// ParseReference parses a reference into either a digest or tag reference
func ParseReference(ref string) Reference {
if strings.Contains(ref, ":") {
dgst, err := digest.ParseDigest(ref)
if err == nil {
return digestReference{digest: dgst}
}
}
return tagReference{tag: ref}
}
// readlink returns the linked digest at path.
func (bs *blobStore) readlink(ctx context.Context, path string) (digest.Digest, error) {
content, err := bs.driver.GetContent(ctx, path)
if err != nil {
return "", err
}
linked, err := digest.ParseDigest(string(content))
if err != nil {
return "", err
}
return linked, nil
}
func getDigest(ctx context.Context) (dgst digest.Digest, err error) {
dgstStr := ctxu.GetStringValue(ctx, "vars.digest")
if dgstStr == "" {
ctxu.GetLogger(ctx).Errorf("digest not available")
return "", errDigestNotAvailable
}
d, err := digest.ParseDigest(dgstStr)
if err != nil {
ctxu.GetLogger(ctx).Errorf("error parsing digest=%q: %v", dgstStr, err)
return "", err
}
return d, nil
}
// imageManifestDispatcher takes the request context and builds the
// appropriate handler for handling image manifest requests.
func imageManifestDispatcher(ctx *Context, r *http.Request) http.Handler {
imageManifestHandler := &imageManifestHandler{
Context: ctx,
}
reference := getReference(ctx)
dgst, err := digest.ParseDigest(reference)
if err != nil {
// We just have a tag
imageManifestHandler.Tag = reference
} else {
imageManifestHandler.Digest = dgst
}
return handlers.MethodHandler{
"GET": http.HandlerFunc(imageManifestHandler.GetImageManifest),
"PUT": http.HandlerFunc(imageManifestHandler.PutImageManifest),
"DELETE": http.HandlerFunc(imageManifestHandler.DeleteImageManifest),
}
}
func (s *signatureStore) Get(dgst digest.Digest) ([][]byte, error) {
signaturesPath, err := s.blobStore.pm.path(manifestSignaturesPathSpec{
name: s.repository.Name(),
revision: dgst,
})
if err != nil {
return nil, err
}
// Need to append signature digest algorithm to path to get all items.
// Perhaps, this should be in the pathMapper but it feels awkward. This
// can be eliminated by implementing listAll on drivers.
signaturesPath = path.Join(signaturesPath, "sha256")
signaturePaths, err := s.blobStore.driver.List(s.ctx, signaturesPath)
if err != nil {
return nil, err
}
var wg sync.WaitGroup
type result struct {
index int
signature []byte
err error
}
ch := make(chan result)
bs := s.linkedBlobStore(s.ctx, dgst)
for i, sigPath := range signaturePaths {
sigdgst, err := digest.ParseDigest("sha256:" + path.Base(sigPath))
if err != nil {
context.GetLogger(s.ctx).Errorf("could not get digest from path: %q, skipping", sigPath)
continue
}
wg.Add(1)
go func(idx int, sigdgst digest.Digest) {
defer wg.Done()
context.GetLogger(s.ctx).
Debugf("fetching signature %q", sigdgst)
r := result{index: idx}
if p, err := bs.Get(s.ctx, sigdgst); err != nil {
context.GetLogger(s.ctx).
Errorf("error fetching signature %q: %v", sigdgst, err)
r.err = err
} else {
r.signature = p
}
ch <- r
}(i, sigdgst)
}
done := make(chan struct{})
go func() {
wg.Wait()
close(done)
}()
// aggregrate the results
signatures := make([][]byte, len(signaturePaths))
loop:
for {
select {
case result := <-ch:
signatures[result.index] = result.signature
if result.err != nil && err == nil {
// only set the first one.
err = result.err
}
case <-done:
break loop
}
}
return signatures, err
}
// PutBlobUploadComplete takes the final request of a blob upload. The
// request may include all the blob data or no blob data. Any data
// provided is received and verified. If successful, the blob is linked
// into the blob store and 201 Created is returned with the canonical
// url of the blob.
func (buh *blobUploadHandler) PutBlobUploadComplete(w http.ResponseWriter, r *http.Request) {
if buh.Upload == nil {
buh.Errors = append(buh.Errors, v2.ErrorCodeBlobUploadUnknown)
return
}
dgstStr := r.FormValue("digest") // TODO(stevvooe): Support multiple digest parameters!
if dgstStr == "" {
// no digest? return error, but allow retry.
buh.Errors = append(buh.Errors, v2.ErrorCodeDigestInvalid.WithDetail("digest missing"))
return
}
dgst, err := digest.ParseDigest(dgstStr)
if err != nil {
// no digest? return error, but allow retry.
buh.Errors = append(buh.Errors, v2.ErrorCodeDigestInvalid.WithDetail("digest parsing failed"))
return
}
// Read in the data, if any.
if _, err := io.Copy(buh.Upload, r.Body); err != nil {
ctxu.GetLogger(buh).Errorf("unknown error copying into upload: %v", err)
buh.Errors = append(buh.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
return
}
desc, err := buh.Upload.Commit(buh, distribution.Descriptor{
Digest: dgst,
// TODO(stevvooe): This isn't wildly important yet, but we should
// really set the length and mediatype. For now, we can let the
// backend take care of this.
})
if err != nil {
switch err := err.(type) {
case distribution.ErrBlobInvalidDigest:
buh.Errors = append(buh.Errors, v2.ErrorCodeDigestInvalid.WithDetail(err))
default:
switch err {
case distribution.ErrBlobInvalidLength, distribution.ErrBlobDigestUnsupported:
buh.Errors = append(buh.Errors, v2.ErrorCodeBlobUploadInvalid.WithDetail(err))
default:
ctxu.GetLogger(buh).Errorf("unknown error completing upload: %#v", err)
buh.Errors = append(buh.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
}
}
// Clean up the backend blob data if there was an error.
if err := buh.Upload.Cancel(buh); err != nil {
// If the cleanup fails, all we can do is observe and report.
ctxu.GetLogger(buh).Errorf("error canceling upload after error: %v", err)
}
return
}
// Build our canonical blob url
blobURL, err := buh.urlBuilder.BuildBlobURL(buh.Repository.Name(), desc.Digest)
if err != nil {
buh.Errors = append(buh.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
return
}
w.Header().Set("Location", blobURL)
w.Header().Set("Content-Length", "0")
w.Header().Set("Docker-Content-Digest", desc.Digest.String())
w.WriteHeader(http.StatusCreated)
}