chore: bzlmod (#162)

* chore: bzlmod

- Upgrade to Bazel 6.2.0 since Bazel 5 has bzlmod bugs. TODO: update the GHA ci.yaml to test on Bazel 5 as well.
- Introduce simple MODULE.bazel file
- Add .bcr folder so the Publish to BCR app automates publishing on releases

* chore: update goldens for Bazel 6

* chore: fixup BAZEL_TARGET rather than change assertion

.bazelignore

@@ -0,0 +1 @@
+e2e/

.bazelversion

@@ -1,4 +1,4 @@
-5.4.0
+6.2.0
 # The first line of this file is used by Bazelisk and Bazel to be sure
 # the right version of Bazel is used to build and test this repo.
 # This also defines which version is used on CI.

.bcr/config.yml

@@ -0,0 +1,3 @@
+fixedReleaser:
+  login: mattem
+  email: [email protected]

.bcr/metadata.template.json

@@ -0,0 +1,15 @@
+{
+    "homepage": "https://docs.aspect.build/rules/aspect_rules_py",
+    "maintainers": [
+      {
+        "email": "[email protected]",
+        "github": "aspect-build",
+        "name": "Aspect team"
+      }
+    ],
+    "repository": [
+      "github:aspect-build/rules_py"
+    ],
+    "versions": [],
+    "yanked_versions": {}
+}

.bcr/presubmit.yml

@@ -0,0 +1,10 @@
+bcr_test_module:
+  module_path: "e2e/smoke"
+  matrix:
+    platform: ["debian10", "macos", "ubuntu2004", "windows"]
+  tasks:
+    run_tests:
+      name: "Run test module"
+      platform: ${{ platform }}
+      test_targets:
+        - "//..."

.bcr/source.template.json

@@ -0,0 +1,5 @@
+{
+    "integrity": "**leave this alone**",
+    "strip_prefix": "{REPO}-{VERSION}",
+    "url": "https://github.com/{OWNER}/{REPO}/releases/download/{TAG}/{REPO}-{TAG}.tar.gz"
+}

.github/workflows/release_prep.sh

@@ -12,7 +12,28 @@ git archive --format=tar --prefix=${PREFIX}/ ${TAG} | gzip > $ARCHIVE
 SHA=$(shasum -a 256 $ARCHIVE | awk '{print $1}')
 
 cat << EOF
-WORKSPACE snippet:
+## Using [Bzlmod] with Bazel 6:
+
+Add to your \`MODULE.bazel\` file:
+
+\`\`\`starlark
+bazel_dep(name = "aspect_rules_py", version = "${TAG:1}")
+\`\`\`
+
+And also register a Python toolchain, see rules_python. For example:
+
+\`\`\`starlark
+EOF
+
+awk 'f;/--SNIP--/{f=1}' e2e/smoke/MODULE.bazel
+
+cat << EOF
+\`\`\`
+
+[Bzlmod]: https://bazel.build/build/bzlmod
+
+## Using WORKSPACE
+
 \`\`\`starlark
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 http_archive(
@@ -21,14 +42,7 @@ http_archive(
     strip_prefix = "${PREFIX}",
     url = "https://github.com/aspect-build/rules_py/releases/download/${TAG}/${ARCHIVE}",
 )
-
-# Fetches the rules_py dependencies.
-# If you want to have a different version of some dependency,
-# you should fetch it *before* calling this.
-# Alternatively, you can skip calling this function, so long as you've
-# already fetched all the dependencies.
-load("@aspect_rules_py//py:repositories.bzl", "rules_py_dependencies")
-rules_py_dependencies()
-
-\`\`\`
 EOF
+
+awk 'f;/--SNIP--/{f=1}' e2e/smoke/WORKSPACE.bazel
+echo "\`\`\`"

MODULE.bazel

@@ -0,0 +1,13 @@
+"aspect-build/rules_py"
+
+module(
+    name = "aspect_rules_py",
+    compatibility_level = 1,
+    version = "0.0.0",
+)
+
+# Lower-bound versions of direct dependencies.
+# When bumping, add a comment explaining what's required from the newer release.
+bazel_dep(name = "aspect_bazel_lib", version = "1.30.2")
+bazel_dep(name = "bazel_skylib", version = "1.4.0")
+bazel_dep(name = "rules_python", version = "0.19.0")

README.md

@@ -44,6 +44,5 @@ _Need help?_ This ruleset has support provided by https://aspect.dev.
 
 ## Installation
 
-From the release you wish to use:
+Follow instructions from the release you wish to use:
 <https://github.com/aspect-build/rules_py/releases>
-copy the WORKSPACE snippet into your `WORKSPACE` file.

e2e/smoke/.bazelversion

@@ -0,0 +1 @@
+../../.bazelversion

e2e/smoke/BUILD.bazel

@@ -0,0 +1,6 @@
+load("@aspect_rules_py//py:defs.bzl", "py_test")
+
+py_test(
+    name = "bin",
+    srcs = ["__main__.py"],
+)

e2e/smoke/MODULE.bazel

@@ -0,0 +1,22 @@
+"Bazel dependencies"
+bazel_dep(name = "aspect_rules_py", dev_dependency = True, version = "0.0.0")
+
+local_path_override(
+    module_name = "aspect_rules_py",
+    path = "../..",
+)
+
+#---SNIP--- Below here is re-used in the snippet published on releases
+bazel_dep(name = "rules_python", dev_dependency = True, version = "0.22.0")
+
+python = use_extension("@rules_python//python/extensions:python.bzl", "python")
+python.toolchain(
+    name = "python3_9",
+    configure_coverage_tool = True,
+    python_version = "3.9",
+)
+use_repo(python, "python3_9_toolchains")
+
+register_toolchains(
+    "@python3_9_toolchains//:all",
+)

e2e/smoke/WORKSPACE.bazel

@@ -0,0 +1,14 @@
+# Override http_archive for local testing
+local_repository(
+    name = "aspect_rules_py",
+    path = "../..",
+)
+
+#---SNIP--- Below here is re-used in the snippet published on releases
+# Fetches the rules_py dependencies.
+# If you want to have a different version of some dependency,
+# you should fetch it *before* calling this.
+# Alternatively, you can skip calling this function, so long as you've
+# already fetched all the dependencies.
+load("@aspect_rules_py//py:repositories.bzl", "rules_py_dependencies")
+rules_py_dependencies()

e2e/smoke/WORKSPACE.bzlmod

@@ -0,0 +1 @@
+# This file replaces `WORKSPACE.bazel` when --enable_bzlmod is set.

e2e/smoke/__main__.py

@@ -0,0 +1 @@
+print("hello world")

py/defs.bzl

@@ -31,6 +31,8 @@ def py_binary(name, srcs = [], main = None, imports = ["."], **kwargs):
         main: the entry point. If absent, then the first entry in srcs is used.
         **kwargs: see [py_binary attributes](./py_binary)
     """
+    if not main and not len(srcs):
+        fail("When 'main' is not specified, 'srcs' must be non-empty")
     _py_binary(
         name = name,
         srcs = srcs,

py/private/py_binary.bzl

@@ -19,7 +19,7 @@ def _py_binary_rule_imp(ctx):
     )
 
     env = dict({
-        "BAZEL_TARGET": str(ctx.label),
+        "BAZEL_TARGET": str(ctx.label).lstrip("@"),
         "BAZEL_WORKSPACE": ctx.workspace_name,
         "BAZEL_TARGET_NAME": ctx.attr.name,
     }, **ctx.attr.env)

py/tests/external-deps/BUILD.bazel

@@ -27,6 +27,7 @@ genrule(
         "$(execpath pathing)",
         """sed "s#$$(pwd)#(pwd)#" """,
         "sed 's#^.*execroot/aspect_rules_py/external/python_toolchain_%s#(py_toolchain)#'" % host_platform,
+        "sed 's#bazel-out/[_a-z0-9-]*-exec-[A-Z0-9]*/bin/#bazel-out/[exec]/bin/#'",
         "sed 's#(main, .*)#(main, REDACTED)#'",
     ]) + "> $@",
     tools = ["pathing"],

py/tests/external-deps/expected_pathing

@@ -1,23 +1,23 @@
-Python: (pwd)/bazel-out/host/bin/py/tests/external-deps/pathing.runfiles/pathing.venv/bin/python
+Python: (pwd)/bazel-out/[exec]/bin/py/tests/external-deps/pathing.runfiles/pathing.venv/bin/python
 version: 3.9.15 (main, REDACTED) 
 [Clang 14.0.3 ]
 version info: sys.version_info(major=3, minor=9, micro=15, releaselevel='final', serial=0)
 cwd: (pwd)
-site-packages folder: ['(pwd)/bazel-out/host/bin/py/tests/external-deps/pathing.runfiles/pathing.venv/lib/python3.9/site-packages']
+site-packages folder: ['(pwd)/bazel-out/[exec]/bin/py/tests/external-deps/pathing.runfiles/pathing.venv/lib/python3.9/site-packages']
 
 sys path:
 (py_toolchain)/lib/python39.zip
 (py_toolchain)/lib/python3.9
 (py_toolchain)/lib/python3.9/lib-dynload
-(pwd)/bazel-out/host/bin/py/tests/external-deps/pathing.runfiles/pathing.venv/lib/python3.9/site-packages
-(pwd)/bazel-out/host/bin/py/tests/external-deps/pathing.runfiles
-(pwd)/bazel-out/host/bin/py/tests/external-deps/pathing.runfiles/aspect_rules_py/py/tests/external-deps
-(pwd)/bazel-out/host/bin/py/tests/external-deps/pathing.runfiles/aspect_rules_py
+(pwd)/bazel-out/[exec]/bin/py/tests/external-deps/pathing.runfiles/pathing.venv/lib/python3.9/site-packages
+(pwd)/bazel-out/[exec]/bin/py/tests/external-deps/pathing.runfiles
+(pwd)/bazel-out/[exec]/bin/py/tests/external-deps/pathing.runfiles/aspect_rules_py/py/tests/external-deps
+(pwd)/bazel-out/[exec]/bin/py/tests/external-deps/pathing.runfiles/aspect_rules_py
 
-Entrypoint Path: (pwd)/bazel-out/host/bin/py/tests/external-deps/pathing.runfiles/aspect_rules_py/py/tests/external-deps/pathing.py
+Entrypoint Path: (pwd)/bazel-out/[exec]/bin/py/tests/external-deps/pathing.runfiles/aspect_rules_py/py/tests/external-deps/pathing.py
 
-Django location: (pwd)/bazel-out/host/bin/py/tests/external-deps/pathing.runfiles/pathing.venv/lib/python3.9/site-packages/django/__init__.py
+Django location: (pwd)/bazel-out/[exec]/bin/py/tests/external-deps/pathing.runfiles/pathing.venv/lib/python3.9/site-packages/django/__init__.py
 Django version: 4.0.10
 
 From lib with wheel dependency: Hello Matt
-lib filepath: (pwd)/bazel-out/host/bin/py/tests/external-deps/pathing.runfiles/aspect_rules_py/py/tests/external-deps/lib.py
+lib filepath: (pwd)/bazel-out/[exec]/bin/py/tests/external-deps/pathing.runfiles/aspect_rules_py/py/tests/external-deps/lib.py