Fix bugs in SBOM layer comment generation #3594
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tonistiigi
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Feb 10, 2023
| @@ -172,6 +176,8 @@ func newFileLayerFinder(target cache.ImmutableRef, remote *solver.Remote) (fileL | |||
| // | |||
| // find is not concurrency-safe. | |||
| func (c *fileLayerFinder) find(ctx context.Context, s session.Group, filename string) (cache.ImmutableRef, *ocispecs.Descriptor, error) { | |||
| filename = filepath.Clean("/" + filename) | |||
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isn't this supposed to be filepath.Join("/", filename)
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Thinking about the use of filepath as well. I think these paths should be unix normalized, but that can be follow-up when wcow becomes more realistic.
Signed-off-by: Justin Chadwell <me@jedevc.com>
Signed-off-by: Justin Chadwell <me@jedevc.com>
Signed-off-by: Justin Chadwell <me@jedevc.com>
Signed-off-by: Justin Chadwell <me@jedevc.com>
Signed-off-by: Justin Chadwell <me@jedevc.com>
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tonistiigi
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Feb 10, 2023
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BuildKit should generate comments for each file indicating what layer the file can be found in. However, when buildkit-syft-scanner switched to using chroot as a temporary hack (see docker/buildkit-syft-scanner#13), all paths in the SBOM were prefixed with
/. This minor format change meant that the exporter's layer finder would not find this file, as they would be discovered without the/prefix.To fix this, we just need to canonicalize the file paths, both on entry to the function, and for each file discovered.
Additionally, I also noticed a bug in the whiteout detection - we should only be checking the final path component for whiteouts, not the entire path... and also a panic with a scratch layer, and an issue with checking the core SBOM metadata field. Not quite sure why the code is so bug-full, I'm kinda surprised I wrote it in the first place 😢
I've added a test to check the file comment behavior doesn't break again.