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images, services/images: implement image service

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Server and Client images of the image store are now provided. We have
created an image metadata interface and converted the bolt functions to
implement that interface over an transaction. A remote client
implementation is provided that implements the same interface.

Signed-off-by: Stephen J Day <stephen.day@docker.com>
This commit is contained in:
Stephen J Day 2017-04-03 18:33:24 -07:00
parent a5c9d6d41b
commit 1ea809dc2a
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GPG key ID: 67B3DED84EDC823F
5 changed files with 280 additions and 45 deletions
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16
images/image.go
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@ -14,8 +14,8 @@ import (
// Image provides the model for how containerd views container images.
type Image struct {
Name string
Descriptor ocispec.Descriptor
Name string
Target ocispec.Descriptor
}
// TODO(stevvooe): Many of these functions make strong platform assumptions,
@ -29,9 +29,9 @@ type Image struct {
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.Descriptor.MediaType {
switch image.Target.MediaType {
case MediaTypeDockerSchema2Manifest, ocispec.MediaTypeImageManifest:
rc, err := provider.Reader(ctx, image.Descriptor.Digest)
rc, err := provider.Reader(ctx, image.Target.Digest)
if err != nil {
return nil, err
}
@ -54,7 +54,7 @@ func (image *Image) Config(ctx context.Context, provider content.Provider) (ocis
return nil, errors.New("could not resolve config")
}
}), image.Descriptor)
}), image.Target)
}
// RootFS returns the unpacked diffids that make up and images rootfs.
@ -91,10 +91,10 @@ func (image *Image) RootFS(ctx context.Context, provider content.Provider) ([]di
func (image *Image) Size(ctx context.Context, provider content.Provider) (int64, error) {
var size int64
return size, Walk(ctx, HandlerFunc(func(ctx context.Context, desc ocispec.Descriptor) ([]ocispec.Descriptor, error) {
switch image.Descriptor.MediaType {
switch image.Target.MediaType {
case MediaTypeDockerSchema2Manifest, ocispec.MediaTypeImageManifest:
size += desc.Size
rc, err := provider.Reader(ctx, image.Descriptor.Digest)
rc, err := provider.Reader(ctx, image.Target.Digest)
if err != nil {
return nil, err
}
@ -121,5 +121,5 @@ func (image *Image) Size(ctx context.Context, provider content.Provider) (int64,
return nil, errors.New("unsupported type")
}
}), image.Descriptor)
}), image.Target)
}