forked from containerd/containerd
-
Notifications
You must be signed in to change notification settings - Fork 0
/
container_unix.go
116 lines (110 loc) · 2.97 KB
/
container_unix.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
// +build !windows
package containerd
import (
"context"
"encoding/json"
"fmt"
"io/ioutil"
"github.com/containerd/containerd/api/services/containers/v1"
"github.com/containerd/containerd/api/services/tasks/v1"
"github.com/containerd/containerd/api/types"
"github.com/containerd/containerd/content"
"github.com/containerd/containerd/errdefs"
"github.com/containerd/containerd/images"
"github.com/gogo/protobuf/proto"
protobuf "github.com/gogo/protobuf/types"
digest "github.com/opencontainers/go-digest"
"github.com/opencontainers/image-spec/identity"
"github.com/opencontainers/image-spec/specs-go/v1"
)
func WithCheckpoint(desc v1.Descriptor, rootfsID string) NewContainerOpts {
// set image and rw, and spec
return func(ctx context.Context, client *Client, c *containers.Container) error {
id := desc.Digest
store := client.ContentStore()
index, err := decodeIndex(ctx, store, id)
if err != nil {
return err
}
var rw *v1.Descriptor
for _, m := range index.Manifests {
switch m.MediaType {
case v1.MediaTypeImageLayer:
fk := m
rw = &fk
case images.MediaTypeDockerSchema2Manifest:
config, err := images.Config(ctx, store, m)
if err != nil {
return err
}
diffIDs, err := images.RootFS(ctx, store, config)
if err != nil {
return err
}
if _, err := client.SnapshotService().Prepare(ctx, rootfsID, identity.ChainID(diffIDs).String()); err != nil {
if !errdefs.IsAlreadyExists(err) {
return err
}
}
c.Image = index.Annotations["image.name"]
case images.MediaTypeContainerd1CheckpointConfig:
r, err := store.Reader(ctx, m.Digest)
if err != nil {
return err
}
data, err := ioutil.ReadAll(r)
r.Close()
if err != nil {
return err
}
var any protobuf.Any
if err := proto.Unmarshal(data, &any); err != nil {
return err
}
c.Spec = &any
}
}
if rw != nil {
// apply the rw snapshot to the new rw layer
mounts, err := client.SnapshotService().Mounts(ctx, rootfsID)
if err != nil {
return err
}
if _, err := client.DiffService().Apply(ctx, *rw, mounts); err != nil {
return err
}
}
c.RootFS = rootfsID
return nil
}
}
func WithTaskCheckpoint(desc v1.Descriptor) NewTaskOpts {
return func(ctx context.Context, c *Client, r *tasks.CreateTaskRequest) error {
id := desc.Digest
index, err := decodeIndex(ctx, c.ContentStore(), id)
if err != nil {
return err
}
for _, m := range index.Manifests {
if m.MediaType == images.MediaTypeContainerd1Checkpoint {
r.Checkpoint = &types.Descriptor{
MediaType: m.MediaType,
Size_: m.Size,
Digest: m.Digest,
}
return nil
}
}
return fmt.Errorf("checkpoint not found in index %s", id)
}
}
func decodeIndex(ctx context.Context, store content.Store, id digest.Digest) (*v1.Index, error) {
var index v1.Index
r, err := store.Reader(ctx, id)
if err != nil {
return nil, err
}
err = json.NewDecoder(r).Decode(&index)
r.Close()
return &index, err
}