contenthash: clear ModeIrregular before sending to archive/tar #5665
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Clears ModeIrregular from the checksum generation. This may be sent by the client when the version of Go used is post Go 1.23. The behavior of `os.Stat` was modified in Go 1.23 to set `ModeIrregular` on reparse points in Windows. This clears `ModeIrregular` when any mode is set which was the previous behavior of `os.Stat`. Signed-off-by: Jonathan A. Sternberg <jonathan.sternberg@docker.com>
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| // bit to regular files with non-handled reparse points. | ||
| // Current versions of Go now apply them to directories too. | ||
| // archive/tar.FileInfoHeader does not handle the irregular bit. | ||
| if stat.Mode&uint32(os.ModeType&^os.ModeIrregular) != 0 { |
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Isn't the negation wrong in the condition here?
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The intention is to use os.ModeType but to remove os.ModeIrregular because os.ModeIrregular&os.ModeType will always return non-zero. so this uses the os.ModeType constant but removes os.ModeIrregular from it.
It's a bit tricky because the original condition checks if m&os.ModeType == 0 and sets os.ModeIrregular if it is. But, because we've now set os.ModeIrregular, the condition will always be true so the reverse doesn't work.
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I think they should get created as regular directories. Files will be excluded from this behavior and will still return an error which is what they previously did. While I used |
Where is that error happening? |
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It's happening inside of https://cs.opensource.google/go/go/+/refs/tags/go1.23.4:src/archive/tar/common.go;l=677 |
Clears ModeIrregular from the checksum generation. This may be sent by the client when the version of Go used is post Go 1.23. The behavior of
os.Statwas modified in Go 1.23 to setModeIrregularon reparse points in Windows. This clearsModeIrregularwhen any mode is set which was the previous behavior ofos.Stat.Fixes docker/for-win#14083.