Simplify release

.github/workflows/release.yml

@@ -0,0 +1,27 @@
+# Cut a release whenever a new tag is pushed to the repo.
+name: Release
+
+on:
+  push:
+    tags:
+      - "v*.*.*"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: bazel test //...
+        env:
+          # Bazelisk will download bazel to here
+          XDG_CACHE_HOME: ~/.cache/bazel-repo
+        run: bazel --bazelrc=.github/workflows/ci.bazelrc --bazelrc=.bazelrc test //...
+      - name: Prepare workspace snippet
+        run: .github/workflows/workspace_snippet.sh ${{ env.GITHUB_REF_NAME }} > release_notes.txt
+      - name: Release
+        uses: softprops/action-gh-release@v1
+        with:
+          # Use GH feature to populate the changelog automatically
+          generate_release_notes: true
+          body_path: release_notes.txt

.github/workflows/workspace_snippet.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+
+set -o errexit -o nounset -o pipefail
+
+# Set by GH actions, see
+# https://docs.github.com/en/actions/learn-github-actions/environment-variables#default-environment-variables
+TAG=${GITHUB_REF_NAME}
+PREFIX="rules_python-${TAG:1}"
+SHA=$(git archive --format=tar --prefix=${PREFIX}/ ${TAG} | gzip | shasum -a 256 | awk '{print $1}')
+
+cat << EOF
+WORKSPACE setup:
+
+\`\`\`starlark
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+http_archive(
+    name = "rules_python",
+    sha256 = "${SHA}",
+    strip_prefix = "${PREFIX}",
+    url = "https://github.com/bazelbuild/rules_python/archive/${TAG}.tar.gz",
+)
+\`\`\`
+EOF

BUILD

@@ -26,15 +26,15 @@ filegroup(
     name = "distribution",
     srcs = [
         "BUILD",
-        "LICENSE",
+        "WORKSPACE",
         "internal_deps.bzl",
         "internal_setup.bzl",
         "//python:distribution",
         "//python/pip_install:distribution",
         "//third_party/github.com/bazelbuild/bazel-skylib/lib:distribution",
         "//tools:distribution",
     ],
-    visibility = ["//distro:__pkg__"],
+    visibility = ["//examples:__pkg__"],
 )
 
 # Reexport of all bzl files used to allow downstream rules to generate docs

DEVELOPING.md

@@ -14,23 +14,11 @@ changes still come under the minor-version digit. So releases with API changes a
 those with only bug fixes and other minor changes bump the patch digit.   
 
 #### Steps 
-
-1. Update `version.bzl` with the new semantic version `X.Y.Z`.
-2. Run `bazel build //distro:rules_python-X.Y.Z` to build the distributed tarball.
-3. Calculate the Sha256 hash of the tarball. This hash will be used in the `http_archive` rules that download the new release.
-    1. Example command for OSX: `shasum --algorithm 256 bazel-bin/distro/rules_python-0.1.0.tar.gz`
-4. Update nested examples in `examples/*/WORKSPACE` to get the new semantic version with the new `sha256` hash.
-5. Create commit called "Release X.Y.Z"
-    1. ["release 0.1.0"](https://github.com/bazelbuild/rules_python/commit/c8c79aae9aa1b61d199ad03d5fe06338febd0774) is an example commit.
-6. Tag that commit as `X.Y.Z`. Eg. `git tag X.Y.Z`
-7. Push the commit and the new tag to `main`.
-8. Run `bazel build //distro:relnotes` from within workspace and then from repo root run `cat bazel-bin/distro/relnotes.txt` to get the 'install instructions' that are added as release notes.
-    1. Check the `sha256` value matches the one you calculated earlier.
-9. ["Draft a new release"](https://github.com/bazelbuild/rules_python/releases/new) in Github (manual for now), selecting the recently pushed `X.Y.Z` tag.
-Upload the release artifact from `rules_python-[version].tar.gz`. Also copy the `relnotes.txt` from step 8, adding anything extra if desired.
+1. Determine what will be the next release, following semver.
+1. Create a tag and push, e.g. `git tag 0.5.0 upstream/main && git push upstream --tags`
+1. Watch the release automation run on https://github.com/bazelbuild/rules_python/actions
 
 #### After release creation in Github
 
-1. Update `README.md` to point at new release.
-2. Ping @philwo to get the new release added to mirror.bazel.build. See [this comment on issue #400](https://github.com/bazelbuild/rules_python/issues/400#issuecomment-779159530) for more context.
-3. Announce the release in the #python channel in the Bazel slack (bazelbuild.slack.com). 
+1. Ping @philwo to get the new release added to mirror.bazel.build. See [this comment on issue #400](https://github.com/bazelbuild/rules_python/issues/400#issuecomment-779159530) for more context.
+1. Announce the release in the #python channel in the Bazel slack (bazelbuild.slack.com). 

README.md

@@ -36,18 +36,10 @@ contribute](CONTRIBUTING.md) page for information on our development workflow.
 ## Getting started
 
 To import rules_python in your project, you first need to add it to your
-`WORKSPACE` file:
+`WORKSPACE` file, using the snippet provided in the
+[release you choose](https://github.com/bazelbuild/rules_python/releases)
 
-```python
-load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
-http_archive(
-    name = "rules_python",
-    url = "https://github.com/bazelbuild/rules_python/releases/download/0.5.0/rules_python-0.5.0.tar.gz",
-    sha256 = "cd6730ed53a002c56ce4e2f396ba3b3be262fd7cb68339f0377a45e8227fe332",
-)
-```
-
-To depend on a particular unreleased version (not recommended), you can do:
+To depend on a particular unreleased version, you can do:
 
 ```python
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")

examples/pip_install/WORKSPACE

@@ -11,10 +11,9 @@ http_archive(
     ],
 )
 
-http_archive(
+local_repository(
     name = "rules_python",
-    sha256 = "cd6730ed53a002c56ce4e2f396ba3b3be262fd7cb68339f0377a45e8227fe332",
-    url = "https://github.com/bazelbuild/rules_python/releases/download/0.5.0/rules_python-0.5.0.tar.gz",
+    path = "../..",
 )
 
 load("@rules_python//python:pip.bzl", "pip_install")

examples/pip_parse/WORKSPACE

@@ -1,11 +1,8 @@
 workspace(name = "example_repo")
 
-load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
-
-http_archive(
+local_repository(
     name = "rules_python",
-    sha256 = "cd6730ed53a002c56ce4e2f396ba3b3be262fd7cb68339f0377a45e8227fe332",
-    url = "https://github.com/bazelbuild/rules_python/releases/download/0.5.0/rules_python-0.5.0.tar.gz",
+    path = "../..",
 )
 
 load("@rules_python//python:pip.bzl", "pip_parse")

examples/py_import/WORKSPACE

@@ -1,11 +1,8 @@
 workspace(name = "py_import")
 
-load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
-
-http_archive(
+local_repository(
     name = "rules_python",
-    sha256 = "cd6730ed53a002c56ce4e2f396ba3b3be262fd7cb68339f0377a45e8227fe332",
-    url = "https://github.com/bazelbuild/rules_python/releases/download/0.5.0/rules_python-0.5.0.tar.gz",
+    path = "../..",
 )
 
 load("@rules_python//python:pip.bzl", "pip_install")

examples/relative_requirements/WORKSPACE

@@ -1,11 +1,8 @@
 workspace(name = "example_repo")
 
-load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
-
-http_archive(
+local_repository(
     name = "rules_python",
-    sha256 = "cd6730ed53a002c56ce4e2f396ba3b3be262fd7cb68339f0377a45e8227fe332",
-    url = "https://github.com/bazelbuild/rules_python/releases/download/0.5.0/rules_python-0.5.0.tar.gz",
+    path = "../..",
 )
 
 load("@rules_python//python:pip.bzl", "pip_install")

tools/bazel_integration_test/bazel_integration_test.bzl

@@ -1,6 +1,6 @@
 "Define a rule for running bazel test under Bazel"
 
-load("//:version.bzl", "SUPPORTED_BAZEL_VERSIONS", "version")
+load("//:version.bzl", "SUPPORTED_BAZEL_VERSIONS")
 load("//python:defs.bzl", "py_test")
 
 BAZEL_BINARY = "@build_bazel_bazel_%s//:bazel_binary" % SUPPORTED_BAZEL_VERSIONS[0].replace(".", "_")
@@ -19,10 +19,6 @@ It is assumed by the test runner that the bazel binary is found at label_workspa
 Note that if a command contains a bare `--` argument, the --test_arg passed to Bazel will appear before it.
 """,
     ),
-    "distro": attr.label(
-        allow_single_file = True,
-        doc = "the .tar.gz distribution file of rules_python to test",
-    ),
     "workspace_files": attr.label(
         doc = """A filegroup of all files in the workspace-under-test necessary to run the test.""",
     ),
@@ -55,14 +51,12 @@ You probably need to run
 {{
     "workspaceRoot": "{TMPL_workspace_root}",
     "bazelBinaryWorkspace": "{TMPL_bazel_binary_workspace}",
-    "bazelCommands": [ {TMPL_bazel_commands} ],
-    "distro": "rules_python/{TMPL_distro_path}"
+    "bazelCommands": [ {TMPL_bazel_commands} ]
 }}
 """.format(
             TMPL_workspace_root = ctx.files.workspace_files[0].dirname,
             TMPL_bazel_binary_workspace = ctx.attr.bazel_binary.label.workspace_name,
             TMPL_bazel_commands = ", ".join(["\"%s\"" % s for s in ctx.attr.bazel_commands]),
-            TMPL_distro_path = ctx.file.distro.short_path,
         ),
     )
 
@@ -99,7 +93,6 @@ def bazel_integration_test(name, **kwargs):
     _config(
         name = "_%s_config" % name,
         workspace_files = workspace_files,
-        distro = "//distro:rules_python-%s" % version,
     )
 
     py_test(
@@ -110,7 +103,7 @@ def bazel_integration_test(name, **kwargs):
         deps = [Label("//python/runfiles")],
         data = [
             BAZEL_BINARY,
-            "//distro:rules_python-%s.tar.gz" % version,
+            "//:distribution",
             "_%s_config" % name,
             workspace_files,
         ],

tools/bazel_integration_test/test_runner.py

@@ -12,31 +12,6 @@
 
 r = runfiles.Create()
 
-
-def modify_WORKSPACE(wksp, distro_path):
-    """Update the WORKSPACE file in the example to point to our locally-built tar.gz
-    This allows users to clone rules_python, cd into the example/dir, and run the example directly,
-    while our integration tests use the locally-built copy.
-
-    Args:
-        wksp: filesystem absolute path of the bazel WORKSPACE file under test
-        distro_path: runfiles path of the distro .tar.gz
-    """
-    with open(wksp, "r") as wksp_file:
-        content = wksp_file.read()
-    # Replace the url for rules_python with our locally built one
-    content = re.sub(
-        r'url = "https://github.com/bazelbuild/rules_python/[^"]+"',
-        'url = "file://%s"' % r.Rlocation(distro_path),
-        content,
-    )
-    # comment out sha256 and strip_prefix if present
-    content = re.sub(r'sha256 = "', "#\1", content)
-    content = re.sub(r'strip_prefix = "', "#\1", content)
-    with open(wksp, "w") as wksp_file:
-        wksp_file.write(content)
-
-
 def main(conf_file):
     with open(conf_file) as j:
         config = json.load(j)
@@ -58,17 +33,11 @@ def main(conf_file):
         print("copying workspace under test %s to %s" % (workspacePath, workdir))
         shutil.copytree(workspacePath, workdir)
 
-        modify_WORKSPACE(os.path.join(workdir, "WORKSPACE"), config["distro"])
-
-        for command in config["bazelCommands"]:
-            bazel_args = command.split(" ")
-            try:
-                doubleHyphenPos = bazel_args.index("--")
-                print("patch that in ", doubleHyphenPos)
-            except ValueError:
-                pass
+        for command in config['bazelCommands']:
+            bazel_args = command.split(' ')
+            bazel_args.append("--override_repository=rules_python=%s/rules_python" % os.environ['TEST_SRCDIR'])
 
-            # Bazel's wrapper script needs this or you get
+            # Bazel's wrapper script needs this or you get 
             # 2020/07/13 21:58:11 could not get the user's cache directory: $HOME is not defined
             os.environ["HOME"] = str(Path.home())
 

version.bzl

@@ -11,9 +11,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-"""The version of rules_python."""
-
-version = "0.5.0"
+"""Versions of rules_python dependencies."""
 
 # Currently used Bazel version. This version is what the rules here are tested
 # against.