github.com/alibaba/sealer@v0.8.6-0.20220430115802-37a2bdaa8173/pkg/image/distributionutil/blobmanifest.go (about)

     1  // Copyright © 2021 Alibaba Group Holding Ltd.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package distributionutil
    16  
    17  import (
    18  	"encoding/json"
    19  	"fmt"
    20  
    21  	distribution "github.com/distribution/distribution/v3"
    22  	"github.com/opencontainers/go-digest"
    23  )
    24  
    25  // BlobList this package unmarshal blobs from json into a BlobList struct
    26  //then return a slice of blob digest
    27  type BlobList struct {
    28  	Layers    []distribution.Descriptor `json:"layers"`
    29  	Config    distribution.Descriptor   `json:"config"`
    30  	MediaType string                    `json:"mediaType"`
    31  	Schema    int                       `json:"schemaVersion"`
    32  }
    33  
    34  func GetBlobList(blobListJSON distribution.Manifest) ([]digest.Digest, error) {
    35  	_, list, err := blobListJSON.Payload()
    36  	if err != nil {
    37  		return nil, fmt.Errorf("failed to get blob list: %v", err)
    38  	}
    39  	var blobList BlobList
    40  	err = json.Unmarshal(list, &blobList)
    41  	if err != nil {
    42  		return nil, fmt.Errorf("json unmarshal error: %v", err)
    43  	}
    44  	var blobDigests []digest.Digest
    45  	blobDigests = append(blobDigests, blobList.Config.Digest)
    46  	for _, layer := range blobList.Layers {
    47  		blobDigests = append(blobDigests, layer.Digest)
    48  	}
    49  	return blobDigests, nil
    50  }