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From a671cf961c82749cd9025e3e9cce772650134a67 Mon Sep 17 00:00:00 2001
From: Liu Hua <sdu.liu@huawei.com>
Date: Thu, 6 Jun 2019 01:13:08 -0400
Subject: [PATCH] docker Support compress when saving images
If add option `-c` when executing command `docker save`,
layer.tar in exported archive will be compressed with
algorithm gzip. Usage like this(we can use command `file`
to check format of the layer.tar):
```
$ docker save -c -o redis.tar redis
$ tar xvf redis.tar
09b9c5a923b810cc524ec5abf9dd65f796e37397005906b5d81c919bf63cb123/
09b9c5a923b810cc524ec5abf9dd65f796e37397005906b5d81c919bf63cb123/VERSION
09b9c5a923b810cc524ec5abf9dd65f796e37397005906b5d81c919bf63cb123/json
09b9c5a923b810cc524ec5abf9dd65f796e37397005906b5d81c919bf63cb123/layer.tar
7613529f37fd6709b0d850a8ebecd13c069a9cb2bbf67babea0769c68172c5c9/
7613529f37fd6709b0d850a8ebecd13c069a9cb2bbf67babea0769c68172c5c9/VERSION
7613529f37fd6709b0d850a8ebecd13c069a9cb2bbf67babea0769c68172c5c9/json
7613529f37fd6709b0d850a8ebecd13c069a9cb2bbf67babea0769c68172c5c9/layer.tar
846767a44c632a336d7204fb30e9215c84fb1ae1df81a557f78e0fc4d1842130/
846767a44c632a336d7204fb30e9215c84fb1ae1df81a557f78e0fc4d1842130/VERSION
846767a44c632a336d7204fb30e9215c84fb1ae1df81a557f78e0fc4d1842130/json
846767a44c632a336d7204fb30e9215c84fb1ae1df81a557f78e0fc4d1842130/layer.tar
98ee6000320c9e7de792f9c17ac39233abd1881bb127f8227719740981742d7e/
98ee6000320c9e7de792f9c17ac39233abd1881bb127f8227719740981742d7e/VERSION
98ee6000320c9e7de792f9c17ac39233abd1881bb127f8227719740981742d7e/json
98ee6000320c9e7de792f9c17ac39233abd1881bb127f8227719740981742d7e/layer.tar
a82ad3e3c9cd9fafcb310870d070fe293448e5a6d5681eafe54c88cb486038fc/
a82ad3e3c9cd9fafcb310870d070fe293448e5a6d5681eafe54c88cb486038fc/VERSION
a82ad3e3c9cd9fafcb310870d070fe293448e5a6d5681eafe54c88cb486038fc/json
a82ad3e3c9cd9fafcb310870d070fe293448e5a6d5681eafe54c88cb486038fc/layer.tar
b047187f532984ce5e2b53a06c09f2621457939f87472673f35d15391ca58188/
b047187f532984ce5e2b53a06c09f2621457939f87472673f35d15391ca58188/VERSION
b047187f532984ce5e2b53a06c09f2621457939f87472673f35d15391ca58188/json
b047187f532984ce5e2b53a06c09f2621457939f87472673f35d15391ca58188/layer.tar
d4f259423416b3c82b46e1caf01829ac3a99a211dfc691c9d862464768112e7f.json
manifest.json
repositories
$ file
b047187f532984ce5e2b53a06c09f2621457939f87472673f35d15391ca58188/layer.tar
b047187f532984ce5e2b53a06c09f2621457939f87472673f35d15391ca58188/layer.tar:
gzip compressed data
```
Change-Id: I9069b5346e4990e90c2f4724841dc3b4f6f5579f
Signed-off-by: Fengtu Wang <wangfengtu@huawei.com>
Signed-off-by: Liu Hua <sdu.liu@huawei.com>
---
.../cli/cli/command/image/client_test.go | 2 +-
components/cli/cli/command/image/save.go | 8 +++++---
.../docker/docker/client/image_save.go | 6 +++++-
.../docker/docker/client/interface.go | 2 +-
.../engine/api/server/router/image/backend.go | 2 +-
.../api/server/router/image/image_routes.go | 4 +++-
components/engine/client/image_save.go | 6 +++++-
components/engine/client/image_save_test.go | 4 ++--
components/engine/client/interface.go | 2 +-
.../engine/daemon/images/image_exporter.go | 4 ++--
components/engine/distribution/push.go | 2 +-
components/engine/distribution/push_v2.go | 2 +-
components/engine/image/image.go | 2 +-
components/engine/image/tarexport/save.go | 18 +++++++++++++++---
.../plugin/authz/authz_plugin_test.go | 2 +-
.../engine/internal/test/daemon/daemon.go | 2 +-
16 files changed, 46 insertions(+), 22 deletions(-)
diff --git a/components/cli/cli/command/image/client_test.go b/components/cli/cli/command/image/client_test.go
index 50e46f4ec1..aa1bf13611 100644
--- a/components/cli/cli/command/image/client_test.go
+++ b/components/cli/cli/command/image/client_test.go
@@ -37,7 +37,7 @@ func (cli *fakeClient) ImageTag(_ context.Context, image, ref string) error {
return nil
}
-func (cli *fakeClient) ImageSave(_ context.Context, images []string) (io.ReadCloser, error) {
+func (cli *fakeClient) ImageSave(_ context.Context, images []string, compress bool) (io.ReadCloser, error) {
if cli.imageSaveFunc != nil {
return cli.imageSaveFunc(images)
}
diff --git a/components/cli/cli/command/image/save.go b/components/cli/cli/command/image/save.go
index ef23ca1bb1..e1b4a21482 100644
--- a/components/cli/cli/command/image/save.go
+++ b/components/cli/cli/command/image/save.go
@@ -13,8 +13,9 @@ import (
)
type saveOptions struct {
- images []string
- output string
+ images []string
+ output string
+ compress bool
}
// NewSaveCommand creates a new `docker save` command
@@ -34,6 +35,7 @@ func NewSaveCommand(dockerCli command.Cli) *cobra.Command {
flags := cmd.Flags()
flags.StringVarP(&opts.output, "output", "o", "", "Write to a file, instead of STDOUT")
+ flags.BoolVarP(&opts.compress, "compress", "c", false, "Compress layers when saving images")
return cmd
}
@@ -48,7 +50,7 @@ func RunSave(dockerCli command.Cli, opts saveOptions) error {
return errors.Wrap(err, "failed to save image")
}
- responseBody, err := dockerCli.Client().ImageSave(context.Background(), opts.images)
+ responseBody, err := dockerCli.Client().ImageSave(context.Background(), opts.images, opts.compress)
if err != nil {
return err
}
diff --git a/components/cli/vendor/github.com/docker/docker/client/image_save.go b/components/cli/vendor/github.com/docker/docker/client/image_save.go
index d1314e4b22..2bbea0f8ff 100644
--- a/components/cli/vendor/github.com/docker/docker/client/image_save.go
+++ b/components/cli/vendor/github.com/docker/docker/client/image_save.go
@@ -8,11 +8,15 @@ import (
// ImageSave retrieves one or more images from the docker host as an io.ReadCloser.
// It's up to the caller to store the images and close the stream.
-func (cli *Client) ImageSave(ctx context.Context, imageIDs []string) (io.ReadCloser, error) {
+func (cli *Client) ImageSave(ctx context.Context, imageIDs []string, compress bool) (io.ReadCloser, error) {
query := url.Values{
"names": imageIDs,
}
+ if compress {
+ query.Set("compress", "1")
+ }
+
resp, err := cli.get(ctx, "/images/get", query, nil)
if err != nil {
return nil, err
diff --git a/components/cli/vendor/github.com/docker/docker/client/interface.go b/components/cli/vendor/github.com/docker/docker/client/interface.go
index b2d5d7bb72..e68f9f6264 100644
--- a/components/cli/vendor/github.com/docker/docker/client/interface.go
+++ b/components/cli/vendor/github.com/docker/docker/client/interface.go
@@ -98,7 +98,7 @@ type ImageAPIClient interface {
ImagePush(ctx context.Context, ref string, options types.ImagePushOptions) (io.ReadCloser, error)
ImageRemove(ctx context.Context, image string, options types.ImageRemoveOptions) ([]types.ImageDeleteResponseItem, error)
ImageSearch(ctx context.Context, term string, options types.ImageSearchOptions) ([]registry.SearchResult, error)
- ImageSave(ctx context.Context, images []string) (io.ReadCloser, error)
+ ImageSave(ctx context.Context, images []string, compress bool) (io.ReadCloser, error)
ImageTag(ctx context.Context, image, ref string) error
ImagesPrune(ctx context.Context, pruneFilter filters.Args) (types.ImagesPruneReport, error)
}
diff --git a/components/engine/api/server/router/image/backend.go b/components/engine/api/server/router/image/backend.go
index 5837f9a9bc..84509d301a 100644
--- a/components/engine/api/server/router/image/backend.go
+++ b/components/engine/api/server/router/image/backend.go
@@ -31,7 +31,7 @@ type imageBackend interface {
type importExportBackend interface {
LoadImage(inTar io.ReadCloser, outStream io.Writer, quiet bool) error
ImportImage(src string, repository, platform string, tag string, msg string, inConfig io.ReadCloser, outStream io.Writer, changes []string) error
- ExportImage(names []string, outStream io.Writer) error
+ ExportImage(names []string, compress bool, outStream io.Writer) error
}
type registryBackend interface {
diff --git a/components/engine/api/server/router/image/image_routes.go b/components/engine/api/server/router/image/image_routes.go
index 85707c06d2..b7bb340e9a 100644
--- a/components/engine/api/server/router/image/image_routes.go
+++ b/components/engine/api/server/router/image/image_routes.go
@@ -159,7 +159,9 @@ func (s *imageRouter) getImagesGet(ctx context.Context, w http.ResponseWriter, r
names = r.Form["names"]
}
- if err := s.backend.ExportImage(names, output); err != nil {
+ compress := httputils.BoolValueOrDefault(r, "compress", false)
+
+ if err := s.backend.ExportImage(names, compress, output); err != nil {
if !output.Flushed() {
return err
}
diff --git a/components/engine/client/image_save.go b/components/engine/client/image_save.go
index d1314e4b22..2bbea0f8ff 100644
--- a/components/engine/client/image_save.go
+++ b/components/engine/client/image_save.go
@@ -8,11 +8,15 @@ import (
// ImageSave retrieves one or more images from the docker host as an io.ReadCloser.
// It's up to the caller to store the images and close the stream.
-func (cli *Client) ImageSave(ctx context.Context, imageIDs []string) (io.ReadCloser, error) {
+func (cli *Client) ImageSave(ctx context.Context, imageIDs []string, compress bool) (io.ReadCloser, error) {
query := url.Values{
"names": imageIDs,
}
+ if compress {
+ query.Set("compress", "1")
+ }
+
resp, err := cli.get(ctx, "/images/get", query, nil)
if err != nil {
return nil, err
diff --git a/components/engine/client/image_save_test.go b/components/engine/client/image_save_test.go
index a40055e583..7325da0c80 100644
--- a/components/engine/client/image_save_test.go
+++ b/components/engine/client/image_save_test.go
@@ -15,7 +15,7 @@ func TestImageSaveError(t *testing.T) {
client := &Client{
client: newMockClient(errorMock(http.StatusInternalServerError, "Server error")),
}
- _, err := client.ImageSave(context.Background(), []string{"nothing"})
+ _, err := client.ImageSave(context.Background(), []string{"nothing"}, false)
if err == nil || err.Error() != "Error response from daemon: Server error" {
t.Fatalf("expected a Server error, got %v", err)
}
@@ -41,7 +41,7 @@ func TestImageSave(t *testing.T) {
}, nil
}),
}
- saveResponse, err := client.ImageSave(context.Background(), []string{"image_id1", "image_id2"})
+ saveResponse, err := client.ImageSave(context.Background(), []string{"image_id1", "image_id2"}, false)
if err != nil {
t.Fatal(err)
}
diff --git a/components/engine/client/interface.go b/components/engine/client/interface.go
index d190f8e58d..5a7b9eb5b8 100644
--- a/components/engine/client/interface.go
+++ b/components/engine/client/interface.go
@@ -98,7 +98,7 @@ type ImageAPIClient interface {
ImagePush(ctx context.Context, ref string, options types.ImagePushOptions) (io.ReadCloser, error)
ImageRemove(ctx context.Context, image string, options types.ImageRemoveOptions) ([]types.ImageDeleteResponseItem, error)
ImageSearch(ctx context.Context, term string, options types.ImageSearchOptions) ([]registry.SearchResult, error)
- ImageSave(ctx context.Context, images []string) (io.ReadCloser, error)
+ ImageSave(ctx context.Context, images []string, compress bool) (io.ReadCloser, error)
ImageTag(ctx context.Context, image, ref string) error
ImagesPrune(ctx context.Context, pruneFilter filters.Args) (types.ImagesPruneReport, error)
}
diff --git a/components/engine/daemon/images/image_exporter.go b/components/engine/daemon/images/image_exporter.go
index 58105dcb71..dbe5811f30 100644
--- a/components/engine/daemon/images/image_exporter.go
+++ b/components/engine/daemon/images/image_exporter.go
@@ -11,9 +11,9 @@ import (
// stream. All images with the given tag and all versions containing
// the same tag are exported. names is the set of tags to export, and
// outStream is the writer which the images are written to.
-func (i *ImageService) ExportImage(names []string, outStream io.Writer) error {
+func (i *ImageService) ExportImage(names []string, compress bool, outStream io.Writer) error {
imageExporter := tarexport.NewTarExporter(i.imageStore, i.layerStores, i.referenceStore, i)
- return imageExporter.Save(names, outStream)
+ return imageExporter.Save(names, compress, outStream)
}
// LoadImage uploads a set of images into the repository. This is the
diff --git a/components/engine/distribution/push.go b/components/engine/distribution/push.go
index eb3bc55974..ca49f22926 100644
--- a/components/engine/distribution/push.go
+++ b/components/engine/distribution/push.go
@@ -158,7 +158,7 @@ func Push(ctx context.Context, ref reference.Named, imagePushConfig *ImagePushCo
// is finished. This allows the caller to make sure the goroutine finishes
// before it releases any resources connected with the reader that was
// passed in.
-func compress(in io.Reader) (io.ReadCloser, chan struct{}) {
+func Compress(in io.Reader) (io.ReadCloser, chan struct{}) {
compressionDone := make(chan struct{})
pipeReader, pipeWriter := io.Pipe()
diff --git a/components/engine/distribution/push_v2.go b/components/engine/distribution/push_v2.go
index 9dc3e7a2a6..f5922d65bf 100644
--- a/components/engine/distribution/push_v2.go
+++ b/components/engine/distribution/push_v2.go
@@ -447,7 +447,7 @@ func (pd *v2PushDescriptor) uploadUsingSession(
switch m := pd.layer.MediaType(); m {
case schema2.MediaTypeUncompressedLayer:
- compressedReader, compressionDone := compress(reader)
+ compressedReader, compressionDone := Compress(reader)
defer func(closer io.Closer) {
closer.Close()
<-compressionDone
diff --git a/components/engine/image/image.go b/components/engine/image/image.go
index 7e0646f072..bb6046b5ec 100644
--- a/components/engine/image/image.go
+++ b/components/engine/image/image.go
@@ -212,7 +212,7 @@ func NewHistory(author, comment, createdBy string, isEmptyLayer bool) History {
type Exporter interface {
Load(io.ReadCloser, io.Writer, bool) error
// TODO: Load(net.Context, io.ReadCloser, <- chan StatusMessage) error
- Save([]string, io.Writer) error
+ Save([]string, bool, io.Writer) error
}
// NewFromJSON creates an Image configuration from json.
diff --git a/components/engine/image/tarexport/save.go b/components/engine/image/tarexport/save.go
index 4e734b3503..0683f1704f 100644
--- a/components/engine/image/tarexport/save.go
+++ b/components/engine/image/tarexport/save.go
@@ -12,6 +12,7 @@ import (
"time"
"github.com/docker/distribution"
+ dd "github.com/docker/docker/distribution"
"github.com/docker/distribution/reference"
"github.com/docker/docker/image"
"github.com/docker/docker/image/v1"
@@ -35,9 +36,10 @@ type saveSession struct {
images map[image.ID]*imageDescriptor
savedLayers map[string]struct{}
diffIDPaths map[layer.DiffID]string // cache every diffID blob to avoid duplicates
+ compress bool
}
-func (l *tarexporter) Save(names []string, outStream io.Writer) error {
+func (l *tarexporter) Save(names []string, compress bool, outStream io.Writer) error {
images, err := l.parseNames(names)
if err != nil {
return err
@@ -45,7 +47,7 @@ func (l *tarexporter) Save(names []string, outStream io.Writer) error {
// Release all the image top layer references
defer l.releaseLayerReferences(images)
- return (&saveSession{tarexporter: l, images: images}).save(outStream)
+ return (&saveSession{tarexporter: l, images: images, compress: compress}).save(outStream)
}
// parseNames will parse the image names to a map which contains image.ID to *imageDescriptor.
@@ -408,7 +410,17 @@ func (s *saveSession) saveLayer(id layer.ChainID, legacyImg image.V1Image, creat
}
defer arch.Close()
- if _, err := io.Copy(tarFile, arch); err != nil {
+ reader := arch
+ var compressionDone chan struct{}
+ if s.compress {
+ reader, compressionDone = dd.Compress(arch)
+ defer func(closer io.Closer) {
+ closer.Close()
+ <-compressionDone
+ }(reader)
+ }
+
+ if _, err := io.Copy(tarFile, reader); err != nil {
return distribution.Descriptor{}, err
}
diff --git a/components/engine/integration/plugin/authz/authz_plugin_test.go b/components/engine/integration/plugin/authz/authz_plugin_test.go
index 105affc1af..c740fc1dbd 100644
--- a/components/engine/integration/plugin/authz/authz_plugin_test.go
+++ b/components/engine/integration/plugin/authz/authz_plugin_test.go
@@ -435,7 +435,7 @@ func TestAuthzPluginEnsureContainerCopyToFrom(t *testing.T) {
func imageSave(client client.APIClient, path, image string) error {
ctx := context.Background()
- responseReader, err := client.ImageSave(ctx, []string{image})
+ responseReader, err := client.ImageSave(ctx, []string{image}, false)
if err != nil {
return err
}
diff --git a/components/engine/internal/test/daemon/daemon.go b/components/engine/internal/test/daemon/daemon.go
index 4f56dff9bb..f16a43de45 100644
--- a/components/engine/internal/test/daemon/daemon.go
+++ b/components/engine/internal/test/daemon/daemon.go
@@ -557,7 +557,7 @@ func (d *Daemon) LoadBusybox(t assert.TestingT) {
defer clientHost.Close()
ctx := context.Background()
- reader, err := clientHost.ImageSave(ctx, []string{"busybox:latest"})
+ reader, err := clientHost.ImageSave(ctx, []string{"busybox:latest"}, false)
assert.NilError(t, err, "failed to download busybox")
defer reader.Close()
--
2.17.1
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