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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 crane
import (
"fmt"
"os"
legacy "github.com/google/go-containerregistry/pkg/legacy/tarball"
"github.com/google/go-containerregistry/pkg/name"
v1 "github.com/google/go-containerregistry/pkg/v1"
"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/google/go-containerregistry/pkg/v1/tarball"
)
// Tag applied to images that were pulled by digest. This denotes that the
// image was (probably) never tagged with this, but lets us avoid applying the
// ":latest" tag which might be misleading.
const iWasADigestTag = "i-was-a-digest"
// Pull returns a v1.Image of the remote image src.
func Pull(src string, opt ...Option) (v1.Image, error) {
o := makeOptions(opt...)
ref, err := name.ParseReference(src, o.Name...)
if err != nil {
return nil, fmt.Errorf("parsing reference %q: %w", src, err)
}
return remote.Image(ref, o.Remote...)
}
// Save writes the v1.Image img as a tarball at path with tag src.
func Save(img v1.Image, src, path string) error {
imgMap := map[string]v1.Image{src: img}
return MultiSave(imgMap, path)
}
// MultiSave writes collection of v1.Image img with tag as a tarball.
func MultiSave(imgMap map[string]v1.Image, path string, opt ...Option) error {
o := makeOptions(opt...)
tagToImage := map[name.Tag]v1.Image{}
for src, img := range imgMap {
ref, err := name.ParseReference(src, o.Name...)
if err != nil {
return fmt.Errorf("parsing ref %q: %w", src, err)
}
// WriteToFile wants a tag to write to the tarball, but we might have
// been given a digest.
// If the original ref was a tag, use that. Otherwise, if it was a
// digest, tag the image with :i-was-a-digest instead.
tag, ok := ref.(name.Tag)
if !ok {
d, ok := ref.(name.Digest)
if !ok {
return fmt.Errorf("ref wasn't a tag or digest")
}
tag = d.Repository.Tag(iWasADigestTag)
}
tagToImage[tag] = img
}
// no progress channel (for now)
return tarball.MultiWriteToFile(path, tagToImage)
}
// PullLayer returns the given layer from a registry.
func PullLayer(ref string, opt ...Option) (v1.Layer, error) {
o := makeOptions(opt...)
digest, err := name.NewDigest(ref, o.Name...)
if err != nil {
return nil, err
}
return remote.Layer(digest, o.Remote...)
}
// SaveLegacy writes the v1.Image img as a legacy tarball at path with tag src.
func SaveLegacy(img v1.Image, src, path string) error {
imgMap := map[string]v1.Image{src: img}
return MultiSave(imgMap, path)
}
// MultiSaveLegacy writes collection of v1.Image img with tag as a legacy tarball.
func MultiSaveLegacy(imgMap map[string]v1.Image, path string) error {
refToImage := map[name.Reference]v1.Image{}
for src, img := range imgMap {
ref, err := name.ParseReference(src)
if err != nil {
return fmt.Errorf("parsing ref %q: %w", src, err)
}
refToImage[ref] = img
}
w, err := os.Create(path)
if err != nil {
return err
}
defer w.Close()
return legacy.MultiWrite(refToImage, w)
}
// SaveOCI writes the v1.Image img as an OCI Image Layout at path. If a layout
// already exists at that path, it will add the image to the index.
func SaveOCI(img v1.Image, path string) error {
imgMap := map[string]v1.Image{"": img}
return MultiSaveOCI(imgMap, path)
}
// MultiSaveOCI writes collection of v1.Image img as an OCI Image Layout at path. If a layout
// already exists at that path, it will add the image to the index.
func MultiSaveOCI(imgMap map[string]v1.Image, path string) error {
p, err := layout.FromPath(path)
if err != nil {
p, err = layout.Write(path, empty.Index)
if err != nil {
return err
}
}
for _, img := range imgMap {
if err = p.AppendImage(img); err != nil {
return err
}
}
return nil
}
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