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Use ctime in file digest cache key #18115

Merged
merged 1 commit into from
Apr 17, 2023
Merged

Use ctime in file digest cache key #18115

merged 1 commit into from
Apr 17, 2023

Commits on Apr 17, 2023

  1. Use ctime in file digest cache key 

    File digests are now additionally keyed by ctime for supported file system implementations. Since Bazel has a non-zero default for `--cache_computed_file_digests`, this may be required for correctness in cases where different files have identical mtime and inode number. For example, this can happen on Linux when files are extracted from a tar file with fixed mtime and are then replaced with `mv`, which preserves inodes.

Since Java (N)IO doesn't have support for reading file ctimes on Windows, a new method backed by a native implementation is added to `WindowsFileOperation`. Adding a call to this function to `stat` uncovered previously silent bugs where Unix-style `PathFragment`s were created on Windows:

1. Bzlmod's `createLocalRepoSpec` did not correctly extract the path from a registry's `file://` URI on Windows.
2. `--package_path` isn't usable with absolute paths on Windows as it splits on `:`. Since the flag is deprecated, this commit fixes the tests rather than the implementation.

Fixes bazelbuild#14723

Closes bazelbuild#18003.

PiperOrigin-RevId: 524297459
Change-Id: I96bfc0210e2f71bf8603c7b7cc5eb06a04048c85
    @fmeum
    fmeum committed Apr 17, 2023
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