Rely on mtime instead of ctime for change detection.#27685
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ulrfa wants to merge 1 commit intobazelbuild:masterfrom
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Rely on mtime instead of ctime for change detection.#27685ulrfa wants to merge 1 commit intobazelbuild:masterfrom
ulrfa wants to merge 1 commit intobazelbuild:masterfrom
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This commit is experimental and serves as input for discussion on issue bazelbuild#27226. There are still open questions, failing test cases, lack of new test cases, etc. Changed functionality: * Ensure mtimes are trustworthy for detecting change for all outputs produced by actions and repository rules, including cases when archives with fake mtimes are extracted. * Compare mtime but not ctime when detecting changes for caches digests. However, fallback to comparing ctime if mtime is zero.
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This commit is experimental and serves as input for discussion on issue #27226.
There are still open questions, failing test cases, lack of new test cases, etc.
Changed functionality:
Ensure mtimes are trustworthy for detecting change for all outputs produced by actions and repository rules, including cases when archives with fake mtimes are extracted.
Compare mtime but not ctime when detecting changes for caches digests. However, fallback to comparing ctime if mtime is zero.