Add private.ImageDestination.NoteOriginalOCIConfig

For now, this only adds the API, nothing actually benefits from
it yet.

Signed-off-by: Miloslav Trmač <mitr@redhat.com>

copy/single.go

@@ -109,7 +109,7 @@ func (c *copier) copySingleImage(ctx context.Context, unparsedImage *image.Unpar
 		}
 	}
 
-	if err := checkImageDestinationForCurrentRuntime(ctx, c.options.DestinationCtx, src, c.dest); err != nil {
+	if err := prepareImageConfigForDest(ctx, c.options.DestinationCtx, src, c.dest); err != nil {
 		return copySingleImageResult{}, err
 	}
 
@@ -316,12 +316,15 @@ func (c *copier) copySingleImage(ctx context.Context, unparsedImage *image.Unpar
 	return res, nil
 }
 
-// checkImageDestinationForCurrentRuntime enforces dest.MustMatchRuntimeOS, if necessary.
-func checkImageDestinationForCurrentRuntime(ctx context.Context, sys *types.SystemContext, src types.Image, dest types.ImageDestination) error {
+// prepareImageConfigForDest enforces dest.MustMatchRuntimeOS and handles dest.NoteOriginalOCIConfig, if necessary.
+func prepareImageConfigForDest(ctx context.Context, sys *types.SystemContext, src types.Image, dest private.ImageDestination) error {
+	ociConfig, configErr := src.OCIConfig(ctx)
+	// Do not fail on configErr here, this might be an artifact
+	// and maybe nothing needs this to be a container image and to process the config.
+
 	if dest.MustMatchRuntimeOS() {
-		c, err := src.OCIConfig(ctx)
-		if err != nil {
-			return fmt.Errorf("parsing image configuration: %w", err)
+		if configErr != nil {
+			return fmt.Errorf("parsing image configuration: %w", configErr)
 		}
 		wantedPlatforms := platform.WantedPlatforms(sys)
 
@@ -331,7 +334,7 @@ func checkImageDestinationForCurrentRuntime(ctx context.Context, sys *types.Syst
 			// For a transitional period, this might trigger warnings because the Variant
 			// field was added to OCI config only recently. If this turns out to be too noisy,
 			// revert this check to only look for (OS, Architecture).
-			if platform.MatchesPlatform(c.Platform, wantedPlatform) {
+			if platform.MatchesPlatform(ociConfig.Platform, wantedPlatform) {
 				match = true
 				break
 			}
@@ -339,9 +342,14 @@ func checkImageDestinationForCurrentRuntime(ctx context.Context, sys *types.Syst
 		}
 		if !match {
 			logrus.Infof("Image operating system mismatch: image uses OS %q+architecture %q+%q, expecting one of %q",
-				c.OS, c.Architecture, c.Variant, strings.Join(options.list, ", "))
+				ociConfig.OS, ociConfig.Architecture, ociConfig.Variant, strings.Join(options.list, ", "))
 		}
 	}
+
+	if err := dest.NoteOriginalOCIConfig(ociConfig, configErr); err != nil {
+		return err
+	}
+
 	return nil
 }
 

directory/directory_dest.go

@@ -29,6 +29,7 @@ var ErrNotContainerImageDir = errors.New("not a containers image directory, don'
 type dirImageDestination struct {
 	impl.Compat
 	impl.PropertyMethodsInitialize
+	stubs.IgnoresOriginalOCIConfig
 	stubs.NoPutBlobPartialInitialize
 	stubs.AlwaysSupportsSignatures
 

docker/docker_image_dest.go

@@ -41,6 +41,7 @@ import (
 type dockerImageDestination struct {
 	impl.Compat
 	impl.PropertyMethodsInitialize
+	stubs.IgnoresOriginalOCIConfig
 	stubs.NoPutBlobPartialInitialize
 
 	ref dockerReference

docker/internal/tarfile/dest.go

@@ -24,6 +24,7 @@ import (
 type Destination struct {
 	impl.Compat
 	impl.PropertyMethodsInitialize
+	stubs.IgnoresOriginalOCIConfig
 	stubs.NoPutBlobPartialInitialize
 	stubs.NoSignaturesInitialize
 

internal/imagedestination/stubs/original_oci_config.go

@@ -0,0 +1,16 @@
+package stubs
+
+import (
+	imgspecv1 "github.com/opencontainers/image-spec/specs-go/v1"
+)
+
+// IgnoresOriginalOCIConfig implements NoteOriginalOCIConfig() that does nothing.
+type IgnoresOriginalOCIConfig struct{}
+
+// NoteOriginalOCIConfig provides the config of the image, as it exists on the source, BUT converted to OCI format,
+// or an error obtaining that value (e.g. if the image is an artifact and not a container image).
+// The destination can use it in its TryReusingBlob/PutBlob implementations
+// (otherwise it only obtains the final config after all layers are written).
+func (stub IgnoresOriginalOCIConfig) NoteOriginalOCIConfig(ociConfig *imgspecv1.Image, configErr error) error {
+	return nil
+}

internal/imagedestination/wrapper.go

@@ -14,6 +14,7 @@ import (
 // wrapped provides the private.ImageDestination operations
 // for a destination that only implements types.ImageDestination
 type wrapped struct {
+	stubs.IgnoresOriginalOCIConfig
 	stubs.NoPutBlobPartialInitialize
 
 	types.ImageDestination

internal/private/private.go

@@ -10,6 +10,7 @@ import (
 	compression "github.com/containers/image/v5/pkg/compression/types"
 	"github.com/containers/image/v5/types"
 	"github.com/opencontainers/go-digest"
+	imgspecv1 "github.com/opencontainers/image-spec/specs-go/v1"
 )
 
 // ImageSourceInternalOnly is the part of private.ImageSource that is not
@@ -41,6 +42,12 @@ type ImageDestinationInternalOnly interface {
 	// FIXME: Add SupportsSignaturesWithFormat or something like that, to allow early failures
 	// on unsupported formats.
 
+	// NoteOriginalOCIConfig provides the config of the image, as it exists on the source, BUT converted to OCI format,
+	// or an error obtaining that value (e.g. if the image is an artifact and not a container image).
+	// The destination can use it in its TryReusingBlob/PutBlob implementations
+	// (otherwise it only obtains the final config after all layers are written).
+	NoteOriginalOCIConfig(ociConfig *imgspecv1.Image, configErr error) error
+
 	// PutBlobWithOptions writes contents of stream and returns data representing the result.
 	// inputInfo.Digest can be optionally provided if known; if provided, and stream is read to the end without error, the digest MUST match the stream contents.
 	// inputInfo.Size is the expected length of stream, if known.

oci/archive/oci_dest.go

@@ -14,6 +14,7 @@ import (
 	"github.com/containers/storage/pkg/archive"
 	"github.com/containers/storage/pkg/idtools"
 	digest "github.com/opencontainers/go-digest"
+	imgspecv1 "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/sirupsen/logrus"
 )
 
@@ -103,6 +104,14 @@ func (d *ociArchiveImageDestination) SupportsPutBlobPartial() bool {
 	return d.unpackedDest.SupportsPutBlobPartial()
 }
 
+// NoteOriginalOCIConfig provides the config of the image, as it exists on the source, BUT converted to OCI format,
+// or an error obtaining that value (e.g. if the image is an artifact and not a container image).
+// The destination can use it in its TryReusingBlob/PutBlob implementations
+// (otherwise it only obtains the final config after all layers are written).
+func (d *ociArchiveImageDestination) NoteOriginalOCIConfig(ociConfig *imgspecv1.Image, configErr error) error {
+	return d.unpackedDest.NoteOriginalOCIConfig(ociConfig, configErr)
+}
+
 // PutBlobWithOptions writes contents of stream and returns data representing the result.
 // inputInfo.Digest can be optionally provided if known; if provided, and stream is read to the end without error, the digest MUST match the stream contents.
 // inputInfo.Size is the expected length of stream, if known.

oci/layout/oci_dest.go

@@ -27,6 +27,7 @@ import (
 type ociImageDestination struct {
 	impl.Compat
 	impl.PropertyMethodsInitialize
+	stubs.IgnoresOriginalOCIConfig
 	stubs.NoPutBlobPartialInitialize
 	stubs.NoSignaturesInitialize
 

openshift/openshift_dest.go

@@ -22,6 +22,7 @@ import (
 	"github.com/containers/image/v5/manifest"
 	"github.com/containers/image/v5/types"
 	"github.com/opencontainers/go-digest"
+	imgspecv1 "github.com/opencontainers/image-spec/specs-go/v1"
 )
 
 type openshiftImageDestination struct {
@@ -111,6 +112,14 @@ func (d *openshiftImageDestination) SupportsPutBlobPartial() bool {
 	return d.docker.SupportsPutBlobPartial()
 }
 
+// NoteOriginalOCIConfig provides the config of the image, as it exists on the source, BUT converted to OCI format,
+// or an error obtaining that value (e.g. if the image is an artifact and not a container image).
+// The destination can use it in its TryReusingBlob/PutBlob implementations
+// (otherwise it only obtains the final config after all layers are written).
+func (d *openshiftImageDestination) NoteOriginalOCIConfig(ociConfig *imgspecv1.Image, configErr error) error {
+	return d.docker.NoteOriginalOCIConfig(ociConfig, configErr)
+}
+
 // PutBlobWithOptions writes contents of stream and returns data representing the result.
 // inputInfo.Digest can be optionally provided if known; if provided, and stream is read to the end without error, the digest MUST match the stream contents.
 // inputInfo.Size is the expected length of stream, if known.

pkg/blobcache/dest.go

@@ -19,6 +19,7 @@ import (
 	"github.com/containers/storage/pkg/archive"
 	"github.com/containers/storage/pkg/ioutils"
 	digest "github.com/opencontainers/go-digest"
+	imgspecv1 "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/sirupsen/logrus"
 )
 
@@ -138,6 +139,14 @@ func (d *blobCacheDestination) HasThreadSafePutBlob() bool {
 	return d.destination.HasThreadSafePutBlob()
 }
 
+// NoteOriginalOCIConfig provides the config of the image, as it exists on the source, BUT converted to OCI format,
+// or an error obtaining that value (e.g. if the image is an artifact and not a container image).
+// The destination can use it in its TryReusingBlob/PutBlob implementations
+// (otherwise it only obtains the final config after all layers are written).
+func (d *blobCacheDestination) NoteOriginalOCIConfig(ociConfig *imgspecv1.Image, configErr error) error {
+	return d.destination.NoteOriginalOCIConfig(ociConfig, configErr)
+}
+
 // PutBlobWithOptions writes contents of stream and returns data representing the result.
 // inputInfo.Digest can be optionally provided if known; if provided, and stream is read to the end without error, the digest MUST match the stream contents.
 // inputInfo.Size is the expected length of stream, if known.

storage/storage_dest.go

@@ -207,6 +207,14 @@ func (s *storageImageDestination) computeNextBlobCacheFile() string {
 	return filepath.Join(s.directory, fmt.Sprintf("%d", s.nextTempFileID.Add(1)))
 }
 
+// NoteOriginalOCIConfig provides the config of the image, as it exists on the source, BUT converted to OCI format,
+// or an error obtaining that value (e.g. if the image is an artifact and not a container image).
+// The destination can use it in its TryReusingBlob/PutBlob implementations
+// (otherwise it only obtains the final config after all layers are written).
+func (s *storageImageDestination) NoteOriginalOCIConfig(ociConfig *imgspecv1.Image, configErr error) error {
+	return nil
+}
+
 // PutBlobWithOptions writes contents of stream and returns data representing the result.
 // inputInfo.Digest can be optionally provided if known; if provided, and stream is read to the end without error, the digest MUST match the stream contents.
 // inputInfo.Size is the expected length of stream, if known.