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// 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 (
"errors"
"fmt"
"github.com/google/go-containerregistry/pkg/crane"
"github.com/google/go-containerregistry/pkg/name"
"github.com/spf13/cobra"
)
// NewCmdDigest creates a new cobra.Command for the digest subcommand.
func NewCmdDigest(options *[]crane.Option) *cobra.Command {
var tarball string
var fullRef bool
cmd := &cobra.Command{
Use: "digest IMAGE",
Short: "Get the digest of an image",
Args: cobra.MaximumNArgs(1),
RunE: func(cmd *cobra.Command, args []string) error {
if tarball == "" && len(args) == 0 {
if err := cmd.Help(); err != nil {
return err
}
return errors.New("image reference required without --tarball")
}
if fullRef && tarball != "" {
return errors.New("cannot specify --full-ref with --tarball")
}
digest, err := getDigest(tarball, args, options)
if err != nil {
return err
}
if fullRef {
ref, err := name.ParseReference(args[0])
if err != nil {
return err
}
fmt.Println(ref.Context().Digest(digest))
} else {
fmt.Println(digest)
}
return nil
},
}
cmd.Flags().StringVar(&tarball, "tarball", "", "(Optional) path to tarball containing the image")
cmd.Flags().BoolVar(&fullRef, "full-ref", false, "(Optional) if true, print the full image reference by digest")
return cmd
}
func getDigest(tarball string, args []string, options *[]crane.Option) (string, error) {
if tarball != "" {
return getTarballDigest(tarball, args, options)
}
return crane.Digest(args[0], *options...)
}
func getTarballDigest(tarball string, args []string, options *[]crane.Option) (string, error) {
tag := ""
if len(args) > 0 {
tag = args[0]
}
img, err := crane.LoadTag(tarball, tag, *options...)
if err != nil {
return "", fmt.Errorf("loading image from %q: %w", tarball, err)
}
digest, err := img.Digest()
if err != nil {
return "", fmt.Errorf("computing digest: %w", err)
}
return digest.String(), nil
}
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