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Enable proxying registries to downgrade fetched manifests to Schema 1.

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Ensure Accept headers are sent with TagService.Get (which hits manifest
endpoints).  Add support for remote Get and Put for the proxied blobstore.

Signed-off-by: Richard Scothern <richard.scothern@gmail.com>
This commit is contained in:
Richard Scothern 2016-02-17 16:32:23 -08:00
parent db7411ff2e
commit 29e0411f00
3 changed files with 77 additions and 7 deletions
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24
docs/client/repository.go
View file

@ -292,9 +292,18 @@ func (t *tags) Get(ctx context.Context, tag string) (distribution.Descriptor, er
if err != nil {
return distribution.Descriptor{}, err
}
var attempts int
resp, err := t.client.Head(u)
req, err := http.NewRequest("HEAD", u, nil)
if err != nil {
return distribution.Descriptor{}, err
}
for _, t := range distribution.ManifestMediaTypes() {
req.Header.Add("Accept", t)
}
var attempts int
resp, err := t.client.Do(req)
check:
if err != nil {
return distribution.Descriptor{}, err
@ -304,7 +313,16 @@ check:
case resp.StatusCode >= 200 && resp.StatusCode < 400:
return descriptorFromResponse(resp)
case resp.StatusCode == http.StatusMethodNotAllowed:
resp, err = t.client.Get(u)
req, err = http.NewRequest("GET", u, nil)
if err != nil {
return distribution.Descriptor{}, err
}
for _, t := range distribution.ManifestMediaTypes() {
req.Header.Add("Accept", t)
}
resp, err = t.client.Do(req)
attempts++
if attempts > 1 {
return distribution.Descriptor{}, err

26
docs/proxy/proxyblobstore.go
View file

@ -174,6 +174,28 @@ func (pbs *proxyBlobStore) Stat(ctx context.Context, dgst digest.Digest) (distri
return pbs.remoteStore.Stat(ctx, dgst)
}
func (pbs *proxyBlobStore) Get(ctx context.Context, dgst digest.Digest) ([]byte, error) {
blob, err := pbs.localStore.Get(ctx, dgst)
if err == nil {
return blob, nil
}
if err := pbs.authChallenger.tryEstablishChallenges(ctx); err != nil {
return []byte{}, err
}
blob, err = pbs.remoteStore.Get(ctx, dgst)
if err != nil {
return []byte{}, err
}
_, err = pbs.localStore.Put(ctx, "", blob)
if err != nil {
return []byte{}, err
}
return blob, nil
}
// Unsupported functions
func (pbs *proxyBlobStore) Put(ctx context.Context, mediaType string, p []byte) (distribution.Descriptor, error) {
return distribution.Descriptor{}, distribution.ErrUnsupported
@ -195,10 +217,6 @@ func (pbs *proxyBlobStore) Open(ctx context.Context, dgst digest.Digest) (distri
return nil, distribution.ErrUnsupported
}
func (pbs *proxyBlobStore) Get(ctx context.Context, dgst digest.Digest) ([]byte, error) {
return nil, distribution.ErrUnsupported
}
func (pbs *proxyBlobStore) Delete(ctx context.Context, dgst digest.Digest) error {
return distribution.ErrUnsupported
}

34
docs/proxy/proxyblobstore_test.go
View file

@ -218,6 +218,40 @@ func populate(t *testing.T, te *testEnv, blobCount, size, numUnique int) {
te.inRemote = inRemote
te.numUnique = numUnique
}
func TestProxyStoreGet(t *testing.T) {
te := makeTestEnv(t, "foo/bar")
localStats := te.LocalStats()
remoteStats := te.RemoteStats()
populate(t, te, 1, 10, 1)
_, err := te.store.Get(te.ctx, te.inRemote[0].Digest)
if err != nil {
t.Fatal(err)
}
if (*localStats)["get"] != 1 && (*localStats)["put"] != 1 {
t.Errorf("Unexpected local counts")
}
if (*remoteStats)["get"] != 1 {
t.Errorf("Unexpected remote get count")
}
_, err = te.store.Get(te.ctx, te.inRemote[0].Digest)
if err != nil {
t.Fatal(err)
}
if (*localStats)["get"] != 2 && (*localStats)["put"] != 1 {
t.Errorf("Unexpected local counts")
}
if (*remoteStats)["get"] != 1 {
t.Errorf("Unexpected remote get count")
}
}
func TestProxyStoreStat(t *testing.T) {
te := makeTestEnv(t, "foo/bar")