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86 lines
2.6 KiB
86 lines
2.6 KiB
1 year ago
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// Copyright 2020 Google LLC All Rights Reserved.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package partial
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import (
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"fmt"
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v1 "github.com/google/go-containerregistry/pkg/v1"
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"github.com/google/go-containerregistry/pkg/v1/match"
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)
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// FindManifests given a v1.ImageIndex, find the manifests that fit the matcher.
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func FindManifests(index v1.ImageIndex, matcher match.Matcher) ([]v1.Descriptor, error) {
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// get the actual manifest list
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indexManifest, err := index.IndexManifest()
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if err != nil {
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return nil, fmt.Errorf("unable to get raw index: %w", err)
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}
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manifests := []v1.Descriptor{}
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// try to get the root of our image
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for _, manifest := range indexManifest.Manifests {
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if matcher(manifest) {
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manifests = append(manifests, manifest)
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}
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}
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return manifests, nil
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}
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// FindImages given a v1.ImageIndex, find the images that fit the matcher. If a Descriptor
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// matches the provider Matcher, but the referenced item is not an Image, ignores it.
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// Only returns those that match the Matcher and are images.
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func FindImages(index v1.ImageIndex, matcher match.Matcher) ([]v1.Image, error) {
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matches := []v1.Image{}
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manifests, err := FindManifests(index, matcher)
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if err != nil {
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return nil, err
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}
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for _, desc := range manifests {
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// if it is not an image, ignore it
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if !desc.MediaType.IsImage() {
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continue
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}
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img, err := index.Image(desc.Digest)
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if err != nil {
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return nil, err
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}
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matches = append(matches, img)
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}
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return matches, nil
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}
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// FindIndexes given a v1.ImageIndex, find the indexes that fit the matcher. If a Descriptor
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// matches the provider Matcher, but the referenced item is not an Index, ignores it.
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// Only returns those that match the Matcher and are indexes.
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func FindIndexes(index v1.ImageIndex, matcher match.Matcher) ([]v1.ImageIndex, error) {
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matches := []v1.ImageIndex{}
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manifests, err := FindManifests(index, matcher)
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if err != nil {
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return nil, err
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}
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for _, desc := range manifests {
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if !desc.MediaType.IsIndex() {
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continue
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}
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// if it is not an index, ignore it
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idx, err := index.ImageIndex(desc.Digest)
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if err != nil {
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return nil, err
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}
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matches = append(matches, idx)
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}
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return matches, nil
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}
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