k8s.io/registry.k8s.io@v0.3.1/cmd/geranos/schemav1.go (about)

     1  /*
     2  Copyright 2023 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package main
    18  
    19  import (
    20  	"bytes"
    21  	"encoding/json"
    22  	"fmt"
    23  	"net/http"
    24  
    25  	"github.com/google/go-containerregistry/pkg/name"
    26  	v1 "github.com/google/go-containerregistry/pkg/v1"
    27  	"github.com/google/go-containerregistry/pkg/v1/remote"
    28  )
    29  
    30  // layersForV1 gets the layers for a v1 schema image
    31  func layersForV1(transport http.RoundTripper, ref name.Reference, desc *remote.Descriptor) ([]v1.Layer, error) {
    32  	m := &schema1{}
    33  	if err := json.NewDecoder(bytes.NewReader(desc.Manifest)).Decode(m); err != nil {
    34  		return nil, err
    35  	}
    36  	layers := make([]v1.Layer, len(m.FSLayers))
    37  	for i, fsLayer := range m.FSLayers {
    38  		layerDigest, err := name.NewDigest(fmt.Sprintf("%s@%s", ref.Context(), fsLayer.BlobSum))
    39  		if err != nil {
    40  			return nil, err
    41  		}
    42  		layer, err := remote.Layer(layerDigest, remote.WithTransport(transport))
    43  		if err != nil {
    44  			return nil, err
    45  		}
    46  		layers[i] = layer
    47  	}
    48  	return layers, nil
    49  }
    50  
    51  type fslayer struct {
    52  	BlobSum string `json:"blobSum"`
    53  }
    54  
    55  type schema1 struct {
    56  	FSLayers []fslayer `json:"fsLayers"`
    57  }