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
|
// 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 random
import (
"bytes"
"encoding/json"
"fmt"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/partial"
"github.com/google/go-containerregistry/pkg/v1/types"
)
type randomIndex struct {
images map[v1.Hash]v1.Image
manifest *v1.IndexManifest
}
// Index returns a pseudo-randomly generated ImageIndex with count images, each
// having the given number of layers of size byteSize.
func Index(byteSize, layers, count int64) (v1.ImageIndex, error) {
manifest := v1.IndexManifest{
SchemaVersion: 2,
MediaType: types.OCIImageIndex,
Manifests: []v1.Descriptor{},
}
images := make(map[v1.Hash]v1.Image)
for i := int64(0); i < count; i++ {
img, err := Image(byteSize, layers)
if err != nil {
return nil, err
}
rawManifest, err := img.RawManifest()
if err != nil {
return nil, err
}
digest, size, err := v1.SHA256(bytes.NewReader(rawManifest))
if err != nil {
return nil, err
}
mediaType, err := img.MediaType()
if err != nil {
return nil, err
}
manifest.Manifests = append(manifest.Manifests, v1.Descriptor{
Digest: digest,
Size: size,
MediaType: mediaType,
})
images[digest] = img
}
return &randomIndex{
images: images,
manifest: &manifest,
}, nil
}
func (i *randomIndex) MediaType() (types.MediaType, error) {
return i.manifest.MediaType, nil
}
func (i *randomIndex) Digest() (v1.Hash, error) {
return partial.Digest(i)
}
func (i *randomIndex) Size() (int64, error) {
return partial.Size(i)
}
func (i *randomIndex) IndexManifest() (*v1.IndexManifest, error) {
return i.manifest, nil
}
func (i *randomIndex) RawManifest() ([]byte, error) {
m, err := i.IndexManifest()
if err != nil {
return nil, err
}
return json.Marshal(m)
}
func (i *randomIndex) Image(h v1.Hash) (v1.Image, error) {
if img, ok := i.images[h]; ok {
return img, nil
}
return nil, fmt.Errorf("image not found: %v", h)
}
func (i *randomIndex) ImageIndex(h v1.Hash) (v1.ImageIndex, error) {
// This is a single level index (for now?).
return nil, fmt.Errorf("image not found: %v", h)
}
|
