51 lines
1.8 KiB
Go
51 lines
1.8 KiB
Go
/*
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Copyright 2017 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 util
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import (
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"github.com/docker/distribution/reference"
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)
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// NormalizeImageRef normalizes the image reference following the docker convention. This is added
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// mainly for backward compatibility.
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// The reference returned can only be either tagged or digested. For reference contains both tag
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// and digest, the function returns digested reference, e.g. docker.io/library/busybox:latest@
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// sha256:7cc4b5aefd1d0cadf8d97d4350462ba51c694ebca145b08d7d41b41acc8db5aa will be returned as
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// docker.io/library/busybox@sha256:7cc4b5aefd1d0cadf8d97d4350462ba51c694ebca145b08d7d41b41acc8db5aa.
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func NormalizeImageRef(ref string) (reference.Named, error) {
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named, err := reference.ParseNormalizedNamed(ref)
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if err != nil {
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return nil, err
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}
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if _, ok := named.(reference.NamedTagged); ok {
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if canonical, ok := named.(reference.Canonical); ok {
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// The reference is both tagged and digested, only
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// return digested.
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newNamed, err := reference.WithName(canonical.Name())
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if err != nil {
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return nil, err
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}
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newCanonical, err := reference.WithDigest(newNamed, canonical.Digest())
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if err != nil {
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return nil, err
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}
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return newCanonical, nil
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}
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}
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return reference.TagNameOnly(named), nil
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}
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