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Handle non-gzip compression

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Correctly compute the DiffID of non-gzip-compressed layers,
and if possible, set the layer MIME type correctly.

Signed-off-by: Miloslav Trmač <mitr@redhat.com>
This commit is contained in:
Miloslav Trmač 2025-03-19 17:53:28 +01:00
parent 044f4de0e5
commit 3b3e6d34aa
1 changed files with 20 additions and 5 deletions
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25
tarball/tarball_src.go
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@ -14,8 +14,9 @@ import (
"github.com/containers/image/v5/internal/imagesource/impl"
"github.com/containers/image/v5/internal/imagesource/stubs"
"github.com/containers/image/v5/pkg/compression"
compressionTypes "github.com/containers/image/v5/pkg/compression/types"
"github.com/containers/image/v5/types"
"github.com/klauspost/pgzip"
digest "github.com/opencontainers/go-digest"
imgspecs "github.com/opencontainers/image-spec/specs-go"
imgspecv1 "github.com/opencontainers/image-spec/specs-go/v1"
@ -88,15 +89,29 @@ func (r *tarballReference) NewImageSource(ctx context.Context, sys *types.System
var layerType string
var diffIDdigester digest.Digester
// Set up to digest the file after we maybe decompress it.
// If necessary, digest the file after we decompress it.
if err := func() error { // A scope for defer
uncompressed, err := pgzip.NewReader(reader)
if err == nil {
format, decompressor, reader, err := compression.DetectCompressionFormat(reader)
if err != nil {
return err
}
if decompressor != nil {
uncompressed, err := decompressor(reader)
if err != nil {
return err
}
defer uncompressed.Close()
// It is compressed, so the diffID is the digest of the uncompressed version
diffIDdigester = digest.Canonical.Digester()
reader = io.TeeReader(uncompressed, diffIDdigester.Hash())
layerType = imgspecv1.MediaTypeImageLayerGzip
switch format.Name() {
case compressionTypes.GzipAlgorithmName:
layerType = imgspecv1.MediaTypeImageLayerGzip
case compressionTypes.ZstdAlgorithmName:
layerType = imgspecv1.MediaTypeImageLayerZstd
default: // This is incorrect, but we have no good options, and it is what this transport was historically doing.
layerType = imgspecv1.MediaTypeImageLayerGzip
}
} else {
// It is not compressed, so the diffID and the blobID are going to be the same
diffIDdigester = blobIDdigester