github.com/GoogleContainerTools/skaffold@v1.39.18/pkg/skaffold/tag/sha256.go (about)

     1  /*
     2  Copyright 2019 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 tag
    18  
    19  import (
    20  	"context"
    21  
    22  	"github.com/GoogleContainerTools/skaffold/pkg/skaffold/docker"
    23  	"github.com/GoogleContainerTools/skaffold/pkg/skaffold/schema/latest"
    24  )
    25  
    26  // ChecksumTagger tags an image by the sha256 of the image tarball
    27  type ChecksumTagger struct{}
    28  
    29  // GenerateTag returns either the current tag or `latest`.
    30  func (t *ChecksumTagger) GenerateTag(ctx context.Context, image latest.Artifact) (string, error) {
    31  	parsed, err := docker.ParseReference(image.ImageName)
    32  	if err != nil {
    33  		return "", err
    34  	}
    35  
    36  	if parsed.Tag == "" {
    37  		// No supplied tag, so use "latest".
    38  		return "latest", nil
    39  	}
    40  
    41  	// imageName already has a tag
    42  	return "", nil
    43  }