deprecate ReadSeekCloser in favor of io.ReadSeekCloser

Go's io package in stdlib now defines this interface, so we can switch
to using that instead.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

blobs.go

@@ -142,20 +142,18 @@ type BlobDescriptorServiceFactory interface {
 
 // ReadSeekCloser is the primary reader type for blob data, combining
 // io.ReadSeeker with io.Closer.
-type ReadSeekCloser interface {
+//
-	io.ReadSeeker
+// Deprecated: use [io.ReadSeekCloser].
-	io.Closer
+type ReadSeekCloser = io.ReadSeekCloser
-}
 
 // BlobProvider describes operations for getting blob data.
 type BlobProvider interface {
 	// Get returns the entire blob identified by digest along with the descriptor.
 	Get(ctx context.Context, dgst digest.Digest) ([]byte, error)
 
-	// Open provides a ReadSeekCloser to the blob identified by the provided
+	// Open provides an [io.ReadSeekCloser] to the blob identified by the provided
-	// descriptor. If the blob is not known to the service, an error will be
+	// descriptor. If the blob is not known to the service, an error is returned.
-	// returned.
+	Open(ctx context.Context, dgst digest.Digest) (io.ReadSeekCloser, error)
-	Open(ctx context.Context, dgst digest.Digest) (ReadSeekCloser, error)
 }
 
 // BlobServer can serve blobs via http.

notifications/listener.go

@@ -2,6 +2,7 @@ package notifications
 
 import (
 	"context"
+	"io"
 	"net/http"
 
 	"github.com/distribution/distribution/v3"
@@ -147,7 +148,7 @@ func (bsl *blobServiceListener) Get(ctx context.Context, dgst digest.Digest) ([]
 	return p, err
 }
 
-func (bsl *blobServiceListener) Open(ctx context.Context, dgst digest.Digest) (distribution.ReadSeekCloser, error) {
+func (bsl *blobServiceListener) Open(ctx context.Context, dgst digest.Digest) (io.ReadSeekCloser, error) {
 	rc, err := bsl.BlobStore.Open(ctx, dgst)
 	if err == nil {
 		if desc, err := bsl.Stat(ctx, dgst); err != nil {

registry/client/repository.go

@@ -676,7 +676,7 @@ func (bs *blobs) Get(ctx context.Context, dgst digest.Digest) ([]byte, error) {
 	return io.ReadAll(reader)
 }
 
-func (bs *blobs) Open(ctx context.Context, dgst digest.Digest) (distribution.ReadSeekCloser, error) {
+func (bs *blobs) Open(ctx context.Context, dgst digest.Digest) (io.ReadSeekCloser, error) {
 	ref, err := reference.WithDigest(bs.name, dgst)
 	if err != nil {
 		return nil, err
@@ -686,13 +686,12 @@ func (bs *blobs) Open(ctx context.Context, dgst digest.Digest) (distribution.Rea
 		return nil, err
 	}
 
-	return transport.NewHTTPReadSeeker(ctx, bs.client, blobURL,
+	return transport.NewHTTPReadSeeker(ctx, bs.client, blobURL, func(resp *http.Response) error {
-		func(resp *http.Response) error {
+		if resp.StatusCode == http.StatusNotFound {
-			if resp.StatusCode == http.StatusNotFound {
+			return distribution.ErrBlobUnknown
-				return distribution.ErrBlobUnknown
+		}
-			}
+		return HandleErrorResponse(resp)
-			return HandleErrorResponse(resp)
+	}), nil
-		}), nil
 }
 
 func (bs *blobs) ServeBlob(ctx context.Context, w http.ResponseWriter, r *http.Request, dgst digest.Digest) error {

registry/proxy/proxyblobstore.go

@@ -213,7 +213,7 @@ func (pbs *proxyBlobStore) Mount(ctx context.Context, sourceRepo reference.Named
 	return distribution.Descriptor{}, distribution.ErrUnsupported
 }
 
-func (pbs *proxyBlobStore) Open(ctx context.Context, dgst digest.Digest) (distribution.ReadSeekCloser, error) {
+func (pbs *proxyBlobStore) Open(ctx context.Context, dgst digest.Digest) (io.ReadSeekCloser, error) {
 	return nil, distribution.ErrUnsupported
 }
 

registry/proxy/proxyblobstore_test.go

@@ -2,6 +2,7 @@ package proxy
 
 import (
 	"context"
+	"io"
 	"math/rand"
 	"net/http"
 	"net/http/httptest"
@@ -58,7 +59,7 @@ func (sbs statsBlobStore) Resume(ctx context.Context, id string) (distribution.B
 	return sbs.blobs.Resume(ctx, id)
 }
 
-func (sbs statsBlobStore) Open(ctx context.Context, dgst digest.Digest) (distribution.ReadSeekCloser, error) {
+func (sbs statsBlobStore) Open(ctx context.Context, dgst digest.Digest) (io.ReadSeekCloser, error) {
 	sbsMu.Lock()
 	sbs.stats["open"]++
 	sbsMu.Unlock()

registry/storage/blobstore.go

@@ -2,6 +2,7 @@ package storage
 
 import (
 	"context"
+	"io"
 	"path"
 
 	"github.com/distribution/distribution/v3"
@@ -41,7 +42,7 @@ func (bs *blobStore) Get(ctx context.Context, dgst digest.Digest) ([]byte, error
 	return p, nil
 }
 
-func (bs *blobStore) Open(ctx context.Context, dgst digest.Digest) (distribution.ReadSeekCloser, error) {
+func (bs *blobStore) Open(ctx context.Context, dgst digest.Digest) (io.ReadSeekCloser, error) {
 	desc, err := bs.statter.Stat(ctx, dgst)
 	if err != nil {
 		return nil, err

registry/storage/linkedblobstore.go

@@ -3,6 +3,7 @@ package storage
 import (
 	"context"
 	"fmt"
+	"io"
 	"net/http"
 	"path"
 	"time"
@@ -57,7 +58,7 @@ func (lbs *linkedBlobStore) Get(ctx context.Context, dgst digest.Digest) ([]byte
 	return lbs.blobStore.Get(ctx, canonical.Digest)
 }
 
-func (lbs *linkedBlobStore) Open(ctx context.Context, dgst digest.Digest) (distribution.ReadSeekCloser, error) {
+func (lbs *linkedBlobStore) Open(ctx context.Context, dgst digest.Digest) (io.ReadSeekCloser, error) {
 	canonical, err := lbs.Stat(ctx, dgst) // access check
 	if err != nil {
 		return nil, err