1 files changed, 73 insertions, 0 deletions
diff --git a/cmd/crane/cmd/validate.go b/cmd/crane/cmd/validate.go
new file mode 100644
index 0000000..4a4acbd
--- /dev/null
+++ b/cmd/crane/cmd/validate.go
@@ -0,0 +1,73 @@
+// 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 cmd
+
+import (
+	"fmt"
+
+	"github.com/google/go-containerregistry/pkg/crane"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+	"github.com/google/go-containerregistry/pkg/v1/tarball"
+	"github.com/google/go-containerregistry/pkg/v1/validate"
+	"github.com/spf13/cobra"
+)
+
+// NewCmdValidate creates a new cobra.Command for the validate subcommand.
+func NewCmdValidate(options *[]crane.Option) *cobra.Command {
+	var (
+		tarballPath, remoteRef string
+		fast                   bool
+	)
+
+	validateCmd := &cobra.Command{
+		Use:   "validate",
+		Short: "Validate that an image is well-formed",
+		Args:  cobra.ExactArgs(0),
+		RunE: func(_ *cobra.Command, args []string) error {
+			for flag, maker := range map[string]func(string, ...crane.Option) (v1.Image, error){
+				tarballPath: makeTarball,
+				remoteRef:   crane.Pull,
+			} {
+				if flag == "" {
+					continue
+				}
+				img, err := maker(flag, *options...)
+				if err != nil {
+					return fmt.Errorf("failed to read image %s: %w", flag, err)
+				}
+
+				opt := []validate.Option{}
+				if fast {
+					opt = append(opt, validate.Fast)
+				}
+				if err := validate.Image(img, opt...); err != nil {
+					fmt.Printf("FAIL: %s: %v\n", flag, err)
+					return err
+				}
+				fmt.Printf("PASS: %s\n", flag)
+			}
+			return nil
+		},
+	}
+	validateCmd.Flags().StringVar(&tarballPath, "tarball", "", "Path to tarball to validate")
+	validateCmd.Flags().StringVar(&remoteRef, "remote", "", "Name of remote image to validate")
+	validateCmd.Flags().BoolVar(&fast, "fast", false, "Skip downloading/digesting layers")
+
+	return validateCmd
+}
+
+func makeTarball(path string, _ ...crane.Option) (v1.Image, error) {
+	return tarball.ImageFromPath(path, nil)
+}