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// Copyright 2020 Google LLC All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package partial
import (
"fmt"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/match"
)
// FindManifests given a v1.ImageIndex, find the manifests that fit the matcher.
func FindManifests(index v1.ImageIndex, matcher match.Matcher) ([]v1.Descriptor, error) {
// get the actual manifest list
indexManifest, err := index.IndexManifest()
if err != nil {
return nil, fmt.Errorf("unable to get raw index: %w", err)
}
manifests := []v1.Descriptor{}
// try to get the root of our image
for _, manifest := range indexManifest.Manifests {
if matcher(manifest) {
manifests = append(manifests, manifest)
}
}
return manifests, nil
}
// FindImages given a v1.ImageIndex, find the images that fit the matcher. If a Descriptor
// matches the provider Matcher, but the referenced item is not an Image, ignores it.
// Only returns those that match the Matcher and are images.
func FindImages(index v1.ImageIndex, matcher match.Matcher) ([]v1.Image, error) {
matches := []v1.Image{}
manifests, err := FindManifests(index, matcher)
if err != nil {
return nil, err
}
for _, desc := range manifests {
// if it is not an image, ignore it
if !desc.MediaType.IsImage() {
continue
}
img, err := index.Image(desc.Digest)
if err != nil {
return nil, err
}
matches = append(matches, img)
}
return matches, nil
}
// FindIndexes given a v1.ImageIndex, find the indexes that fit the matcher. If a Descriptor
// matches the provider Matcher, but the referenced item is not an Index, ignores it.
// Only returns those that match the Matcher and are indexes.
func FindIndexes(index v1.ImageIndex, matcher match.Matcher) ([]v1.ImageIndex, error) {
matches := []v1.ImageIndex{}
manifests, err := FindManifests(index, matcher)
if err != nil {
return nil, err
}
for _, desc := range manifests {
if !desc.MediaType.IsIndex() {
continue
}
// if it is not an index, ignore it
idx, err := index.ImageIndex(desc.Digest)
if err != nil {
return nil, err
}
matches = append(matches, idx)
}
return matches, nil
}
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