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[6.2.0] Skip empty directories in prefetcher. #17710

Merged
merged 1 commit into from
Mar 9, 2023
Merged

[6.2.0] Skip empty directories in prefetcher. #17710

merged 1 commit into from
Mar 9, 2023

Commits on Mar 9, 2023

  1. [6.2.0] Skip empty directories in prefetcher. 

    While non-empty tree artifacts in the inputs to an action are expanded into the files they contain and omitted from the input mapping, empty tree artifacts are still present, as they signal the need to create the directory.

I'm explicitly skipping the empty tree artifacts in prefetchFiles() as otherwise they get skipped as a result of FileArtifactValue#isRemote() returning false for the FileArtifactValue associated with an empty tree artifact (even if it was produced remotely!), which is extremely subtle.

Closes bazelbuild#17183.

[NOTE: this is a combined cherry pick of 763f966 and 4c57def, as the former left Bazel in a broken state.]

PiperOrigin-RevId: 501207095
Change-Id: Ib52727d6fdc6b7a291a61fba33914e57531fb1f4
    @tjgq
    tjgq committed Mar 9, 2023
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