1 files changed, 44 insertions, 0 deletions
diff --git a/cmd/crane/cmd/tag.go b/cmd/crane/cmd/tag.go
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+++ b/cmd/crane/cmd/tag.go
@@ -0,0 +1,44 @@
+// Copyright 2019 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 cmd
+
+import (
+	"github.com/google/go-containerregistry/pkg/crane"
+	"github.com/spf13/cobra"
+)
+
+// NewCmdTag creates a new cobra.Command for the tag subcommand.
+func NewCmdTag(options *[]crane.Option) *cobra.Command {
+	return &cobra.Command{
+		Use:   "tag IMG TAG",
+		Short: "Efficiently tag a remote image",
+		Long: `This differs slightly from the "copy" command in a couple subtle ways:
+
+1. You don't have to specify the entire repository for the tag you're adding. For example, these two commands are functionally equivalent:
+` + "```" + `
+crane cp registry.example.com/library/ubuntu:v0 registry.example.com/library/ubuntu:v1
+crane tag registry.example.com/library/ubuntu:v0 v1
+` + "```" + `
+
+2. We can skip layer existence checks because we know the manifest already exists. This makes "tag" slightly faster than "copy".`,
+		Example: `# Add a v1 tag to ubuntu
+crane tag ubuntu v1`,
+		Args: cobra.ExactArgs(2),
+		RunE: func(_ *cobra.Command, args []string) error {
+			img, tag := args[0], args[1]
+			return crane.Tag(img, tag, *options...)
+		},
+	}
+}