1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
// Copyright 2018 Google LLC All Rights Reserved.
//
// 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 partial
import (
"bytes"
"io"
"sync"
"github.com/google/go-containerregistry/internal/gzip"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/types"
)
// UncompressedLayer represents the bare minimum interface a natively
// uncompressed layer must implement for us to produce a v1.Layer
type UncompressedLayer interface {
// DiffID returns the Hash of the uncompressed layer.
DiffID() (v1.Hash, error)
// Uncompressed returns an io.ReadCloser for the uncompressed layer contents.
Uncompressed() (io.ReadCloser, error)
// Returns the mediaType for the compressed Layer
MediaType() (types.MediaType, error)
}
// uncompressedLayerExtender implements v1.Image using the uncompressed base properties.
type uncompressedLayerExtender struct {
UncompressedLayer
// Memoize size/hash so that the methods aren't twice as
// expensive as doing this manually.
hash v1.Hash
size int64
hashSizeError error
once sync.Once
}
// Compressed implements v1.Layer
func (ule *uncompressedLayerExtender) Compressed() (io.ReadCloser, error) {
u, err := ule.Uncompressed()
if err != nil {
return nil, err
}
return gzip.ReadCloser(u), nil
}
// Digest implements v1.Layer
func (ule *uncompressedLayerExtender) Digest() (v1.Hash, error) {
ule.calcSizeHash()
return ule.hash, ule.hashSizeError
}
// Size implements v1.Layer
func (ule *uncompressedLayerExtender) Size() (int64, error) {
ule.calcSizeHash()
return ule.size, ule.hashSizeError
}
func (ule *uncompressedLayerExtender) calcSizeHash() {
ule.once.Do(func() {
var r io.ReadCloser
r, ule.hashSizeError = ule.Compressed()
if ule.hashSizeError != nil {
return
}
defer r.Close()
ule.hash, ule.size, ule.hashSizeError = v1.SHA256(r)
})
}
// UncompressedToLayer fills in the missing methods from an UncompressedLayer so that it implements v1.Layer
func UncompressedToLayer(ul UncompressedLayer) (v1.Layer, error) {
return &uncompressedLayerExtender{UncompressedLayer: ul}, nil
}
// UncompressedImageCore represents the bare minimum interface a natively
// uncompressed image must implement for us to produce a v1.Image
type UncompressedImageCore interface {
ImageCore
// LayerByDiffID is a variation on the v1.Image method, which returns
// an UncompressedLayer instead.
LayerByDiffID(v1.Hash) (UncompressedLayer, error)
}
// UncompressedToImage fills in the missing methods from an UncompressedImageCore so that it implements v1.Image.
func UncompressedToImage(uic UncompressedImageCore) (v1.Image, error) {
return &uncompressedImageExtender{
UncompressedImageCore: uic,
}, nil
}
// uncompressedImageExtender implements v1.Image by extending UncompressedImageCore with the
// appropriate methods computed from the minimal core.
type uncompressedImageExtender struct {
UncompressedImageCore
lock sync.Mutex
manifest *v1.Manifest
}
// Assert that our extender type completes the v1.Image interface
var _ v1.Image = (*uncompressedImageExtender)(nil)
// Digest implements v1.Image
func (i *uncompressedImageExtender) Digest() (v1.Hash, error) {
return Digest(i)
}
// Manifest implements v1.Image
func (i *uncompressedImageExtender) Manifest() (*v1.Manifest, error) {
i.lock.Lock()
defer i.lock.Unlock()
if i.manifest != nil {
return i.manifest, nil
}
b, err := i.RawConfigFile()
if err != nil {
return nil, err
}
cfgHash, cfgSize, err := v1.SHA256(bytes.NewReader(b))
if err != nil {
return nil, err
}
m := &v1.Manifest{
SchemaVersion: 2,
MediaType: types.DockerManifestSchema2,
Config: v1.Descriptor{
MediaType: types.DockerConfigJSON,
Size: cfgSize,
Digest: cfgHash,
},
}
ls, err := i.Layers()
if err != nil {
return nil, err
}
m.Layers = make([]v1.Descriptor, len(ls))
for i, l := range ls {
desc, err := Descriptor(l)
if err != nil {
return nil, err
}
m.Layers[i] = *desc
}
i.manifest = m
return i.manifest, nil
}
// RawManifest implements v1.Image
func (i *uncompressedImageExtender) RawManifest() ([]byte, error) {
return RawManifest(i)
}
// Size implements v1.Image
func (i *uncompressedImageExtender) Size() (int64, error) {
return Size(i)
}
// ConfigName implements v1.Image
func (i *uncompressedImageExtender) ConfigName() (v1.Hash, error) {
return ConfigName(i)
}
// ConfigFile implements v1.Image
func (i *uncompressedImageExtender) ConfigFile() (*v1.ConfigFile, error) {
return ConfigFile(i)
}
// Layers implements v1.Image
func (i *uncompressedImageExtender) Layers() ([]v1.Layer, error) {
diffIDs, err := DiffIDs(i)
if err != nil {
return nil, err
}
ls := make([]v1.Layer, 0, len(diffIDs))
for _, h := range diffIDs {
l, err := i.LayerByDiffID(h)
if err != nil {
return nil, err
}
ls = append(ls, l)
}
return ls, nil
}
// LayerByDiffID implements v1.Image
func (i *uncompressedImageExtender) LayerByDiffID(diffID v1.Hash) (v1.Layer, error) {
ul, err := i.UncompressedImageCore.LayerByDiffID(diffID)
if err != nil {
return nil, err
}
return UncompressedToLayer(ul)
}
// LayerByDigest implements v1.Image
func (i *uncompressedImageExtender) LayerByDigest(h v1.Hash) (v1.Layer, error) {
diffID, err := BlobToDiffID(i, h)
if err != nil {
return nil, err
}
return i.LayerByDiffID(diffID)
}
|
