Implement crane digest using a HEAD request (#784)

google · Oct 13, 2020 · e39e523 · e39e523
1 parent c9d94b7
commit e39e523
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Showing 2 changed files with 10 additions and 1 deletion.
diff --git a/pkg/crane/digest.go b/pkg/crane/digest.go
@@ -16,7 +16,7 @@ package crane
 
 // Digest returns the sha256 hash of the remote image at ref.
 func Digest(ref string, opt ...Option) (string, error) {
-	desc, err := getManifest(ref, opt...)
+	desc, err := head(ref, opt...)
 	if err != nil {
 		return "", err
 	}

diff --git a/pkg/crane/get.go b/pkg/crane/get.go
@@ -43,3 +43,12 @@ func getManifest(r string, opt ...Option) (*remote.Descriptor, error) {
 	}
 	return remote.Get(ref, o.remote...)
 }
+
+func head(r string, opt ...Option) (*v1.Descriptor, error) {
+	o := makeOptions(opt...)
+	ref, err := name.ParseReference(r, o.name...)
+	if err != nil {
+		return nil, err
+	}
+	return remote.Head(ref, o.remote...)
+}