1 files changed, 60 insertions, 0 deletions
diff --git a/pkg/v1/daemon/write.go b/pkg/v1/daemon/write.go
new file mode 100644
index 0000000..48186f6
--- /dev/null
+++ b/pkg/v1/daemon/write.go
@@ -0,0 +1,60 @@
+// 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 daemon
+
+import (
+	"fmt"
+	"io"
+
+	"github.com/google/go-containerregistry/pkg/name"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+	"github.com/google/go-containerregistry/pkg/v1/tarball"
+)
+
+// Tag adds a tag to an already existent image.
+func Tag(src, dest name.Tag, options ...Option) error {
+	o, err := makeOptions(options...)
+	if err != nil {
+		return err
+	}
+
+	return o.client.ImageTag(o.ctx, src.String(), dest.String())
+}
+
+// Write saves the image into the daemon as the given tag.
+func Write(tag name.Tag, img v1.Image, options ...Option) (string, error) {
+	o, err := makeOptions(options...)
+	if err != nil {
+		return "", err
+	}
+
+	pr, pw := io.Pipe()
+	go func() {
+		pw.CloseWithError(tarball.Write(tag, img, pw))
+	}()
+
+	// write the image in docker save format first, then load it
+	resp, err := o.client.ImageLoad(o.ctx, pr, false)
+	if err != nil {
+		return "", fmt.Errorf("error loading image: %w", err)
+	}
+	defer resp.Body.Close()
+	b, err := io.ReadAll(resp.Body)
+	response := string(b)
+	if err != nil {
+		return response, fmt.Errorf("error reading load response body: %w", err)
+	}
+	return response, nil
+}