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[6.2.0]Skip empty directories instead of throwing in prefetcher. #17718

Merged
merged 1 commit into from
Mar 10, 2023
Merged

[6.2.0]Skip empty directories instead of throwing in prefetcher. #17718

merged 1 commit into from
Mar 10, 2023

Commits on Mar 9, 2023

  1. Skip empty directories instead of throwing 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. Thus, the check added in 763f966 is incorrect.

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.

PiperOrigin-RevId: 501207095
Change-Id: Ib52727d6fdc6b7a291a61fba33914e57531fb1f4
    @tjgq @ShreeM01
    tjgq authored and ShreeM01 committed Mar 9, 2023
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