build: configure secondary mirror fallback#3814
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Currently, transient GitHub network issues can cause builds to fail when pulling platforms. To fix, configure Bazel's downloader to try GitHub first and fall back to mirror.bazel.build.
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Code Review
This pull request configures an experimental downloader configuration in .bazelrc and adds rewrite rules in downloader_config.cfg to handle fallbacks for Bazel platforms. The review feedback correctly points out that the regular expressions used for rewriting URLs are unanchored and contain unescaped dots, which could lead to unexpected matching behavior, and provides a robust alternative.
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FTR, we resolved this by using BuildBarn remote asset and a bazelisk wrapper that installs it for users. LMK if you'd like to know more.
Question: These configs do not apply to non-root bazel modules, correct? Meaning this will have no impact on any consumers of rules_python?
Hm, interesting, yeah i'd like to learn more. I'll send you a chat.
Correct |
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Currently, transient GitHub network issues can cause builds to fail
when pulling e.g. platforms.
To fix, configure Bazel's downloader to try GitHub first and fall back
to mirror.bazel.build.