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Add checkpoint and restore to client package

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Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
This commit is contained in:
Michael Crosby
2017-06-02 10:31:30 -07:00
parent f105db9626
commit a8c5542ba8
13 changed files with 580 additions and 87 deletions
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64
images/image.go
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@@ -33,34 +33,7 @@ type Store interface {
// The caller can then use the descriptor to resolve and process the
// configuration of the image.
func (image *Image) Config(ctx context.Context, provider content.Provider) (ocispec.Descriptor, error) {
var configDesc ocispec.Descriptor
return configDesc, Walk(ctx, HandlerFunc(func(ctx context.Context, desc ocispec.Descriptor) ([]ocispec.Descriptor, error) {
switch image.Target.MediaType {
case MediaTypeDockerSchema2Manifest, ocispec.MediaTypeImageManifest:
rc, err := provider.Reader(ctx, image.Target.Digest)
if err != nil {
return nil, err
}
defer rc.Close()
p, err := ioutil.ReadAll(rc)
if err != nil {
return nil, err
}
var manifest ocispec.Manifest
if err := json.Unmarshal(p, &manifest); err != nil {
return nil, err
}
configDesc = manifest.Config
return nil, nil
default:
return nil, errors.New("could not resolve config")
}
}), image.Target)
return Config(ctx, provider, image.Target)
}
// RootFS returns the unpacked diffids that make up and images rootfs.
@@ -112,12 +85,43 @@ func (image *Image) Size(ctx context.Context, provider content.Provider) (int64,
}), image.Target)
}
func Config(ctx context.Context, provider content.Provider, image ocispec.Descriptor) (ocispec.Descriptor, error) {
var configDesc ocispec.Descriptor
return configDesc, Walk(ctx, HandlerFunc(func(ctx context.Context, desc ocispec.Descriptor) ([]ocispec.Descriptor, error) {
switch image.MediaType {
case MediaTypeDockerSchema2Manifest, ocispec.MediaTypeImageManifest:
rc, err := provider.Reader(ctx, image.Digest)
if err != nil {
return nil, err
}
defer rc.Close()
p, err := ioutil.ReadAll(rc)
if err != nil {
return nil, err
}
var manifest ocispec.Manifest
if err := json.Unmarshal(p, &manifest); err != nil {
return nil, err
}
configDesc = manifest.Config
return nil, nil
default:
return nil, errors.New("could not resolve config")
}
}), image)
}
// RootFS returns the unpacked diffids that make up and images rootfs.
//
// These are used to verify that a set of layers unpacked to the expected
// values.
func RootFS(ctx context.Context, provider content.Provider, desc ocispec.Descriptor) ([]digest.Digest, error) {
p, err := content.ReadBlob(ctx, provider, desc.Digest)
func RootFS(ctx context.Context, provider content.Provider, configDesc ocispec.Descriptor) ([]digest.Digest, error) {
p, err := content.ReadBlob(ctx, provider, configDesc.Digest)
if err != nil {
return nil, err
}