring local path dependency on {:?}", path);
+                continue;
+            }
+            all_dep_names.insert(dep.clone());
+            if let Some(dep_spec_to_merge) = merged_cargo_toml.build_dependencies.get_mut(&dep) {
+                dep_spec_to_merge
+                    .merge(dep_spec)
+                    .context(format!("Failed to merge multiple dependencies on {}", dep))?;
+            } else {
+                merged_cargo_toml.build_dependencies.insert(dep, dep_spec);
+            }
+        }
+
+        for (dep, dep_spec) in dev_dependencies.into_iter() {
+            if let VersionSpec::Local(_) = dep_spec.version {
+                // We ignore local deps.
+                debug!("Ignoring local path dependency on {:?}", path);
+                continue;
+            }
+            all_dep_names.insert(dep.clone());
+            if let Some(dep_spec_to_merge) = merged_cargo_toml.dev_dependencies.get_mut(&dep) {
+                dep_spec_to_merge
+                    .merge(dep_spec)
+                    .context(format!("Failed to merge multiple dependencies on {}", dep))?;
+            } else {
+                merged_cargo_toml.dev_dependencies.insert(dep, dep_spec);
+            }
+        }
+
+        for (repo, deps) in patch {
+            if let Some(repo_map) = merged_cargo_toml.patch.get_mut(&repo) {
+                for (dep, dep_spec) in deps {
+                    if let Some(existing_dep_spec) = repo_map.get_mut(&dep) {
+                        existing_dep_spec.merge(dep_spec).context(format!(
+                            "Failed to merge multiple patches of {} in {}",
+                            dep, repo
+                        ))?;
+                    } else {
+                        repo_map.insert(dep, dep_spec);
+                    }
+                }
+            } else {
+                merged_cargo_toml.patch.insert(repo, deps);
+            }
+        }
+
+        labels_to_deps.insert(label.clone(), all_dep_names);
+    }
+
+    // Check for conflicts between packages in Cargo.toml and packages in crate_universe().
+    // TODO: only mark packages as conflicting if names are the same but versions are incompatible.
+    let cargo_toml_package_set: BTreeSet<_> =
+        merged_cargo_toml.dependencies.keys().cloned().collect();
+    let repo_rule_package_set: BTreeSet<_> = packages.iter().map(|p| p.name.clone()).collect();
+
+    let conflicting_pkgs: BTreeSet<_> = cargo_toml_package_set
+        .intersection(&repo_rule_package_set)
+        .collect();
+    if !conflicting_pkgs.is_empty() {
+        let conflicting_pkgs: Vec<_> = conflicting_pkgs.into_iter().cloned().collect();
+        // TODO: Mention which one, from labels_to_deps.
+        return Err(anyhow!("The following package{} provided both in a Cargo.toml and in the crate_universe repository rule: {}.", if conflicting_pkgs.len() == 1 { " was" } else { "s were" }, conflicting_pkgs.join(", ")));
+    }
+
+    for package in packages {
+        merged_cargo_toml.dependencies.insert(
+            package.name,
+            DepSpec {
+                default_features: true,
+                features: package.features.into_iter().collect(),
+                version: VersionSpec::Semver(package.semver),
+            },
+        );
+    }
+
+    Ok((merged_cargo_toml, labels_to_deps))
+}
+
+impl TryFrom<&str> for CargoToml {
+    type Error = anyhow::Error;
+
+    fn try_from(value: &str) -> Result<Self, Self::Error> {
+        Ok(toml::from_str(value)?)
+    }
+}
+
+impl From<CargoToml> for toml::Value {
+    fn from(cargo_toml: CargoToml) -> Value {
+        let CargoToml {
+            package,
+            dependencies,
+            build_dependencies,
+            dev_dependencies,
+            patch,
+            _ignored,
+        } = cargo_toml;
+
+        let mut v = toml::value::Table::new();
+
+        v.insert(String::from("package"), package.into());
+
+        v.insert(
+            String::from("lib"),
+            toml::Value::Table({
+                let mut table = toml::value::Table::new();
+                // cargo-metadata fails without this key.
+                table.insert(
+                    String::from("path"),
+                    toml::Value::String(String::from("doesnotexist.rs")),
+                );
+                table
+            }),
+        );
+
+        if !dependencies.is_empty() {
+            v.insert(
+                String::from("dependencies"),
+                table_of_dep_specs_to_toml(dependencies),
+            );
+        }
+        if !build_dependencies.is_empty() {
+            v.insert(
+                String::from("build-dependencies"),
+                table_of_dep_specs_to_toml(build_dependencies),
+            );
+        }
+        if !dev_dependencies.is_empty() {
+            v.insert(
+                String::from("dev-dependencies"),
+                table_of_dep_specs_to_toml(dev_dependencies),
+            );
+        }
+
+        if !patch.is_empty() {
+            v.insert(
+                String::from("patch"),
+                toml::Value::Table({
+                    let mut table = toml::value::Table::new();
+                    for (repo, patches) in patch {
+                        table.insert(repo, table_of_dep_specs_to_toml(patches));
+                    }
+                    table
+                }),
+            );
+        }
+
+        toml::Value::Table(v)
+    }
+}
+
+fn table_of_dep_specs_to_toml(table: BTreeMap<String, DepSpec>) -> toml::Value {
+    toml::Value::Table(
+        table
+            .into_iter()
+            .filter_map(|(dep_name, dep_spec)| {
+                dep_spec.to_cargo_toml_dep().map(|dep| (dep_name, dep))
+            })
+            .collect(),
+    )
+}
+
+impl From<Package> for toml::Value {
+    fn from(package: Package) -> Self {
+        let Package { name, version } = package;
+
+        let mut v = toml::value::Table::new();
+        v.insert(String::from("name"), toml::Value::String(name));
+        v.insert(
+            String::from("version"),
+            toml::Value::String(format!("{}", version)),
+        );
+
+        toml::Value::Table(v)
+    }
+}
+
+impl<'de> Deserialize<'de> for DepSpec {
+    fn deserialize<D>(deserializer: D) -> Result<Self, <D as Deserializer<'de>>::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        deserializer.deserialize_any(crate::serde_utils::DepSpecDeserializer)
+    }
+}
+
+impl DepSpec {
+    fn merge(&mut self, other: DepSpec) -> Result<(), anyhow::Error> {
+        self.default_features |= other.default_features;
+
+        self.features.extend(other.features.clone());
+
+        match (&mut self.version, &other.version) {
+            (v1, v2) if v1 == v2 => {}
+            (VersionSpec::Semver(v1), VersionSpec::Semver(v2)) => {
+                self.version = VersionSpec::Semver(VersionReq::parse(&format!("{}, {}", v1, v2))?)
+            }
+            (v1 @ VersionSpec::Git { .. }, v2 @ VersionSpec::Git { .. }) => {
+                return Err(anyhow!(
+                    "Can't merge different git versions of the same dependency (saw {:?} and {:?})",
+                    v1,
+                    v2
+                ))
+            }
+            (v1, v2) => {
+                return Err(anyhow!(
+                "Can't merge semver and git versions of the same dependency (saw: {:?} and {:?})",
+                v1,
+                v2
+            ))
+            }
+        }
+        Ok(())
+    }
+
+    fn to_cargo_toml_dep(self) -> Option<toml::Value> {
+        let Self {
+            default_features,
+            features,
+            version,
+        } = self;
+
+        let mut v = toml::value::Table::new();
+        v.insert(
+            String::from("default-features"),
+            toml::Value::Boolean(default_features),
+        );
+        v.insert(
+            String::from("features"),
+            toml::Value::Array(features.into_iter().map(toml::Value::String).collect()),
+        );
+        match version {
+            VersionSpec::Semver(version) => {
+                v.insert(
+                    String::from("version"),
+                    toml::Value::String(format!("{}", version)),
+                );
+            }
+            VersionSpec::Git { url, rev, tag } => {
+                v.insert(String::from("git"), toml::Value::String(url));
+                if let Some(rev) = rev {
+                    v.insert(String::from("rev"), toml::Value::String(rev));
+                }
+                if let Some(tag) = tag {
+                    v.insert(String::from("tag"), toml::Value::String(tag));
+                }
+            }
+            VersionSpec::Local(path) => {
+                eprintln!("Ignoring local path dependency on {:?}", path);
+                return None;
+            }
+        }
+
+        Some(toml::Value::Table(v))
+    }
+}
diff --git a/cargo/crate_universe_resolver/src/renderer.rs b/cargo/crate_universe_resolver/src/renderer.rs
new file mode 100644
index 0000000000..9f13555dcf
--- /dev/null
+++ b/cargo/crate_universe_resolver/src/renderer.rs
@@ -0,0 +1,476 @@
+use cargo_raze::context::{CrateContext, CrateDependencyContext, CrateTargetedDepContext};
+use semver::Version;
+use std::collections::{BTreeMap, BTreeSet, HashMap, HashSet};
+use std::fs::File;
+use std::io::Write;
+use tera::{self, Context, Tera};
+
+use crate::config;
+use crate::resolver::Dependencies;
+use std::path::Path;
+
+pub struct RenderConfig {
+    pub repo_rule_name: String,
+    pub repository_template: String,
+    pub rules_rust_workspace_name: String,
+}
+
+pub struct Renderer {
+    config: RenderConfig,
+    hash: String,
+    internal_renderer: Tera,
+    transitive_packages: Vec<CrateContext>,
+    member_packages_version_mapping: Dependencies,
+    label_to_crates: BTreeMap<String, BTreeSet<String>>,
+}
+
+// Get default and targeted metadata, collated per Bazel condition (which corresponds to a triple).
+// The default metadata is included in every triple.
+fn get_per_triple_metadata(package: &CrateContext) -> BTreeMap<String, CrateTargetedDepContext> {
+    let mut per_triple_metadata: BTreeMap<String, CrateTargetedDepContext> = BTreeMap::new();
+
+    // Always add a catch-all to cover the non-targeted dep case.
+    // We merge in the default_deps after the next loop.
+    per_triple_metadata.insert(
+        String::from("//conditions:default"),
+        CrateTargetedDepContext {
+            target: "Default".to_owned(),
+            deps: empty_deps_context(),
+            conditions: vec!["//conditions:default".to_owned()],
+        },
+    );
+
+    for dep_context in &package.targeted_deps {
+        dep_context.conditions.iter().for_each(|condition| {
+            let targeted_dep_ctx = per_triple_metadata.entry(condition.to_owned()).or_insert(
+                CrateTargetedDepContext {
+                    target: "".to_owned(),
+                    deps: empty_deps_context(),
+                    conditions: vec![condition.clone()],
+                },
+            );
+
+            // Mention all the targets that translated into the current condition (ie. current triplet).
+            targeted_dep_ctx
+                .target
+                .push_str(&format!(" {}", &dep_context.target));
+
+            targeted_dep_ctx
+                .deps
+                .dependencies
+                .extend(dep_context.deps.dependencies.iter().cloned());
+            targeted_dep_ctx
+                .deps
+                .proc_macro_dependencies
+                .extend(dep_context.deps.proc_macro_dependencies.iter().cloned());
+            targeted_dep_ctx
+                .deps
+                .data_dependencies
+                .extend(dep_context.deps.data_dependencies.iter().cloned());
+            targeted_dep_ctx
+                .deps
+                .build_dependencies
+                .extend(dep_context.deps.build_dependencies.iter().cloned());
+            targeted_dep_ctx.deps.build_proc_macro_dependencies.extend(
+                dep_context
+                    .deps
+                    .build_proc_macro_dependencies
+                    .iter()
+                    .cloned(),
+            );
+            targeted_dep_ctx
+                .deps
+                .build_data_dependencies
+                .extend(dep_context.deps.build_data_dependencies.iter().cloned());
+            targeted_dep_ctx
+                .deps
+                .dev_dependencies
+                .extend(dep_context.deps.dev_dependencies.iter().cloned());
+            targeted_dep_ctx
+                .deps
+                .aliased_dependencies
+                .extend(dep_context.deps.aliased_dependencies.iter().cloned());
+        });
+    }
+
+    // Now also add the non-targeted deps to each target.
+    for ctx in per_triple_metadata.values_mut() {
+        ctx.deps
+            .dependencies
+            .extend(package.default_deps.dependencies.iter().cloned());
+        ctx.deps
+            .proc_macro_dependencies
+            .extend(package.default_deps.proc_macro_dependencies.iter().cloned());
+        ctx.deps
+            .data_dependencies
+            .extend(package.default_deps.data_dependencies.iter().cloned());
+        ctx.deps
+            .build_dependencies
+            .extend(package.default_deps.build_dependencies.iter().cloned());
+        ctx.deps.build_proc_macro_dependencies.extend(
+            package
+                .default_deps
+                .build_proc_macro_dependencies
+                .iter()
+                .cloned(),
+        );
+        ctx.deps
+            .build_data_dependencies
+            .extend(package.default_deps.build_data_dependencies.iter().cloned());
+        ctx.deps
+            .dev_dependencies
+            .extend(package.default_deps.dev_dependencies.iter().cloned());
+        ctx.deps
+            .aliased_dependencies
+            .extend(package.default_deps.aliased_dependencies.iter().cloned());
+    }
+
+    per_triple_metadata
+}
+
+fn empty_deps_context() -> CrateDependencyContext {
+    CrateDependencyContext {
+        dependencies: vec![],
+        proc_macro_dependencies: vec![],
+        data_dependencies: vec![],
+        build_dependencies: vec![],
+        build_proc_macro_dependencies: vec![],
+        build_data_dependencies: vec![],
+        dev_dependencies: vec![],
+        aliased_dependencies: vec![],
+    }
+}
+
+impl Renderer {
+    pub fn new(
+        config: RenderConfig,
+        hash: String,
+        transitive_packages: Vec<CrateContext>,
+        member_packages_version_mapping: Dependencies,
+        label_to_crates: BTreeMap<String, BTreeSet<String>>,
+    ) -> Renderer {
+        let mut internal_renderer = Tera::new("src/not/a/dir/*").unwrap();
+        internal_renderer
+            .add_raw_templates(vec![
+                (
+                    "templates/partials/build_script.template",
+                    include_str!("templates/partials/build_script.template"),
+                ),
+                (
+                    "templates/partials/rust_binary.template",
+                    include_str!("templates/partials/rust_binary.template"),
+                ),
+                (
+                    "templates/partials/rust_library.template",
+                    include_str!("templates/partials/rust_library.template"),
+                ),
+                (
+                    "templates/partials/common_attrs.template",
+                    include_str!("templates/partials/common_attrs.template"),
+                ),
+                (
+                    "templates/crate.BUILD.template",
+                    include_str!("templates/crate.BUILD.template"),
+                ),
+                (
+                    "templates/partials/targeted_aliases.template",
+                    include_str!("templates/partials/targeted_aliases.template"),
+                ),
+                (
+                    "templates/partials/targeted_dependencies.template",
+                    include_str!("templates/partials/targeted_dependencies.template"),
+                ),
+                (
+                    "templates/partials/targeted_data_dependencies.template",
+                    include_str!("templates/partials/targeted_data_dependencies.template"),
+                ),
+                (
+                    "templates/partials/targeted_build_script_dependencies.template",
+                    include_str!("templates/partials/targeted_build_script_dependencies.template"),
+                ),
+                (
+                    "templates/partials/targeted_build_script_data_dependencies.template",
+                    include_str!(
+                        "templates/partials/targeted_build_script_data_dependencies.template"
+                    ),
+                ),
+                (
+                    "templates/partials/default_data_dependencies.template",
+                    include_str!("templates/partials/default_data_dependencies.template"),
+                ),
+            ])
+            .unwrap();
+
+        Self {
+            config,
+            hash,
+            internal_renderer,
+            transitive_packages,
+            member_packages_version_mapping,
+            label_to_crates,
+        }
+    }
+
+    pub fn render(&self, mut output_file: &File) -> anyhow::Result<()> {
+        let build_files = self
+            .transitive_packages
+            .iter()
+            .map(|package| {
+                let mut package = package;
+                let per_triple_metadata = get_per_triple_metadata(&package);
+
+                let mut backing_package;
+                if let Some(git_repo) = &package.source_details.git_data {
+                    if let Some(prefix_to_strip) = &git_repo.path_to_crate_root {
+                        backing_package = package.clone();
+                        for mut target in backing_package
+                            .targets
+                            .iter_mut()
+                            .chain(backing_package.build_script_target.iter_mut())
+                        {
+                            let path = Path::new(&target.path);
+                            let prefix_to_strip_path = Path::new(prefix_to_strip);
+                            target.path = path
+                                .strip_prefix(prefix_to_strip_path)
+                                .unwrap()
+                                .to_str()
+                                .unwrap()
+                                .to_owned();
+                        }
+
+                        package = &backing_package;
+                    }
+                }
+
+                let mut context = Context::new();
+                context.insert("crate", &package);
+                context.insert("targeted_metadata", &per_triple_metadata);
+                let rendered_crate_build_file = self
+                    .internal_renderer
+                    .render("templates/crate.BUILD.template", &context)?;
+                // TODO: Write test which has transitive deps on two proc-macro2 0.1.10 and 1.0.21 which differ in build-script-having-ness.
+                Ok((
+                    (package.pkg_name.clone(), package.pkg_version.clone()),
+                    rendered_crate_build_file,
+                ))
+            })
+            .collect::<Result<HashMap<_, _>, tera::Error>>()?;
+
+        write!(
+            output_file,
+            r#"# rules_rust crate_universe file format 1
+# config hash {hash}
+
+load("@bazel_tools//tools/build_defs/repo:git.bzl", "new_git_repository")
+
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+def pinned_rust_install():
+"#,
+            hash = self.hash,
+        )?;
+        for package in &self.transitive_packages {
+            let package_version = format!("{}", package.pkg_version);
+            if let Some(git_repo) = &package.source_details.git_data {
+                write!(
+                    output_file,
+                    r#"    new_git_repository(
+        name = "{repository_name}",
+        strip_prefix = "{strip_prefix}",
+        build_file_content = """{build_file_content}""",
+        remote = "{git_remote}",
+        # TODO: tag?
+        commit = "{git_commit}",
+    )
+
+"#,
+                    // TODO: Don't copy this implementation from workspace_path_and_default_target
+                    repository_name =
+                        config::crate_to_repo_rule_name(&self.config.repo_rule_name, &package.pkg_name, &package_version),
+                    build_file_content = build_files
+                        .get(&(package.pkg_name.clone(), package.pkg_version.clone()))
+                        .unwrap(),
+                    git_remote = git_repo.remote,
+                    git_commit = git_repo.commit,
+                    strip_prefix = git_repo.path_to_crate_root.clone().unwrap_or_default(),
+                )?;
+            } else {
+                write!(
+                    output_file,
+                    r#"    http_archive(
+        name = "{repository_name}",
+        # TODO: Allow configuring where rust_library comes from
+        build_file_content = """{build_file_content}""",{maybe_crate_sha256}
+        strip_prefix = "{name}-{version}",
+        type = "tar.gz",
+        url = "{url}",
+    )
+
+"#,
+                    // TODO: Don't copy this implementation from workspace_path_and_default_target
+                    repository_name =
+                        config::crate_to_repo_rule_name(&self.config.repo_rule_name, &package.pkg_name, &package_version),
+                    name = package.pkg_name,
+                    version = package.pkg_version,
+                    maybe_crate_sha256 = if let Some(crate_sha256) = &package.sha256 {
+                        format!("\n        sha256 = \"{}\",", crate_sha256)
+                    } else {
+                        String::new()
+                    },
+                    url = self
+                        .config
+                        .repository_template
+                        .replace("{crate}", &package.pkg_name)
+                        .replace("{version}", &package.pkg_version.to_string()),
+                    build_file_content = build_files
+                        .get(&(package.pkg_name.clone(), package.pkg_version.clone()))
+                        .unwrap(),
+                )?;
+            }
+        }
+
+        let (proc_macro_crates, default_crates): (Vec<_>, Vec<_>) = self
+            .member_packages_version_mapping
+            .normal
+            .iter()
+            .partition(|(name, version)| {
+                self.transitive_packages
+                    .iter()
+                    .find(|package| *package.pkg_name == **name && package.pkg_version == **version)
+                    // UNWRAP: cargo-metadata should ensure any package we're looking up is in the transitive packages.
+                    .unwrap()
+                    .targets
+                    .iter()
+                    .any(|target| target.kind == "proc-macro")
+            });
+
+        let mut crate_repo_names_inner = BTreeMap::new();
+        crate_repo_names_inner.extend(&self.member_packages_version_mapping.normal);
+        crate_repo_names_inner.extend(&self.member_packages_version_mapping.build);
+        crate_repo_names_inner.extend(&self.member_packages_version_mapping.dev);
+
+        // Now, create the crate() macro for the user.
+        write!(
+            output_file,
+            r##"
+CRATE_TARGET_NAMES = {{
+{crate_repo_names_inner}}}
+
+def crate(crate_name):
+    """Return the name of the target for the given crate.
+    """
+    target_name = CRATE_TARGET_NAMES.get(crate_name)
+    if target_name == None:
+        fail("Unknown crate name: {{}}".format(crate_name))
+    return target_name
+
+def all_deps():
+    """Return all standard dependencies explicitly listed in the Cargo.toml or packages list."""
+    return [
+        crate(crate_name) for crate_name in [{crate_names}
+        ]
+    ]
+
+def all_proc_macro_deps():
+    """Return all proc-macro dependencies explicitly listed in the Cargo.toml or packages list."""
+    return [
+        crate(crate_name) for crate_name in [{proc_macro_crate_names}
+        ]
+    ]
+
+def crates_from(label):
+    mapping = {{
+        {label_to_crates}
+    }}
+    return mapping[_absolutify(label)]
+
+def dev_crates_from(label):
+    mapping = {{
+        {label_to_dev_crates}
+    }}
+    return mapping[_absolutify(label)]
+
+def build_crates_from(label):
+    mapping = {{
+        {label_to_build_crates}
+    }}
+    return mapping[_absolutify(label)]
+
+def proc_macro_crates_from(label):
+    mapping = {{
+        {label_to_proc_macro_crates}
+    }}
+    return mapping[_absolutify(label)]
+
+def _absolutify(label):
+    if label.startswith("//") or label.startswith("@"):
+        return label
+    if label.startswith(":"):
+        return "//" + native.package_name() + label
+    return "//" + native.package_name() + ":" + label
+"##,
+            crate_repo_names_inner = crate_repo_names_inner
+                .iter()
+                .map(|(crate_name, crate_version)| format!(
+                    r#"    "{}": "{}",{newline}"#,
+                    crate_name,
+                    config::crate_to_label(&self.config.repo_rule_name, &crate_name, &crate_version.to_string()),
+                    newline = '\n',
+                ))
+                .collect::<Vec<String>>()
+                .join(""),
+            crate_names = default_crates
+                .iter()
+                .map(|(crate_name, _crate_version)| format!(
+                    r#"{newline}            "{}","#,
+                    crate_name,
+                    newline = '\n'
+                ))
+                .collect::<Vec<String>>()
+                .join(""),
+            proc_macro_crate_names = proc_macro_crates
+                .iter()
+                .map(|(crate_name, _crate_version)| format!(
+                    r#"{newline}            "{}","#,
+                    crate_name,
+                    newline = '\n'
+                ))
+                .collect::<Vec<String>>()
+                .join(""),
+            label_to_crates =
+                label_to_crates(&default_crates, &self.label_to_crates).join("\n    "),
+            label_to_dev_crates = label_to_crates(
+                &self.member_packages_version_mapping.dev.iter().collect(),
+                &self.label_to_crates,
+            )
+            .join("\n    "),
+            label_to_build_crates = label_to_crates(
+                &self.member_packages_version_mapping.build.iter().collect(),
+                &self.label_to_crates
+            )
+            .join("\n    "),
+            label_to_proc_macro_crates =
+                label_to_crates(&proc_macro_crates, &self.label_to_crates).join("\n    "),
+        )?;
+        Ok(())
+    }
+}
+
+fn label_to_crates(
+    crates: &Vec<(&String, &Version)>,
+    label_to_crates: &BTreeMap<String, BTreeSet<String>>,
+) -> Vec<String> {
+    let crate_names: HashSet<&String> = crates.iter().map(|(name, _)| *name).collect();
+    label_to_crates
+        .iter()
+        .map(|(label, all_crates)| {
+            let values = all_crates
+                .iter()
+                .filter(|crate_name| crate_names.contains(crate_name))
+                .map(|crate_name| format!(r#"crate("{}")"#, crate_name))
+                .collect::<Vec<_>>()
+                .join(", ");
+            format!(r#""{label}": [{values}],"#, label = label, values = values)
+        })
+        .collect::<Vec<_>>()
+}
diff --git a/cargo/crate_universe_resolver/src/resolver.rs b/cargo/crate_universe_resolver/src/resolver.rs
new file mode 100644
index 0000000000..27c292ddd5
--- /dev/null
+++ b/cargo/crate_universe_resolver/src/resolver.rs
@@ -0,0 +1,370 @@
+use std::borrow::Cow;
+use std::collections::{BTreeMap, BTreeSet, HashMap};
+use std::path::{Path, PathBuf};
+use std::process::Stdio;
+
+use cargo_metadata::{DependencyKind, Metadata, MetadataCommand};
+use cargo_raze::context::CrateContext;
+use cargo_raze::metadata::RazeMetadataFetcher;
+use cargo_raze::planning::{BuildPlanner, BuildPlannerImpl};
+use cargo_raze::settings::{GenMode, RazeSettings};
+use log::trace;
+use semver::{Version, VersionReq};
+use sha2::{Digest, Sha256};
+
+use crate::consolidator::{Consolidator, ConsolidatorConfig, ConsolidatorOverride};
+use crate::renderer::RenderConfig;
+use crate::NamedTempFile;
+use anyhow::Context;
+use url::Url;
+
+pub struct ResolverConfig {
+    pub cargo: PathBuf,
+    pub index_url: Url,
+}
+
+pub struct Resolver {
+    pub toml: toml::Value,
+    pub resolver_config: ResolverConfig,
+    pub consolidator_config: ConsolidatorConfig,
+    pub render_config: RenderConfig,
+    pub target_triples: Vec<String>,
+    pub label_to_crates: BTreeMap<String, BTreeSet<String>>,
+    digest: Option<String>,
+}
+
+// TODO: Interesting edge cases
+// - you can pass deps using: version number path on fs, git repo.
+// - you can rename crates you depend on.
+pub struct ResolvedArtifactsWithMetadata {
+    pub resolved_packages: Vec<CrateContext>,
+    pub member_packages_version_mapping: HashMap<String, Version>,
+}
+
+#[derive(Debug)]
+pub struct Dependencies {
+    pub normal: BTreeMap<String, Version>,
+    pub build: BTreeMap<String, Version>,
+    pub dev: BTreeMap<String, Version>,
+}
+
+impl Resolver {
+    pub fn new(
+        toml: toml::Value,
+        resolver_config: ResolverConfig,
+        consolidator_config: ConsolidatorConfig,
+        render_config: RenderConfig,
+        target_triples: Vec<String>,
+        label_to_crates: BTreeMap<String, BTreeSet<String>>,
+    ) -> Resolver {
+        Resolver {
+            toml,
+            resolver_config,
+            consolidator_config,
+            render_config,
+            target_triples,
+            label_to_crates,
+            digest: None,
+        }
+    }
+
+    pub fn digest(&mut self) -> anyhow::Result<String> {
+        // TODO: Ignore * .cargo config files outside of the workspace
+
+        if self.digest.is_none() {
+            // TODO: Combine values better
+            let mut hasher = Sha256::new();
+            // Mix in the version of this crate, which encompasses all logic and templates.
+            // This is probably a wild over-estimate of what should go in the cache key.
+            // NOTE: In debug mode, this mixes the digest of the executable, rather than the version number.
+            hasher.update(version_for_hashing()?);
+            hasher.update(b"\0");
+
+            // If new fields are added, you should decide whether they need hashing.
+            // Hint: They probably do. If not, please add a comment justifying why not.
+            let Self {
+                toml,
+                render_config:
+                    RenderConfig {
+                        repo_rule_name,
+                        repository_template,
+                        rules_rust_workspace_name,
+                    },
+                consolidator_config: ConsolidatorConfig { overrides },
+                resolver_config: ResolverConfig { cargo, index_url },
+
+                // This is what we're computing.
+                digest: _ignored,
+                target_triples,
+                label_to_crates,
+            } = &self;
+
+            hasher.update(repo_rule_name.as_str().as_bytes());
+            hasher.update(b"\0");
+            hasher.update(repository_template.as_str().as_bytes());
+            hasher.update(b"\0");
+            hasher.update(rules_rust_workspace_name.as_bytes());
+            hasher.update(b"\0");
+
+            hasher.update(get_cargo_version(&cargo)?);
+            hasher.update(b"\0");
+            hasher.update(index_url.as_str().as_bytes());
+            hasher.update(b"\0");
+            for target_triple in target_triples {
+                hasher.update(target_triple);
+                hasher.update(b"\0");
+            }
+            hasher.update(b"\0");
+            for (label, crates) in label_to_crates.iter() {
+                hasher.update(label.as_bytes());
+                hasher.update(b"\0");
+                for krate in crates.iter() {
+                    hasher.update(krate.as_bytes());
+                    hasher.update(b"\0");
+                }
+            }
+
+            // TODO: improve the caching by generating a lockfile over the resolve rather than over
+            // the render. If the digest contains only input for the cargo dependency resolution
+            // then we don't need to re-pin when making changes to things that only affect the
+            // generated bazel file.
+            for (
+                crate_name,
+                ConsolidatorOverride {
+                    extra_rust_env_vars,
+                    extra_build_script_env_vars,
+                    extra_bazel_deps,
+                    extra_bazel_data_deps,
+                    extra_build_script_bazel_deps,
+                    extra_build_script_bazel_data_deps,
+                    features_to_remove,
+                },
+            ) in overrides
+            {
+                hasher.update(crate_name);
+                hasher.update(b"\0");
+                for (env_key, env_val) in extra_rust_env_vars {
+                    hasher.update(env_key);
+                    hasher.update(b"\0");
+                    hasher.update(env_val);
+                    hasher.update(b"\0");
+                }
+                for (env_key, env_val) in extra_build_script_env_vars {
+                    hasher.update(env_key);
+                    hasher.update(b"\0");
+                    hasher.update(env_val);
+                    hasher.update(b"\0");
+                }
+                for dep_map in &[
+                    extra_bazel_deps,
+                    extra_bazel_data_deps,
+                    extra_build_script_bazel_deps,
+                    extra_build_script_bazel_data_deps,
+                ] {
+                    for (target, deps) in *dep_map {
+                        hasher.update(target);
+                        hasher.update(b"\0");
+                        for dep in deps {
+                            hasher.update(dep);
+                            hasher.update(b"\0");
+                        }
+                    }
+                }
+                for feature in features_to_remove {
+                    hasher.update(feature);
+                    hasher.update(b"\n");
+                }
+            }
+
+            for (env_name, env_value) in std::env::vars() {
+                // The CARGO_HOME variable changes where cargo writes and reads config, and caches.
+                // We currently use the user's Cargo home (by not overwriting it) so we should
+                // allow users to use a custom path to one.
+                if env_name == "CARGO_HOME" {
+                    continue;
+                }
+                // We hope that other env vars don't cause problems...
+                if env_name.starts_with("CARGO") && env_name != "CARGO_NET_GIT_FETCH_WITH_CLI" {
+                    eprintln!("Warning: You have the {} environment variable set - this may affect your crate_universe output", env_name);
+                    hasher.update(env_name);
+                    hasher.update(b"\0");
+                    hasher.update(env_value);
+                    hasher.update(b"\0");
+                }
+            }
+
+            hasher.update(toml.to_string().as_bytes());
+            hasher.update(b"\0");
+
+            // TODO: Include all files referenced by the toml.
+            self.digest = Some(hex::encode(hasher.finalize()));
+        }
+        // UNWRAP: Guaranteed by above code.
+        Ok(self.digest.clone().unwrap())
+    }
+
+    pub fn resolve(mut self) -> anyhow::Result<Consolidator> {
+        let toml_str = self.toml.to_string();
+        trace!("Resolving for generated Cargo.toml:\n{}", toml_str);
+        let merged_cargo_toml = NamedTempFile::with_str_content("Cargo.toml", &toml_str)
+            .context("Writing intermediate Cargo.toml")?;
+
+        // RazeMetadataFetcher only uses the scheme+host+port of this URL.
+        // If it used the path, we'd run into issues escaping the {s and }s from the template,
+        // but the scheme+host+port should be fine.
+        let repository_template_url = Url::parse(&self.render_config.repository_template)
+            .context("Parsing repository template URL")?;
+        let md_fetcher = RazeMetadataFetcher::new(
+            &self.resolver_config.cargo,
+            repository_template_url,
+            self.resolver_config.index_url.clone(),
+        );
+        let metadata = md_fetcher
+            .fetch_metadata(merged_cargo_toml.path().parent().unwrap(), None, None)
+            .context("Failed fetching metadata")?;
+
+        let raze_settings = RazeSettings {
+            gen_workspace_prefix: self.render_config.repo_rule_name.clone(),
+            genmode: GenMode::Remote,
+
+            // TODO: These are ?all ignored
+            workspace_path: "".to_string(),
+            package_aliases_dir: "".to_string(),
+            render_package_aliases: false,
+            target: None,
+            targets: Some(self.target_triples.clone()),
+            crates: HashMap::default(),
+            output_buildfile_suffix: "".to_string(),
+            default_gen_buildrs: true,
+            registry: self.render_config.repository_template.clone(),
+            binary_deps: HashMap::default(),
+            index_url: self.resolver_config.index_url.as_str().to_owned(),
+            rust_rules_workspace_name: self.render_config.rules_rust_workspace_name.clone(),
+            vendor_dir: "".to_string(),
+            experimental_api: false,
+        };
+
+        let planner = BuildPlannerImpl::new(metadata, raze_settings);
+
+        let planned_build = planner.plan_build(None).context("Failed planning build")?;
+
+        let mut resolved_packages = planned_build.crate_contexts;
+        resolved_packages
+            .sort_by(|l, r| (&l.pkg_name, &l.pkg_version).cmp(&(&r.pkg_name, &r.pkg_version)));
+
+        let member_packages_version_mapping =
+            self.get_member_packages_version_mapping(merged_cargo_toml.path(), &resolved_packages);
+
+        // TODO: generate a cargo toml from metadata in the bazel rule, when no cargo toml is present.
+
+        let digest = self.digest().context("Digesting Resolver inputs")?;
+        Ok(Consolidator::new(
+            self.consolidator_config,
+            self.render_config,
+            digest,
+            self.target_triples,
+            resolved_packages,
+            member_packages_version_mapping?,
+            self.label_to_crates,
+        ))
+    }
+
+    fn get_member_packages_version_mapping(
+        &self,
+        merged_cargo_toml: &Path,
+        resolved_artifacts: &[CrateContext],
+    ) -> anyhow::Result<Dependencies> {
+        let merged_cargo_metadata = MetadataCommand::new()
+            .cargo_path(&self.resolver_config.cargo)
+            .manifest_path(merged_cargo_toml)
+            .no_deps()
+            .exec()
+            .context("Failed to run cargo metadata")?;
+
+        Ok(Dependencies {
+            normal: Self::build_version_mapping_for_kind(
+                DependencyKind::Normal,
+                &merged_cargo_metadata,
+                resolved_artifacts,
+            ),
+            build: Self::build_version_mapping_for_kind(
+                DependencyKind::Build,
+                &merged_cargo_metadata,
+                resolved_artifacts,
+            ),
+            dev: Self::build_version_mapping_for_kind(
+                DependencyKind::Development,
+                &merged_cargo_metadata,
+                resolved_artifacts,
+            ),
+        })
+    }
+
+    fn build_version_mapping_for_kind(
+        kind: DependencyKind,
+        merged_cargo_metadata: &Metadata,
+        resolved_artifacts: &[CrateContext],
+    ) -> BTreeMap<String, Version> {
+        // Build the intersection of version requirements for all the member (i.e. toplevel) packages
+        // of our workspace.
+        let mut member_package_version_reqs: HashMap<String, Vec<VersionReq>> = Default::default();
+        for package in &merged_cargo_metadata.packages {
+            for dep in &package.dependencies {
+                if dep.kind == kind {
+                    member_package_version_reqs
+                        .entry(dep.name.clone())
+                        .or_default()
+                        .push(dep.req.clone());
+                }
+            }
+        }
+
+        let mut member_package_version_mapping = BTreeMap::new();
+        for package in resolved_artifacts {
+            // If the package name matches one of the member packages' direct dependencies, consider it
+            // for the final version: insert it into the map if we didn't have one yet, take the highest
+            // version so far if there was already one.
+            if let Some(version_req) = member_package_version_reqs.get(&package.pkg_name) {
+                if version_req
+                    .iter()
+                    .all(|req| req.matches(&package.pkg_version))
+                {
+                    let current_pkg_version = member_package_version_mapping
+                        .entry(package.pkg_name.clone())
+                        .or_insert_with(|| Version::new(0, 0, 0));
+                    if *current_pkg_version < package.pkg_version {
+                        *current_pkg_version = package.pkg_version.clone();
+                    }
+                }
+            }
+        }
+        member_package_version_mapping
+    }
+}
+
+fn get_cargo_version(cargo_path: &Path) -> anyhow::Result<Vec<u8>> {
+    let output = std::process::Command::new(cargo_path)
+        .arg("--version")
+        .stderr(Stdio::inherit())
+        .output()
+        .context("Invoking cargo --version")?;
+    if !output.status.success() {
+        panic!(
+            "TODO: cargo --version failed with exit code {:?}",
+            output.status.code()
+        );
+    }
+    Ok(output.stdout)
+}
+
+fn version_for_hashing() -> anyhow::Result<Cow<'static, [u8]>> {
+    if cfg!(debug_assertions) {
+        let current_exe =
+            std::env::current_exe().context("Couldn't get current executable path")?;
+        Ok(Cow::Owned(
+            std::fs::read(current_exe).context("Couldn't read current executable path")?,
+        ))
+    } else {
+        Ok(Cow::Borrowed(env!("CARGO_PKG_VERSION").as_bytes()))
+    }
+}
diff --git a/cargo/crate_universe_resolver/src/serde_utils.rs b/cargo/crate_universe_resolver/src/serde_utils.rs
new file mode 100644
index 0000000000..ceac87f3ed
--- /dev/null
+++ b/cargo/crate_universe_resolver/src/serde_utils.rs
@@ -0,0 +1,96 @@
+use crate::parser::{DepSpec, VersionSpec};
+use serde::de::{Error, MapAccess, Visitor};
+use serde::{de, Deserialize};
+use std::collections::BTreeSet;
+use std::fmt;
+use std::path::PathBuf;
+use std::str::FromStr;
+
+// Work around https://github.com/serde-rs/serde/issues/368
+const fn always_true() -> bool {
+    true
+}
+
+// See https://stackoverflow.com/questions/54761790/how-to-deserialize-with-for-a-container-using-serde-in-rust
+pub struct DepSpecDeserializer;
+
+#[derive(Debug, Default, Deserialize)]
+#[serde(deny_unknown_fields)]
+struct RawDepSpec {
+    #[serde(rename = "default-features", default = "always_true")]
+    default_features: bool,
+    #[serde(default = "BTreeSet::new")]
+    features: BTreeSet<String>,
+    version: Option<String>,
+    git: Option<String>,
+    rev: Option<String>,
+    tag: Option<String>,
+    path: Option<PathBuf>,
+
+    #[serde(skip_serializing)]
+    optional: Option<bool>,
+}
+
+impl FromStr for DepSpec {
+    type Err = semver::ReqParseError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let version = VersionSpec::Semver(semver::VersionReq::parse(s)?);
+        Ok(DepSpec {
+            version,
+            default_features: true,
+            features: BTreeSet::new(),
+        })
+    }
+}
+
+impl<'de> Visitor<'de> for DepSpecDeserializer {
+    type Value = DepSpec;
+
+    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        formatter.write_str("string or map")
+    }
+
+    fn visit_str<E>(self, value: &str) -> Result<Self::Value, E>
+    where
+        E: de::Error,
+    {
+        FromStr::from_str(value)
+            .map_err(|err| E::custom(format!("Error parsing string in Cargo.toml: {:?}", err)))
+    }
+
+    fn visit_map<M>(self, visitor: M) -> Result<Self::Value, M::Error>
+    where
+        M: MapAccess<'de>,
+    {
+        let copy: RawDepSpec =
+            Deserialize::deserialize(de::value::MapAccessDeserializer::new(visitor))?;
+
+        let RawDepSpec {
+            default_features,
+            features,
+            version,
+            git,
+            rev,
+            tag,
+            path,
+            // We always generate deps for optional deps.
+            optional: _,
+        } = copy;
+
+        let version = match (version, git, path, rev, tag) {
+            (Some(version), None, None, None, None) => {
+                VersionSpec::Semver(version.parse().map_err(M::Error::custom)?)
+            }
+            (None, Some(url), None, rev, tag) => VersionSpec::Git { url, rev, tag },
+            (None, None, Some(path), None, None) => VersionSpec::Local(path),
+            _ => return Err(M::Error::custom("Must set exactly one of version, git, or path, and may not specify git specifiers for non-git deps.")),
+        };
+
+        Ok(DepSpec {
+            default_features,
+            features,
+            version,
+        })
+    }
+}
diff --git a/cargo/crate_universe_resolver/src/templates/crate.BUILD.template b/cargo/crate_universe_resolver/src/templates/crate.BUILD.template
new file mode 100644
index 0000000000..c92b1f0859
--- /dev/null
+++ b/cargo/crate_universe_resolver/src/templates/crate.BUILD.template
@@ -0,0 +1,40 @@
+# buildifier: disable=load
+load(
+    "@rules_rust//rust:rust.bzl",
+    "rust_binary",
+    "rust_library",
+    "rust_test",
+)
+
+# buildifier: disable=load
+load("@bazel_skylib//lib:selects.bzl", "selects")
+
+package(default_visibility = [
+    "//visibility:public",
+])
+
+licenses([
+    "{{crate.license.rating}}",  # {{crate.license.name}}
+])
+
+# Generated targets
+{%- set crate_name_sanitized = crate.pkg_name | replace(from="-", to="_") %}
+{%- if crate.build_script_target %}
+{%      include "templates/partials/build_script.template" %}
+{%- endif %}
+{%- for target in crate.targets %}
+{%-     set target_name_sanitized = target.name | replace(from="-", to="_") %}
+{%-     if target.kind == "lib" %}
+{%          include "templates/partials/rust_library.template" %}
+{%-     elif target.kind == "bin" %}
+{%          include "templates/partials/rust_binary.template" %}
+{%-     elif target.kind == "proc-macro" %}
+{%          include "templates/partials/rust_library.template" %}
+{%-     elif target.kind == "dylib" %}
+{%          include "templates/partials/rust_library.template" %}
+{%-     elif target.kind == "rlib" %}
+{%          include "templates/partials/rust_library.template" %}
+{%-     else %}
+# Unsupported target "{{ target.name }}" with type "{{ target.kind }}" omitted
+{%-     endif %}
+{%- endfor %}
diff --git a/cargo/crate_universe_resolver/src/templates/partials/build_script.template b/cargo/crate_universe_resolver/src/templates/partials/build_script.template
new file mode 100644
index 0000000000..f3dc28ca10
--- /dev/null
+++ b/cargo/crate_universe_resolver/src/templates/partials/build_script.template
@@ -0,0 +1,60 @@
+# buildifier: disable=load-on-top
+load(
+    "@rules_rust//cargo:cargo_build_script.bzl",
+    "cargo_build_script",
+)
+
+# buildifier: leave-alone
+cargo_build_script(
+    name = "{{ crate_name_sanitized }}_build_script",
+    srcs = glob(["**/*.rs"]),
+    {%- if crate.build_script_target.path %}
+    crate_root = "{{ crate.build_script_target.path }}",
+    {%- else %}
+    crate_root = "build.rs",
+    {%- endif %}
+    edition = "{{ crate.edition }}",
+    deps = [
+      {%- for dependency in crate.default_deps.build_dependencies %}
+        "{{dependency.buildable_target}}",
+      {%- endfor %}
+    ]
+    {%- if crate.targeted_deps %}
+    {%- include "templates/partials/targeted_build_script_dependencies.template" -%},
+    {%- else -%},
+    {%- endif %}
+    {%- if crate.default_deps.build_proc_macro_dependencies %}
+    proc_macro_deps = [
+    {%- for dependency in crate.default_deps.build_proc_macro_dependencies %}
+        "{{dependency.buildable_target}}",
+    {%- endfor %}
+    ],
+    {%- endif %}
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    crate_features = [
+      {%- for feature in crate.features %}
+      "{{feature}}",
+      {%- endfor %}
+    ],
+    build_script_env = {
+        {%- for key, value in crate.raze_settings.buildrs_additional_environment_variables %}
+        "{{key}}": "{{value}}",
+        {%- endfor %}
+    },
+    {%- if crate.links %}
+    links = "{{ crate.links }}",
+    {%- endif %}
+    data = {% include "templates/partials/default_data_dependencies.template" -%}
+    {%- if crate.targeted_deps %}
+    {%- include "templates/partials/targeted_build_script_data_dependencies.template" -%},
+    {%- else -%},
+    {%- endif %}
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    version = "{{ crate.pkg_version }}",
+    visibility = ["//visibility:private"],
+)
diff --git a/cargo/crate_universe_resolver/src/templates/partials/common_attrs.template b/cargo/crate_universe_resolver/src/templates/partials/common_attrs.template
new file mode 100644
index 0000000000..d170599f50
--- /dev/null
+++ b/cargo/crate_universe_resolver/src/templates/partials/common_attrs.template
@@ -0,0 +1,41 @@
+    srcs = glob(["**/*.rs"]),
+    crate_root = "{{ target.path }}",
+    edition = "{{ target.edition }}",
+    {%- if crate.default_deps.proc_macro_dependencies %}
+    proc_macro_deps = [
+    {%- for dependency in crate.default_deps.proc_macro_dependencies %}
+        "{{dependency.buildable_target}}",
+    {%- endfor %}
+    ],
+    {%- endif %}
+    rustc_flags = [
+        "--cap-lints=allow",
+        {%- for flag in crate.raze_settings.additional_flags %}
+        "{{flag}}",
+        {%- endfor %}
+    ],
+    {%- if crate.raze_settings.additional_env %}
+    rustc_env = {
+        {%- for key, value in crate.raze_settings.additional_env %}
+        "{{key}}": "{{value}}",
+        {%- endfor %}
+    },
+    {%- endif %}
+    data = {% include "templates/partials/default_data_dependencies.template" -%}
+    {%- if crate.raze_settings.data_attr -%} + {{crate.raze_settings.data_attr}}
+    {%- endif %}
+    {%- if crate.targeted_deps %}
+    {%- include "templates/partials/targeted_data_dependencies.template" %},
+    {%- else %},
+    {%- endif %}
+    version = "{{ crate.pkg_version }}",
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    crate_features = [
+        {%- for feature in crate.features %}
+        "{{feature}}",
+        {%- endfor %}
+    ],
+    aliases = {%- include "templates/partials/targeted_aliases.template" %},
\ No newline at end of file
diff --git a/cargo/crate_universe_resolver/src/templates/partials/default_data_dependencies.template b/cargo/crate_universe_resolver/src/templates/partials/default_data_dependencies.template
new file mode 100644
index 0000000000..5f75b893fe
--- /dev/null
+++ b/cargo/crate_universe_resolver/src/templates/partials/default_data_dependencies.template
@@ -0,0 +1,12 @@
+glob(["**"], exclude=[
+        # These can be manually added with overrides if needed.
+
+        # If you run `cargo build` in this dir, the target dir can get very big very quick.
+        "target/**",
+
+        # These are not vendored from the crate - we exclude them to avoid busting caches
+        # when we change how we generate BUILD files and such.
+        "BUILD.bazel",
+        "WORKSPACE.bazel",
+        "WORKSPACE",
+    ])
\ No newline at end of file
diff --git a/cargo/crate_universe_resolver/src/templates/partials/rust_binary.template b/cargo/crate_universe_resolver/src/templates/partials/rust_binary.template
new file mode 100644
index 0000000000..2a0a4009c3
--- /dev/null
+++ b/cargo/crate_universe_resolver/src/templates/partials/rust_binary.template
@@ -0,0 +1,27 @@
+
+# buildifier: leave-alone
+rust_binary(
+    # Prefix bin name to disambiguate from (probable) collision with lib name
+    # N.B.: The exact form of this is subject to change.
+    name = "cargo_bin_{{ target_name_sanitized }}",
+    deps = [
+        {%- if crate.lib_target_name %}
+        # Binaries get an implicit dependency on their crate's lib
+        ":{{crate.lib_target_name | replace(from="-", to="_") }}",
+        {%- endif %}
+        {%- if crate.build_script_target %}
+        ":{{ crate_name_sanitized }}_build_script",
+        {%- endif %}
+        {%- for dependency in crate.default_deps.dependencies %}
+        "{{dependency.buildable_target}}",
+        {%- endfor %}
+        {%- for dependency in crate.raze_settings.additional_deps %}
+        "{{dependency}}",
+        {%- endfor %}
+    ]
+    {%- if crate.targeted_deps %} 
+    {%- include "templates/partials/targeted_dependencies.template" -%},
+    {%- else -%},
+    {%- endif %}
+{% include "templates/partials/common_attrs.template" %}
+)
\ No newline at end of file
diff --git a/cargo/crate_universe_resolver/src/templates/partials/rust_library.template b/cargo/crate_universe_resolver/src/templates/partials/rust_library.template
new file mode 100644
index 0000000000..0e06764222
--- /dev/null
+++ b/cargo/crate_universe_resolver/src/templates/partials/rust_library.template
@@ -0,0 +1,33 @@
+
+{% if target_name_sanitized != crate_name_sanitized -%}
+alias(
+    name = "{{ crate_name_sanitized }}",
+    actual = ":{{ target_name_sanitized }}",
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+)
+
+{% endif -%}
+# buildifier: leave-alone
+rust_library(
+    name = "{{ target_name_sanitized }}",
+    crate_type = "{{ target.kind }}",
+    deps = [
+        {%- if crate.build_script_target %}
+        ":{{ crate_name_sanitized }}_build_script",
+        {%- endif %}
+        {%- for dependency in crate.default_deps.dependencies %}
+        "{{dependency.buildable_target}}",
+        {%- endfor %}
+        {%- for dependency in crate.raze_settings.additional_deps %}
+        "{{dependency}}",
+        {%- endfor %}
+    ]
+    {%- if crate.targeted_deps %}
+    {%- include "templates/partials/targeted_dependencies.template" -%},
+    {%- else -%},
+    {%- endif %}
+{% include "templates/partials/common_attrs.template" %}
+)
\ No newline at end of file
diff --git a/cargo/crate_universe_resolver/src/templates/partials/targeted_aliases.template b/cargo/crate_universe_resolver/src/templates/partials/targeted_aliases.template
new file mode 100644
index 0000000000..99b4487f33
--- /dev/null
+++ b/cargo/crate_universe_resolver/src/templates/partials/targeted_aliases.template
@@ -0,0 +1,10 @@
+ select({
+{%- for condition, targeted_dep in targeted_metadata %}
+        # {{ targeted_dep.target }}
+        "{{ condition }}": {
+            {%- for alias in targeted_dep.deps.aliased_dependencies %}
+            "{{alias.target}}": "{{alias.alias}}",
+            {%- endfor %}
+        },
+{%- endfor %}
+    })
\ No newline at end of file
diff --git a/cargo/crate_universe_resolver/src/templates/partials/targeted_build_script_data_dependencies.template b/cargo/crate_universe_resolver/src/templates/partials/targeted_build_script_data_dependencies.template
new file mode 100644
index 0000000000..a73b7d004c
--- /dev/null
+++ b/cargo/crate_universe_resolver/src/templates/partials/targeted_build_script_data_dependencies.template
@@ -0,0 +1,17 @@
+{%- for targeted_dep in crate.targeted_deps %}
+{%- if targeted_dep.deps.build_data_dependencies | length == 0 %}
+{%- continue %}
+{%- endif %} + selects.with_or({
+        # {{ targeted_dep.target }}
+        (
+{%- for condition in targeted_dep.conditions %}
+            "{{ condition }}",
+{%- endfor %}
+        ): [
+{%- for dependency in targeted_dep.deps.build_data_dependencies %}
+            "{{ dependency.buildable_target }}",
+{%- endfor %}
+        ],
+        "//conditions:default": [],
+    })
+{%- endfor -%}
\ No newline at end of file
diff --git a/cargo/crate_universe_resolver/src/templates/partials/targeted_build_script_dependencies.template b/cargo/crate_universe_resolver/src/templates/partials/targeted_build_script_dependencies.template
new file mode 100644
index 0000000000..c248d5ce22
--- /dev/null
+++ b/cargo/crate_universe_resolver/src/templates/partials/targeted_build_script_dependencies.template
@@ -0,0 +1,17 @@
+{%- for targeted_dep in crate.targeted_deps %}
+{%- if targeted_dep.deps.build_dependencies | length == 0 %}
+{%- continue %}
+{%- endif %} + selects.with_or({
+        # {{ targeted_dep.target }}
+        (
+{%- for condition in targeted_dep.conditions %}
+            "{{ condition }}",
+{%- endfor %}
+        ): [
+{%- for dependency in targeted_dep.deps.build_dependencies %}
+            "{{ dependency.buildable_target }}",
+{%- endfor %}
+        ],
+        "//conditions:default": [],
+    })
+{%- endfor -%}
\ No newline at end of file
diff --git a/cargo/crate_universe_resolver/src/templates/partials/targeted_data_dependencies.template b/cargo/crate_universe_resolver/src/templates/partials/targeted_data_dependencies.template
new file mode 100644
index 0000000000..8b06d00fc7
--- /dev/null
+++ b/cargo/crate_universe_resolver/src/templates/partials/targeted_data_dependencies.template
@@ -0,0 +1,17 @@
+{%- for targeted_dep in crate.targeted_deps %}
+{%- if targeted_dep.deps.data_dependencies | length == 0 %}
+{%- continue %}
+{%- endif %} + selects.with_or({
+        # {{ targeted_dep.target }}
+        (
+{%- for condition in targeted_dep.conditions %}
+            "{{ condition }}",
+{%- endfor %}
+        ): [
+{%- for dependency in targeted_dep.deps.data_dependencies %}
+            "{{ dependency.buildable_target }}",
+{%- endfor %}
+        ],
+        "//conditions:default": [],
+    })
+{%- endfor -%}
\ No newline at end of file
diff --git a/cargo/crate_universe_resolver/src/templates/partials/targeted_dependencies.template b/cargo/crate_universe_resolver/src/templates/partials/targeted_dependencies.template
new file mode 100644
index 0000000000..aae7226eff
--- /dev/null
+++ b/cargo/crate_universe_resolver/src/templates/partials/targeted_dependencies.template
@@ -0,0 +1,17 @@
+{%- for targeted_dep in crate.targeted_deps %}
+{%- if targeted_dep.deps.dependencies | length == 0 %}
+{%- continue %}
+{%- endif %} + selects.with_or({
+        # {{ targeted_dep.target }}
+        (
+{%- for condition in targeted_dep.conditions %}
+            "{{ condition }}",
+{%- endfor %}
+        ): [
+{%- for dependency in targeted_dep.deps.dependencies %}
+            "{{ dependency.buildable_target }}",
+{%- endfor %}
+        ],
+        "//conditions:default": [],
+    })
+{%- endfor -%}
\ No newline at end of file
diff --git a/cargo/crate_universe_resolver/tests/integration.rs b/cargo/crate_universe_resolver/tests/integration.rs
new file mode 100644
index 0000000000..a80636285b
--- /dev/null
+++ b/cargo/crate_universe_resolver/tests/integration.rs
@@ -0,0 +1,2048 @@
+use std::collections::{BTreeMap, BTreeSet, HashMap};
+use std::fs::create_dir_all;
+use std::path::PathBuf;
+
+use assert_cmd::assert::Assert;
+use assert_cmd::Command;
+use maplit::btreemap;
+use predicates::boolean::PredicateBooleanExt;
+use predicates::ord::eq;
+use semver::VersionReq;
+
+use crate_universe_resolver::config::{Config, Override, Package};
+use crate_universe_resolver::NamedTempFile;
+
+#[test]
+fn basic() {
+    let cargo_toml_file = NamedTempFile::with_str_content(
+        "Cargo.toml",
+        r#"[package]
+name = "basic"
+version = "0.1.0"
+edition = "2018"
+
+[dependencies]
+lazy_static = "=1.4.0"
+"#,
+    )
+    .expect("Error making temporary file");
+
+    let config = Config {
+        repository_name: "beep".to_owned(),
+        cargo_toml_files: btreemap! { String::from("//some:Cargo.toml") => cargo_toml_file.path().to_path_buf() },
+        overrides: Default::default(),
+        repository_template: "https://crates-io.s3-us-west-1.amazonaws.com/crates/crates/{crate}/{crate}-{version}.crate".to_owned(),
+        target_triples: vec!["x86_64-apple-darwin".to_owned()],
+        packages: vec![],
+        cargo: PathBuf::from(env!("CARGO")),
+        rust_rules_workspace_name: crate_universe_resolver::config::default_rules_rust_workspace_name(),
+        index_url: crate_universe_resolver::config::default_index_url(),
+    };
+
+    let want_output = r##"
+load("@bazel_tools//tools/build_defs/repo:git.bzl", "new_git_repository")
+
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+def pinned_rust_install():
+    http_archive(
+        name = "beep__lazy_static__1_4_0",
+        # TODO: Allow configuring where rust_library comes from
+        build_file_content = """# buildifier: disable=load
+load(
+    "@rules_rust//rust:rust.bzl",
+    "rust_binary",
+    "rust_library",
+    "rust_test",
+)
+
+# buildifier: disable=load
+load("@bazel_skylib//lib:selects.bzl", "selects")
+
+package(default_visibility = [
+    "//visibility:public",
+])
+
+licenses([
+    "notice",  # MIT from expression "MIT OR Apache-2.0"
+])
+
+# Generated targets
+
+# buildifier: leave-alone
+rust_library(
+    name = "lazy_static",
+    crate_type = "lib",
+    deps = [
+    ],
+    srcs = glob(["**/*.rs"]),
+    crate_root = "src/lib.rs",
+    edition = "2015",
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    data = glob(["**"], exclude=[
+        # These can be manually added with overrides if needed.
+
+        # If you run `cargo build` in this dir, the target dir can get very big very quick.
+        "target/**",
+
+        # These are not vendored from the crate - we exclude them to avoid busting caches
+        # when we change how we generate BUILD files and such.
+        "BUILD.bazel",
+        "WORKSPACE.bazel",
+        "WORKSPACE",
+    ]),
+    version = "1.4.0",
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    crate_features = [
+    ],
+    aliases = select({
+        # Default
+        "//conditions:default": {
+        },
+    }),
+)
+# Unsupported target "no_std" with type "test" omitted
+# Unsupported target "test" with type "test" omitted
+""",
+        sha256 = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646",
+        strip_prefix = "lazy_static-1.4.0",
+        type = "tar.gz",
+        url = "https://crates-io.s3-us-west-1.amazonaws.com/crates/crates/lazy_static/lazy_static-1.4.0.crate",
+    )
+
+
+CRATE_TARGET_NAMES = {
+    "lazy_static": "@beep__lazy_static__1_4_0//:lazy_static",
+}
+
+def crate(crate_name):
+    """Return the name of the target for the given crate.
+    """
+    target_name = CRATE_TARGET_NAMES.get(crate_name)
+    if target_name == None:
+        fail("Unknown crate name: {}".format(crate_name))
+    return target_name
+
+def all_deps():
+    """Return all standard dependencies explicitly listed in the Cargo.toml or packages list."""
+    return [
+        crate(crate_name) for crate_name in [
+            "lazy_static",
+        ]
+    ]
+
+def all_proc_macro_deps():
+    """Return all proc-macro dependencies explicitly listed in the Cargo.toml or packages list."""
+    return [
+        crate(crate_name) for crate_name in [
+        ]
+    ]
+
+def crates_from(label):
+    mapping = {
+        "//some:Cargo.toml": [crate("lazy_static")],
+    }
+    return mapping[_absolutify(label)]
+
+def dev_crates_from(label):
+    mapping = {
+        "//some:Cargo.toml": [],
+    }
+    return mapping[_absolutify(label)]
+
+def build_crates_from(label):
+    mapping = {
+        "//some:Cargo.toml": [],
+    }
+    return mapping[_absolutify(label)]
+
+def proc_macro_crates_from(label):
+    mapping = {
+        "//some:Cargo.toml": [],
+    }
+    return mapping[_absolutify(label)]
+
+def _absolutify(label):
+    if label.startswith("//") or label.startswith("@"):
+        return label
+    if label.startswith(":"):
+        return "//" + native.package_name() + label
+    return "//" + native.package_name() + ":" + label
+"##;
+
+    // Ignore header which contains a hash
+    test(&config)
+        .success()
+        .stdout(predicates::str::ends_with(want_output));
+}
+
+#[test]
+fn intermediate() {
+    let cargo_toml_file = NamedTempFile::with_str_content(
+        "Cargo.toml",
+        r#"[package]
+name = "intermediate"
+version = "0.1.0"
+edition = "2018"
+
+# TODO: support lockfile instead of passing the transitive pinned list as "packages" directly.
+[dependencies]
+lazy_static = "=1.4.0"
+bytes = "=0.5.6"
+pin-project-lite = "=0.1.7"
+bitflags = "=1.2.1"
+
+# System dependency (libz-sys) and its transitive deps.
+libz-sys = "=1.1.2"
+cc = "=1.0.62"
+libc = "=0.2.80"
+pkg-config = "=0.3.19"
+vcpkg = "=0.2.10"
+
+# TODO: do not depend on this section to be present rules_rust_external.
+[[bin]]
+name = "basic"
+path = "src/main.rs"
+"#,
+    )
+    .expect("Error making temporary file");
+
+    let mut tokio_extra_rust_env_vars = BTreeMap::<String, String>::new();
+    tokio_extra_rust_env_vars.insert("ENV_VAR_1".to_owned(), "value1".to_owned());
+    tokio_extra_rust_env_vars.insert("ENV_VAR_2".to_owned(), "value2".to_owned());
+
+    let mut tokio_extra_bazel_deps = BTreeMap::<String, Vec<String>>::new();
+    tokio_extra_bazel_deps.insert(
+        "x86_64-apple-darwin".to_owned(),
+        vec!["@some//:dep".to_owned(), "@other//:dep".to_owned()],
+    );
+    tokio_extra_bazel_deps.insert("cfg(unix)".to_owned(), vec!["@yetanother//:dep".to_owned()]);
+
+    let mut bitflags_extra_build_script_env_vars = BTreeMap::<String, String>::new();
+    bitflags_extra_build_script_env_vars
+        .insert("BUILD_SCRIPT_ENV_VAR".to_owned(), "value".to_owned());
+
+    let mut bitflags_extra_bazel_builds_script_deps = BTreeMap::<String, Vec<String>>::new();
+    bitflags_extra_bazel_builds_script_deps.insert(
+        "x86_64-unknown-linux-gnu".to_owned(),
+        vec!["@buildscriptdep//:dep".to_owned()],
+    );
+
+    let mut bitflags_extra_bazel_builds_script_data_deps = BTreeMap::<String, Vec<String>>::new();
+    bitflags_extra_bazel_builds_script_data_deps.insert(
+        "x86_64-unknown-linux-gnu".to_owned(),
+        vec!["@buildscriptdep//:somedata".to_owned()],
+    );
+
+    let mut lazy_static_extra_bazel_deps = BTreeMap::<String, Vec<String>>::new();
+    lazy_static_extra_bazel_deps.insert("cfg(all())".to_owned(), vec!["@such//:dep".to_owned()]);
+
+    let mut lazy_static_extra_bazel_data_deps = BTreeMap::<String, Vec<String>>::new();
+    lazy_static_extra_bazel_data_deps.insert(
+        "x86_64-unknown-linux-gnu".to_owned(),
+        vec!["@such//:somedata".to_owned()],
+    );
+
+    let mut overrides = HashMap::new();
+    overrides.insert(
+        "tokio".into(),
+        Override {
+            extra_rust_env_vars: tokio_extra_rust_env_vars,
+            extra_build_script_env_vars: Default::default(),
+            extra_bazel_deps: tokio_extra_bazel_deps,
+            extra_build_script_bazel_deps: Default::default(),
+            extra_bazel_data_deps: Default::default(),
+            extra_build_script_bazel_data_deps: Default::default(),
+            features_to_remove: BTreeSet::new(),
+        },
+    );
+    overrides.insert(
+        "lazy_static".into(),
+        Override {
+            extra_rust_env_vars: Default::default(),
+            extra_build_script_env_vars: Default::default(),
+            extra_bazel_deps: lazy_static_extra_bazel_deps,
+            extra_build_script_bazel_deps: Default::default(),
+            extra_bazel_data_deps: lazy_static_extra_bazel_data_deps,
+            extra_build_script_bazel_data_deps: Default::default(),
+            features_to_remove: BTreeSet::new(),
+        },
+    );
+    overrides.insert(
+        "bitflags".into(),
+        Override {
+            extra_rust_env_vars: Default::default(),
+            extra_build_script_env_vars: bitflags_extra_build_script_env_vars,
+            extra_bazel_deps: Default::default(),
+            extra_build_script_bazel_deps: bitflags_extra_bazel_builds_script_deps,
+            extra_bazel_data_deps: Default::default(),
+            extra_build_script_bazel_data_deps: bitflags_extra_bazel_builds_script_data_deps,
+            features_to_remove: BTreeSet::new(),
+        },
+    );
+
+    let config = Config {
+        repository_name: "beep".to_owned(),
+        cargo_toml_files: btreemap! { String::from("//some:Cargo.toml") => cargo_toml_file.path().to_path_buf() },
+        overrides,
+        repository_template: "https://crates-io.s3-us-west-1.amazonaws.com/crates/crates/{crate}/{crate}-{version}.crate".to_owned(),
+        target_triples: vec![
+            "x86_64-apple-darwin".to_owned(),
+            "x86_64-unknown-linux-gnu".to_owned(),
+            "x86_64-pc-windows-gnu".to_owned(),
+        ],
+        packages: vec![Package {
+            name: "tokio".to_string(),
+            semver: VersionReq::parse("=0.2.22").unwrap(),
+            features: vec![],
+        }],
+        cargo: PathBuf::from(env!("CARGO")),
+        rust_rules_workspace_name:crate_universe_resolver::config::default_rules_rust_workspace_name(),
+        index_url:crate_universe_resolver::config::default_index_url(),
+    };
+
+    let want_output = r##"
+load("@bazel_tools//tools/build_defs/repo:git.bzl", "new_git_repository")
+
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+def pinned_rust_install():
+    http_archive(
+        name = "beep__bitflags__1_2_1",
+        # TODO: Allow configuring where rust_library comes from
+        build_file_content = """# buildifier: disable=load
+load(
+    "@rules_rust//rust:rust.bzl",
+    "rust_binary",
+    "rust_library",
+    "rust_test",
+)
+
+# buildifier: disable=load
+load("@bazel_skylib//lib:selects.bzl", "selects")
+
+package(default_visibility = [
+    "//visibility:public",
+])
+
+licenses([
+    "notice",  # MIT from expression "MIT OR Apache-2.0"
+])
+
+# Generated targets
+# buildifier: disable=load-on-top
+load(
+    "@rules_rust//cargo:cargo_build_script.bzl",
+    "cargo_build_script",
+)
+
+# buildifier: leave-alone
+cargo_build_script(
+    name = "bitflags_build_script",
+    srcs = glob(["**/*.rs"]),
+    crate_root = "build.rs",
+    edition = "2015",
+    deps = [
+    ] + selects.with_or({
+        # x86_64-unknown-linux-gnu
+        (
+            "@rules_rust//rust/platform:x86_64-unknown-linux-gnu",
+        ): [
+            "@buildscriptdep//:dep",
+        ],
+        "//conditions:default": [],
+    }),
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    crate_features = [
+      "default",
+    ],
+    build_script_env = {
+        "BUILD_SCRIPT_ENV_VAR": "value",
+    },
+    data = glob(["**"], exclude=[
+        # These can be manually added with overrides if needed.
+
+        # If you run `cargo build` in this dir, the target dir can get very big very quick.
+        "target/**",
+
+        # These are not vendored from the crate - we exclude them to avoid busting caches
+        # when we change how we generate BUILD files and such.
+        "BUILD.bazel",
+        "WORKSPACE.bazel",
+        "WORKSPACE",
+    ]) + selects.with_or({
+        # x86_64-unknown-linux-gnu
+        (
+            "@rules_rust//rust/platform:x86_64-unknown-linux-gnu",
+        ): [
+            "@buildscriptdep//:somedata",
+        ],
+        "//conditions:default": [],
+    }),
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    version = "1.2.1",
+    visibility = ["//visibility:private"],
+)
+
+
+# buildifier: leave-alone
+rust_library(
+    name = "bitflags",
+    crate_type = "lib",
+    deps = [
+        ":bitflags_build_script",
+    ],
+    srcs = glob(["**/*.rs"]),
+    crate_root = "src/lib.rs",
+    edition = "2015",
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    data = glob(["**"], exclude=[
+        # These can be manually added with overrides if needed.
+
+        # If you run `cargo build` in this dir, the target dir can get very big very quick.
+        "target/**",
+
+        # These are not vendored from the crate - we exclude them to avoid busting caches
+        # when we change how we generate BUILD files and such.
+        "BUILD.bazel",
+        "WORKSPACE.bazel",
+        "WORKSPACE",
+    ]),
+    version = "1.2.1",
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    crate_features = [
+        "default",
+    ],
+    aliases = select({
+        # Default
+        "//conditions:default": {
+        },
+        #  x86_64-unknown-linux-gnu
+        "@rules_rust//rust/platform:x86_64-unknown-linux-gnu": {
+        },
+    }),
+)
+""",
+        sha256 = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693",
+        strip_prefix = "bitflags-1.2.1",
+        type = "tar.gz",
+        url = "https://crates-io.s3-us-west-1.amazonaws.com/crates/crates/bitflags/bitflags-1.2.1.crate",
+    )
+
+    http_archive(
+        name = "beep__bytes__0_5_6",
+        # TODO: Allow configuring where rust_library comes from
+        build_file_content = """# buildifier: disable=load
+load(
+    "@rules_rust//rust:rust.bzl",
+    "rust_binary",
+    "rust_library",
+    "rust_test",
+)
+
+# buildifier: disable=load
+load("@bazel_skylib//lib:selects.bzl", "selects")
+
+package(default_visibility = [
+    "//visibility:public",
+])
+
+licenses([
+    "notice",  # MIT from expression "MIT"
+])
+
+# Generated targets
+# Unsupported target "buf" with type "bench" omitted
+# Unsupported target "bytes" with type "bench" omitted
+# Unsupported target "bytes_mut" with type "bench" omitted
+
+# buildifier: leave-alone
+rust_library(
+    name = "bytes",
+    crate_type = "lib",
+    deps = [
+    ],
+    srcs = glob(["**/*.rs"]),
+    crate_root = "src/lib.rs",
+    edition = "2018",
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    data = glob(["**"], exclude=[
+        # These can be manually added with overrides if needed.
+
+        # If you run `cargo build` in this dir, the target dir can get very big very quick.
+        "target/**",
+
+        # These are not vendored from the crate - we exclude them to avoid busting caches
+        # when we change how we generate BUILD files and such.
+        "BUILD.bazel",
+        "WORKSPACE.bazel",
+        "WORKSPACE",
+    ]),
+    version = "0.5.6",
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    crate_features = [
+        "default",
+        "std",
+    ],
+    aliases = select({
+        # Default
+        "//conditions:default": {
+        },
+    }),
+)
+# Unsupported target "test_buf" with type "test" omitted
+# Unsupported target "test_buf_mut" with type "test" omitted
+# Unsupported target "test_bytes" with type "test" omitted
+# Unsupported target "test_bytes_odd_alloc" with type "test" omitted
+# Unsupported target "test_bytes_vec_alloc" with type "test" omitted
+# Unsupported target "test_chain" with type "test" omitted
+# Unsupported target "test_debug" with type "test" omitted
+# Unsupported target "test_iter" with type "test" omitted
+# Unsupported target "test_reader" with type "test" omitted
+# Unsupported target "test_serde" with type "test" omitted
+# Unsupported target "test_take" with type "test" omitted
+""",
+        sha256 = "0e4cec68f03f32e44924783795810fa50a7035d8c8ebe78580ad7e6c703fba38",
+        strip_prefix = "bytes-0.5.6",
+        type = "tar.gz",
+        url = "https://crates-io.s3-us-west-1.amazonaws.com/crates/crates/bytes/bytes-0.5.6.crate",
+    )
+
+    http_archive(
+        name = "beep__cc__1_0_62",
+        # TODO: Allow configuring where rust_library comes from
+        build_file_content = """# buildifier: disable=load
+load(
+    "@rules_rust//rust:rust.bzl",
+    "rust_binary",
+    "rust_library",
+    "rust_test",
+)
+
+# buildifier: disable=load
+load("@bazel_skylib//lib:selects.bzl", "selects")
+
+package(default_visibility = [
+    "//visibility:public",
+])
+
+licenses([
+    "notice",  # MIT from expression "MIT OR Apache-2.0"
+])
+
+# Generated targets
+
+# buildifier: leave-alone
+rust_binary(
+    # Prefix bin name to disambiguate from (probable) collision with lib name
+    # N.B.: The exact form of this is subject to change.
+    name = "cargo_bin_gcc_shim",
+    deps = [
+        # Binaries get an implicit dependency on their crate's lib
+        ":cc",
+    ],
+    srcs = glob(["**/*.rs"]),
+    crate_root = "src/bin/gcc-shim.rs",
+    edition = "2018",
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    data = glob(["**"], exclude=[
+        # These can be manually added with overrides if needed.
+
+        # If you run `cargo build` in this dir, the target dir can get very big very quick.
+        "target/**",
+
+        # These are not vendored from the crate - we exclude them to avoid busting caches
+        # when we change how we generate BUILD files and such.
+        "BUILD.bazel",
+        "WORKSPACE.bazel",
+        "WORKSPACE",
+    ]),
+    version = "1.0.62",
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    crate_features = [
+    ],
+    aliases = select({
+        # Default
+        "//conditions:default": {
+        },
+    }),
+)
+
+# buildifier: leave-alone
+rust_library(
+    name = "cc",
+    crate_type = "lib",
+    deps = [
+    ],
+    srcs = glob(["**/*.rs"]),
+    crate_root = "src/lib.rs",
+    edition = "2018",
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    data = glob(["**"], exclude=[
+        # These can be manually added with overrides if needed.
+
+        # If you run `cargo build` in this dir, the target dir can get very big very quick.
+        "target/**",
+
+        # These are not vendored from the crate - we exclude them to avoid busting caches
+        # when we change how we generate BUILD files and such.
+        "BUILD.bazel",
+        "WORKSPACE.bazel",
+        "WORKSPACE",
+    ]),
+    version = "1.0.62",
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    crate_features = [
+    ],
+    aliases = select({
+        # Default
+        "//conditions:default": {
+        },
+    }),
+)
+# Unsupported target "cc_env" with type "test" omitted
+# Unsupported target "cflags" with type "test" omitted
+# Unsupported target "cxxflags" with type "test" omitted
+# Unsupported target "test" with type "test" omitted
+""",
+        sha256 = "f1770ced377336a88a67c473594ccc14eca6f4559217c34f64aac8f83d641b40",
+        strip_prefix = "cc-1.0.62",
+        type = "tar.gz",
+        url = "https://crates-io.s3-us-west-1.amazonaws.com/crates/crates/cc/cc-1.0.62.crate",
+    )
+
+    http_archive(
+        name = "beep__lazy_static__1_4_0",
+        # TODO: Allow configuring where rust_library comes from
+        build_file_content = """# buildifier: disable=load
+load(
+    "@rules_rust//rust:rust.bzl",
+    "rust_binary",
+    "rust_library",
+    "rust_test",
+)
+
+# buildifier: disable=load
+load("@bazel_skylib//lib:selects.bzl", "selects")
+
+package(default_visibility = [
+    "//visibility:public",
+])
+
+licenses([
+    "notice",  # MIT from expression "MIT OR Apache-2.0"
+])
+
+# Generated targets
+
+# buildifier: leave-alone
+rust_library(
+    name = "lazy_static",
+    crate_type = "lib",
+    deps = [
+    ] + selects.with_or({
+        # cfg(all())
+        (
+            "@rules_rust//rust/platform:x86_64-apple-darwin",
+            "@rules_rust//rust/platform:x86_64-unknown-linux-gnu",
+        ): [
+            "@such//:dep",
+        ],
+        "//conditions:default": [],
+    }),
+    srcs = glob(["**/*.rs"]),
+    crate_root = "src/lib.rs",
+    edition = "2015",
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    data = glob(["**"], exclude=[
+        # These can be manually added with overrides if needed.
+
+        # If you run `cargo build` in this dir, the target dir can get very big very quick.
+        "target/**",
+
+        # These are not vendored from the crate - we exclude them to avoid busting caches
+        # when we change how we generate BUILD files and such.
+        "BUILD.bazel",
+        "WORKSPACE.bazel",
+        "WORKSPACE",
+    ]) + selects.with_or({
+        # x86_64-unknown-linux-gnu
+        (
+            "@rules_rust//rust/platform:x86_64-unknown-linux-gnu",
+        ): [
+            "@such//:somedata",
+        ],
+        "//conditions:default": [],
+    }),
+    version = "1.4.0",
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    crate_features = [
+    ],
+    aliases = select({
+        # Default
+        "//conditions:default": {
+        },
+        #  cfg(all())
+        "@rules_rust//rust/platform:x86_64-apple-darwin": {
+        },
+        #  cfg(all()) x86_64-unknown-linux-gnu
+        "@rules_rust//rust/platform:x86_64-unknown-linux-gnu": {
+        },
+    }),
+)
+# Unsupported target "no_std" with type "test" omitted
+# Unsupported target "test" with type "test" omitted
+""",
+        sha256 = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646",
+        strip_prefix = "lazy_static-1.4.0",
+        type = "tar.gz",
+        url = "https://crates-io.s3-us-west-1.amazonaws.com/crates/crates/lazy_static/lazy_static-1.4.0.crate",
+    )
+
+    http_archive(
+        name = "beep__libc__0_2_80",
+        # TODO: Allow configuring where rust_library comes from
+        build_file_content = """# buildifier: disable=load
+load(
+    "@rules_rust//rust:rust.bzl",
+    "rust_binary",
+    "rust_library",
+    "rust_test",
+)
+
+# buildifier: disable=load
+load("@bazel_skylib//lib:selects.bzl", "selects")
+
+package(default_visibility = [
+    "//visibility:public",
+])
+
+licenses([
+    "notice",  # MIT from expression "MIT OR Apache-2.0"
+])
+
+# Generated targets
+# buildifier: disable=load-on-top
+load(
+    "@rules_rust//cargo:cargo_build_script.bzl",
+    "cargo_build_script",
+)
+
+# buildifier: leave-alone
+cargo_build_script(
+    name = "libc_build_script",
+    srcs = glob(["**/*.rs"]),
+    crate_root = "build.rs",
+    edition = "2015",
+    deps = [
+    ],
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    crate_features = [
+      "default",
+      "std",
+    ],
+    build_script_env = {
+    },
+    data = glob(["**"], exclude=[
+        # These can be manually added with overrides if needed.
+
+        # If you run `cargo build` in this dir, the target dir can get very big very quick.
+        "target/**",
+
+        # These are not vendored from the crate - we exclude them to avoid busting caches
+        # when we change how we generate BUILD files and such.
+        "BUILD.bazel",
+        "WORKSPACE.bazel",
+        "WORKSPACE",
+    ]),
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    version = "0.2.80",
+    visibility = ["//visibility:private"],
+)
+
+
+# buildifier: leave-alone
+rust_library(
+    name = "libc",
+    crate_type = "lib",
+    deps = [
+        ":libc_build_script",
+    ],
+    srcs = glob(["**/*.rs"]),
+    crate_root = "src/lib.rs",
+    edition = "2015",
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    data = glob(["**"], exclude=[
+        # These can be manually added with overrides if needed.
+
+        # If you run `cargo build` in this dir, the target dir can get very big very quick.
+        "target/**",
+
+        # These are not vendored from the crate - we exclude them to avoid busting caches
+        # when we change how we generate BUILD files and such.
+        "BUILD.bazel",
+        "WORKSPACE.bazel",
+        "WORKSPACE",
+    ]),
+    version = "0.2.80",
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    crate_features = [
+        "default",
+        "std",
+    ],
+    aliases = select({
+        # Default
+        "//conditions:default": {
+        },
+    }),
+)
+# Unsupported target "const_fn" with type "test" omitted
+""",
+        sha256 = "4d58d1b70b004888f764dfbf6a26a3b0342a1632d33968e4a179d8011c760614",
+        strip_prefix = "libc-0.2.80",
+        type = "tar.gz",
+        url = "https://crates-io.s3-us-west-1.amazonaws.com/crates/crates/libc/libc-0.2.80.crate",
+    )
+
+    http_archive(
+        name = "beep__libz_sys__1_1_2",
+        # TODO: Allow configuring where rust_library comes from
+        build_file_content = """# buildifier: disable=load
+load(
+    "@rules_rust//rust:rust.bzl",
+    "rust_binary",
+    "rust_library",
+    "rust_test",
+)
+
+# buildifier: disable=load
+load("@bazel_skylib//lib:selects.bzl", "selects")
+
+package(default_visibility = [
+    "//visibility:public",
+])
+
+licenses([
+    "notice",  # MIT from expression "MIT OR Apache-2.0"
+])
+
+# Generated targets
+# buildifier: disable=load-on-top
+load(
+    "@rules_rust//cargo:cargo_build_script.bzl",
+    "cargo_build_script",
+)
+
+# buildifier: leave-alone
+cargo_build_script(
+    name = "libz_sys_build_script",
+    srcs = glob(["**/*.rs"]),
+    crate_root = "build.rs",
+    edition = "2015",
+    deps = [
+        "@beep__cc__1_0_62//:cc",
+        "@beep__pkg_config__0_3_19//:pkg_config",
+    ],
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    crate_features = [
+      "default",
+      "libc",
+      "stock-zlib",
+    ],
+    build_script_env = {
+    },
+    links = "z",
+    data = glob(["**"], exclude=[
+        # These can be manually added with overrides if needed.
+
+        # If you run `cargo build` in this dir, the target dir can get very big very quick.
+        "target/**",
+
+        # These are not vendored from the crate - we exclude them to avoid busting caches
+        # when we change how we generate BUILD files and such.
+        "BUILD.bazel",
+        "WORKSPACE.bazel",
+        "WORKSPACE",
+    ]),
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    version = "1.1.2",
+    visibility = ["//visibility:private"],
+)
+
+
+# buildifier: leave-alone
+rust_library(
+    name = "libz_sys",
+    crate_type = "lib",
+    deps = [
+        ":libz_sys_build_script",
+        "@beep__libc__0_2_80//:libc",
+    ],
+    srcs = glob(["**/*.rs"]),
+    crate_root = "src/lib.rs",
+    edition = "2015",
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    data = glob(["**"], exclude=[
+        # These can be manually added with overrides if needed.
+
+        # If you run `cargo build` in this dir, the target dir can get very big very quick.
+        "target/**",
+
+        # These are not vendored from the crate - we exclude them to avoid busting caches
+        # when we change how we generate BUILD files and such.
+        "BUILD.bazel",
+        "WORKSPACE.bazel",
+        "WORKSPACE",
+    ]),
+    version = "1.1.2",
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    crate_features = [
+        "default",
+        "libc",
+        "stock-zlib",
+    ],
+    aliases = select({
+        # Default
+        "//conditions:default": {
+        },
+    }),
+)
+""",
+        sha256 = "602113192b08db8f38796c4e85c39e960c145965140e918018bcde1952429655",
+        strip_prefix = "libz-sys-1.1.2",
+        type = "tar.gz",
+        url = "https://crates-io.s3-us-west-1.amazonaws.com/crates/crates/libz-sys/libz-sys-1.1.2.crate",
+    )
+
+    http_archive(
+        name = "beep__pin_project_lite__0_1_7",
+        # TODO: Allow configuring where rust_library comes from
+        build_file_content = """# buildifier: disable=load
+load(
+    "@rules_rust//rust:rust.bzl",
+    "rust_binary",
+    "rust_library",
+    "rust_test",
+)
+
+# buildifier: disable=load
+load("@bazel_skylib//lib:selects.bzl", "selects")
+
+package(default_visibility = [
+    "//visibility:public",
+])
+
+licenses([
+    "notice",  # Apache-2.0 from expression "Apache-2.0 OR MIT"
+])
+
+# Generated targets
+
+# buildifier: leave-alone
+rust_library(
+    name = "pin_project_lite",
+    crate_type = "lib",
+    deps = [
+    ],
+    srcs = glob(["**/*.rs"]),
+    crate_root = "src/lib.rs",
+    edition = "2018",
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    data = glob(["**"], exclude=[
+        # These can be manually added with overrides if needed.
+
+        # If you run `cargo build` in this dir, the target dir can get very big very quick.
+        "target/**",
+
+        # These are not vendored from the crate - we exclude them to avoid busting caches
+        # when we change how we generate BUILD files and such.
+        "BUILD.bazel",
+        "WORKSPACE.bazel",
+        "WORKSPACE",
+    ]),
+    version = "0.1.7",
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    crate_features = [
+    ],
+    aliases = select({
+        # Default
+        "//conditions:default": {
+        },
+    }),
+)
+# Unsupported target "compiletest" with type "test" omitted
+# Unsupported target "lint" with type "test" omitted
+# Unsupported target "test" with type "test" omitted
+""",
+        sha256 = "282adbf10f2698a7a77f8e983a74b2d18176c19a7fd32a45446139ae7b02b715",
+        strip_prefix = "pin-project-lite-0.1.7",
+        type = "tar.gz",
+        url = "https://crates-io.s3-us-west-1.amazonaws.com/crates/crates/pin-project-lite/pin-project-lite-0.1.7.crate",
+    )
+
+    http_archive(
+        name = "beep__pkg_config__0_3_19",
+        # TODO: Allow configuring where rust_library comes from
+        build_file_content = """# buildifier: disable=load
+load(
+    "@rules_rust//rust:rust.bzl",
+    "rust_binary",
+    "rust_library",
+    "rust_test",
+)
+
+# buildifier: disable=load
+load("@bazel_skylib//lib:selects.bzl", "selects")
+
+package(default_visibility = [
+    "//visibility:public",
+])
+
+licenses([
+    "notice",  # MIT from expression "MIT OR Apache-2.0"
+])
+
+# Generated targets
+
+# buildifier: leave-alone
+rust_library(
+    name = "pkg_config",
+    crate_type = "lib",
+    deps = [
+    ],
+    srcs = glob(["**/*.rs"]),
+    crate_root = "src/lib.rs",
+    edition = "2015",
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    data = glob(["**"], exclude=[
+        # These can be manually added with overrides if needed.
+
+        # If you run `cargo build` in this dir, the target dir can get very big very quick.
+        "target/**",
+
+        # These are not vendored from the crate - we exclude them to avoid busting caches
+        # when we change how we generate BUILD files and such.
+        "BUILD.bazel",
+        "WORKSPACE.bazel",
+        "WORKSPACE",
+    ]),
+    version = "0.3.19",
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    crate_features = [
+    ],
+    aliases = select({
+        # Default
+        "//conditions:default": {
+        },
+    }),
+)
+# Unsupported target "test" with type "test" omitted
+""",
+        sha256 = "3831453b3449ceb48b6d9c7ad7c96d5ea673e9b470a1dc578c2ce6521230884c",
+        strip_prefix = "pkg-config-0.3.19",
+        type = "tar.gz",
+        url = "https://crates-io.s3-us-west-1.amazonaws.com/crates/crates/pkg-config/pkg-config-0.3.19.crate",
+    )
+
+    http_archive(
+        name = "beep__tokio__0_2_22",
+        # TODO: Allow configuring where rust_library comes from
+        build_file_content = """# buildifier: disable=load
+load(
+    "@rules_rust//rust:rust.bzl",
+    "rust_binary",
+    "rust_library",
+    "rust_test",
+)
+
+# buildifier: disable=load
+load("@bazel_skylib//lib:selects.bzl", "selects")
+
+package(default_visibility = [
+    "//visibility:public",
+])
+
+licenses([
+    "notice",  # MIT from expression "MIT"
+])
+
+# Generated targets
+
+# buildifier: leave-alone
+rust_library(
+    name = "tokio",
+    crate_type = "lib",
+    deps = [
+        "@beep__bytes__0_5_6//:bytes",
+        "@beep__pin_project_lite__0_1_7//:pin_project_lite",
+    ] + selects.with_or({
+        # cfg(unix)
+        (
+            "@rules_rust//rust/platform:x86_64-apple-darwin",
+            "@rules_rust//rust/platform:x86_64-unknown-linux-gnu",
+        ): [
+            "@yetanother//:dep",
+        ],
+        "//conditions:default": [],
+    }) + selects.with_or({
+        # x86_64-apple-darwin
+        (
+            "@rules_rust//rust/platform:x86_64-apple-darwin",
+        ): [
+            "@some//:dep",
+            "@other//:dep",
+        ],
+        "//conditions:default": [],
+    }),
+    srcs = glob(["**/*.rs"]),
+    crate_root = "src/lib.rs",
+    edition = "2018",
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    rustc_env = {
+        "ENV_VAR_1": "value1",
+        "ENV_VAR_2": "value2",
+    },
+    data = glob(["**"], exclude=[
+        # These can be manually added with overrides if needed.
+
+        # If you run `cargo build` in this dir, the target dir can get very big very quick.
+        "target/**",
+
+        # These are not vendored from the crate - we exclude them to avoid busting caches
+        # when we change how we generate BUILD files and such.
+        "BUILD.bazel",
+        "WORKSPACE.bazel",
+        "WORKSPACE",
+    ]),
+    version = "0.2.22",
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    crate_features = [
+        "default",
+    ],
+    aliases = select({
+        # Default
+        "//conditions:default": {
+        },
+        #  cfg(unix) cfg(unix) x86_64-apple-darwin
+        "@rules_rust//rust/platform:x86_64-apple-darwin": {
+        },
+        #  cfg(unix) cfg(unix)
+        "@rules_rust//rust/platform:x86_64-unknown-linux-gnu": {
+        },
+    }),
+)
+# Unsupported target "_require_full" with type "test" omitted
+# Unsupported target "async_send_sync" with type "test" omitted
+# Unsupported target "buffered" with type "test" omitted
+# Unsupported target "fs" with type "test" omitted
+# Unsupported target "fs_copy" with type "test" omitted
+# Unsupported target "fs_dir" with type "test" omitted
+# Unsupported target "fs_file" with type "test" omitted
+# Unsupported target "fs_file_mocked" with type "test" omitted
+# Unsupported target "fs_link" with type "test" omitted
+# Unsupported target "io_async_read" with type "test" omitted
+# Unsupported target "io_chain" with type "test" omitted
+# Unsupported target "io_copy" with type "test" omitted
+# Unsupported target "io_driver" with type "test" omitted
+# Unsupported target "io_driver_drop" with type "test" omitted
+# Unsupported target "io_lines" with type "test" omitted
+# Unsupported target "io_read" with type "test" omitted
+# Unsupported target "io_read_exact" with type "test" omitted
+# Unsupported target "io_read_line" with type "test" omitted
+# Unsupported target "io_read_to_end" with type "test" omitted
+# Unsupported target "io_read_to_string" with type "test" omitted
+# Unsupported target "io_read_until" with type "test" omitted
+# Unsupported target "io_split" with type "test" omitted
+# Unsupported target "io_take" with type "test" omitted
+# Unsupported target "io_write" with type "test" omitted
+# Unsupported target "io_write_all" with type "test" omitted
+# Unsupported target "io_write_int" with type "test" omitted
+# Unsupported target "macros_join" with type "test" omitted
+# Unsupported target "macros_pin" with type "test" omitted
+# Unsupported target "macros_select" with type "test" omitted
+# Unsupported target "macros_test" with type "test" omitted
+# Unsupported target "macros_try_join" with type "test" omitted
+# Unsupported target "net_bind_resource" with type "test" omitted
+# Unsupported target "net_lookup_host" with type "test" omitted
+# Unsupported target "no_rt" with type "test" omitted
+# Unsupported target "process_issue_2174" with type "test" omitted
+# Unsupported target "process_issue_42" with type "test" omitted
+# Unsupported target "process_kill_on_drop" with type "test" omitted
+# Unsupported target "process_smoke" with type "test" omitted
+# Unsupported target "read_to_string" with type "test" omitted
+# Unsupported target "rt_basic" with type "test" omitted
+# Unsupported target "rt_common" with type "test" omitted
+# Unsupported target "rt_threaded" with type "test" omitted
+# Unsupported target "signal_ctrl_c" with type "test" omitted
+# Unsupported target "signal_drop_recv" with type "test" omitted
+# Unsupported target "signal_drop_rt" with type "test" omitted
+# Unsupported target "signal_drop_signal" with type "test" omitted
+# Unsupported target "signal_multi_rt" with type "test" omitted
+# Unsupported target "signal_no_rt" with type "test" omitted
+# Unsupported target "signal_notify_both" with type "test" omitted
+# Unsupported target "signal_twice" with type "test" omitted
+# Unsupported target "signal_usr1" with type "test" omitted
+# Unsupported target "stream_chain" with type "test" omitted
+# Unsupported target "stream_collect" with type "test" omitted
+# Unsupported target "stream_empty" with type "test" omitted
+# Unsupported target "stream_fuse" with type "test" omitted
+# Unsupported target "stream_iter" with type "test" omitted
+# Unsupported target "stream_merge" with type "test" omitted
+# Unsupported target "stream_once" with type "test" omitted
+# Unsupported target "stream_pending" with type "test" omitted
+# Unsupported target "stream_reader" with type "test" omitted
+# Unsupported target "stream_stream_map" with type "test" omitted
+# Unsupported target "stream_timeout" with type "test" omitted
+# Unsupported target "sync_barrier" with type "test" omitted
+# Unsupported target "sync_broadcast" with type "test" omitted
+# Unsupported target "sync_cancellation_token" with type "test" omitted
+# Unsupported target "sync_errors" with type "test" omitted
+# Unsupported target "sync_mpsc" with type "test" omitted
+# Unsupported target "sync_mutex" with type "test" omitted
+# Unsupported target "sync_mutex_owned" with type "test" omitted
+# Unsupported target "sync_notify" with type "test" omitted
+# Unsupported target "sync_oneshot" with type "test" omitted
+# Unsupported target "sync_rwlock" with type "test" omitted
+# Unsupported target "sync_semaphore" with type "test" omitted
+# Unsupported target "sync_semaphore_owned" with type "test" omitted
+# Unsupported target "sync_watch" with type "test" omitted
+# Unsupported target "task_blocking" with type "test" omitted
+# Unsupported target "task_local" with type "test" omitted
+# Unsupported target "task_local_set" with type "test" omitted
+# Unsupported target "tcp_accept" with type "test" omitted
+# Unsupported target "tcp_connect" with type "test" omitted
+# Unsupported target "tcp_echo" with type "test" omitted
+# Unsupported target "tcp_into_split" with type "test" omitted
+# Unsupported target "tcp_peek" with type "test" omitted
+# Unsupported target "tcp_shutdown" with type "test" omitted
+# Unsupported target "tcp_split" with type "test" omitted
+# Unsupported target "test_clock" with type "test" omitted
+# Unsupported target "time_delay" with type "test" omitted
+# Unsupported target "time_delay_queue" with type "test" omitted
+# Unsupported target "time_interval" with type "test" omitted
+# Unsupported target "time_rt" with type "test" omitted
+# Unsupported target "time_throttle" with type "test" omitted
+# Unsupported target "time_timeout" with type "test" omitted
+# Unsupported target "udp" with type "test" omitted
+# Unsupported target "uds_cred" with type "test" omitted
+# Unsupported target "uds_datagram" with type "test" omitted
+# Unsupported target "uds_split" with type "test" omitted
+# Unsupported target "uds_stream" with type "test" omitted
+""",
+        sha256 = "5d34ca54d84bf2b5b4d7d31e901a8464f7b60ac145a284fba25ceb801f2ddccd",
+        strip_prefix = "tokio-0.2.22",
+        type = "tar.gz",
+        url = "https://crates-io.s3-us-west-1.amazonaws.com/crates/crates/tokio/tokio-0.2.22.crate",
+    )
+
+    http_archive(
+        name = "beep__vcpkg__0_2_10",
+        # TODO: Allow configuring where rust_library comes from
+        build_file_content = """# buildifier: disable=load
+load(
+    "@rules_rust//rust:rust.bzl",
+    "rust_binary",
+    "rust_library",
+    "rust_test",
+)
+
+# buildifier: disable=load
+load("@bazel_skylib//lib:selects.bzl", "selects")
+
+package(default_visibility = [
+    "//visibility:public",
+])
+
+licenses([
+    "notice",  # MIT from expression "MIT OR Apache-2.0"
+])
+
+# Generated targets
+
+# buildifier: leave-alone
+rust_library(
+    name = "vcpkg",
+    crate_type = "lib",
+    deps = [
+    ],
+    srcs = glob(["**/*.rs"]),
+    crate_root = "src/lib.rs",
+    edition = "2015",
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    data = glob(["**"], exclude=[
+        # These can be manually added with overrides if needed.
+
+        # If you run `cargo build` in this dir, the target dir can get very big very quick.
+        "target/**",
+
+        # These are not vendored from the crate - we exclude them to avoid busting caches
+        # when we change how we generate BUILD files and such.
+        "BUILD.bazel",
+        "WORKSPACE.bazel",
+        "WORKSPACE",
+    ]),
+    version = "0.2.10",
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    crate_features = [
+    ],
+    aliases = select({
+        # Default
+        "//conditions:default": {
+        },
+    }),
+)
+""",
+        sha256 = "6454029bf181f092ad1b853286f23e2c507d8e8194d01d92da4a55c274a5508c",
+        strip_prefix = "vcpkg-0.2.10",
+        type = "tar.gz",
+        url = "https://crates-io.s3-us-west-1.amazonaws.com/crates/crates/vcpkg/vcpkg-0.2.10.crate",
+    )
+
+
+CRATE_TARGET_NAMES = {
+    "bitflags": "@beep__bitflags__1_2_1//:bitflags",
+    "bytes": "@beep__bytes__0_5_6//:bytes",
+    "cc": "@beep__cc__1_0_62//:cc",
+    "lazy_static": "@beep__lazy_static__1_4_0//:lazy_static",
+    "libc": "@beep__libc__0_2_80//:libc",
+    "libz-sys": "@beep__libz_sys__1_1_2//:libz_sys",
+    "pin-project-lite": "@beep__pin_project_lite__0_1_7//:pin_project_lite",
+    "pkg-config": "@beep__pkg_config__0_3_19//:pkg_config",
+    "tokio": "@beep__tokio__0_2_22//:tokio",
+    "vcpkg": "@beep__vcpkg__0_2_10//:vcpkg",
+}
+
+def crate(crate_name):
+    """Return the name of the target for the given crate.
+    """
+    target_name = CRATE_TARGET_NAMES.get(crate_name)
+    if target_name == None:
+        fail("Unknown crate name: {}".format(crate_name))
+    return target_name
+
+def all_deps():
+    """Return all standard dependencies explicitly listed in the Cargo.toml or packages list."""
+    return [
+        crate(crate_name) for crate_name in [
+            "bitflags",
+            "bytes",
+            "cc",
+            "lazy_static",
+            "libc",
+            "libz-sys",
+            "pin-project-lite",
+            "pkg-config",
+            "tokio",
+            "vcpkg",
+        ]
+    ]
+
+def all_proc_macro_deps():
+    """Return all proc-macro dependencies explicitly listed in the Cargo.toml or packages list."""
+    return [
+        crate(crate_name) for crate_name in [
+        ]
+    ]
+
+def crates_from(label):
+    mapping = {
+        "//some:Cargo.toml": [crate("bitflags"), crate("bytes"), crate("cc"), crate("lazy_static"), crate("libc"), crate("libz-sys"), crate("pin-project-lite"), crate("pkg-config"), crate("vcpkg")],
+    }
+    return mapping[_absolutify(label)]
+
+def dev_crates_from(label):
+    mapping = {
+        "//some:Cargo.toml": [],
+    }
+    return mapping[_absolutify(label)]
+
+def build_crates_from(label):
+    mapping = {
+        "//some:Cargo.toml": [],
+    }
+    return mapping[_absolutify(label)]
+
+def proc_macro_crates_from(label):
+    mapping = {
+        "//some:Cargo.toml": [],
+    }
+    return mapping[_absolutify(label)]
+
+def _absolutify(label):
+    if label.startswith("//") or label.startswith("@"):
+        return label
+    if label.startswith(":"):
+        return "//" + native.package_name() + label
+    return "//" + native.package_name() + ":" + label
+"##;
+
+    // Ignore header which contains a hash
+    test(&config)
+        .success()
+        .stdout(predicates::str::ends_with(want_output));
+}
+
+#[test]
+fn aliased_deps() {
+    let cargo_toml_file = NamedTempFile::with_str_content(
+        "Cargo.toml",
+        r#"[package]
+name = "basic"
+version = "0.1.0"
+edition = "2018"
+
+[dependencies]
+plist = "=1.0.0"
+"#,
+    )
+    .expect("Error making temporary file");
+
+    let config = Config {
+        repository_name: "hurrah".to_owned(),
+        cargo_toml_files: btreemap! { String::from("//some:Cargo.toml") => cargo_toml_file.path().to_path_buf() },
+        overrides: Default::default(),
+        repository_template: "https://crates-io.s3-us-west-1.amazonaws.com/crates/crates/{crate}/{crate}-{version}.crate".to_owned(),
+        target_triples: vec!["x86_64-apple-darwin".to_owned()],
+        packages: vec![],
+        cargo: PathBuf::from(env!("CARGO")),
+        rust_rules_workspace_name:crate_universe_resolver::config::default_rules_rust_workspace_name(),
+        index_url:crate_universe_resolver::config::default_index_url(),
+    };
+
+    let want_output = r#"aliases = select({
+        # Default
+        "//conditions:default": {
+            "@hurrah__xml_rs__0_8_3//:xml_rs": "xml_rs",
+        },
+    })"#;
+
+    // Ignore header which contains a hash
+    test(&config)
+        .success()
+        .stdout(predicates::str::contains(want_output));
+}
+
+#[test]
+fn git_deps() {
+    let cargo_toml_file = NamedTempFile::with_str_content(
+        "Cargo.toml",
+        r#"[package]
+name = "has_git_deps"
+version = "0.1.0"
+edition = "2018"
+
+[dependencies]
+tonic-build = "=0.3.1"
+anyhow = "=1.0.33"
+itertools = "=0.9.0"
+proc-macro2 = "=1.0.24"
+quote = "=1.0.7"
+syn = "=1.0.45"
+
+[patch.crates-io]
+prost = { git = "https://github.com/danburkert/prost.git", rev = "4ded4a98ef339da0b7babd4efee3fbe8adaf746b" }
+prost-build = { git = "https://github.com/danburkert/prost.git", rev = "4ded4a98ef339da0b7babd4efee3fbe8adaf746b" }
+prost-derive = { git = "https://github.com/danburkert/prost.git", rev = "4ded4a98ef339da0b7babd4efee3fbe8adaf746b" }
+prost-types = { git = "https://github.com/danburkert/prost.git", rev = "4ded4a98ef339da0b7babd4efee3fbe8adaf746b" }
+"#,
+    )
+        .expect("Error making temporary file");
+
+    let config = Config {
+        repository_name: "yep".to_owned(),
+        cargo_toml_files: btreemap! { String::from("//some:Cargo.toml") => cargo_toml_file.path().to_path_buf() },
+        overrides: Default::default(),
+        repository_template: "https://crates-io.s3-us-west-1.amazonaws.com/crates/crates/{crate}/{crate}-{version}.crate".to_owned(),
+        target_triples: vec!["x86_64-apple-darwin".to_owned()],
+        packages: vec![],
+        cargo: PathBuf::from(env!("CARGO")),
+        rust_rules_workspace_name:crate_universe_resolver::config::default_rules_rust_workspace_name(),
+        index_url:crate_universe_resolver::config::default_index_url(),
+    };
+
+    let wanted_prost = r###"    new_git_repository(
+        name = "yep__prost__0_6_1",
+        strip_prefix = "",
+        build_file_content = """# buildifier: disable=load
+load(
+    "@rules_rust//rust:rust.bzl",
+    "rust_binary",
+    "rust_library",
+    "rust_test",
+)
+
+# buildifier: disable=load
+load("@bazel_skylib//lib:selects.bzl", "selects")
+
+package(default_visibility = [
+    "//visibility:public",
+])
+
+licenses([
+    "notice",  # Apache-2.0 from expression "Apache-2.0"
+])
+
+# Generated targets
+# Unsupported target "varint" with type "bench" omitted
+
+# buildifier: leave-alone
+rust_library(
+    name = "prost",
+    crate_type = "lib",
+    deps = [
+        "@yep__bytes__0_5_6//:bytes",
+    ],
+    srcs = glob(["**/*.rs"]),
+    crate_root = "src/lib.rs",
+    edition = "2018",
+    proc_macro_deps = [
+        "@yep__prost_derive__0_6_1//:prost_derive",
+    ],
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    data = glob(["**"], exclude=[
+        # These can be manually added with overrides if needed.
+
+        # If you run `cargo build` in this dir, the target dir can get very big very quick.
+        "target/**",
+
+        # These are not vendored from the crate - we exclude them to avoid busting caches
+        # when we change how we generate BUILD files and such.
+        "BUILD.bazel",
+        "WORKSPACE.bazel",
+        "WORKSPACE",
+    ]),
+    version = "0.6.1",
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    crate_features = [
+        "prost-derive",
+    ],
+    aliases = select({
+        # Default
+        "//conditions:default": {
+        },
+    }),
+)
+""",
+        remote = "https://github.com/danburkert/prost.git",
+        # TODO: tag?
+        commit = "4ded4a98ef339da0b7babd4efee3fbe8adaf746b",
+    )"###;
+
+    let unwanted_prost = r###"http_archive(
+        name = "yep__prost__0_6_1","###;
+
+    let wanted_prost_build = r###"    new_git_repository(
+        name = "yep__prost_build__0_6_1",
+        strip_prefix = "prost-build",
+        build_file_content = """# buildifier: disable=load
+load(
+    "@rules_rust//rust:rust.bzl",
+    "rust_binary",
+    "rust_library",
+    "rust_test",
+)
+
+# buildifier: disable=load
+load("@bazel_skylib//lib:selects.bzl", "selects")
+
+package(default_visibility = [
+    "//visibility:public",
+])
+
+licenses([
+    "notice",  # Apache-2.0 from expression "Apache-2.0"
+])
+
+# Generated targets
+# buildifier: disable=load-on-top
+load(
+    "@rules_rust//cargo:cargo_build_script.bzl",
+    "cargo_build_script",
+)
+
+# buildifier: leave-alone
+cargo_build_script(
+    name = "prost_build_build_script",
+    srcs = glob(["**/*.rs"]),
+    crate_root = "build.rs",
+    edition = "2018",
+    deps = [
+        "@yep__which__4_0_2//:which",
+    ],
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    crate_features = [
+    ],
+    build_script_env = {
+    },
+    data = glob(["**"], exclude=[
+        # These can be manually added with overrides if needed.
+
+        # If you run `cargo build` in this dir, the target dir can get very big very quick.
+        "target/**",
+
+        # These are not vendored from the crate - we exclude them to avoid busting caches
+        # when we change how we generate BUILD files and such.
+        "BUILD.bazel",
+        "WORKSPACE.bazel",
+        "WORKSPACE",
+    ]),
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    version = "0.6.1",
+    visibility = ["//visibility:private"],
+)
+
+
+# buildifier: leave-alone
+rust_library(
+    name = "prost_build",
+    crate_type = "lib",
+    deps = [
+        ":prost_build_build_script",
+        "@yep__bytes__0_5_6//:bytes",
+        "@yep__heck__0_3_2//:heck",
+        "@yep__itertools__0_9_0//:itertools",
+        "@yep__log__0_4_14//:log",
+        "@yep__multimap__0_8_2//:multimap",
+        "@yep__petgraph__0_5_1//:petgraph",
+        "@yep__prost__0_6_1//:prost",
+        "@yep__prost_types__0_6_1//:prost_types",
+        "@yep__tempfile__3_2_0//:tempfile",
+    ],
+    srcs = glob(["**/*.rs"]),
+    crate_root = "src/lib.rs",
+    edition = "2018",
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    data = glob(["**"], exclude=[
+        # These can be manually added with overrides if needed.
+
+        # If you run `cargo build` in this dir, the target dir can get very big very quick.
+        "target/**",
+
+        # These are not vendored from the crate - we exclude them to avoid busting caches
+        # when we change how we generate BUILD files and such.
+        "BUILD.bazel",
+        "WORKSPACE.bazel",
+        "WORKSPACE",
+    ]),
+    version = "0.6.1",
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    crate_features = [
+    ],
+    aliases = select({
+        # Default
+        "//conditions:default": {
+        },
+    }),
+)
+""",
+        remote = "https://github.com/danburkert/prost.git",
+        # TODO: tag?
+        commit = "4ded4a98ef339da0b7babd4efee3fbe8adaf746b",
+    )"###;
+
+    let unwanted_prost_build = r###"http_archive(
+        name = "yep__prost_build__0_6_1","###;
+
+    let wanted_prost_derive = r###"    new_git_repository(
+        name = "yep__prost_derive__0_6_1",
+        strip_prefix = "prost-derive",
+        build_file_content = """# buildifier: disable=load
+load(
+    "@rules_rust//rust:rust.bzl",
+    "rust_binary",
+    "rust_library",
+    "rust_test",
+)
+
+# buildifier: disable=load
+load("@bazel_skylib//lib:selects.bzl", "selects")
+
+package(default_visibility = [
+    "//visibility:public",
+])
+
+licenses([
+    "notice",  # Apache-2.0 from expression "Apache-2.0"
+])
+
+# Generated targets
+
+# buildifier: leave-alone
+rust_library(
+    name = "prost_derive",
+    crate_type = "proc-macro",
+    deps = [
+        "@yep__anyhow__1_0_33//:anyhow",
+        "@yep__itertools__0_9_0//:itertools",
+        "@yep__proc_macro2__1_0_24//:proc_macro2",
+        "@yep__quote__1_0_7//:quote",
+        "@yep__syn__1_0_45//:syn",
+    ],
+    srcs = glob(["**/*.rs"]),
+    crate_root = "src/lib.rs",
+    edition = "2018",
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    data = glob(["**"], exclude=[
+        # These can be manually added with overrides if needed.
+
+        # If you run `cargo build` in this dir, the target dir can get very big very quick.
+        "target/**",
+
+        # These are not vendored from the crate - we exclude them to avoid busting caches
+        # when we change how we generate BUILD files and such.
+        "BUILD.bazel",
+        "WORKSPACE.bazel",
+        "WORKSPACE",
+    ]),
+    version = "0.6.1",
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    crate_features = [
+    ],
+    aliases = select({
+        # Default
+        "//conditions:default": {
+        },
+    }),
+)
+""",
+        remote = "https://github.com/danburkert/prost.git",
+        # TODO: tag?
+        commit = "4ded4a98ef339da0b7babd4efee3fbe8adaf746b",
+    )"###;
+
+    let unwanted_prost_derive = r###"http_archive(
+        name = "yep__prost_derive__0_6_1","###;
+
+    let wanted_prost_types = r###"    new_git_repository(
+        name = "yep__prost_types__0_6_1",
+        strip_prefix = "prost-types",
+        build_file_content = """# buildifier: disable=load
+load(
+    "@rules_rust//rust:rust.bzl",
+    "rust_binary",
+    "rust_library",
+    "rust_test",
+)
+
+# buildifier: disable=load
+load("@bazel_skylib//lib:selects.bzl", "selects")
+
+package(default_visibility = [
+    "//visibility:public",
+])
+
+licenses([
+    "notice",  # Apache-2.0 from expression "Apache-2.0"
+])
+
+# Generated targets
+
+# buildifier: leave-alone
+rust_library(
+    name = "prost_types",
+    crate_type = "lib",
+    deps = [
+        "@yep__bytes__0_5_6//:bytes",
+        "@yep__prost__0_6_1//:prost",
+    ],
+    srcs = glob(["**/*.rs"]),
+    crate_root = "src/lib.rs",
+    edition = "2018",
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    data = glob(["**"], exclude=[
+        # These can be manually added with overrides if needed.
+
+        # If you run `cargo build` in this dir, the target dir can get very big very quick.
+        "target/**",
+
+        # These are not vendored from the crate - we exclude them to avoid busting caches
+        # when we change how we generate BUILD files and such.
+        "BUILD.bazel",
+        "WORKSPACE.bazel",
+        "WORKSPACE",
+    ]),
+    version = "0.6.1",
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    crate_features = [
+    ],
+    aliases = select({
+        # Default
+        "//conditions:default": {
+        },
+    }),
+)
+""",
+        remote = "https://github.com/danburkert/prost.git",
+        # TODO: tag?
+        commit = "4ded4a98ef339da0b7babd4efee3fbe8adaf746b",
+    )"###;
+
+    let unwanted_prost_types = r###"http_archive(
+        name = "yep__prost_types__0_6_1","###;
+
+    let result = test(&config).success();
+    result
+        .stdout(predicates::str::contains(wanted_prost))
+        .stdout(predicates::str::contains(wanted_prost_build))
+        .stdout(predicates::str::contains(wanted_prost_derive))
+        .stdout(predicates::str::contains(wanted_prost_types))
+        .stdout(predicates::str::contains(unwanted_prost).not())
+        .stdout(predicates::str::contains(unwanted_prost_build).not())
+        .stdout(predicates::str::contains(unwanted_prost_derive).not())
+        .stdout(predicates::str::contains(unwanted_prost_types).not());
+}
+
+#[test]
+#[ignore] // TODO: Unignore when we fix workspace support - currently broken by the fact that we generate our Cargo.toml somewhere standalone but don't strip out the workspace information
+fn workspace_root() {
+    let dir = tempfile::tempdir().expect("Could not make tempdir");
+    let subdir = dir.path().join("subcrate");
+    create_dir_all(&subdir).expect("Could not make subcrate dir");
+    let workspace_cargo_toml = dir.path().join("Cargo.toml");
+    std::fs::write(
+        &workspace_cargo_toml,
+        r#"[workspace]
+members = ["subcrate"]
+
+[package]
+name = "ws"
+version = "0.1.0"
+edition = "2018"
+
+[dependencies]
+lazy_static = "=1.4.0"
+
+# TODO: do not depend on this section to be present rules_rust_external.
+[lib]
+path = "lib.rs"
+"#
+        .as_bytes(),
+    )
+    .expect("Failed to write Cargo.toml");
+
+    std::fs::write(
+        subdir.join("Cargo.toml"),
+        r#"[package]
+name = "subcrate"
+version = "0.1.0"
+edition = "2018"
+
+[dependencies]
+bitflags = "=1.2.1"
+
+# TODO: do not depend on this section to be present rules_rust_external.
+[lib]
+path = "lib.rs"
+"#
+        .as_bytes(),
+    )
+    .expect("Failed to write Cargo.toml");
+
+    let config = Config {
+        repository_name: "another".to_owned(),
+        cargo_toml_files: btreemap! { String::from("//some/other:Cargo.toml") => workspace_cargo_toml },
+        overrides: Default::default(),
+        repository_template: "https://crates-io.s3-us-west-1.amazonaws.com/crates/crates/{crate}/{crate}-{version}.crate".to_owned(),
+        target_triples: vec!["x86_64-apple-darwin".to_owned()],
+        packages: vec![],
+        cargo: PathBuf::from(env!("CARGO")),
+        rust_rules_workspace_name:crate_universe_resolver::config::default_rules_rust_workspace_name(),
+        index_url:crate_universe_resolver::config::default_index_url(),
+    };
+
+    test(&config).success().stdout(eq(r#"load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+def pinned_rust_install():
+    http_archive(
+    name = "bitflags",
+    # TODO: Allow configuring where rust_library comes from
+    build_file_content = """load("@rules_rust//rust:rust.bzl", "rust_library")
+load("@rules_rust//cargo:cargo_build_script.bzl", "cargo_build_script")
+
+cargo_build_script(
+    name = "bitflags_build_script",
+    srcs = glob(["**/*.rs"]),
+    crate_root = "build.rs",
+    deps = [],
+    proc_macro_deps = [],
+    data = glob(["**"]),
+    edition = "2015",
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    crate_features = [
+        "default"
+    ],
+    version = "1.2.1",
+)
+
+
+rust_library(
+    name = "bitflags",
+    srcs = glob(["**/*.rs"]),
+    crate_features = [
+        "default"
+    ],
+    crate_root = "src/lib.rs",
+    crate_type = "lib",
+    edition = "2015",
+    proc_macro_deps = [],
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    version = "1.2.1",
+    visibility = ["//visibility:public"],
+    deps = [
+        ":bitflags_build_script"
+    ],
+)
+""",
+    strip_prefix = "bitflags-1.2.1",
+    type = "tar.gz",
+    url = "https://crates-io.s3-us-west-1.amazonaws.com/crates/crates/bitflags/bitflags-1.2.1.crate",
+)
+    http_archive(
+    name = "lazy_static",
+    # TODO: Allow configuring where rust_library comes from
+    build_file_content = """load("@rules_rust//rust:rust.bzl", "rust_library")
+
+rust_library(
+    name = "lazy_static",
+    srcs = glob(["**/*.rs"]),
+    crate_features = [],
+    crate_root = "src/lib.rs",
+    crate_type = "lib",
+    edition = "2015",
+    proc_macro_deps = [],
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    version = "1.4.0",
+    visibility = ["//visibility:public"],
+    deps = [],
+)
+""",
+    strip_prefix = "lazy_static-1.4.0",
+    type = "tar.gz",
+    url = "https://crates-io.s3-us-west-1.amazonaws.com/crates/crates/lazy_static/lazy_static-1.4.0.crate",
+)
+"#
+    ));
+}
+
+fn test(config: &Config) -> Assert {
+    Command::cargo_bin(env!("CARGO_PKG_NAME"))
+        .unwrap()
+        .arg("--input_path")
+        .arg("/dev/stdin")
+        .arg("--output_path")
+        .arg("/dev/stdout")
+        .arg("--repo-name")
+        .arg("whatever")
+        .write_stdin(serde_json::to_string(&config).unwrap())
+        .assert()
+}
+
+// Tests still to add:
+// Transitive deps
+// Lib and bin in the same crate
diff --git a/cargo/crate_universe_resolver/tests/parser.rs b/cargo/crate_universe_resolver/tests/parser.rs
new file mode 100644
index 0000000000..fe10b3bc70
--- /dev/null
+++ b/cargo/crate_universe_resolver/tests/parser.rs
@@ -0,0 +1,355 @@
+use indoc::indoc;
+use maplit::{btreemap, btreeset};
+use crate_universe_resolver::config::Package;
+use crate_universe_resolver::parser::merge_cargo_tomls;
+use crate_universe_resolver::NamedTempFile;
+use semver::VersionReq;
+use spectral::prelude::*;
+use std::collections::{BTreeMap, BTreeSet};
+
+#[test]
+fn parses_one_cargo_toml() {
+    let cargo_toml = indoc! { r#"
+    [package]
+    name = "frobber"
+    version = "0.1.0"
+
+    [dependencies]
+    # Normalises string or map values
+    lazy_static = { version = "1" }
+    maplit = "1.0.1"
+    serde = { version = "1", default-features = false, features = ["derive"] }
+    structopt = { version = "0.3", optional = true }
+
+    [patch.crates-io]
+    syn = { git = "https://github.com/forked/syn.git" }
+
+    [features]
+    cmd = ["structopt"]
+
+    [dev-dependencies]
+    futures = "0.1"
+
+    [build-dependencies]
+    syn = "1"
+    "# };
+
+    let cargo_tomls = btreemap! { "//some:Cargo.toml" => cargo_toml };
+
+    let want_deps = indoc! {r#"
+    lazy_static = { version = ">=1.0.0, <2.0.0", default-features = true, features = [] }
+    maplit = { version = ">=1.0.1, <2.0.0", default-features = true, features = [] }
+    serde = { version = ">=1.0.0, <2.0.0", default-features = false, features = ["derive"] }
+    structopt = { version = ">=0.3.0, <0.4.0", default-features = true, features = [] }
+    "#};
+
+    let want_labels_to_deps = btreemap! {
+        "//some:Cargo.toml" => btreeset!{
+            "futures",
+            "lazy_static",
+            "maplit",
+            "serde",
+            "structopt",
+            "syn",
+        },
+    };
+
+    let value = test(cargo_tomls, vec![], want_deps, want_labels_to_deps);
+
+    let patch_syn_git = value
+        .as_table()
+        .unwrap()
+        .get("patch")
+        .unwrap()
+        .as_table()
+        .unwrap()
+        .get("crates-io")
+        .unwrap()
+        .as_table()
+        .unwrap()
+        .get("syn")
+        .unwrap()
+        .as_table()
+        .unwrap()
+        .get("git")
+        .unwrap()
+        .as_str()
+        .unwrap();
+    assert_eq!("https://github.com/forked/syn.git", patch_syn_git);
+
+    assert_eq!(
+        value.as_table().unwrap().get("build-dependencies").unwrap(),
+        &r#"syn = { version = ">=1.0.0, <2.0.0", default-features = true, features = [] }"#
+            .parse::<toml::Value>()
+            .unwrap(),
+    );
+
+    assert_eq!(
+        value.as_table().unwrap().get("dev-dependencies").unwrap(),
+        &r#"futures = { version = ">=0.1.0, <0.2.0", default-features = true, features = [] }"#
+            .parse::<toml::Value>()
+            .unwrap(),
+    );
+}
+
+#[test]
+fn merges_two_cargo_tomls() {
+    let cargo_toml1 = indoc! { r#"
+    [package]
+    name = "blepper"
+    version = "1.0.0"
+
+    [dependencies]
+    lazy_static = { version = "1" }
+    num_enum = { version = "0.5", features = ["complex-expressions"] }
+    serde = { version = "1", default-features = false, features = ["derive"] }
+    "# };
+
+    let cargo_toml2 = indoc! { r#"
+    [package]
+    name = "mlemer"
+    version = "2.0.0"
+
+    [dependencies]
+    lazy_static = { version = "1.1" }
+    maplit = "1.0.1"
+    serde = { version = "1.0.57", features = ["rc"] }
+    "# };
+
+    let cargo_tomls = btreemap! {
+       "//a:Cargo.toml" => cargo_toml1,
+       "//b:Cargo.toml" => cargo_toml2,
+    };
+
+    let want_deps = indoc! {r#"
+    lazy_static = { version = ">=1.0.0, <2.0.0, >=1.1.0, <1.2.0", default-features = true, features = [] }
+    maplit = { version = ">=1.0.1, <2.0.0", default-features = true, features = [] }
+    num_enum = { version = ">=0.5.0, <0.6.0", default-features = true, features = ["complex-expressions"] }
+    serde = { version = ">=1.0.0, <2.0.0, >=1.0.57, <2.0.0", default-features = true, features = ["derive", "rc"] }
+    "#};
+
+    let want_labels_to_deps = btreemap! {
+        "//a:Cargo.toml" => btreeset!{
+            "lazy_static",
+            "num_enum",
+            "serde",
+        },
+        "//b:Cargo.toml" => btreeset!{
+            "lazy_static",
+            "maplit",
+            "serde",
+        }
+    };
+
+    test(cargo_tomls, vec![], want_deps, want_labels_to_deps);
+}
+
+#[test]
+fn fails_to_merge_semver_and_git() {
+    let cargo_toml1 = indoc! { r#"
+    [package]
+    name = "blepper"
+    version = "1.0.0"
+
+    [dependencies]
+    lazy_static = { version = "42" }
+    "# };
+
+    let cargo_toml2 = indoc! { r#"
+    [package]
+    name = "mlemer"
+    version = "2.0.0"
+
+    [dependencies]
+    lazy_static = { git = "https://github.com/rust-lang-nursery/lazy-static.rs.git" }
+    "# };
+
+    let cargo_tomls = btreemap! {
+       "//a:Cargo.toml" => cargo_toml1,
+       "//b:Cargo.toml" => cargo_toml2,
+    };
+
+    let err = format!("{:?}", expect_err(cargo_tomls, vec![]));
+
+    assert_that(&err).starts_with("Failed to merge multiple dependencies on lazy_static");
+    assert_that(&err).contains("Can't merge semver and git versions of the same dependency");
+    assert_that(&err).contains("42");
+    assert_that(&err).contains("https://github.com/rust-lang-nursery/lazy-static.rs.git");
+}
+
+#[test]
+fn fails_to_merge_different_git() {
+    let cargo_toml1 = indoc! { r#"
+    [package]
+    name = "blepper"
+    version = "1.0.0"
+
+    [dependencies]
+    lazy_static = { git = "https://github.com/some-fork/lazy-static.rs.git" }
+    "# };
+
+    let cargo_toml2 = indoc! { r#"
+    [package]
+    name = "mlemer"
+    version = "2.0.0"
+
+    [dependencies]
+    lazy_static = { git = "https://github.com/rust-lang-nursery/lazy-static.rs.git" }
+    "# };
+
+    let cargo_tomls = btreemap! {
+       "//a:Cargo.toml" => cargo_toml1,
+       "//b:Cargo.toml" => cargo_toml2,
+    };
+
+    let err = format!("{:?}", expect_err(cargo_tomls, vec![]));
+
+    assert_that(&err).starts_with("Failed to merge multiple dependencies on lazy_static");
+    assert_that(&err).contains("Can't merge different git versions of the same dependency");
+    assert_that(&err).contains("https://github.com/some-fork/lazy-static.rs.git");
+    assert_that(&err).contains("https://github.com/rust-lang-nursery/lazy-static.rs.git");
+}
+
+#[test]
+fn can_have_just_packages() {
+    let packages = vec![Package {
+        name: String::from("serde"),
+        semver: VersionReq::parse("^1").unwrap(),
+        features: vec![String::from("derive")],
+    }];
+
+    let want_deps = indoc! {r#"
+    serde = { version = ">=1.0.0, <2.0.0", default-features = true, features = ["derive"] }
+    "#};
+
+    let want_labels_to_deps = BTreeMap::new();
+
+    test(BTreeMap::new(), packages, want_deps, want_labels_to_deps);
+}
+
+#[test]
+fn can_add_packages() {
+    let cargo_toml = indoc! { r#"
+    [package]
+    name = "frobber"
+    version = "0.1.0"
+
+    [dependencies]
+    # Normalises string or map values
+    lazy_static = { version = "1" }
+    "# };
+
+    let cargo_tomls = btreemap! { "//some:Cargo.toml" => cargo_toml };
+
+    let packages = vec![Package {
+        name: String::from("serde"),
+        semver: VersionReq::parse("^1.0.57").unwrap(),
+        features: vec![String::from("derive")],
+    }];
+
+    let want_deps = indoc! {r#"
+    lazy_static = { version = ">=1.0.0, <2.0.0", default-features = true, features = [] }
+    serde = { version = ">=1.0.57, <2.0.0", default-features = true, features = ["derive"] }
+    "#};
+
+    let want_labels_to_deps = btreemap! {
+        "//some:Cargo.toml" => btreeset!{
+            "lazy_static",
+        },
+    };
+
+    test(cargo_tomls, packages, want_deps, want_labels_to_deps);
+}
+
+#[test]
+fn package_conflicts_are_errors() {
+    let cargo_toml = indoc! { r#"
+    [package]
+    name = "frobber"
+    version = "0.1.0"
+
+    [dependencies]
+    # Normalises string or map values
+    lazy_static = { version = "1" }
+    "# };
+
+    let cargo_tomls = btreemap! { "//some:Cargo.toml" => cargo_toml };
+
+    let packages = vec![Package {
+        name: String::from("lazy_static"),
+        semver: VersionReq::parse("^1").unwrap(),
+        features: vec![],
+    }];
+
+    let err = expect_err(cargo_tomls, packages);
+
+    assert_eq!(
+        String::from("The following package was provided both in a Cargo.toml and in the crate_universe repository rule: lazy_static."),
+        format!("{}", err)
+    );
+}
+
+#[test]
+fn applies_overrides() {}
+
+fn test(
+    input: BTreeMap<&str, &str>,
+    additional_packages: Vec<Package>,
+    want_deps: &str,
+    want_labels_to_deps: BTreeMap<&str, BTreeSet<&str>>,
+) -> toml::Value {
+    let labels_to_cargo_tomls = write_cargo_tomls_to_disk(input);
+
+    let (merged_cargo_toml, labels_to_deps) = merge_cargo_tomls(
+        labels_to_cargo_tomls
+            .iter()
+            .map(|(label, file)| (label.clone(), file.path().to_owned()))
+            .collect(),
+        additional_packages,
+    )
+    .unwrap();
+
+    let value = toml::Value::from(merged_cargo_toml);
+    assert_eq!(
+        value.as_table().unwrap().get("dependencies").unwrap(),
+        &want_deps.parse::<toml::Value>().unwrap(),
+    );
+
+    assert_eq!(
+        labels_to_deps,
+        want_labels_to_deps
+            .into_iter()
+            .map(|(k, vs)| (k.to_owned(), vs.into_iter().map(|v| v.to_owned()).collect()))
+            .collect()
+    );
+
+    value
+}
+
+fn expect_err(
+    cargo_tomls: BTreeMap<&str, &str>,
+    additional_packages: Vec<Package>,
+) -> anyhow::Error {
+    let labels_to_cargo_tomls = write_cargo_tomls_to_disk(cargo_tomls);
+
+    merge_cargo_tomls(
+        labels_to_cargo_tomls
+            .iter()
+            .map(|(label, file)| (label.clone(), file.path().to_owned()))
+            .collect(),
+        additional_packages,
+    )
+    .expect_err("Want error")
+}
+
+fn write_cargo_tomls_to_disk(input: BTreeMap<&str, &str>) -> BTreeMap<String, NamedTempFile> {
+    input
+        .into_iter()
+        .map(|(label, cargo_toml)| {
+            (
+                label.to_owned(),
+                NamedTempFile::with_str_content("Cargo.toml", cargo_toml).unwrap(),
+            )
+        })
+        .collect::<BTreeMap<_, _>>()
+}
diff --git a/cargo/repositories.bzl b/cargo/repositories.bzl
new file mode 100644
index 0000000000..db8ee93add
--- /dev/null
+++ b/cargo/repositories.bzl
@@ -0,0 +1,4 @@
+load("@rules_rust//cargo:repositories_bin.bzl", "crate_universe_bin_deps")
+
+def crate_universe_deps():
+    crate_universe_bin_deps()
diff --git a/cargo/repositories_bin.bzl b/cargo/repositories_bin.bzl
new file mode 100644
index 0000000000..7d9dc659ef
--- /dev/null
+++ b/cargo/repositories_bin.bzl
@@ -0,0 +1,23 @@
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_file")
+load("@bazel_tools//tools/build_defs/repo:utils.bzl", "maybe")
+
+# These could perhaps be populated with pre-built versions as part of a release pipeline. Details to be discussed :)
+
+def crate_universe_bin_deps():
+    maybe(
+        http_file,
+        name = "crate_universe_resolver_linux",
+        urls = [
+            "file:///dev/null",
+        ],
+        executable = True,
+    )
+
+    maybe(
+        http_file,
+        name = "crate_universe_resolver_darwin",
+        urls = [
+            "file:///dev/null",
+        ],
+        executable = True,
+    )
diff --git a/cargo/workspace.bzl b/cargo/workspace.bzl
new file mode 100644
index 0000000000..97ccbad57a
--- /dev/null
+++ b/cargo/workspace.bzl
@@ -0,0 +1,251 @@
+DEFAULT_REPOSITORY_TEMPLATE = "https://crates.io/api/v1/crates/{crate}/{version}/download"
+
+def _crate_universe_resolve_impl(repository_ctx):
+    """Entry-point repository to manage rust dependencies.
+
+    General flow is:
+    - Serialize user-provided rule attributes into JSON
+    - Call the Rust resolver script. It writes a `defs.bzl` file in this repo containing the
+      transitive dependencies as repo rules in a `pinned_rust_install()` macro.
+    - The user then calls defs.bzl%pinned_rust_install().
+
+    Environment Variables:
+        RULES_RUST_UPDATE_CRATE_UNIVERSE_LOCKFILE: Re-pin the lockfile if `true`.
+        RULES_RUST_CRATE_UNIVERSE_RESOLVER_URL_OVERRIDE: Override URL to use to download resolver binary - for local paths use a file:// URL.
+    """
+
+    if repository_ctx.os.name == "linux":
+        toolchain_repo = "@rust_linux_x86_64"
+    elif repository_ctx.os.name == "mac os x":
+        toolchain_repo = "@rust_darwin_x86_64"
+    cargo_label = Label(toolchain_repo + "//:bin/cargo")
+    rustc_label = Label(toolchain_repo + "//:bin/rustc")
+
+    lockfile_path = None
+    if repository_ctx.attr.lockfile:
+        lockfile_path = repository_ctx.path(repository_ctx.attr.lockfile)
+
+    # Yay hand-crafted JSON serialisation...
+    input_content = """{{
+  "repository_name": {name},
+  "packages": [
+      {packages}
+  ],
+  "cargo_toml_files": {{
+      {cargo_toml_files}
+  }},
+  "overrides": {{
+      {overrides}
+  }},
+  "repository_template": "{repository_template}",
+  "target_triples": [
+    {targets}
+  ],
+  "cargo": "{cargo}"
+}}""".format(
+        name = "\"{}\"".format(repository_ctx.attr.name),
+        packages = ",\n".join([artifact for artifact in repository_ctx.attr.packages]),
+        cargo_toml_files = ",\n".join(['"{}": "{}"'.format(ct, repository_ctx.path(ct)) for ct in repository_ctx.attr.cargo_toml_files]),
+        overrides = ",\n".join(["\"{}\": {}".format(oname, ovalue) for (oname, ovalue) in repository_ctx.attr.overrides.items()]),
+        repository_template = repository_ctx.attr.repository_template,
+        targets = ",\n".join(['"{}"'.format(target) for target in repository_ctx.attr.supported_targets]),
+        cargo = repository_ctx.path(cargo_label),
+    )
+
+    input_path = "_{name}.json".format(name = repository_ctx.attr.name)
+
+    # For debugging or working on changes to the resolver, you can set something like:
+    #   export RULES_RUST_RESOLVER_URL_OVERRIDE=file:///path/to/rules_rust/cargo/crate_universe_resolver/target/release/resolver
+    resolver_url = repository_ctx.os.environ.get("RULES_RUST_CRATE_UNIVERSE_RESOLVER_URL_OVERRIDE", None)
+    if resolver_url and resolver_url.startswith("file://"):
+        sha256_result = repository_ctx.execute(["sha256sum", resolver_url[7:]])
+        resolver_sha = sha256_result.stdout[:64]
+
+        resolver_path = repository_ctx.path("resolver")
+        repository_ctx.download(
+            url = resolver_url,
+            sha256 = resolver_sha,
+            output = resolver_path,
+            executable = True,
+        )
+    else:
+        # TODO: Avoid downloading both the linux and darwin one each time.
+        if repository_ctx.os.name == "linux":
+            resolver_path = repository_ctx.path(repository_ctx.attr._resolver_script_linux)
+        elif repository_ctx.os.name == "mac os x":
+            resolver_path = repository_ctx.path(repository_ctx.attr._resolver_script_darwin)
+
+    repository_ctx.file(input_path, content = input_content)
+
+    args = [
+        resolver_path,
+        "--input_path",
+        input_path,
+        "--output_path",
+        repository_ctx.path("defs.bzl"),
+        "--repo-name",
+        repository_ctx.attr.name,
+    ]
+    if lockfile_path != None:
+        args.append("--lockfile")
+        str(args.append(lockfile_path))
+    if repository_ctx.os.environ.get("RULES_RUST_UPDATE_CRATE_UNIVERSE_LOCKFILE", "false") == "true":
+        args.append("--update-lockfile")
+
+    path_binaries = [
+        repository_ctx.path(rustc_label),
+    ]
+
+    result = repository_ctx.execute(
+        args,
+        environment = {
+            "RUST_LOG": "info",
+
+            # The resolver invokes `cargo metadata` which relies on `rustc` being on the $PATH
+            "PATH": ":".join([str(b.dirname) for b in path_binaries]),
+        },
+    )
+    repository_ctx.delete(input_path)
+    if result.stderr:
+        print("Output from resolver: " + result.stderr)
+    if result.return_code != 0:
+        fail("Error resolving deps:\n" + result.stdout + "\n" + result.stderr)
+
+    repository_ctx.file("BUILD.bazel")
+
+_crate_universe_resolve = repository_rule(
+    implementation = _crate_universe_resolve_impl,
+    attrs = {
+        "packages": attr.string_list(allow_empty = True),
+        "cargo_toml_files": attr.label_list(),
+        "overrides": attr.string_dict(doc = """Mapping of crate name to crate.override(...) entries)
+
+Example:
+
+    load("@rules_rust//cargo:workspace.bzl", "rust_library", "crate")
+
+    rust_library(
+        name = "mylib",
+        # [...]
+        overrides = {
+            "tokio": crate.override(
+                extra_rust_env_vars = {
+                    "MY_ENV_VAR": "MY_ENV_VALUE",
+                },
+                extra_build_script_env_vars = {
+                    "MY_BUILD_SCRIPT_ENV_VAR": "MY_ENV_VALUE",
+                },
+                extra_bazel_deps = {
+                    # Extra dependencies are per target. They are additive.
+                    "cfg(unix)": ["@somerepo//:foo"],  # cfg() predicate.
+                    "x86_64-apple-darwin": ["@somerepo//:bar"],  # Specific triple.
+                    "cfg(all())": ["@somerepo//:baz"],  # Applies to all targets ("regular dependency").
+                },
+                extra_build_script_bazel_deps = {
+                    # Extra dependencies are per target. They are additive.
+                    "cfg(unix)": ["@buildscriptdep//:foo"],
+                    "x86_64-apple-darwin": ["@buildscriptdep//:bar"],
+                    "cfg(all())": ["@buildscriptdep//:baz"],
+                },
+                extra_bazel_data_deps = {
+                    # ...
+                },
+                extra_build_script_bazel_data_deps = {
+                    # ...
+                },
+            ),
+        },
+    )
+
+"""),
+        "repository_template": attr.string(),
+        "supported_targets": attr.string_list(allow_empty = False),
+        "lockfile": attr.label(
+            allow_single_file = True,
+            mandatory = False,
+        ),
+        "_resolver_script_linux": attr.label(
+            default = "@crate_universe_resolver_linux//file:downloaded",
+            executable = True,
+            cfg = "host",
+        ),
+        "_resolver_script_darwin": attr.label(
+            default = "@crate_universe_resolver_darwin//file:downloaded",
+            executable = True,
+            cfg = "host",
+        ),
+    },
+    local = True,
+)
+
+def crate_universe(
+        name,
+        packages = [],
+        cargo_toml_files = [],
+        overrides = {},
+        repository_template = None,
+        supported_targets = [],
+        lockfile = None):
+    _crate_universe_resolve(
+        name = name,
+        packages = [package.to_json() for package in packages],
+        cargo_toml_files = [_absolutify(label) for label in cargo_toml_files],
+        overrides = dict([(k, v.to_json()) for (k, v) in overrides.items()]),
+        repository_template = repository_template if repository_template else DEFAULT_REPOSITORY_TEMPLATE,
+        supported_targets = supported_targets,
+        lockfile = lockfile,
+    )
+
+def _absolutify(label):
+    if label.startswith("//") or label.startswith("@"):
+        return label
+    if label.startswith(":"):
+        return "//" + native.package_name() + label
+    return "//" + native.package_name() + ":" + label
+
+def _spec(
+        name,
+        semver,
+        features = None):
+    return struct(
+        name = name,
+        semver = semver,
+        features = features if features else [],
+    )
+
+def _override(
+        extra_rust_env_vars = None,
+        extra_build_script_env_vars = None,
+        extra_bazel_deps = None,
+        extra_build_script_bazel_deps = None,
+        extra_bazel_data_deps = None,
+        extra_build_script_bazel_data_deps = None,
+        features_to_remove = []):
+    for (dep_key, dep_val) in [
+        (extra_bazel_deps, extra_bazel_deps),
+        (extra_build_script_bazel_deps, extra_build_script_bazel_deps),
+        (extra_bazel_data_deps, extra_bazel_data_deps),
+        (extra_build_script_bazel_data_deps, extra_build_script_bazel_data_deps),
+    ]:
+        if dep_val != None:
+            if not type(dep_val) == "dict":
+                fail("The {} attribute should be a dictionary".format(dep_key))
+
+            for target, deps in dep_val.items():
+                if not type(deps) == "list" or any([type(x) != "string" for x in deps]):
+                    fail("The {} values should be lists of strings".format(dep_key))
+
+    return struct(
+        extra_rust_env_vars = extra_rust_env_vars if extra_rust_env_vars else {},
+        extra_build_script_env_vars = extra_build_script_env_vars if extra_build_script_env_vars else {},
+        extra_bazel_deps = extra_bazel_deps if extra_bazel_deps else {},
+        extra_build_script_bazel_deps = extra_build_script_bazel_deps if extra_build_script_bazel_deps else {},
+        extra_bazel_data_deps = extra_bazel_data_deps if extra_bazel_data_deps else {},
+        extra_build_script_bazel_data_deps = extra_build_script_bazel_data_deps if extra_build_script_bazel_data_deps else {},
+        features_to_remove = features_to_remove,
+    )
+
+crate = struct(
+    spec = _spec,
+    override = _override,
+)
diff --git a/examples/crate_universe/basic/BUILD.bazel b/examples/crate_universe/basic/BUILD.bazel
new file mode 100644
index 0000000000..09ec6c8223
--- /dev/null
+++ b/examples/crate_universe/basic/BUILD.bazel
@@ -0,0 +1,21 @@
+load(
+    "@rules_rust//rust:rust.bzl",
+    "rust_binary",
+)
+load("@crate_universe_basic_rust_deps//:defs.bzl", "crate")
+
+rust_binary(
+    name = "basic",
+    srcs = ["src/main.rs"],
+    edition = "2018",
+    deps = [
+        crate("lazy_static"),
+    ],
+)
+
+sh_test(
+    name = "test",
+    srcs = ["test.sh"],
+    data = [":basic"],
+    args = ["$(location :basic)"],
+)
diff --git a/examples/crate_universe/basic/src/main.rs b/examples/crate_universe/basic/src/main.rs
new file mode 100644
index 0000000000..4a5afd44b5
--- /dev/null
+++ b/examples/crate_universe/basic/src/main.rs
@@ -0,0 +1,17 @@
+use lazy_static::lazy_static;
+use std::collections::HashMap;
+
+lazy_static! {
+    static ref HASHMAP: HashMap<&'static str, &'static str> = {
+        let mut m = HashMap::new();
+        m.insert("Gibson", "Fahnestock");
+        m.insert("Romain", "Chossart");
+        m.insert("Daniel", "Wagner-Hall");
+        m
+    };
+}
+
+fn main() {
+    assert_eq!(HASHMAP["Daniel"], "Wagner-Hall");
+    println!("It worked!");
+}
diff --git a/examples/crate_universe/basic/test.sh b/examples/crate_universe/basic/test.sh
new file mode 100755
index 0000000000..b2e2b6de4b
--- /dev/null
+++ b/examples/crate_universe/basic/test.sh
@@ -0,0 +1,4 @@
+#!/bin/bash -eu
+
+out="$("$1")"
+[[ "${out}" == "It worked!" ]] || { echo "Unexpected output: ${out}"; exit 1; }
diff --git a/examples/crate_universe/has_aliased_deps/BUILD.bazel b/examples/crate_universe/has_aliased_deps/BUILD.bazel
new file mode 100644
index 0000000000..65817354fe
--- /dev/null
+++ b/examples/crate_universe/has_aliased_deps/BUILD.bazel
@@ -0,0 +1,21 @@
+load(
+    "@rules_rust//rust:rust.bzl",
+    "rust_binary",
+)
+load("@crate_universe_has_aliased_deps_rust_deps//:defs.bzl", "crate")
+
+rust_binary(
+    name = "has_aliased_deps",
+    srcs = ["src/bin.rs"],
+    crate_type = "bin",
+    edition = "2018",
+    deps = [
+        crate("reqwest"),
+    ],
+)
+
+sh_test(
+    name = "test",
+    srcs = ["test.sh"],
+    data = [":has_aliased_deps"],
+)
diff --git a/examples/crate_universe/has_aliased_deps/Cargo.lock b/examples/crate_universe/has_aliased_deps/Cargo.lock
new file mode 100644
index 0000000000..4f1e18c507
--- /dev/null
+++ b/examples/crate_universe/has_aliased_deps/Cargo.lock
@@ -0,0 +1,1068 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "autocfg"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
+
+[[package]]
+name = "base64"
+version = "0.12.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3441f0f7b02788e948e47f457ca01f1d7e6d92c693bc132c22b087d3141c03ff"
+
+[[package]]
+name = "bitflags"
+version = "1.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
+
+[[package]]
+name = "bumpalo"
+version = "3.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2e8c087f005730276d1096a652e92a8bacee2e2472bcc9715a74d2bec38b5820"
+
+[[package]]
+name = "bytes"
+version = "0.5.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0e4cec68f03f32e44924783795810fa50a7035d8c8ebe78580ad7e6c703fba38"
+
+[[package]]
+name = "cc"
+version = "1.0.60"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ef611cc68ff783f18535d77ddd080185275713d852c4f5cbb6122c462a7a825c"
+
+[[package]]
+name = "cfg-if"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
+
+[[package]]
+name = "core-foundation"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "57d24c7a13c43e870e37c1556b74555437870a04514f7685f5b354e090567171"
+dependencies = [
+ "core-foundation-sys",
+ "libc",
+]
+
+[[package]]
+name = "core-foundation-sys"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b3a71ab494c0b5b860bdc8407ae08978052417070c2ced38573a9157ad75b8ac"
+
+[[package]]
+name = "dtoa"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "134951f4028bdadb9b84baf4232681efbf277da25144b9b0ad65df75946c422b"
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diff --git a/examples/crate_universe/has_aliased_deps/Cargo.toml b/examples/crate_universe/has_aliased_deps/Cargo.toml
new file mode 100644
index 0000000000..d867d884c5
--- /dev/null
+++ b/examples/crate_universe/has_aliased_deps/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "has_aliased_deps"
+version = "0.1.0"
+authors = ["Daniel Wagner-Hall <dwagnerhall@apple.com>"]
+edition = "2018"
+
+[dependencies]
+reqwest = { version = "0.10.7", features = ["blocking", "json"] }
diff --git a/examples/crate_universe/has_aliased_deps/openssl.BUILD b/examples/crate_universe/has_aliased_deps/openssl.BUILD
new file mode 100644
index 0000000000..de4b3e29ff
--- /dev/null
+++ b/examples/crate_universe/has_aliased_deps/openssl.BUILD
@@ -0,0 +1,51 @@
+load("@rules_foreign_cc//tools/build_defs:configure.bzl", "configure_make")
+
+config_setting(
+    name = "darwin",
+    values = {"cpu": "darwin"},
+    visibility = ["//visibility:public"],
+)
+
+config_setting(
+    name = "linux",
+    values = {"cpu": "k8"},
+    visibility = ["//visibility:public"],
+)
+
+filegroup(
+    name = "srcs",
+    srcs = glob(
+        ["**"],
+        exclude = ["BUILD.bazel"],
+    ),
+)
+
+configure_make(
+    name = "openssl",
+    configure_command = "config",
+    configure_env_vars = select({
+        # On Darwin, the cc_toolchain uses libtool instead of ar, but these do not take compatible arguments.
+        # By default it will set AR to point at libtool.
+        # So set AR to an empty value so that Darwin falls back to the system-default ar instead.
+        ":darwin": {
+            "AR": "",
+        },
+        ":linux": {},
+    }),
+    lib_source = ":srcs",
+    shared_libraries = select({
+        ":darwin": [
+            "libcrypto.dylib",
+            "libssl.dylib",
+        ],
+        ":linux": [
+            "libcrypto.so",
+            "libssl.so",
+        ],
+    }),
+    static_libraries = [
+        "libcrypto.a",
+        "libssl.a",
+    ],
+    visibility = ["//visibility:public"],
+)
diff --git a/examples/crate_universe/has_aliased_deps/src/bin.rs b/examples/crate_universe/has_aliased_deps/src/bin.rs
new file mode 100644
index 0000000000..f328e4d9d0
--- /dev/null
+++ b/examples/crate_universe/has_aliased_deps/src/bin.rs
@@ -0,0 +1 @@
+fn main() {}
diff --git a/examples/crate_universe/has_aliased_deps/test.sh b/examples/crate_universe/has_aliased_deps/test.sh
new file mode 100755
index 0000000000..593ab27984
--- /dev/null
+++ b/examples/crate_universe/has_aliased_deps/test.sh
@@ -0,0 +1,3 @@
+#!/bin/bash -eux
+
+true
diff --git a/examples/crate_universe/uses_proc_macro/BUILD.bazel b/examples/crate_universe/uses_proc_macro/BUILD.bazel
new file mode 100644
index 0000000000..ffd022877d
--- /dev/null
+++ b/examples/crate_universe/uses_proc_macro/BUILD.bazel
@@ -0,0 +1,22 @@
+load(
+    "@rules_rust//rust:rust.bzl",
+    "rust_binary",
+)
+
+load("@crate_universe_uses_proc_macro_rust_deps//:defs.bzl", "crate")
+
+rust_binary(
+    name = "uses_proc_macro",
+    srcs = ["src/main.rs"],
+    edition = "2018",
+    deps = [
+        crate("structopt"),
+    ],
+)
+
+sh_test(
+    name = "test",
+    srcs = ["test.sh"],
+    args = ["$(location :uses_proc_macro)"],
+    data = [":uses_proc_macro"],
+)
diff --git a/examples/crate_universe/uses_proc_macro/Cargo.lock b/examples/crate_universe/uses_proc_macro/Cargo.lock
new file mode 100644
index 0000000000..2234641acc
--- /dev/null
+++ b/examples/crate_universe/uses_proc_macro/Cargo.lock
@@ -0,0 +1,223 @@
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+
+[[package]]
+name = "strsim"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
+
+[[package]]
+name = "structopt"
+version = "0.3.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6cc388d94ffabf39b5ed5fadddc40147cb21e605f53db6f8f36a625d27489ac5"
+dependencies = [
+ "clap",
+ "lazy_static",
+ "structopt-derive",
+]
+
+[[package]]
+name = "structopt-derive"
+version = "0.4.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5e2513111825077552a6751dfad9e11ce0fba07d7276a3943a037d7e93e64c5f"
+dependencies = [
+ "heck",
+ "proc-macro-error",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "syn"
+version = "1.0.41"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6690e3e9f692504b941dc6c3b188fd28df054f7fb8469ab40680df52fdcc842b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-xid",
+]
+
+[[package]]
+name = "textwrap"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d326610f408c7a4eb6f51c37c330e496b08506c9457c9d34287ecc38809fb060"
+dependencies = [
+ "unicode-width",
+]
+
+[[package]]
+name = "unicode-segmentation"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e83e153d1053cbb5a118eeff7fd5be06ed99153f00dbcd8ae310c5fb2b22edc0"
+
+[[package]]
+name = "unicode-width"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9337591893a19b88d8d87f2cec1e73fad5cdfd10e5a6f349f498ad6ea2ffb1e3"
+
+[[package]]
+name = "unicode-xid"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
+
+[[package]]
+name = "uses_proc_macro"
+version = "0.1.0"
+dependencies = [
+ "structopt",
+]
+
+[[package]]
+name = "vec_map"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f1bddf1187be692e79c5ffeab891132dfb0f236ed36a43c7ed39f1165ee20191"
+
+[[package]]
+name = "version_check"
+version = "0.9.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b5a972e5669d67ba988ce3dc826706fb0a8b01471c088cb0b6110b805cc36aed"
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
diff --git a/examples/crate_universe/uses_proc_macro/Cargo.toml b/examples/crate_universe/uses_proc_macro/Cargo.toml
new file mode 100644
index 0000000000..4ef2d186ea
--- /dev/null
+++ b/examples/crate_universe/uses_proc_macro/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "uses_proc_macro"
+version = "0.1.0"
+authors = ["Daniel Wagner-Hall <dwagnerhall@apple.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+structopt = "=0.3.17"
diff --git a/examples/crate_universe/uses_proc_macro/src/main.rs b/examples/crate_universe/uses_proc_macro/src/main.rs
new file mode 100644
index 0000000000..90ab63cd60
--- /dev/null
+++ b/examples/crate_universe/uses_proc_macro/src/main.rs
@@ -0,0 +1,12 @@
+use structopt::StructOpt;
+
+#[derive(StructOpt)]
+struct Opt {
+    #[structopt(long)]
+    name: String
+}
+
+fn main() {
+    let opt = Opt::from_args();
+    println!("Greetings, {}", opt.name);
+}
diff --git a/examples/crate_universe/uses_proc_macro/test.sh b/examples/crate_universe/uses_proc_macro/test.sh
new file mode 100755
index 0000000000..a25c039dca
--- /dev/null
+++ b/examples/crate_universe/uses_proc_macro/test.sh
@@ -0,0 +1,3 @@
+#!/bin/bash -eux
+
+[[ "$("${1}" --name Gibson)" == "Greetings, Gibson" ]] || exit 1
diff --git a/examples/crate_universe/uses_sys_crate/BUILD.bazel b/examples/crate_universe/uses_sys_crate/BUILD.bazel
new file mode 100644
index 0000000000..5c7a0c11e2
--- /dev/null
+++ b/examples/crate_universe/uses_sys_crate/BUILD.bazel
@@ -0,0 +1,22 @@
+package(default_visibility = ["//visibility:public"])
+
+load(
+    "@rules_rust//rust:rust.bzl",
+    "rust_binary",
+)
+load("@crate_universe_uses_sys_crate_rust_deps//:defs.bzl", "crate")
+
+rust_binary(
+    name = "uses_sys_crate",
+    srcs = ["src/main.rs"],
+    edition = "2018",
+    deps = [crate("bzip2")],
+)
+
+sh_test(
+    name = "test",
+    size = "small",
+    srcs = ["test.sh"],
+    args = ["$(location :uses_sys_crate)"],
+    data = [":uses_sys_crate"],
+)
diff --git a/examples/crate_universe/uses_sys_crate/Cargo.lock b/examples/crate_universe/uses_sys_crate/Cargo.lock
new file mode 100644
index 0000000000..2885782129
--- /dev/null
+++ b/examples/crate_universe/uses_sys_crate/Cargo.lock
@@ -0,0 +1,47 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "bzip2"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "42b7c3cbf0fa9c1b82308d57191728ca0256cb821220f4e2fd410a72ade26e3b"
+dependencies = [
+ "bzip2-sys",
+ "libc",
+]
+
+[[package]]
+name = "bzip2-sys"
+version = "0.1.9+1.0.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ad3b39a260062fca31f7b0b12f207e8f2590a67d32ec7d59c20484b07ea7285e"
+dependencies = [
+ "cc",
+ "libc",
+ "pkg-config",
+]
+
+[[package]]
+name = "cc"
+version = "1.0.59"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "66120af515773fb005778dc07c261bd201ec8ce50bd6e7144c927753fe013381"
+
+[[package]]
+name = "libc"
+version = "0.2.77"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f2f96b10ec2560088a8e76961b00d47107b3a625fecb76dedb29ee7ccbf98235"
+
+[[package]]
+name = "pkg-config"
+version = "0.3.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d36492546b6af1463394d46f0c834346f31548646f6ba10849802c9c9a27ac33"
+
+[[package]]
+name = "uses_sys_crate"
+version = "0.1.0"
+dependencies = [
+ "bzip2",
+]
diff --git a/examples/crate_universe/uses_sys_crate/Cargo.toml b/examples/crate_universe/uses_sys_crate/Cargo.toml
new file mode 100644
index 0000000000..a9068d34ff
--- /dev/null
+++ b/examples/crate_universe/uses_sys_crate/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "uses_sys_crate"
+version = "0.1.0"
+authors = ["Daniel Wagner-Hall <dwagnerhall@apple.com>"]
+edition = "2018"
+
+[dependencies]
+bzip2 = "0.3.3"
diff --git a/examples/crate_universe/uses_sys_crate/lockfile.lock b/examples/crate_universe/uses_sys_crate/lockfile.lock
new file mode 100644
index 0000000000..f6d25611c6
--- /dev/null
+++ b/examples/crate_universe/uses_sys_crate/lockfile.lock
@@ -0,0 +1,550 @@
+# rules_rust crate_universe file format 1
+# config hash d555ad6fce4572c24cb874f784ca32c0b4c5c6b6655c759f6b1381c0ef72667a
+
+load("@bazel_tools//tools/build_defs/repo:git.bzl", "new_git_repository")
+
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+def pinned_rust_install():
+    http_archive(
+        name = "crate_universe_uses_sys_crate_rust_deps__bzip2__0_3_3",
+        # TODO: Allow configuring where rust_library comes from
+        build_file_content = """# buildifier: disable=load
+load(
+    "@rules_rust//rust:rust.bzl",
+    "rust_binary",
+    "rust_library",
+    "rust_test",
+)
+
+# buildifier: disable=load
+load("@bazel_skylib//lib:selects.bzl", "selects")
+
+package(default_visibility = [
+    "//visibility:public",
+])
+
+licenses([
+    "notice",  # MIT from expression "MIT OR Apache-2.0"
+])
+
+# Generated targets
+
+# buildifier: leave-alone
+rust_library(
+    name = "bzip2",
+    crate_type = "lib",
+    deps = [
+        "@crate_universe_uses_sys_crate_rust_deps__bzip2_sys__0_1_10_1_0_8//:bzip2_sys",
+        "@crate_universe_uses_sys_crate_rust_deps__libc__0_2_76//:libc",
+    ],
+    srcs = glob(["**/*.rs"]),
+    crate_root = "src/lib.rs",
+    edition = "2015",
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    data = glob(["**"], exclude=[
+        # These can be manually added with overrides if needed.
+
+        # If you run `cargo build` in this dir, the target dir can get very big very quick.
+        "target/**",
+
+        # These are not vendored from the crate - we exclude them to avoid busting caches
+        # when we change how we generate BUILD files and such.
+        "BUILD.bazel",
+        "WORKSPACE.bazel",
+        "WORKSPACE",
+    ]),
+    version = "0.3.3",
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    crate_features = [
+    ],
+    aliases = select({
+        # Default
+        "//conditions:default": {
+        },
+    }),
+)
+# Unsupported target "tokio" with type "test" omitted
+""",
+        sha256 = "42b7c3cbf0fa9c1b82308d57191728ca0256cb821220f4e2fd410a72ade26e3b",
+        strip_prefix = "bzip2-0.3.3",
+        type = "tar.gz",
+        url = "https://crates.io/api/v1/crates/bzip2/0.3.3/download",
+    )
+
+    http_archive(
+        name = "crate_universe_uses_sys_crate_rust_deps__bzip2_sys__0_1_10_1_0_8",
+        # TODO: Allow configuring where rust_library comes from
+        build_file_content = """# buildifier: disable=load
+load(
+    "@rules_rust//rust:rust.bzl",
+    "rust_binary",
+    "rust_library",
+    "rust_test",
+)
+
+# buildifier: disable=load
+load("@bazel_skylib//lib:selects.bzl", "selects")
+
+package(default_visibility = [
+    "//visibility:public",
+])
+
+licenses([
+    "notice",  # MIT from expression "MIT OR Apache-2.0"
+])
+
+# Generated targets
+# buildifier: disable=load-on-top
+load(
+    "@rules_rust//cargo:cargo_build_script.bzl",
+    "cargo_build_script",
+)
+
+# buildifier: leave-alone
+cargo_build_script(
+    name = "bzip2_sys_build_script",
+    srcs = glob(["**/*.rs"]),
+    crate_root = "build.rs",
+    edition = "2015",
+    deps = [
+        "@crate_universe_uses_sys_crate_rust_deps__cc__1_0_66//:cc",
+        "@crate_universe_uses_sys_crate_rust_deps__pkg_config__0_3_19//:pkg_config",
+    ],
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    crate_features = [
+    ],
+    build_script_env = {
+    },
+    links = "bzip2",
+    data = glob(["**"], exclude=[
+        # These can be manually added with overrides if needed.
+
+        # If you run `cargo build` in this dir, the target dir can get very big very quick.
+        "target/**",
+
+        # These are not vendored from the crate - we exclude them to avoid busting caches
+        # when we change how we generate BUILD files and such.
+        "BUILD.bazel",
+        "WORKSPACE.bazel",
+        "WORKSPACE",
+    ]),
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    version = "0.1.10+1.0.8",
+    visibility = ["//visibility:private"],
+)
+
+
+# buildifier: leave-alone
+rust_library(
+    name = "bzip2_sys",
+    crate_type = "lib",
+    deps = [
+        ":bzip2_sys_build_script",
+        "@crate_universe_uses_sys_crate_rust_deps__libc__0_2_76//:libc",
+    ],
+    srcs = glob(["**/*.rs"]),
+    crate_root = "lib.rs",
+    edition = "2015",
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    data = glob(["**"], exclude=[
+        # These can be manually added with overrides if needed.
+
+        # If you run `cargo build` in this dir, the target dir can get very big very quick.
+        "target/**",
+
+        # These are not vendored from the crate - we exclude them to avoid busting caches
+        # when we change how we generate BUILD files and such.
+        "BUILD.bazel",
+        "WORKSPACE.bazel",
+        "WORKSPACE",
+    ]),
+    version = "0.1.10+1.0.8",
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    crate_features = [
+    ],
+    aliases = select({
+        # Default
+        "//conditions:default": {
+        },
+    }),
+)
+""",
+        sha256 = "17fa3d1ac1ca21c5c4e36a97f3c3eb25084576f6fc47bf0139c1123434216c6c",
+        strip_prefix = "bzip2-sys-0.1.10+1.0.8",
+        type = "tar.gz",
+        url = "https://crates.io/api/v1/crates/bzip2-sys/0.1.10+1.0.8/download",
+    )
+
+    http_archive(
+        name = "crate_universe_uses_sys_crate_rust_deps__cc__1_0_66",
+        # TODO: Allow configuring where rust_library comes from
+        build_file_content = """# buildifier: disable=load
+load(
+    "@rules_rust//rust:rust.bzl",
+    "rust_binary",
+    "rust_library",
+    "rust_test",
+)
+
+# buildifier: disable=load
+load("@bazel_skylib//lib:selects.bzl", "selects")
+
+package(default_visibility = [
+    "//visibility:public",
+])
+
+licenses([
+    "notice",  # MIT from expression "MIT OR Apache-2.0"
+])
+
+# Generated targets
+
+# buildifier: leave-alone
+rust_binary(
+    # Prefix bin name to disambiguate from (probable) collision with lib name
+    # N.B.: The exact form of this is subject to change.
+    name = "cargo_bin_gcc_shim",
+    deps = [
+        # Binaries get an implicit dependency on their crate's lib
+        ":cc",
+    ],
+    srcs = glob(["**/*.rs"]),
+    crate_root = "src/bin/gcc-shim.rs",
+    edition = "2018",
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    data = glob(["**"], exclude=[
+        # These can be manually added with overrides if needed.
+
+        # If you run `cargo build` in this dir, the target dir can get very big very quick.
+        "target/**",
+
+        # These are not vendored from the crate - we exclude them to avoid busting caches
+        # when we change how we generate BUILD files and such.
+        "BUILD.bazel",
+        "WORKSPACE.bazel",
+        "WORKSPACE",
+    ]),
+    version = "1.0.66",
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    crate_features = [
+    ],
+    aliases = select({
+        # Default
+        "//conditions:default": {
+        },
+    }),
+)
+
+# buildifier: leave-alone
+rust_library(
+    name = "cc",
+    crate_type = "lib",
+    deps = [
+    ],
+    srcs = glob(["**/*.rs"]),
+    crate_root = "src/lib.rs",
+    edition = "2018",
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    data = glob(["**"], exclude=[
+        # These can be manually added with overrides if needed.
+
+        # If you run `cargo build` in this dir, the target dir can get very big very quick.
+        "target/**",
+
+        # These are not vendored from the crate - we exclude them to avoid busting caches
+        # when we change how we generate BUILD files and such.
+        "BUILD.bazel",
+        "WORKSPACE.bazel",
+        "WORKSPACE",
+    ]),
+    version = "1.0.66",
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    crate_features = [
+    ],
+    aliases = select({
+        # Default
+        "//conditions:default": {
+        },
+    }),
+)
+# Unsupported target "cc_env" with type "test" omitted
+# Unsupported target "cflags" with type "test" omitted
+# Unsupported target "cxxflags" with type "test" omitted
+# Unsupported target "test" with type "test" omitted
+""",
+        sha256 = "4c0496836a84f8d0495758516b8621a622beb77c0fed418570e50764093ced48",
+        strip_prefix = "cc-1.0.66",
+        type = "tar.gz",
+        url = "https://crates.io/api/v1/crates/cc/1.0.66/download",
+    )
+
+    http_archive(
+        name = "crate_universe_uses_sys_crate_rust_deps__libc__0_2_76",
+        # TODO: Allow configuring where rust_library comes from
+        build_file_content = """# buildifier: disable=load
+load(
+    "@rules_rust//rust:rust.bzl",
+    "rust_binary",
+    "rust_library",
+    "rust_test",
+)
+
+# buildifier: disable=load
+load("@bazel_skylib//lib:selects.bzl", "selects")
+
+package(default_visibility = [
+    "//visibility:public",
+])
+
+licenses([
+    "notice",  # MIT from expression "MIT OR Apache-2.0"
+])
+
+# Generated targets
+# buildifier: disable=load-on-top
+load(
+    "@rules_rust//cargo:cargo_build_script.bzl",
+    "cargo_build_script",
+)
+
+# buildifier: leave-alone
+cargo_build_script(
+    name = "libc_build_script",
+    srcs = glob(["**/*.rs"]),
+    crate_root = "build.rs",
+    edition = "2015",
+    deps = [
+    ],
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    crate_features = [
+      "default",
+      "std",
+    ],
+    build_script_env = {
+    },
+    data = glob(["**"], exclude=[
+        # These can be manually added with overrides if needed.
+
+        # If you run `cargo build` in this dir, the target dir can get very big very quick.
+        "target/**",
+
+        # These are not vendored from the crate - we exclude them to avoid busting caches
+        # when we change how we generate BUILD files and such.
+        "BUILD.bazel",
+        "WORKSPACE.bazel",
+        "WORKSPACE",
+    ]),
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    version = "0.2.76",
+    visibility = ["//visibility:private"],
+)
+
+
+# buildifier: leave-alone
+rust_library(
+    name = "libc",
+    crate_type = "lib",
+    deps = [
+        ":libc_build_script",
+    ],
+    srcs = glob(["**/*.rs"]),
+    crate_root = "src/lib.rs",
+    edition = "2015",
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    data = glob(["**"], exclude=[
+        # These can be manually added with overrides if needed.
+
+        # If you run `cargo build` in this dir, the target dir can get very big very quick.
+        "target/**",
+
+        # These are not vendored from the crate - we exclude them to avoid busting caches
+        # when we change how we generate BUILD files and such.
+        "BUILD.bazel",
+        "WORKSPACE.bazel",
+        "WORKSPACE",
+    ]),
+    version = "0.2.76",
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    crate_features = [
+        "default",
+        "std",
+    ],
+    aliases = select({
+        # Default
+        "//conditions:default": {
+        },
+    }),
+)
+# Unsupported target "const_fn" with type "test" omitted
+""",
+        sha256 = "755456fae044e6fa1ebbbd1b3e902ae19e73097ed4ed87bb79934a867c007bc3",
+        strip_prefix = "libc-0.2.76",
+        type = "tar.gz",
+        url = "https://crates.io/api/v1/crates/libc/0.2.76/download",
+    )
+
+    http_archive(
+        name = "crate_universe_uses_sys_crate_rust_deps__pkg_config__0_3_19",
+        # TODO: Allow configuring where rust_library comes from
+        build_file_content = """# buildifier: disable=load
+load(
+    "@rules_rust//rust:rust.bzl",
+    "rust_binary",
+    "rust_library",
+    "rust_test",
+)
+
+# buildifier: disable=load
+load("@bazel_skylib//lib:selects.bzl", "selects")
+
+package(default_visibility = [
+    "//visibility:public",
+])
+
+licenses([
+    "notice",  # MIT from expression "MIT OR Apache-2.0"
+])
+
+# Generated targets
+
+# buildifier: leave-alone
+rust_library(
+    name = "pkg_config",
+    crate_type = "lib",
+    deps = [
+    ],
+    srcs = glob(["**/*.rs"]),
+    crate_root = "src/lib.rs",
+    edition = "2015",
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    data = glob(["**"], exclude=[
+        # These can be manually added with overrides if needed.
+
+        # If you run `cargo build` in this dir, the target dir can get very big very quick.
+        "target/**",
+
+        # These are not vendored from the crate - we exclude them to avoid busting caches
+        # when we change how we generate BUILD files and such.
+        "BUILD.bazel",
+        "WORKSPACE.bazel",
+        "WORKSPACE",
+    ]),
+    version = "0.3.19",
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    crate_features = [
+    ],
+    aliases = select({
+        # Default
+        "//conditions:default": {
+        },
+    }),
+)
+# Unsupported target "test" with type "test" omitted
+""",
+        sha256 = "3831453b3449ceb48b6d9c7ad7c96d5ea673e9b470a1dc578c2ce6521230884c",
+        strip_prefix = "pkg-config-0.3.19",
+        type = "tar.gz",
+        url = "https://crates.io/api/v1/crates/pkg-config/0.3.19/download",
+    )
+
+
+CRATE_TARGET_NAMES = {
+    "bzip2": "@crate_universe_uses_sys_crate_rust_deps__bzip2__0_3_3//:bzip2",
+    "libc": "@crate_universe_uses_sys_crate_rust_deps__libc__0_2_76//:libc",
+}
+
+def crate(crate_name):
+    """Return the name of the target for the given crate.
+    """
+    target_name = CRATE_TARGET_NAMES.get(crate_name)
+    if target_name == None:
+        fail("Unknown crate name: {}".format(crate_name))
+    return target_name
+
+def all_deps():
+    """Return all standard dependencies explicitly listed in the Cargo.toml or packages list."""
+    return [
+        crate(crate_name) for crate_name in [
+            "bzip2",
+            "libc",
+        ]
+    ]
+
+def all_proc_macro_deps():
+    """Return all proc-macro dependencies explicitly listed in the Cargo.toml or packages list."""
+    return [
+        crate(crate_name) for crate_name in [
+        ]
+    ]
+
+def crates_from(label):
+    mapping = {
+        "@examples//crate_universe/uses_sys_crate:Cargo.toml": [crate("bzip2")],
+    }
+    return mapping[_absolutify(label)]
+
+def dev_crates_from(label):
+    mapping = {
+        "@examples//crate_universe/uses_sys_crate:Cargo.toml": [],
+    }
+    return mapping[_absolutify(label)]
+
+def build_crates_from(label):
+    mapping = {
+        "@examples//crate_universe/uses_sys_crate:Cargo.toml": [],
+    }
+    return mapping[_absolutify(label)]
+
+def proc_macro_crates_from(label):
+    mapping = {
+        "@examples//crate_universe/uses_sys_crate:Cargo.toml": [],
+    }
+    return mapping[_absolutify(label)]
+
+def _absolutify(label):
+    if label.startswith("//") or label.startswith("@"):
+        return label
+    if label.startswith(":"):
+        return "//" + native.package_name() + label
+    return "//" + native.package_name() + ":" + label
diff --git a/examples/crate_universe/uses_sys_crate/src/main.rs b/examples/crate_universe/uses_sys_crate/src/main.rs
new file mode 100644
index 0000000000..27d3e17682
--- /dev/null
+++ b/examples/crate_universe/uses_sys_crate/src/main.rs
@@ -0,0 +1,41 @@
+use bzip2::read::BzEncoder;
+use bzip2::Compression;
+use std::io::Read;
+
+fn main() {
+    let stdin = std::io::stdin();
+    let mut raw_counter = CountingStream::new(stdin);
+
+    let compressed_count = {
+        let compressor = BzEncoder::new(&mut raw_counter, Compression::Best);
+        let mut compressed_counter = CountingStream::new(compressor);
+        std::io::copy(&mut compressed_counter, &mut std::io::sink()).unwrap();
+        compressed_counter.count
+    };
+
+    println!(
+        "Compressed {} to {} bytes",
+        raw_counter.count, compressed_count
+    );
+}
+
+struct CountingStream<R: Read> {
+    stream: R,
+    count: usize,
+}
+
+impl<R: Read> CountingStream<R> {
+    fn new(stream: R) -> Self {
+        CountingStream { stream, count: 0 }
+    }
+}
+
+impl<R: Read> Read for CountingStream<R> {
+    fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
+        let result = self.stream.read(buf);
+        if let Ok(read_bytes) = result {
+            self.count += read_bytes;
+        }
+        result
+    }
+}
diff --git a/examples/crate_universe/uses_sys_crate/test.sh b/examples/crate_universe/uses_sys_crate/test.sh
new file mode 100755
index 0000000000..5e82b327dc
--- /dev/null
+++ b/examples/crate_universe/uses_sys_crate/test.sh
@@ -0,0 +1,6 @@
+#!/bin/bash -eu
+
+out="$(echo -n "Hello world" | "$1")"
+
+expected="Compressed 11 to 50 bytes"
+[[ "${out}" == ${expected} ]] || { echo "Expected '${expected}', got '${out}'"; exit 1; }
diff --git a/examples/examples_deps.bzl b/examples/examples_deps.bzl
index c669cca615..5c163c9973 100644
--- a/examples/examples_deps.bzl
+++ b/examples/examples_deps.bzl
@@ -9,10 +9,15 @@ load("@rules_rust//bindgen:repositories.bzl", "rust_bindgen_repositories")
 load("@rules_rust//proto:repositories.bzl", "rust_proto_repositories")
 load("@rules_rust//rust:repositories.bzl", "rust_repositories", "rust_repository_set")
 load("@rules_rust//wasm_bindgen:repositories.bzl", "rust_wasm_bindgen_repositories")
+load("@rules_rust//cargo:repositories.bzl", "crate_universe_deps")
+load("@rules_rust//cargo:workspace.bzl", "crate", "crate_universe")
 
-def deps():
+
+def deps(is_top_level = False):
     """Define dependencies for `rules_rust` examples"""
 
+    examples_prefix = "@examples" if is_top_level else ""
+
     rust_repositories()
 
     rust_bindgen_repositories()
@@ -53,3 +58,66 @@ def deps():
     )
 
     rules_foreign_cc_dependencies()
+
+    crate_universe_deps()
+
+    crate_universe(
+        name = "crate_universe_basic_rust_deps",
+        packages = [
+            crate.spec(
+                name = "lazy_static",
+                semver = "=1.4",
+            ),
+        ],
+        supported_targets = [
+            "x86_64-apple-darwin",
+            "x86_64-unknown-linux-gnu",
+        ],
+    )
+
+    crate_universe(
+        name = "crate_universe_uses_proc_macro_rust_deps",
+        cargo_toml_files = [examples_prefix + "//crate_universe/uses_proc_macro:Cargo.toml"],
+        supported_targets = [
+            "x86_64-apple-darwin",
+            "x86_64-unknown-linux-gnu",
+        ],
+    )
+
+    crate_universe(
+        name = "crate_universe_uses_sys_crate_rust_deps",
+        cargo_toml_files = [examples_prefix + "//crate_universe/uses_sys_crate:Cargo.toml"],
+        lockfile = examples_prefix + "//crate_universe/uses_sys_crate:lockfile.lock",
+        packages = [
+            crate.spec(
+                name = "libc",
+                semver = "=0.2.76",
+            ),
+        ],
+        supported_targets = [
+            "x86_64-apple-darwin",
+            "x86_64-unknown-linux-gnu",
+        ],
+    )
+
+    crate_universe(
+        name = "crate_universe_has_aliased_deps_rust_deps",
+        cargo_toml_files = [examples_prefix + "//crate_universe/has_aliased_deps:Cargo.toml"],
+        overrides = {
+            "openssl-sys": crate.override(
+                extra_build_script_env_vars = {
+                    "OPENSSL_DIR": "../openssl/openssl",
+                },
+                extra_bazel_deps = {
+                    "cfg(all())": ["@openssl//:openssl"],
+                },
+                extra_build_script_bazel_data_deps = {
+                    "cfg(all())": ["@openssl//:openssl"],
+                },
+            ),
+        },
+        supported_targets = [
+            "x86_64-apple-darwin",
+            "x86_64-unknown-linux-gnu",
+        ],
+    )
diff --git a/examples/examples_transitive_deps.bzl b/examples/examples_transitive_deps.bzl
index bac369466b..67410d45c8 100644
--- a/examples/examples_transitive_deps.bzl
+++ b/examples/examples_transitive_deps.bzl
@@ -8,6 +8,11 @@ load("@bazel_tools//tools/build_defs/repo:utils.bzl", "maybe")
 load("@build_bazel_rules_nodejs//:index.bzl", "node_repositories")
 load("@rules_proto//proto:repositories.bzl", "rules_proto_dependencies", "rules_proto_toolchains")
 
+load("@crate_universe_basic_rust_deps//:defs.bzl", basic_pinned_rust_install = "pinned_rust_install")
+load("@crate_universe_uses_proc_macro_rust_deps//:defs.bzl", uses_proc_macro_pinned_rust_install = "pinned_rust_install")
+load("@crate_universe_uses_sys_crate_rust_deps//:defs.bzl", uses_sys_crate_pinned_rust_install = "pinned_rust_install")
+load("@crate_universe_has_aliased_deps_rust_deps//:defs.bzl", has_aliased_deps_pinned_rust_install = "pinned_rust_install")
+
 # buildifier: disable=unnamed-macro
 def transitive_deps(is_top_level = False):
     """Define transitive dependencies for `rules_rust` examples
@@ -36,3 +41,11 @@ def transitive_deps(is_top_level = False):
         )
 
     node_repositories()
+
+    basic_pinned_rust_install()
+
+    uses_proc_macro_pinned_rust_install()
+
+    uses_sys_crate_pinned_rust_install()
+
+    has_aliased_deps_pinned_rust_install()