add better generate

Signed-off-by: Jess Frazelle <acidburn@microsoft.com>

vendor/github.com/genuinetools/reg/registry/delete.go

@@ -0,0 +1,47 @@
+package registry
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/docker/distribution/manifest/schema2"
+	ocd "github.com/opencontainers/go-digest"
+)
+
+// Delete removes a repository digest or reference from the registry.
+// https://docs.docker.com/registry/spec/api/#deleting-an-image
+func (r *Registry) Delete(repository, digest string) error {
+	// If digest is not valid try resolving it as a reference
+	if _, err := ocd.Parse(digest); err != nil {
+		digest, err = r.Digest(repository, digest)
+		if err != nil {
+			return err
+		}
+		if digest == "" {
+			return nil
+		}
+	}
+
+	// Delete the image.
+	url := r.url("/v2/%s/manifests/%s", repository, digest)
+	r.Logf("registry.manifests.delete url=%s repository=%s digest=%s",
+		url, repository, digest)
+
+	req, err := http.NewRequest("DELETE", url, nil)
+	if err != nil {
+		return err
+	}
+
+	req.Header.Set("Accept", schema2.MediaTypeManifest)
+	resp, err := r.Client.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode == http.StatusAccepted || resp.StatusCode == http.StatusNotFound {
+		return nil
+	}
+
+	return fmt.Errorf("Got status code: %d", resp.StatusCode)
+}