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Switch to SHA256 as canonical digest

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Also support client digests linking to canonical digest.
This commit is contained in:
Josh Hawn 2015-03-04 16:31:31 -08:00 committed by David Lawrence
parent 0233da8b35
commit 98daae176a
2 changed files with 26 additions and 34 deletions
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54
docs/storage/layerupload.go
View file

@ -11,7 +11,6 @@ import (
ctxu "github.com/docker/distribution/context"
"github.com/docker/distribution/digest"
storagedriver "github.com/docker/distribution/registry/storage/driver"
"github.com/docker/docker/pkg/tarsum"
)
// layerUploadController is used to control the various aspects of resumable
@ -61,7 +60,7 @@ func (luc *layerUploadController) Finish(digest digest.Digest) (distribution.Lay
}
// Link the layer blob into the repository.
if err := luc.linkLayer(canonical); err != nil {
if err := luc.linkLayer(canonical, digest); err != nil {
return nil, err
}
@ -86,23 +85,6 @@ func (luc *layerUploadController) Cancel() error {
// validateLayer checks the layer data against the digest, returning an error
// if it does not match. The canonical digest is returned.
func (luc *layerUploadController) validateLayer(dgst digest.Digest) (digest.Digest, error) {
// First, check the incoming tarsum version of the digest.
version, err := tarsum.GetVersionFromTarsum(dgst.String())
if err != nil {
return "", err
}
// TODO(stevvooe): Should we push this down into the digest type?
switch version {
case tarsum.Version1:
default:
// version 0 and dev, for now.
return "", distribution.ErrLayerInvalidDigest{
Digest: dgst,
Reason: distribution.ErrLayerTarSumVersionUnsupported,
}
}
digestVerifier := digest.NewDigestVerifier(dgst)
// TODO(stevvooe): Store resumable hash calculations in upload directory
@ -122,7 +104,7 @@ func (luc *layerUploadController) validateLayer(dgst digest.Digest) (digest.Dige
// sink. Instead, its read driven. This might be okay.
// Calculate an updated digest with the latest version.
canonical, err := digest.FromTarArchive(tr)
canonical, err := digest.FromReader(tr)
if err != nil {
return "", err
}
@ -195,17 +177,33 @@ func (luc *layerUploadController) moveLayer(dgst digest.Digest) error {
// linkLayer links a valid, written layer blob into the registry under the
// named repository for the upload controller.
func (luc *layerUploadController) linkLayer(digest digest.Digest) error {
layerLinkPath, err := luc.layerStore.repository.registry.pm.path(layerLinkPathSpec{
name: luc.layerStore.repository.Name(),
digest: digest,
})
func (luc *layerUploadController) linkLayer(canonical digest.Digest, aliases ...digest.Digest) error {
dgsts := append([]digest.Digest{canonical}, aliases...)
if err != nil {
return err
// Don't make duplicate links.
seenDigests := make(map[digest.Digest]struct{}, len(dgsts))
for _, dgst := range dgsts {
if _, seen := seenDigests[dgst]; seen {
continue
}
seenDigests[dgst] = struct{}{}
layerLinkPath, err := luc.layerStore.repository.registry.pm.path(layerLinkPathSpec{
name: luc.layerStore.repository.Name(),
digest: dgst,
})
if err != nil {
return err
}
if err := luc.layerStore.repository.registry.driver.PutContent(layerLinkPath, []byte(canonical)); err != nil {
return err
}
}
return luc.layerStore.repository.registry.driver.PutContent(layerLinkPath, []byte(digest))
return nil
}
// removeResources should clean up all resources associated with the upload

6
docs/storage/paths.go
View file

@ -232,12 +232,6 @@ func (pm *pathMapper) path(spec pathSpec) (string, error) {
return "", err
}
// For now, only map tarsum paths.
if components[0] != "tarsum" {
// Only tarsum is supported, for now
return "", fmt.Errorf("unsupported content digest: %v", v.digest)
}
layerLinkPathComponents := append(repoPrefix, v.name, "_layers")
return path.Join(path.Join(append(layerLinkPathComponents, components...)...), "link"), nil