diff options
Diffstat (limited to 'tools/nixery')
| -rw-r--r-- | tools/nixery/main.go | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/tools/nixery/main.go b/tools/nixery/main.go index 8a6d3c3aedaa..39cfbc525528 100644 --- a/tools/nixery/main.go +++ b/tools/nixery/main.go @@ -26,8 +26,11 @@ package main import ( + "context" + "crypto/sha256" "encoding/json" "fmt" + "io" "io/ioutil" "net/http" "regexp" @@ -153,6 +156,38 @@ func (h *registryHandler) serveManifestTag(w http.ResponseWriter, r *http.Reques // field represents valid JSON data. manifest, _ := json.Marshal(buildResult.Manifest) w.Header().Add("Content-Type", manifestMediaType) + + // The manifest needs to be persisted to the blob storage (to become + // available for clients that fetch manifests by their hash, e.g. + // containerd) and served to the client. + // + // Since we have no stable key to address this manifest (it may be + // uncacheable, yet still addressable by blob) we need to separate + // out the hashing, uploading and serving phases. The latter is + // especially important as clients may start to fetch it by digest + // as soon as they see a response. + sha256sum := fmt.Sprintf("%x", sha256.Sum256(manifest)) + path := "layers/" + sha256sum + ctx := context.TODO() + + _, _, err = h.state.Storage.Persist(ctx, path, func(sw io.Writer) (string, int64, error) { + // We already know the hash, so no additional hash needs to be + // constructed here. + written, err := sw.Write(manifest) + return sha256sum, int64(written), err + }) + + if err != nil { + writeError(w, 500, "MANIFEST_UPLOAD", "could not upload manifest to blob store") + + log.WithError(err).WithFields(log.Fields{ + "image": name, + "tag": tag, + }).Error("could not upload manifest") + + return + } + w.Write(manifest) } |