// 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 daemon import ( "fmt" "io" "github.com/google/go-containerregistry/pkg/name" v1 "github.com/google/go-containerregistry/pkg/v1" "github.com/google/go-containerregistry/pkg/v1/tarball" ) // Tag adds a tag to an already existent image. func Tag(src, dest name.Tag, options ...Option) error { o, err := makeOptions(options...) if err != nil { return err } return o.client.ImageTag(o.ctx, src.String(), dest.String()) } // Write saves the image into the daemon as the given tag. func Write(tag name.Tag, img v1.Image, options ...Option) (string, error) { o, err := makeOptions(options...) if err != nil { return "", err } // If we already have this image by this image ID, we can skip loading it. id, err := img.ConfigName() if err != nil { return "", fmt.Errorf("computing image ID: %w", err) } if resp, _, err := o.client.ImageInspectWithRaw(o.ctx, id.String()); err == nil { want := tag.String() // If we already have this tag, we can skip tagging it. for _, have := range resp.RepoTags { if have == want { return "", nil } } return "", o.client.ImageTag(o.ctx, id.String(), want) } pr, pw := io.Pipe() go func() { pw.CloseWithError(tarball.Write(tag, img, pw)) }() // write the image in docker save format first, then load it resp, err := o.client.ImageLoad(o.ctx, pr, false) if err != nil { return "", fmt.Errorf("error loading image: %w", err) } defer resp.Body.Close() b, err := io.ReadAll(resp.Body) response := string(b) if err != nil { return response, fmt.Errorf("error reading load response body: %w", err) } return response, nil }