/
docker_resolver.go
53 lines (48 loc) · 1.63 KB
/
docker_resolver.go
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// Copyright (c) 2016-2019 Uber Technologies, Inc.
//
// 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 tagtype
import (
"bytes"
"fmt"
"github.com/uber/kraken/core"
"github.com/uber/kraken/origin/blobclient"
"github.com/uber/kraken/utils/dockerutil"
"github.com/docker/distribution"
)
type dockerResolver struct {
originClient blobclient.ClusterClient
}
// Resolve returns all layers + manifest of given tag as its dependencies.
func (r *dockerResolver) Resolve(tag string, d core.Digest) (core.DigestList, error) {
m, err := r.downloadManifest(tag, d)
if err != nil {
return nil, err
}
deps, err := dockerutil.GetManifestReferences(m)
if err != nil {
return nil, fmt.Errorf("get manifest references: %s", err)
}
return append(deps, d), nil
}
func (r *dockerResolver) downloadManifest(tag string, d core.Digest) (distribution.Manifest, error) {
buf := &bytes.Buffer{}
if err := r.originClient.DownloadBlob(tag, d, buf); err != nil {
return nil, fmt.Errorf("download blob: %s", err)
}
manifest, _, err := dockerutil.ParseManifestV2(buf)
if err != nil {
return nil, fmt.Errorf("parse manifest: %s", err)
}
return manifest, nil
}