1 files changed, 56 insertions, 0 deletions
diff --git a/pkg/crane/get.go b/pkg/crane/get.go
new file mode 100644
index 0000000..1f12f01
--- /dev/null
+++ b/pkg/crane/get.go
@@ -0,0 +1,56 @@
+// Copyright 2018 Google LLC All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package crane
+
+import (
+	"fmt"
+
+	"github.com/google/go-containerregistry/pkg/name"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+	"github.com/google/go-containerregistry/pkg/v1/remote"
+)
+
+func getImage(r string, opt ...Option) (v1.Image, name.Reference, error) {
+	o := makeOptions(opt...)
+	ref, err := name.ParseReference(r, o.Name...)
+	if err != nil {
+		return nil, nil, fmt.Errorf("parsing reference %q: %w", r, err)
+	}
+	img, err := remote.Image(ref, o.Remote...)
+	if err != nil {
+		return nil, nil, fmt.Errorf("reading image %q: %w", ref, err)
+	}
+	return img, ref, nil
+}
+
+func getManifest(r string, opt ...Option) (*remote.Descriptor, error) {
+	o := makeOptions(opt...)
+	ref, err := name.ParseReference(r, o.Name...)
+	if err != nil {
+		return nil, fmt.Errorf("parsing reference %q: %w", r, err)
+	}
+	return remote.Get(ref, o.Remote...)
+}
+
+// Head performs a HEAD request for a manifest and returns a content descriptor
+// based on the registry's response.
+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...)
+}