-
Notifications
You must be signed in to change notification settings - Fork 239
/
registry.go
141 lines (114 loc) · 3.4 KB
/
registry.go
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
package containerdregistry
import (
"archive/tar"
"context"
"io"
"os"
"github.com/containerd/containerd/archive"
"github.com/containerd/containerd/archive/compression"
"github.com/containerd/containerd/errdefs"
"github.com/containerd/containerd/images"
"github.com/containerd/containerd/namespaces"
"github.com/containerd/containerd/platforms"
"github.com/containerd/containerd/remotes"
ocispec "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/sirupsen/logrus"
"github.com/operator-framework/operator-registry/pkg/image"
)
// Registry enables manipulation of images via containerd modules.
type Registry struct {
Store
log *logrus.Entry
resolver remotes.Resolver
platform platforms.MatchComparer
}
var _ image.Registry = &Registry{}
// Pull fetches and stores an image by reference.
func (r *Registry) Pull(ctx context.Context, ref image.Reference) error {
// Set the default namespace if unset
ctx = ensureNamespace(ctx)
name, root, err := r.resolver.Resolve(ctx, ref.String())
if err != nil {
return err
}
r.log.Infof("resolved name: %s", name)
fetcher, err := r.resolver.Fetcher(ctx, name)
if err != nil {
return err
}
if err := r.fetch(ctx, fetcher, root); err != nil {
return err
}
img := images.Image{
Name: ref.String(),
Target: root,
}
if _, err = r.Images().Create(ctx, img); err != nil {
if errdefs.IsAlreadyExists(err) {
_, err = r.Images().Update(ctx, img)
}
}
return err
}
// Unpack writes the unpackaged content of an image to a directory.
// If the referenced image does not exist in the registry, an error is returned.
func (r *Registry) Unpack(ctx context.Context, ref image.Reference, dir string) error {
// Set the default namespace if unset
ctx = ensureNamespace(ctx)
img, err := r.Images().Get(ctx, ref.String())
if err != nil {
return err
}
manifest, err := images.Manifest(ctx, r.Content(), img.Target, r.platform)
if err != nil {
return err
}
if err := os.MkdirAll(dir, os.ModePerm); err != nil {
return err
}
for _, layer := range manifest.Layers {
r.log.Infof("unpacking layer: %v", layer)
if err := r.unpackLayer(ctx, layer, dir); err != nil {
return err
}
}
return nil
}
func (r *Registry) fetch(ctx context.Context, fetcher remotes.Fetcher, root ocispec.Descriptor) error {
visitor := images.HandlerFunc(func(ctx context.Context, desc ocispec.Descriptor) ([]ocispec.Descriptor, error) {
r.log.WithField("digest", desc.Digest).Info("fetched")
r.log.Debug(desc)
return nil, nil
})
handler := images.Handlers(
visitor,
remotes.FetchHandler(r.Content(), fetcher),
images.ChildrenHandler(r.Content()),
)
return images.Dispatch(ctx, handler, nil, root)
}
func (r *Registry) unpackLayer(ctx context.Context, layer ocispec.Descriptor, dir string) error {
ra, err := r.Content().ReaderAt(ctx, layer)
if err != nil {
return err
}
defer ra.Close()
// TODO(njhale): Chunk layer reading
decompressed, err := compression.DecompressStream(io.NewSectionReader(ra, 0, ra.Size()))
if err != nil {
return err
}
_, err = archive.Apply(ctx, dir, decompressed, archive.WithFilter(adjustPerms))
return err
}
func ensureNamespace(ctx context.Context) context.Context {
if _, namespaced := namespaces.Namespace(ctx); !namespaced {
return namespaces.WithNamespace(ctx, namespaces.Default)
}
return ctx
}
func adjustPerms(h *tar.Header) (bool, error) {
h.Uid = os.Getuid()
h.Gid = os.Getgid()
return true, nil
}