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build: configure secondary mirror fallback #3814

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45ec92c
build: configure secondary mirror fallback
rickeylev Jun 8, 2026
2a21ddc
build: anchor regex and escape dots in downloader config
rickeylev Jun 8, 2026
41a7250
build: remove redundant removal comment in downloader config
rickeylev Jun 8, 2026
49c9045
build: add rules_shell secondary mirror fallback
rickeylev Jun 8, 2026
0967633
build: add bazel-skylib secondary mirror fallback
rickeylev Jun 8, 2026
4c24fb1
build: add rules_go secondary mirror fallback
rickeylev Jun 8, 2026
883454c
build: add rules_kotlin secondary mirror fallback
rickeylev Jun 8, 2026
b15adfe
docs(agents): document CI failure repository inspection guidance
rickeylev Jun 8, 2026
6a47bf4
build: add bazel_features secondary mirror fallback
rickeylev Jun 8, 2026
6e00251
build: configure secondary mirror fallback in sphinxdocs and gazelle …
rickeylev Jun 8, 2026
4049884
Merge branch 'main' into configure-bazel-dependency-mirrors
rickeylev Jun 8, 2026
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2 changes: 2 additions & 0 deletions .bazelrc
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Original file line number Diff line number Diff line change
Expand Up @@ -44,6 +44,8 @@ common --enable_bzlmod

# Local disk cache greatly speeds up builds if the regular cache is lost
common --disk_cache=~/.cache/bazel/bazel-disk-cache
# Drop `experimental_` prefix once Bazel 7 is no longer supported
common --experimental_downloader_config=downloader_config.cfg


# Additional config to use for readthedocs builds.
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6 changes: 6 additions & 0 deletions AGENTS.md
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Expand Up @@ -207,3 +207,9 @@ e.g.
```
load("//python/private:foo.bzl", "foo") # buildifier: disable=bzl-visibility
```

### CI Failure Inspection

When inspecting CI failures, if the failure is due to a network error
downloading a repository, check if that rule set is mirrored on
mirror.bazel.build. If so, add it to the downloader config.
16 changes: 16 additions & 0 deletions downloader_config.cfg
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@@ -0,0 +1,16 @@
# Try GitHub first (primary)
rewrite ^github\.com/bazel-contrib/bazel_features/(.*) github.com/bazel-contrib/bazel_features/$1
rewrite ^github\.com/bazel-contrib/rules_go/(.*) github.com/bazel-contrib/rules_go/$1
rewrite ^github\.com/bazelbuild/bazel-skylib/(.*) github.com/bazelbuild/bazel-skylib/$1
rewrite ^github\.com/bazelbuild/platforms/(.*) github.com/bazelbuild/platforms/$1
rewrite ^github\.com/bazelbuild/rules_kotlin/(.*) github.com/bazelbuild/rules_kotlin/$1
rewrite ^github\.com/bazelbuild/rules_shell/(.*) github.com/bazelbuild/rules_shell/$1

# Fall back to mirror (secondary)
# Tracking upstream BCR mirror addition: https://github.com/bazelbuild/platforms/issues/139
rewrite ^github\.com/bazel-contrib/bazel_features/(.*) mirror.bazel.build/github.com/bazel-contrib/bazel_features/$1
rewrite ^github\.com/bazel-contrib/rules_go/(.*) mirror.bazel.build/github.com/bazel-contrib/rules_go/$1
rewrite ^github\.com/bazelbuild/bazel-skylib/(.*) mirror.bazel.build/github.com/bazelbuild/bazel-skylib/$1
rewrite ^github\.com/bazelbuild/platforms/(.*) mirror.bazel.build/github.com/bazelbuild/platforms/$1
rewrite ^github\.com/bazelbuild/rules_kotlin/(.*) mirror.bazel.build/github.com/bazelbuild/rules_kotlin/$1
rewrite ^github\.com/bazelbuild/rules_shell/(.*) mirror.bazel.build/github.com/bazelbuild/rules_shell/$1
1 change: 1 addition & 0 deletions gazelle/.bazelrc
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@@ -1,5 +1,6 @@
common --deleted_packages=examples/bzlmod_build_file_generation
common --deleted_packages=examples/bzlmod_build_file_generation/runfiles
common --experimental_downloader_config=downloader_config.cfg

test --test_output=errors

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16 changes: 16 additions & 0 deletions gazelle/downloader_config.cfg
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@@ -0,0 +1,16 @@
# Try GitHub first (primary)
rewrite ^github\.com/bazel-contrib/bazel_features/(.*) github.com/bazel-contrib/bazel_features/$1
rewrite ^github\.com/bazel-contrib/rules_go/(.*) github.com/bazel-contrib/rules_go/$1
rewrite ^github\.com/bazelbuild/bazel-skylib/(.*) github.com/bazelbuild/bazel-skylib/$1
rewrite ^github\.com/bazelbuild/platforms/(.*) github.com/bazelbuild/platforms/$1
rewrite ^github\.com/bazelbuild/rules_kotlin/(.*) github.com/bazelbuild/rules_kotlin/$1
rewrite ^github\.com/bazelbuild/rules_shell/(.*) github.com/bazelbuild/rules_shell/$1

# Fall back to mirror (secondary)
# Tracking upstream BCR mirror addition: https://github.com/bazelbuild/platforms/issues/139
rewrite ^github\.com/bazel-contrib/bazel_features/(.*) mirror.bazel.build/github.com/bazel-contrib/bazel_features/$1
rewrite ^github\.com/bazel-contrib/rules_go/(.*) mirror.bazel.build/github.com/bazel-contrib/rules_go/$1
rewrite ^github\.com/bazelbuild/bazel-skylib/(.*) mirror.bazel.build/github.com/bazelbuild/bazel-skylib/$1
rewrite ^github\.com/bazelbuild/platforms/(.*) mirror.bazel.build/github.com/bazelbuild/platforms/$1
rewrite ^github\.com/bazelbuild/rules_kotlin/(.*) mirror.bazel.build/github.com/bazelbuild/rules_kotlin/$1
rewrite ^github\.com/bazelbuild/rules_shell/(.*) mirror.bazel.build/github.com/bazelbuild/rules_shell/$1
1 change: 1 addition & 0 deletions sphinxdocs/.bazelrc
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Expand Up @@ -15,6 +15,7 @@ build --enable_runfiles

# Local disk cache greatly speeds up builds if the regular cache is lost
common --disk_cache=~/.cache/bazel/bazel-disk-cache
common --experimental_downloader_config=downloader_config.cfg

common --incompatible_python_disallow_native_rules
common --incompatible_no_implicit_file_export
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16 changes: 16 additions & 0 deletions sphinxdocs/downloader_config.cfg
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Original file line number Diff line number Diff line change
@@ -0,0 +1,16 @@
# Try GitHub first (primary)
rewrite ^github\.com/bazel-contrib/bazel_features/(.*) github.com/bazel-contrib/bazel_features/$1
rewrite ^github\.com/bazel-contrib/rules_go/(.*) github.com/bazel-contrib/rules_go/$1
rewrite ^github\.com/bazelbuild/bazel-skylib/(.*) github.com/bazelbuild/bazel-skylib/$1
rewrite ^github\.com/bazelbuild/platforms/(.*) github.com/bazelbuild/platforms/$1
rewrite ^github\.com/bazelbuild/rules_kotlin/(.*) github.com/bazelbuild/rules_kotlin/$1
rewrite ^github\.com/bazelbuild/rules_shell/(.*) github.com/bazelbuild/rules_shell/$1

# Fall back to mirror (secondary)
# Tracking upstream BCR mirror addition: https://github.com/bazelbuild/platforms/issues/139
rewrite ^github\.com/bazel-contrib/bazel_features/(.*) mirror.bazel.build/github.com/bazel-contrib/bazel_features/$1
rewrite ^github\.com/bazel-contrib/rules_go/(.*) mirror.bazel.build/github.com/bazel-contrib/rules_go/$1
rewrite ^github\.com/bazelbuild/bazel-skylib/(.*) mirror.bazel.build/github.com/bazelbuild/bazel-skylib/$1
rewrite ^github\.com/bazelbuild/platforms/(.*) mirror.bazel.build/github.com/bazelbuild/platforms/$1
rewrite ^github\.com/bazelbuild/rules_kotlin/(.*) mirror.bazel.build/github.com/bazelbuild/rules_kotlin/$1
rewrite ^github\.com/bazelbuild/rules_shell/(.*) mirror.bazel.build/github.com/bazelbuild/rules_shell/$1