github.com/GoogleContainerTools/skaffold@v1.39.18/pkg/skaffold/build/buildpacks/fetcher.go (about)

     1  /*
     2  Copyright 2020 The Skaffold Authors
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package buildpacks
    18  
    19  import (
    20  	"context"
    21  	"fmt"
    22  	"io"
    23  
    24  	"github.com/buildpacks/imgutil"
    25  	"github.com/buildpacks/imgutil/local"
    26  	pack "github.com/buildpacks/pack/pkg/client"
    27  	packimg "github.com/buildpacks/pack/pkg/image"
    28  
    29  	"github.com/GoogleContainerTools/skaffold/pkg/skaffold/docker"
    30  )
    31  
    32  var _ pack.ImageFetcher = (*fetcher)(nil)
    33  
    34  type fetcher struct {
    35  	out    io.Writer
    36  	docker docker.LocalDaemon
    37  }
    38  
    39  func newFetcher(out io.Writer, docker docker.LocalDaemon) *fetcher {
    40  	return &fetcher{
    41  		out:    out,
    42  		docker: docker,
    43  	}
    44  }
    45  
    46  func (f *fetcher) Fetch(ctx context.Context, name string, options packimg.FetchOptions) (imgutil.Image, error) {
    47  	if options.PullPolicy == packimg.PullAlways || (options.PullPolicy == packimg.PullIfNotPresent && !f.docker.ImageExists(ctx, name)) {
    48  		if err := f.docker.Pull(ctx, f.out, name); err != nil {
    49  			return nil, err
    50  		}
    51  	}
    52  
    53  	image, err := local.NewImage(name, f.docker.RawClient(), local.FromBaseImage(name))
    54  	if err != nil {
    55  		return nil, err
    56  	}
    57  
    58  	if !image.Found() {
    59  		return nil, fmt.Errorf("image %s does not exist on the daemon", name)
    60  	}
    61  	return image, nil
    62  }