tuftool: Write create subcommand

Signed-off-by: iliana destroyer of worlds <iweller@amazon.com>

.gitignore

@@ -1,3 +1,2 @@
 /target
 **/*.rs.bk
-Cargo.lock

Cargo.toml

@@ -3,4 +3,9 @@ members = [
     "olpc-cjson",
     "tough",
     "tough_schema",
+    "tuftool",
 ]
+
+[profile.release]
+debug = 1
+lto = true

tuftool/Cargo.toml

@@ -0,0 +1,26 @@
+[package]
+name = "tuftool"
+version = "0.1.0"
+description = "Utility for creating and signing The Update Framework (TUF) repositories"
+authors = ["iliana destroyer of worlds <iweller@amazon.com>"]
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/awslabs/tough"
+keywords = ["tuf", "update", "repository"]
+edition = "2018"
+
+[dependencies]
+chrono = "0.4.6"
+digest = "0.8.1"
+hex = "0.3.2"
+maplit = "1.0.1"
+pem = "0.6.0"
+rayon = "1.1"
+ring = { version = "0.16.7", features = ["std"] }
+serde = "1.0.99"
+serde_json = "1.0.39"
+sha2 = "0.8.0"
+snafu = { version = "0.5.0", features = ["backtrace-crate"] }
+structopt = "0.2.18"
+tough_schema = { version = "0.1.0", path = "../tough_schema" }
+olpc-cjson = { version = "0.1.0", path = "../olpc-cjson" }
+walkdir = "2.2.9"

tuftool/src/copylike.rs

@@ -0,0 +1,50 @@
+// Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: MIT OR Apache-2.0
+
+use std::fmt::{self, Display};
+use std::fs::{self};
+use std::path::Path;
+
+#[derive(Debug, Clone, Copy)]
+pub(crate) enum Copylike {
+    Copy,
+    Hardlink,
+    Symlink,
+}
+
+impl Copylike {
+    pub(crate) fn run<P: AsRef<Path>, Q: AsRef<Path>>(self, src: P, dst: Q) -> std::io::Result<()> {
+        if let Some(parent) = dst.as_ref().parent() {
+            fs::create_dir_all(parent)?;
+        }
+        match self {
+            Copylike::Copy => fs::copy(src, dst).map(|_| ()),
+            Copylike::Hardlink => fs::hard_link(src, dst),
+            Copylike::Symlink => {
+                #[cfg(unix)]
+                {
+                    std::os::unix::fs::symlink(src, dst)
+                }
+
+                #[cfg(windows)]
+                {
+                    std::os::windows::fs::symlink_file(src, dst)
+                }
+            }
+        }
+    }
+}
+
+impl Display for Copylike {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(
+            f,
+            "{}",
+            match self {
+                Copylike::Copy => "copy",
+                Copylike::Hardlink => "hardlink",
+                Copylike::Symlink => "symlink",
+            }
+        )
+    }
+}