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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 (
"fmt"
"github.com/google/go-containerregistry/pkg/crane"
"github.com/google/go-containerregistry/pkg/name"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/cache"
"github.com/google/go-containerregistry/pkg/v1/empty"
"github.com/google/go-containerregistry/pkg/v1/layout"
"github.com/google/go-containerregistry/pkg/v1/remote"
"github.com/spf13/cobra"
)
// NewCmdPull creates a new cobra.Command for the pull subcommand.
func NewCmdPull(options *[]crane.Option) *cobra.Command {
var (
cachePath, format string
annotateRef bool
)
cmd := &cobra.Command{
Use: "pull IMAGE TARBALL",
Short: "Pull remote images by reference and store their contents locally",
Args: cobra.MinimumNArgs(2),
RunE: func(_ *cobra.Command, args []string) error {
imageMap := map[string]v1.Image{}
indexMap := map[string]v1.ImageIndex{}
srcList, path := args[:len(args)-1], args[len(args)-1]
o := crane.GetOptions(*options...)
for _, src := range srcList {
ref, err := name.ParseReference(src, o.Name...)
if err != nil {
return fmt.Errorf("parsing reference %q: %w", src, err)
}
rmt, err := remote.Get(ref, o.Remote...)
if err != nil {
return err
}
// If we're writing an index to a layout and --platform hasn't been set,
// pull the entire index, not just a child image.
if format == "oci" && rmt.MediaType.IsIndex() && o.Platform == nil {
idx, err := rmt.ImageIndex()
if err != nil {
return err
}
indexMap[src] = idx
continue
}
img, err := rmt.Image()
if err != nil {
return err
}
if cachePath != "" {
img = cache.Image(img, cache.NewFilesystemCache(cachePath))
}
imageMap[src] = img
}
switch format {
case "tarball":
if err := crane.MultiSave(imageMap, path); err != nil {
return fmt.Errorf("saving tarball %s: %w", path, err)
}
case "legacy":
if err := crane.MultiSaveLegacy(imageMap, path); err != nil {
return fmt.Errorf("saving legacy tarball %s: %w", path, err)
}
case "oci":
// Don't use crane.MultiSaveOCI so we can control annotations.
p, err := layout.FromPath(path)
if err != nil {
p, err = layout.Write(path, empty.Index)
if err != nil {
return err
}
}
for ref, img := range imageMap {
opts := []layout.Option{}
if annotateRef {
parsed, err := name.ParseReference(ref, o.Name...)
if err != nil {
return err
}
opts = append(opts, layout.WithAnnotations(map[string]string{
"org.opencontainers.image.ref.name": parsed.Name(),
}))
}
if err = p.AppendImage(img, opts...); err != nil {
return err
}
}
for ref, idx := range indexMap {
opts := []layout.Option{}
if annotateRef {
parsed, err := name.ParseReference(ref, o.Name...)
if err != nil {
return err
}
opts = append(opts, layout.WithAnnotations(map[string]string{
"org.opencontainers.image.ref.name": parsed.Name(),
}))
}
if err := p.AppendIndex(idx, opts...); err != nil {
return err
}
}
default:
return fmt.Errorf("unexpected --format: %q (valid values are: tarball, legacy, and oci)", format)
}
return nil
},
}
cmd.Flags().StringVarP(&cachePath, "cache_path", "c", "", "Path to cache image layers")
cmd.Flags().StringVar(&format, "format", "tarball", fmt.Sprintf("Format in which to save images (%q, %q, or %q)", "tarball", "legacy", "oci"))
cmd.Flags().BoolVar(&annotateRef, "annotate-ref", false, "Preserves image reference used to pull as an annotation when used with --format=oci")
return cmd
}
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