schema1.go

Documentation: github.com/google/go-containerregistry/pkg/v1/remote

     1  // Copyright 2023 Google LLC All Rights Reserved.
     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 remote
    16  
    17  import (
    18  	"bytes"
    19  	"context"
    20  	"encoding/json"
    21  
    22  	"github.com/google/go-containerregistry/pkg/name"
    23  	v1 "github.com/google/go-containerregistry/pkg/v1"
    24  	"github.com/google/go-containerregistry/pkg/v1/partial"
    25  	"github.com/google/go-containerregistry/pkg/v1/types"
    26  )
    27  
    28  type schema1 struct {
    29  	ref        name.Reference
    30  	ctx        context.Context
    31  	fetcher    fetcher
    32  	manifest   []byte
    33  	mediaType  types.MediaType
    34  	descriptor *v1.Descriptor
    35  }
    36  
    37  func (s *schema1) Layers() ([]v1.Layer, error) {
    38  	m := schema1Manifest{}
    39  	if err := json.NewDecoder(bytes.NewReader(s.manifest)).Decode(&m); err != nil {
    40  		return nil, err
    41  	}
    42  
    43  	layers := []v1.Layer{}
    44  	for i := len(m.FSLayers) - 1; i >= 0; i-- {
    45  		fsl := m.FSLayers[i]
    46  
    47  		h, err := v1.NewHash(fsl.BlobSum)
    48  		if err != nil {
    49  			return nil, err
    50  		}
    51  		l, err := s.LayerByDigest(h)
    52  		if err != nil {
    53  			return nil, err
    54  		}
    55  		layers = append(layers, l)
    56  	}
    57  
    58  	return layers, nil
    59  }
    60  
    61  func (s *schema1) MediaType() (types.MediaType, error) {
    62  	return s.mediaType, nil
    63  }
    64  
    65  func (s *schema1) Size() (int64, error) {
    66  	return s.descriptor.Size, nil
    67  }
    68  
    69  func (s *schema1) ConfigName() (v1.Hash, error) {
    70  	return partial.ConfigName(s)
    71  }
    72  
    73  func (s *schema1) ConfigFile() (*v1.ConfigFile, error) {
    74  	return nil, newErrSchema1(s.mediaType)
    75  }
    76  
    77  func (s *schema1) RawConfigFile() ([]byte, error) {
    78  	return []byte("{}"), nil
    79  }
    80  
    81  func (s *schema1) Digest() (v1.Hash, error) {
    82  	return s.descriptor.Digest, nil
    83  }
    84  
    85  func (s *schema1) Manifest() (*v1.Manifest, error) {
    86  	return nil, newErrSchema1(s.mediaType)
    87  }
    88  
    89  func (s *schema1) RawManifest() ([]byte, error) {
    90  	return s.manifest, nil
    91  }
    92  
    93  func (s *schema1) LayerByDigest(h v1.Hash) (v1.Layer, error) {
    94  	l, err := partial.CompressedToLayer(&remoteLayer{
    95  		fetcher: s.fetcher,
    96  		ctx:     s.ctx,
    97  		digest:  h,
    98  	})
    99  	if err != nil {
   100  		return nil, err
   101  	}
   102  	return &MountableLayer{
   103  		Layer:     l,
   104  		Reference: s.ref.Context().Digest(h.String()),
   105  	}, nil
   106  }
   107  
   108  func (s *schema1) LayerByDiffID(v1.Hash) (v1.Layer, error) {
   109  	return nil, newErrSchema1(s.mediaType)
   110  }
   111  
   112  type fslayer struct {
   113  	BlobSum string `json:"blobSum"`
   114  }
   115  
   116  type schema1Manifest struct {
   117  	FSLayers []fslayer `json:"fsLayers"`
   118  }
   119
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