40 lines
1.2 KiB
Go
40 lines
1.2 KiB
Go
/*
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Copyright 2023 The Kubernetes Authors All rights reserved.
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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 update
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import (
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"fmt"
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"os/exec"
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"strings"
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)
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// GetImageSHA gets the SHA of the provided image
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func GetImageSHA(image string) (string, error) {
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if o, err := exec.Command("docker", "pull", image).CombinedOutput(); err != nil {
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return "", fmt.Errorf("failed to pull image: %v: %s", err, o)
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}
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o, err := exec.Command("docker", "inspect", "--format={{index .RepoDigests 0}}", image).Output()
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if err != nil {
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return "", fmt.Errorf("failed to inspect image: %v: %s", err, o)
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}
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digest := strings.TrimSpace(string(o))
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if !strings.Contains(digest, "@") {
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return "", fmt.Errorf("digest doesn't contain a SHA: %s", digest)
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}
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return strings.Split(digest, "@")[1], nil
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}
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