mirror of https://github.com/k3s-io/k3s
89 lines
2.5 KiB
Go
89 lines
2.5 KiB
Go
/*
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Copyright The containerd 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 service
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import (
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"fmt"
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"strings"
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"github.com/containerd/containerd/reference"
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"github.com/containerd/stargz-snapshotter/fs/source"
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digest "github.com/opencontainers/go-digest"
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ocispec "github.com/opencontainers/image-spec/specs-go/v1"
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)
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const (
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// targetRefLabel is a label which contains image reference passed from CRI plugin.
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targetRefLabel = "containerd.io/snapshot/cri.image-ref"
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// targetDigestLabel is a label which contains layer digest passed from CRI plugin.
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targetDigestLabel = "containerd.io/snapshot/cri.layer-digest"
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// targetImageLayersLabel is a label which contains layer digests contained in
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// the target image and is passed from CRI plugin.
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targetImageLayersLabel = "containerd.io/snapshot/cri.image-layers"
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)
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func sourceFromCRILabels(hosts source.RegistryHosts) source.GetSources {
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return func(labels map[string]string) ([]source.Source, error) {
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refStr, ok := labels[targetRefLabel]
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if !ok {
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return nil, fmt.Errorf("reference hasn't been passed")
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}
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refspec, err := reference.Parse(refStr)
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if err != nil {
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return nil, err
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}
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digestStr, ok := labels[targetDigestLabel]
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if !ok {
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return nil, fmt.Errorf("digest hasn't been passed")
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}
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target, err := digest.Parse(digestStr)
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if err != nil {
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return nil, err
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}
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var layersDgst []digest.Digest
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if l, ok := labels[targetImageLayersLabel]; ok {
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layersStr := strings.Split(l, ",")
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for _, l := range layersStr {
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d, err := digest.Parse(l)
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if err != nil {
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return nil, err
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}
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if d.String() != target.String() {
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layersDgst = append(layersDgst, d)
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}
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}
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}
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var layers []ocispec.Descriptor
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for _, dgst := range append([]digest.Digest{target}, layersDgst...) {
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layers = append(layers, ocispec.Descriptor{Digest: dgst})
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}
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return []source.Source{
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{
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Hosts: hosts,
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Name: refspec,
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Target: ocispec.Descriptor{Digest: target},
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Manifest: ocispec.Manifest{Layers: layers},
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},
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}, nil
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}
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}
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