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
|
// Copyright 2020 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 (
"fmt"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/match"
"github.com/google/go-containerregistry/pkg/v1/types"
)
// FindManifests given a v1.ImageIndex, find the manifests that fit the matcher.
func FindManifests(index v1.ImageIndex, matcher match.Matcher) ([]v1.Descriptor, error) {
// get the actual manifest list
indexManifest, err := index.IndexManifest()
if err != nil {
return nil, fmt.Errorf("unable to get raw index: %w", err)
}
manifests := []v1.Descriptor{}
// try to get the root of our image
for _, manifest := range indexManifest.Manifests {
if matcher(manifest) {
manifests = append(manifests, manifest)
}
}
return manifests, nil
}
// FindImages given a v1.ImageIndex, find the images that fit the matcher. If a Descriptor
// matches the provider Matcher, but the referenced item is not an Image, ignores it.
// Only returns those that match the Matcher and are images.
func FindImages(index v1.ImageIndex, matcher match.Matcher) ([]v1.Image, error) {
matches := []v1.Image{}
manifests, err := FindManifests(index, matcher)
if err != nil {
return nil, err
}
for _, desc := range manifests {
// if it is not an image, ignore it
if !desc.MediaType.IsImage() {
continue
}
img, err := index.Image(desc.Digest)
if err != nil {
return nil, err
}
matches = append(matches, img)
}
return matches, nil
}
// FindIndexes given a v1.ImageIndex, find the indexes that fit the matcher. If a Descriptor
// matches the provider Matcher, but the referenced item is not an Index, ignores it.
// Only returns those that match the Matcher and are indexes.
func FindIndexes(index v1.ImageIndex, matcher match.Matcher) ([]v1.ImageIndex, error) {
matches := []v1.ImageIndex{}
manifests, err := FindManifests(index, matcher)
if err != nil {
return nil, err
}
for _, desc := range manifests {
if !desc.MediaType.IsIndex() {
continue
}
// if it is not an index, ignore it
idx, err := index.ImageIndex(desc.Digest)
if err != nil {
return nil, err
}
matches = append(matches, idx)
}
return matches, nil
}
type withManifests interface {
Manifests() ([]Describable, error)
}
type withLayer interface {
Layer(v1.Hash) (v1.Layer, error)
}
type describable struct {
desc v1.Descriptor
}
func (d describable) Digest() (v1.Hash, error) {
return d.desc.Digest, nil
}
func (d describable) Size() (int64, error) {
return d.desc.Size, nil
}
func (d describable) MediaType() (types.MediaType, error) {
return d.desc.MediaType, nil
}
func (d describable) Descriptor() (*v1.Descriptor, error) {
return &d.desc, nil
}
// Manifests is analogous to v1.Image.Layers in that it allows values in the
// returned list to be lazily evaluated, which enables an index to contain
// an image that contains a streaming layer.
//
// This should have been part of the v1.ImageIndex interface, but wasn't.
// It is instead usable through this extension interface.
func Manifests(idx v1.ImageIndex) ([]Describable, error) {
if wm, ok := idx.(withManifests); ok {
return wm.Manifests()
}
return ComputeManifests(idx)
}
// ComputeManifests provides a fallback implementation for Manifests.
func ComputeManifests(idx v1.ImageIndex) ([]Describable, error) {
m, err := idx.IndexManifest()
if err != nil {
return nil, err
}
manifests := []Describable{}
for _, desc := range m.Manifests {
switch {
case desc.MediaType.IsImage():
img, err := idx.Image(desc.Digest)
if err != nil {
return nil, err
}
manifests = append(manifests, img)
case desc.MediaType.IsIndex():
idx, err := idx.ImageIndex(desc.Digest)
if err != nil {
return nil, err
}
manifests = append(manifests, idx)
default:
if wl, ok := idx.(withLayer); ok {
layer, err := wl.Layer(desc.Digest)
if err != nil {
return nil, err
}
manifests = append(manifests, layer)
} else {
manifests = append(manifests, describable{desc})
}
}
}
return manifests, nil
}
|
