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moby--moby/distribution/pull_v2_windows.go
Derek McGowan 2c60430a3d Use describable interfaces
Replace use of foreign sources with descriptors and describable

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
2016-06-06 17:49:34 -07:00

69 lines
1.8 KiB
Go

// +build windows
package distribution
import (
"encoding/json"
"fmt"
"net/http"
"os"
"github.com/docker/distribution"
"github.com/docker/distribution/context"
"github.com/docker/distribution/manifest/schema1"
"github.com/docker/distribution/manifest/schema2"
"github.com/docker/distribution/registry/client/transport"
"github.com/docker/docker/image"
)
func detectBaseLayer(is image.Store, m *schema1.Manifest, rootFS *image.RootFS) error {
v1img := &image.V1Image{}
if err := json.Unmarshal([]byte(m.History[len(m.History)-1].V1Compatibility), v1img); err != nil {
return err
}
if v1img.Parent == "" {
return fmt.Errorf("Last layer %q does not have a base layer reference", v1img.ID)
}
// There must be an image that already references the baselayer.
for _, img := range is.Map() {
if img.RootFS.Type == image.TypeLayersWithBase && img.RootFS.BaseLayerID() == v1img.Parent {
rootFS.BaseLayer = img.RootFS.BaseLayer
rootFS.Type = image.TypeLayersWithBase
return nil
}
}
return fmt.Errorf("Invalid base layer %q", v1img.Parent)
}
var _ distribution.Describable = &v2LayerDescriptor{}
func (ld *v2LayerDescriptor) Descriptor() distribution.Descriptor {
if ld.src.MediaType == schema2.MediaTypeForeignLayer && len(ld.src.URLs) > 0 {
return ld.src
}
return distribution.Descriptor{}
}
func (ld *v2LayerDescriptor) open(ctx context.Context) (distribution.ReadSeekCloser, error) {
if len(ld.src.URLs) == 0 {
blobs := ld.repo.Blobs(ctx)
return blobs.Open(ctx, ld.digest)
}
var (
err error
rsc distribution.ReadSeekCloser
)
// Find the first URL that results in a 200 result code.
for _, url := range ld.src.URLs {
rsc = transport.NewHTTPReadSeeker(http.DefaultClient, url, nil)
_, err = rsc.Seek(0, os.SEEK_SET)
if err == nil {
break
}
rsc.Close()
rsc = nil
}
return rsc, err
}