diff --git a/metropolis/test/localregistry/localregistry.go b/metropolis/test/localregistry/localregistry.go
new file mode 100644
index 0000000..120eb61
--- /dev/null
+++ b/metropolis/test/localregistry/localregistry.go
@@ -0,0 +1,172 @@
+// Package localregistry implements a read-only OCI Distribution / Docker
+// V2 container image registry backed by local layers.
+package localregistry
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+	"os"
+	"path/filepath"
+	"regexp"
+	"strconv"
+
+	"github.com/bazelbuild/rules_go/go/runfiles"
+	"github.com/docker/distribution"
+	"github.com/docker/distribution/manifest/manifestlist"
+	"github.com/docker/distribution/manifest/ocischema"
+	"github.com/docker/distribution/manifest/schema2"
+	"github.com/docker/distribution/reference"
+	"github.com/opencontainers/go-digest"
+	"google.golang.org/protobuf/encoding/prototext"
+
+	"source.monogon.dev/metropolis/test/localregistry/spec"
+)
+
+type Server struct {
+	manifests map[string][]byte
+	blobs     map[digest.Digest]blobMeta
+}
+
+type blobMeta struct {
+	filePath      string
+	mediaType     string
+	contentLength int64
+}
+
+func manifestDescriptorFromBazel(image *spec.Image) (manifestlist.ManifestDescriptor, error) {
+	indexPath, err := runfiles.Rlocation(filepath.Join("_main", image.Path, "index.json"))
+	if err != nil {
+		return manifestlist.ManifestDescriptor{}, fmt.Errorf("while locating manifest list file: %w", err)
+	}
+
+	manifestListRaw, err := os.ReadFile(indexPath)
+	if err != nil {
+		return manifestlist.ManifestDescriptor{}, fmt.Errorf("while opening manifest list file: %w", err)
+	}
+
+	var imageManifestList manifestlist.ManifestList
+	if err := json.Unmarshal(manifestListRaw, &imageManifestList); err != nil {
+		return manifestlist.ManifestDescriptor{}, fmt.Errorf("while unmarshaling manifest list for %q: %w", image.Name, err)
+	}
+
+	if len(imageManifestList.Manifests) != 1 {
+		return manifestlist.ManifestDescriptor{}, fmt.Errorf("unexpected manifest list length > 1")
+	}
+
+	return imageManifestList.Manifests[0], nil
+}
+
+func manifestFromBazel(s *Server, image *spec.Image, md manifestlist.ManifestDescriptor) (ocischema.Manifest, error) {
+	manifestPath, err := runfiles.Rlocation(filepath.Join("_main", image.Path, "blobs", md.Digest.Algorithm().String(), md.Digest.Hex()))
+	if err != nil {
+		return ocischema.Manifest{}, fmt.Errorf("while locating manifest file: %w", err)
+	}
+	manifestRaw, err := os.ReadFile(manifestPath)
+	if err != nil {
+		return ocischema.Manifest{}, fmt.Errorf("while opening manifest file: %w", err)
+	}
+
+	var imageManifest ocischema.Manifest
+	if err := json.Unmarshal(manifestRaw, &imageManifest); err != nil {
+		return ocischema.Manifest{}, fmt.Errorf("while unmarshaling manifest for %q: %w", image.Name, err)
+	}
+
+	// For Digest lookups
+	s.manifests[image.Name] = manifestRaw
+	s.manifests[md.Digest.String()] = manifestRaw
+
+	return imageManifest, nil
+}
+
+func addBazelBlobFromDescriptor(s *Server, image *spec.Image, dd distribution.Descriptor) error {
+	path, err := runfiles.Rlocation(filepath.Join("_main", image.Path, "blobs", dd.Digest.Algorithm().String(), dd.Digest.Hex()))
+	if err != nil {
+		return fmt.Errorf("while locating blob: %w", err)
+	}
+	s.blobs[dd.Digest] = blobMeta{filePath: path, mediaType: dd.MediaType, contentLength: dd.Size}
+	return nil
+}
+
+func FromBazelManifest(mb []byte) (*Server, error) {
+	var bazelManifest spec.Manifest
+	if err := prototext.Unmarshal(mb, &bazelManifest); err != nil {
+		log.Fatalf("failed to parse manifest: %v", err)
+	}
+	s := Server{
+		manifests: make(map[string][]byte),
+		blobs:     make(map[digest.Digest]blobMeta),
+	}
+	for _, i := range bazelManifest.Images {
+		md, err := manifestDescriptorFromBazel(i)
+		if err != nil {
+			return nil, err
+		}
+
+		if err := addBazelBlobFromDescriptor(&s, i, md.Descriptor); err != nil {
+			return nil, err
+		}
+
+		m, err := manifestFromBazel(&s, i, md)
+		if err != nil {
+			return nil, err
+		}
+
+		if err := addBazelBlobFromDescriptor(&s, i, m.Config); err != nil {
+			return nil, err
+		}
+		for _, l := range m.Layers {
+			if err := addBazelBlobFromDescriptor(&s, i, l); err != nil {
+				return nil, err
+			}
+		}
+	}
+	return &s, nil
+}
+
+var (
+	versionCheckEp = regexp.MustCompile(`^/v2/$`)
+	manifestEp     = regexp.MustCompile("^/v2/(" + reference.NameRegexp.String() + ")/manifests/(" + reference.TagRegexp.String() + "|" + digest.DigestRegexp.String() + ")$")
+	blobEp         = regexp.MustCompile("^/v2/(" + reference.NameRegexp.String() + ")/blobs/(" + digest.DigestRegexp.String() + ")$")
+)
+
+func (s *Server) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+	if req.Method != http.MethodGet && req.Method != http.MethodHead {
+		w.WriteHeader(http.StatusMethodNotAllowed)
+		fmt.Fprintf(w, "Registry is read-only, only GET and HEAD are allowed\n")
+		return
+	}
+	w.Header().Set("Content-Type", "application/json")
+	if versionCheckEp.MatchString(req.URL.Path) {
+		w.WriteHeader(http.StatusOK)
+		fmt.Fprintf(w, "{}")
+		return
+	} else if matches := manifestEp.FindStringSubmatch(req.URL.Path); len(matches) > 0 {
+		name := matches[1]
+		manifest, ok := s.manifests[name]
+		if !ok {
+			w.WriteHeader(http.StatusNotFound)
+			fmt.Fprintf(w, "Image not found")
+			return
+		}
+		w.Header().Set("Content-Type", schema2.MediaTypeManifest)
+		w.Header().Set("Content-Length", strconv.FormatInt(int64(len(manifest)), 10))
+		w.WriteHeader(http.StatusOK)
+		io.Copy(w, bytes.NewReader(manifest))
+	} else if matches := blobEp.FindStringSubmatch(req.URL.Path); len(matches) > 0 {
+		bm, ok := s.blobs[digest.Digest(matches[2])]
+		if !ok {
+			w.WriteHeader(http.StatusNotFound)
+			fmt.Fprintf(w, "Blob not found")
+			return
+		}
+		w.Header().Set("Content-Type", bm.mediaType)
+		w.Header().Set("Content-Length", strconv.FormatInt(bm.contentLength, 10))
+		http.ServeFile(w, req, bm.filePath)
+	} else {
+		w.WriteHeader(http.StatusNotFound)
+	}
+}