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55 lines
1.4 KiB
Go
55 lines
1.4 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package parsers
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import (
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"fmt"
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dockerref "github.com/docker/distribution/reference"
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)
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const (
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DefaultImageTag = "latest"
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)
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// ParseImageName parses a docker image string into three parts: repo, tag and digest.
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// If both tag and digest are empty, a default image tag will be returned.
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func ParseImageName(image string) (string, string, string, error) {
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named, err := dockerref.ParseNamed(image)
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if err != nil {
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return "", "", "", fmt.Errorf("couldn't parse image name: %v", err)
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}
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repoToPull := named.Name()
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var tag, digest string
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tagged, ok := named.(dockerref.Tagged)
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if ok {
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tag = tagged.Tag()
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}
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digested, ok := named.(dockerref.Digested)
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if ok {
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digest = digested.Digest().String()
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}
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// If no tag was specified, use the default "latest".
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if len(tag) == 0 && len(digest) == 0 {
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tag = DefaultImageTag
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}
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return repoToPull, tag, digest, nil
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}
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