1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
package blobinfocache
import (
"github.com/containers/image/v5/pkg/compression"
compressiontypes "github.com/containers/image/v5/pkg/compression/types"
"github.com/containers/image/v5/types"
digest "github.com/opencontainers/go-digest"
)
// FromBlobInfoCache returns a BlobInfoCache2 based on a BlobInfoCache, returning the original
// object if it implements BlobInfoCache2, or a wrapper which discards compression information
// if it only implements BlobInfoCache.
func FromBlobInfoCache(bic types.BlobInfoCache) BlobInfoCache2 {
if bic2, ok := bic.(BlobInfoCache2); ok {
return bic2
}
return &v1OnlyBlobInfoCache{
BlobInfoCache: bic,
}
}
type v1OnlyBlobInfoCache struct {
types.BlobInfoCache
}
func (bic *v1OnlyBlobInfoCache) Open() {
}
func (bic *v1OnlyBlobInfoCache) Close() {
}
func (bic *v1OnlyBlobInfoCache) RecordDigestCompressorName(anyDigest digest.Digest, compressorName string) {
}
func (bic *v1OnlyBlobInfoCache) CandidateLocations2(transport types.ImageTransport, scope types.BICTransportScope, digest digest.Digest, canSubstitute bool) []BICReplacementCandidate2 {
return nil
}
// CandidateLocationsFromV2 converts a slice of BICReplacementCandidate2 to a slice of
// types.BICReplacementCandidate, dropping compression information.
func CandidateLocationsFromV2(v2candidates []BICReplacementCandidate2) []types.BICReplacementCandidate {
candidates := make([]types.BICReplacementCandidate, 0, len(v2candidates))
for _, c := range v2candidates {
candidates = append(candidates, types.BICReplacementCandidate{
Digest: c.Digest,
Location: c.Location,
})
}
return candidates
}
// OperationAndAlgorithmForCompressor returns CompressionOperation and CompressionAlgorithm
// values suitable for inclusion in a types.BlobInfo structure, based on the name of the
// compression algorithm, or Uncompressed, or UnknownCompression. This is typically used by
// TryReusingBlob() implementations to set values in the BlobInfo structure that they return
// upon success.
func OperationAndAlgorithmForCompressor(compressorName string) (types.LayerCompression, *compressiontypes.Algorithm, error) {
switch compressorName {
case Uncompressed:
return types.Decompress, nil, nil
case UnknownCompression:
return types.PreserveOriginal, nil, nil
default:
algo, err := compression.AlgorithmByName(compressorName)
if err == nil {
return types.Compress, &algo, nil
}
return types.PreserveOriginal, nil, err
}
}
|
