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fetch: Use data from descriptor when available.

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OCI added support for a `data` field in a descriptor.
This field is expected to contain the content being pointed to by the
descriptor.

Signed-off-by: Brian Goff <cpuguy83@gmail.com>
This commit is contained in:
Brian Goff 2023-02-10 00:27:11 +00:00
parent 97480afdac
commit 13652e081e
2 changed files with 9 additions and 0 deletions
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4
content/helpers.go
View File

@ -59,6 +59,10 @@ func NewReader(ra ReaderAt) io.Reader {
//
// Avoid using this for large blobs, such as layers.
func ReadBlob(ctx context.Context, provider Provider, desc ocispec.Descriptor) ([]byte, error) {
if int64(len(desc.Data)) == desc.Size && digest.FromBytes(desc.Data) == desc.Digest {
return desc.Data, nil
}
ra, err := provider.ReaderAt(ctx, desc)
if err != nil {
return nil, err

5
remotes/handlers.go
View File

@ -17,6 +17,7 @@
package remotes
import (
"bytes"
"context"
"errors"
"fmt"
@ -139,6 +140,10 @@ func Fetch(ctx context.Context, ingester content.Ingester, fetcher Fetcher, desc
return err
}
if desc.Size == int64(len(desc.Data)) {
return content.Copy(ctx, cw, bytes.NewReader(desc.Data), desc.Size, desc.Digest)
}
rc, err := fetcher.Fetch(ctx, desc)
if err != nil {
return err