Merge pull request #8191 from dmcgowan/transfer-export-image

Transfer export image

api/next.pb.txt

@@ -6857,6 +6857,7 @@ file {
 file {
   name: "github.com/containerd/containerd/api/types/transfer/importexport.proto"
   package: "containerd.types.transfer"
+  dependency: "github.com/containerd/containerd/api/types/platform.proto"
   message_type {
     name: "ImageImportStream"
     field {
@@ -6897,6 +6898,35 @@ file {
       type: TYPE_STRING
       json_name: "mediaType"
     }
+    field {
+      name: "platforms"
+      number: 3
+      label: LABEL_REPEATED
+      type: TYPE_MESSAGE
+      type_name: ".containerd.types.Platform"
+      json_name: "platforms"
+    }
+    field {
+      name: "all_platforms"
+      number: 4
+      label: LABEL_OPTIONAL
+      type: TYPE_BOOL
+      json_name: "allPlatforms"
+    }
+    field {
+      name: "skip_compatibility_manifest"
+      number: 5
+      label: LABEL_OPTIONAL
+      type: TYPE_BOOL
+      json_name: "skipCompatibilityManifest"
+    }
+    field {
+      name: "skip_non_distributable"
+      number: 6
+      label: LABEL_OPTIONAL
+      type: TYPE_BOOL
+      json_name: "skipNonDistributable"
+    }
   }
   options {
     go_package: "github.com/containerd/containerd/api/types/transfer"

api/types/transfer/importexport.pb.go

@@ -22,6 +22,7 @@
 package transfer
 
 import (
+	types "github.com/containerd/containerd/api/types"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
 	reflect "reflect"
@@ -111,6 +112,14 @@ type ImageExportStream struct {
 	// The binary data is expected to be a raw tar stream.
 	Stream    string `protobuf:"bytes,1,opt,name=stream,proto3" json:"stream,omitempty"`
 	MediaType string `protobuf:"bytes,2,opt,name=media_type,json=mediaType,proto3" json:"media_type,omitempty"`
+	// The specified platforms
+	Platforms []*types.Platform `protobuf:"bytes,3,rep,name=platforms,proto3" json:"platforms,omitempty"`
+	// Whether to include all platforms
+	AllPlatforms bool `protobuf:"varint,4,opt,name=all_platforms,json=allPlatforms,proto3" json:"all_platforms,omitempty"`
+	// Skips the creation of the Docker compatible manifest.json file
+	SkipCompatibilityManifest bool `protobuf:"varint,5,opt,name=skip_compatibility_manifest,json=skipCompatibilityManifest,proto3" json:"skip_compatibility_manifest,omitempty"`
+	// Excludes non-distributable blobs such as Windows base layers.
+	SkipNonDistributable bool `protobuf:"varint,6,opt,name=skip_non_distributable,json=skipNonDistributable,proto3" json:"skip_non_distributable,omitempty"`
 }
 
 func (x *ImageExportStream) Reset() {
@@ -159,6 +168,34 @@ func (x *ImageExportStream) GetMediaType() string {
 	return ""
 }
 
+func (x *ImageExportStream) GetPlatforms() []*types.Platform {
+	if x != nil {
+		return x.Platforms
+	}
+	return nil
+}
+
+func (x *ImageExportStream) GetAllPlatforms() bool {
+	if x != nil {
+		return x.AllPlatforms
+	}
+	return false
+}
+
+func (x *ImageExportStream) GetSkipCompatibilityManifest() bool {
+	if x != nil {
+		return x.SkipCompatibilityManifest
+	}
+	return false
+}
+
+func (x *ImageExportStream) GetSkipNonDistributable() bool {
+	if x != nil {
+		return x.SkipNonDistributable
+	}
+	return false
+}
+
 var File_github_com_containerd_containerd_api_types_transfer_importexport_proto protoreflect.FileDescriptor
 
 var file_github_com_containerd_containerd_api_types_transfer_importexport_proto_rawDesc = []byte{
@@ -168,23 +205,40 @@ var file_github_com_containerd_containerd_api_types_transfer_importexport_proto_
 	0x6e, 0x73, 0x66, 0x65, 0x72, 0x2f, 0x69, 0x6d, 0x70, 0x6f, 0x72, 0x74, 0x65, 0x78, 0x70, 0x6f,
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+	0x6f, 0x33,
 }
 
 var (
@@ -203,13 +257,15 @@ var file_github_com_containerd_containerd_api_types_transfer_importexport_proto_
 var file_github_com_containerd_containerd_api_types_transfer_importexport_proto_goTypes = []interface{}{
 	(*ImageImportStream)(nil), // 0: containerd.types.transfer.ImageImportStream
 	(*ImageExportStream)(nil), // 1: containerd.types.transfer.ImageExportStream
+	(*types.Platform)(nil),    // 2: containerd.types.Platform
 }
 var file_github_com_containerd_containerd_api_types_transfer_importexport_proto_depIdxs = []int32{
-	0, // [0:0] is the sub-list for method output_type
+	2, // 0: containerd.types.transfer.ImageExportStream.platforms:type_name -> containerd.types.Platform
-	0, // [0:0] is the sub-list for method input_type
+	1, // [1:1] is the sub-list for method output_type
-	0, // [0:0] is the sub-list for extension type_name
+	1, // [1:1] is the sub-list for method input_type
-	0, // [0:0] is the sub-list for extension extendee
+	1, // [1:1] is the sub-list for extension type_name
-	0, // [0:0] is the sub-list for field type_name
+	1, // [1:1] is the sub-list for extension extendee
+	0, // [0:1] is the sub-list for field type_name
 }
 
 func init() { file_github_com_containerd_containerd_api_types_transfer_importexport_proto_init() }

api/types/transfer/importexport.proto

@@ -20,6 +20,8 @@ package containerd.types.transfer;
 
 option go_package = "github.com/containerd/containerd/api/types/transfer";
 
+import "github.com/containerd/containerd/api/types/platform.proto";
+
 message ImageImportStream {
 	// Stream is used to identify the binary input stream for the import operation.
 	// The stream uses the transfer binary stream protocol with the client as the sender.
@@ -38,4 +40,13 @@ message ImageExportStream {
 	string stream = 1;
 
 	string media_type = 2;
+
+	// The specified platforms
+	repeated types.Platform platforms = 3;
+	// Whether to include all platforms
+	bool all_platforms = 4;
+	// Skips the creation of the Docker compatible manifest.json file
+	bool skip_compatibility_manifest = 5;
+	// Excludes non-distributable blobs such as Windows base layers.
+	bool skip_non_distributable = 6;
 }

cmd/ctr/commands/images/export.go

@@ -22,11 +22,15 @@ import (
 	"io"
 	"os"
 
-	"github.com/containerd/containerd/cmd/ctr/commands"
-	"github.com/containerd/containerd/images/archive"
-	"github.com/containerd/containerd/platforms"
 	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/urfave/cli"
+
+	"github.com/containerd/containerd/cmd/ctr/commands"
+	"github.com/containerd/containerd/images/archive"
+	"github.com/containerd/containerd/pkg/transfer"
+	tarchive "github.com/containerd/containerd/pkg/transfer/archive"
+	"github.com/containerd/containerd/pkg/transfer/image"
+	"github.com/containerd/containerd/platforms"
 )
 
 var exportCommand = cli.Command{
@@ -58,6 +62,10 @@ When '--all-platforms' is given all images in a manifest list must be available.
 			Name:  "all-platforms",
 			Usage: "Exports content from all platforms",
 		},
+		cli.BoolTFlag{
+			Name:  "local",
+			Usage: "run export locally rather than through transfer API",
+		},
 	},
 	Action: func(context *cli.Context) error {
 		var (
@@ -69,6 +77,61 @@ When '--all-platforms' is given all images in a manifest list must be available.
 			return errors.New("please provide both an output filename and an image reference to export")
 		}
 
+		client, ctx, cancel, err := commands.NewClient(context)
+		if err != nil {
+			return err
+		}
+		defer cancel()
+
+		var w io.WriteCloser
+		if out == "-" {
+			w = os.Stdout
+		} else {
+			w, err = os.Create(out)
+			if err != nil {
+				return err
+			}
+		}
+		defer w.Close()
+
+		if !context.BoolT("local") {
+			pf, done := ProgressHandler(ctx, os.Stdout)
+			defer done()
+
+			exportOpts := []tarchive.ExportOpt{}
+			if pss := context.StringSlice("platform"); len(pss) > 0 {
+				for _, ps := range pss {
+					p, err := platforms.Parse(ps)
+					if err != nil {
+						return fmt.Errorf("invalid platform %q: %w", ps, err)
+					}
+					exportOpts = append(exportOpts, tarchive.WithPlatform(p))
+				}
+			}
+			if context.Bool("all-platforms") {
+				exportOpts = append(exportOpts, tarchive.WithAllPlatforms)
+			}
+
+			if context.Bool("skip-manifest-json") {
+				exportOpts = append(exportOpts, tarchive.WithSkipCompatibilityManifest)
+			}
+
+			if context.Bool("skip-non-distributable") {
+				exportOpts = append(exportOpts, tarchive.WithSkipNonDistributableBlobs)
+			}
+
+			storeOpts := []image.StoreOpt{}
+			for _, img := range images {
+				storeOpts = append(storeOpts, image.WithExtraReference(img))
+			}
+
+			return client.Transfer(ctx,
+				image.NewStore("", storeOpts...),
+				tarchive.NewImageExportStream(w, "", exportOpts...),
+				transfer.WithProgress(pf),
+			)
+		}
+
 		if pss := context.StringSlice("platform"); len(pss) > 0 {
 			var all []ocispec.Platform
 			for _, ps := range pss {
@@ -95,28 +158,11 @@ When '--all-platforms' is given all images in a manifest list must be available.
 			exportOpts = append(exportOpts, archive.WithSkipNonDistributableBlobs())
 		}
 
-		client, ctx, cancel, err := commands.NewClient(context)
-		if err != nil {
-			return err
-		}
-		defer cancel()
-
 		is := client.ImageService()
 		for _, img := range images {
 			exportOpts = append(exportOpts, archive.WithImage(is, img))
 		}
 
-		var w io.WriteCloser
-		if out == "-" {
-			w = os.Stdout
-		} else {
-			w, err = os.Create(out)
-			if err != nil {
-				return err
-			}
-		}
-		defer w.Close()
-
 		return client.Export(ctx, w, exportOpts...)
 	},
 }

images/archive/exporter.go

@@ -89,6 +89,18 @@ func WithImage(is images.Store, name string) ExportOpt {
 	}
 }
 
+// WithImages adds multiples images to the exported archive.
+func WithImages(imgs []images.Image) ExportOpt {
+	return func(ctx context.Context, o *exportOptions) error {
+		for _, img := range imgs {
+			img.Target.Annotations = addNameAnnotation(img.Name, img.Target.Annotations)
+			o.manifests = append(o.manifests, img.Target)
+		}
+
+		return nil
+	}
+}
+
 // WithManifest adds a manifest to the exported archive.
 // When names are given they will be set on the manifest in the
 // exported archive, creating an index record for each name.

pkg/transfer/archive/exporter.go

@@ -20,12 +20,19 @@ import (
 	"context"
 	"io"
 
+	"github.com/containerd/typeurl/v2"
+	v1 "github.com/opencontainers/image-spec/specs-go/v1"
+
+	"github.com/containerd/containerd/api/types"
 	transfertypes "github.com/containerd/containerd/api/types/transfer"
+	"github.com/containerd/containerd/content"
+	"github.com/containerd/containerd/images"
+	"github.com/containerd/containerd/images/archive"
 	"github.com/containerd/containerd/log"
 	"github.com/containerd/containerd/pkg/streaming"
 	"github.com/containerd/containerd/pkg/transfer/plugins"
 	tstreaming "github.com/containerd/containerd/pkg/transfer/streaming"
-	"github.com/containerd/typeurl/v2"
+	"github.com/containerd/containerd/platforms"
 )
 
 func init() {
@@ -34,24 +41,74 @@ func init() {
 	plugins.Register(&transfertypes.ImageImportStream{}, &ImageImportStream{})
 }
 
-// NewImageExportStream returns a image importer via tar stream
+type ExportOpt func(*ImageExportStream)
-// TODO: Add export options
+
-func NewImageExportStream(stream io.WriteCloser, mediaType string) *ImageExportStream {
+func WithPlatform(p v1.Platform) ExportOpt {
-	return &ImageExportStream{
+	return func(s *ImageExportStream) {
+		s.platforms = append(s.platforms, p)
+	}
+}
+
+func WithAllPlatforms(s *ImageExportStream) {
+	s.allPlatforms = true
+}
+
+func WithSkipCompatibilityManifest(s *ImageExportStream) {
+	s.skipCompatibilityManifest = true
+}
+
+func WithSkipNonDistributableBlobs(s *ImageExportStream) {
+	s.skipNonDistributable = true
+}
+
+// NewImageExportStream returns an image exporter via tar stream
+func NewImageExportStream(stream io.WriteCloser, mediaType string, opts ...ExportOpt) *ImageExportStream {
+	s := &ImageExportStream{
 		stream:    stream,
 		mediaType: mediaType,
 	}
+	for _, opt := range opts {
+		opt(s)
+	}
+	return s
 }
 
 type ImageExportStream struct {
 	stream    io.WriteCloser
 	mediaType string
+
+	platforms                 []v1.Platform
+	allPlatforms              bool
+	skipCompatibilityManifest bool
+	skipNonDistributable      bool
 }
 
 func (iis *ImageExportStream) ExportStream(context.Context) (io.WriteCloser, string, error) {
 	return iis.stream, iis.mediaType, nil
 }
 
+func (iis *ImageExportStream) Export(ctx context.Context, cs content.Store, imgs []images.Image) error {
+	opts := []archive.ExportOpt{
+		archive.WithImages(imgs),
+	}
+
+	if len(iis.platforms) > 0 {
+		opts = append(opts, archive.WithPlatform(platforms.Ordered(iis.platforms...)))
+	} else {
+		opts = append(opts, archive.WithPlatform(platforms.DefaultStrict()))
+	}
+	if iis.allPlatforms {
+		opts = append(opts, archive.WithAllPlatforms())
+	}
+	if iis.skipCompatibilityManifest {
+		opts = append(opts, archive.WithSkipDockerManifest())
+	}
+	if iis.skipNonDistributable {
+		opts = append(opts, archive.WithSkipNonDistributableBlobs())
+	}
+	return archive.Export(ctx, cs, iis.stream, opts...)
+}
+
 func (iis *ImageExportStream) MarshalAny(ctx context.Context, sm streaming.StreamCreator) (typeurl.Any, error) {
 	sid := tstreaming.GenerateID("export")
 	stream, err := sm.Create(ctx, sid)
@@ -67,9 +124,21 @@ func (iis *ImageExportStream) MarshalAny(ctx context.Context, sm streaming.Strea
 		iis.stream.Close()
 	}()
 
+	var specified []*types.Platform
+	for _, p := range iis.platforms {
+		specified = append(specified, &types.Platform{
+			OS:           p.OS,
+			Architecture: p.Architecture,
+			Variant:      p.Variant,
+		})
+	}
 	s := &transfertypes.ImageExportStream{
 		Stream:                    sid,
 		MediaType:                 iis.mediaType,
+		Platforms:                 specified,
+		AllPlatforms:              iis.allPlatforms,
+		SkipCompatibilityManifest: iis.skipCompatibilityManifest,
+		SkipNonDistributable:      iis.skipNonDistributable,
 	}
 
 	return typeurl.MarshalAny(s)
@@ -87,8 +156,21 @@ func (iis *ImageExportStream) UnmarshalAny(ctx context.Context, sm streaming.Str
 		return err
 	}
 
+	var specified []v1.Platform
+	for _, p := range s.Platforms {
+		specified = append(specified, v1.Platform{
+			OS:           p.OS,
+			Architecture: p.Architecture,
+			Variant:      p.Variant,
+		})
+	}
+
 	iis.stream = tstreaming.WriteByteStream(ctx, stream)
 	iis.mediaType = s.MediaType
+	iis.platforms = specified
+	iis.allPlatforms = s.AllPlatforms
+	iis.skipCompatibilityManifest = s.SkipCompatibilityManifest
+	iis.skipNonDistributable = s.SkipNonDistributable
 
 	return nil
 }

pkg/transfer/image/imagestore.go

@@ -325,6 +325,28 @@ func (is *Store) Get(ctx context.Context, store images.Store) (images.Image, err
 	return store.Get(ctx, is.imageName)
 }
 
+func (is *Store) Lookup(ctx context.Context, store images.Store) ([]images.Image, error) {
+	var imgs []images.Image
+	if is.imageName != "" {
+		img, err := store.Get(ctx, is.imageName)
+		if err != nil {
+			return nil, err
+		}
+		imgs = append(imgs, img)
+	}
+	for _, ref := range is.extraReferences {
+		if ref.IsPrefix {
+			return nil, fmt.Errorf("prefix lookup on export not implemented: %w", errdefs.ErrNotImplemented)
+		}
+		img, err := store.Get(ctx, ref.Name)
+		if err != nil {
+			return nil, err
+		}
+		imgs = append(imgs, img)
+	}
+	return imgs, nil
+}
+
 func (is *Store) UnpackPlatforms() []transfer.UnpackConfiguration {
 	unpacks := make([]transfer.UnpackConfiguration, len(is.unpacks))
 	for i, uc := range is.unpacks {

pkg/transfer/image/imagestore_test.go

@@ -19,6 +19,8 @@ package image
 import (
 	"context"
 	"errors"
+	"sort"
+	"sync"
 	"testing"
 
 	"github.com/containerd/containerd/errdefs"
@@ -222,7 +224,7 @@ func TestStore(t *testing.T) {
 				desc.Annotations["io.containerd.import.ref-source"] = "annotation"
 			}
 			t.Run(name, func(t *testing.T) {
-				imgs, err := testCase.ImageStore.Store(context.Background(), desc, nopImageStore{})
+				imgs, err := testCase.ImageStore.Store(context.Background(), desc, newSimpleImageStore())
 				if err != nil {
 					if testCase.Err == nil {
 						t.Fatal(err)
@@ -252,24 +254,165 @@ func TestStore(t *testing.T) {
 	}
 }
 
-type nopImageStore struct{}
+func TestLookup(t *testing.T) {
+	ctx := context.Background()
+	is := newSimpleImageStore()
+	for _, name := range []string{
+		"registry.io/test1:latest",
+		"registry.io/test1:v1",
+	} {
+		is.Create(ctx, images.Image{
+			Name: name,
+		})
+	}
+	for _, testCase := range []struct {
+		Name       string
+		ImageStore *Store
+		Expected   []string
+		Err        error
+	}{
+		{
+			Name: "SingleImage",
+			ImageStore: &Store{
+				imageName: "registry.io/test1:latest",
+			},
+			Expected: []string{"registry.io/test1:latest"},
+		},
+		{
+			Name: "MultipleReferences",
+			ImageStore: &Store{
+				imageName: "registry.io/test1:latest",
+				extraReferences: []Reference{
+					{
+						Name: "registry.io/test1:v1",
+					},
+				},
+			},
+			Expected: []string{"registry.io/test1:latest", "registry.io/test1:v1"},
+		},
+		{
+			Name: "OnlyReferences",
+			ImageStore: &Store{
+				extraReferences: []Reference{
+					{
+						Name: "registry.io/test1:latest",
+					},
+					{
+						Name: "registry.io/test1:v1",
+					},
+				},
+			},
+			Expected: []string{"registry.io/test1:latest", "registry.io/test1:v1"},
+		},
+		{
+			Name: "UnsupportedPrefix",
+			ImageStore: &Store{
+				extraReferences: []Reference{
+					{
+						Name:     "registry.io/test1:latest",
+						IsPrefix: true,
+					},
+				},
+			},
+			Err: errdefs.ErrNotImplemented,
+		},
+	} {
+		t.Run(testCase.Name, func(t *testing.T) {
+			images, err := testCase.ImageStore.Lookup(ctx, is)
+			if err != nil {
+				if !errors.Is(err, testCase.Err) {
+					t.Errorf("unexpected error %v, expected %v", err, testCase.Err)
+				}
+				return
+			} else if testCase.Err != nil {
+				t.Fatal("expected error")
+			}
+			imageNames := make([]string, len(images))
+			for i, img := range images {
+				imageNames[i] = img.Name
+			}
+			sort.Strings(imageNames)
+			sort.Strings(testCase.Expected)
+			if len(images) != len(testCase.Expected) {
+				t.Fatalf("unexpected images:\n\t%v\nexpected:\n\t%v", imageNames, testCase.Expected)
+			}
+			for i := range imageNames {
+				if imageNames[i] != testCase.Expected[i] {
+					t.Fatalf("unexpected images:\n\t%v\nexpected:\n\t%v", imageNames, testCase.Expected)
+				}
+			}
+		})
+	}
+}
 
-func (nopImageStore) Get(ctx context.Context, name string) (images.Image, error) {
+// simpleImageStore is for testing images in memory,
+// no filter support
+type simpleImageStore struct {
+	l      sync.Mutex
+	images map[string]images.Image
+}
+
+func newSimpleImageStore() images.Store {
+	return &simpleImageStore{
+		images: make(map[string]images.Image),
+	}
+}
+
+func (is *simpleImageStore) Get(ctx context.Context, name string) (images.Image, error) {
+	is.l.Lock()
+	defer is.l.Unlock()
+	img, ok := is.images[name]
+	if !ok {
 		return images.Image{}, errdefs.ErrNotFound
 	}
-
+	return img, nil
-func (nopImageStore) List(ctx context.Context, filters ...string) ([]images.Image, error) {
-	return nil, nil
 }
 
-func (nopImageStore) Create(ctx context.Context, image images.Image) (images.Image, error) {
+func (is *simpleImageStore) List(ctx context.Context, filters ...string) ([]images.Image, error) {
+	is.l.Lock()
+	defer is.l.Unlock()
+	var imgs []images.Image
+
+	// filters not supported, return all
+	for _, img := range is.images {
+		imgs = append(imgs, img)
+	}
+	return imgs, nil
+}
+
+func (is *simpleImageStore) Create(ctx context.Context, image images.Image) (images.Image, error) {
+	is.l.Lock()
+	defer is.l.Unlock()
+
+	if _, ok := is.images[image.Name]; ok {
+		return images.Image{}, errdefs.ErrAlreadyExists
+	}
+	is.images[image.Name] = image
+
 	return image, nil
 }
 
-func (nopImageStore) Update(ctx context.Context, image images.Image, fieldpaths ...string) (images.Image, error) {
+func (is *simpleImageStore) Update(ctx context.Context, image images.Image, fieldpaths ...string) (images.Image, error) {
+	is.l.Lock()
+	defer is.l.Unlock()
+
+	if _, ok := is.images[image.Name]; !ok {
+		return images.Image{}, errdefs.ErrNotFound
+	}
+	// fieldpaths no supported, update entire image
+	is.images[image.Name] = image
+
 	return image, nil
 }
 
-func (nopImageStore) Delete(ctx context.Context, name string, opts ...images.DeleteOpt) error {
+func (is *simpleImageStore) Delete(ctx context.Context, name string, opts ...images.DeleteOpt) error {
+	is.l.Lock()
+	defer is.l.Unlock()
+
+	if _, ok := is.images[name]; !ok {
+		return errdefs.ErrNotFound
+	}
+	delete(is.images, name)
+
 	return nil
 }

pkg/transfer/local/export.go

@@ -0,0 +1,64 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package local
+
+import (
+	"context"
+
+	"github.com/containerd/containerd/images"
+	"github.com/containerd/containerd/pkg/transfer"
+)
+
+func (ts *localTransferService) exportStream(ctx context.Context, ig transfer.ImageGetter, is transfer.ImageExporter, tops *transfer.Config) error {
+	ctx, done, err := ts.withLease(ctx)
+	if err != nil {
+		return err
+	}
+	defer done(ctx)
+
+	if tops.Progress != nil {
+		tops.Progress(transfer.Progress{
+			Event: "Exporting",
+		})
+	}
+
+	var imgs []images.Image
+	if il, ok := ig.(transfer.ImageLookup); ok {
+		imgs, err = il.Lookup(ctx, ts.images)
+		if err != nil {
+			return err
+		}
+	} else {
+		img, err := ig.Get(ctx, ts.images)
+		if err != nil {
+			return err
+		}
+		imgs = append(imgs, img)
+	}
+
+	err = is.Export(ctx, ts.content, imgs)
+	if err != nil {
+		return err
+	}
+
+	if tops.Progress != nil {
+		tops.Progress(transfer.Progress{
+			Event: "Completed export",
+		})
+	}
+	return nil
+}

pkg/transfer/local/transfer.go

@@ -72,6 +72,8 @@ func (ts *localTransferService) Transfer(ctx context.Context, src interface{}, d
 		switch d := dest.(type) {
 		case transfer.ImagePusher:
 			return ts.push(ctx, s, d, topts)
+		case transfer.ImageExporter:
+			return ts.exportStream(ctx, s, d, topts)
 		}
 	case transfer.ImageImporter:
 		switch d := dest.(type) {

pkg/transfer/transfer.go

@@ -69,6 +69,17 @@ type ImageGetter interface {
 	Get(context.Context, images.Store) (images.Image, error)
 }
 
+// ImageLookup is a type which returns images from an image store
+// based on names or prefixes
+type ImageLookup interface {
+	Lookup(context.Context, images.Store) ([]images.Image, error)
+}
+
+// ImageExporter exports images to a writer
+type ImageExporter interface {
+	Export(context.Context, content.Store, []images.Image) error
+}
+
 // ImageImporter imports an image into a content store
 type ImageImporter interface {
 	Import(context.Context, content.Store) (ocispec.Descriptor, error)