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Subpar is failing on Bazel CI since the upgrade to Ubuntu 20.04

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Ubuntu 20.04 uses Python 3, which might be what's causing this. Lots of test failures, see https://buildkite.com/bazel/subpar/builds/7413#7f8773f9-2385-4244-8a00-da4c4dd9a2ab

Write a repo mapping manifest in the runfiles directory

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To ensure we can use repo mappings in the runfiles library, this change writes an extra file "my_binary_target.runfiles/_repo_mapping", which contains a bunch of (base_repo_canonical_name, apparent_repo_name, canonical_repo_name) triples. See https://github.com/bazelbuild/proposals/blob/main/designs/2022-07-21-locating-runfiles-with-bzlmod.md for...

Implement `bazel_compatibility` on the `module` directive

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See [section in the original design doc](https://docs.google.com/document/d/1moQfNcEIttsk6vYanNKIy3ZuK53hQUFq1b1r0rmsYVg/edit#heading=h.vxty4pj7bwk8). Also a bit more background in https://github.com/bazelbuild/bazel-skylib/issues/384

Release 6.0.0 - November 2022

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# Status of Bazel 6.0.0 - Target baseline: 2022-10-10 - Expected release date: 2022-11-14 - [List of release blockers](https://github.com/bazelbuild/bazel/milestone/38) To report a release-blocking bug, please add a comment with the...

Target pattern attributes on `scala_toolchain` are erroneously checked

2

`scala_toolchain` has two attributes that specify target patterns: https://github.com/bazelbuild/rules_scala/blob/17791a18aa966cdf2babb004822e6c70a7decc76/scala/scala_toolchain.bzl#L120-L127 These are implemented as string lists, and directly used to compare with a stringified label's prefix: https://github.com/bazelbuild/rules_scala/blob/b85d1225d0ddc9c376963eb0be86d9d546f25a4a/scala/private/phases/phase_dependency.bzl#L82-L91 This is very brittle...

Shell tests in rules_scala don't use the Bazel sh_test rule

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Shell tests in rules_scala are run by executing a huge shell script (`//:test_rules_scala.sh`) which runs each individual shell test function sequentially. This is very painful for developers: * No caching:...

Fix more test assertions for '@' in main-repo labels

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Also disabled some tests involving target patterns (see https://github.com/bazelbuild/rules_scala/issues/1420) ### Description ### Motivation

Multiple downstream failures due to `--incompatible_use_platforms_repo_for_constraints`

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Failures: https://buildkite.com/bazel/bazel-at-head-plus-downstream/builds/2586#0182a995-9a6f-49fc-a38d-06487e43e242 Flag flip commit: https://github.com/bazelbuild/bazel/commit/3469784a4935c91b4ac22bcfed6be52e6dfec878 Autosheriff link: https://buildkite.com/bazel/bazel-auto-sheriff-face-with-cowboy-hat/builds/1005 Projects to fix: - [x] Bazel - [x] Bazel integration testing: removed https://github.com/bazelbuild/continuous-integration/pull/1405 - [x] Bazelisk: sent https://github.com/bazelbuild/bazelisk/pull/348 - [x] Buildfarm:...

Add `rctx.watch_tree()` to watch a directory tree

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- Added `rctx.watch_tree()` to watch a directory tree, which includes all transitive descendants' names, and if they're files, their contents. - In the future we could add glob patterns to...

Do not record or check repo mapping entries for repos defined in WORKSPACE

3

Mappings for repos defined in WORKSPACE are extremely annoying to verify given the chunked loading (we'd have to record which chunk the repo mapping was used in, and then load...