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
|
/*
Copyright The containerd Authors.
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 commands
import (
"context"
"fmt"
"github.com/containerd/containerd"
"github.com/containerd/containerd/cmd/ctr/commands"
"github.com/containerd/containerd/cmd/ctr/commands/content"
"github.com/containerd/containerd/images"
"github.com/containerd/containerd/log"
ctdsnapshotters "github.com/containerd/containerd/pkg/snapshotters"
"github.com/containerd/containerd/snapshots"
fsconfig "github.com/containerd/stargz-snapshotter/fs/config"
"github.com/containerd/stargz-snapshotter/fs/source"
ocispec "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/urfave/cli"
)
const (
remoteSnapshotterName = "stargz"
skipContentVerifyOpt = "skip-content-verify"
)
// RpullCommand is a subcommand to pull an image from a registry levaraging stargz snapshotter
var RpullCommand = cli.Command{
Name: "rpull",
Usage: "pull an image from a registry levaraging stargz snapshotter",
ArgsUsage: "[flags] <ref>",
Description: `Fetch and prepare an image for use in containerd levaraging stargz snapshotter.
After pulling an image, it should be ready to use the same reference in a run
command.
`,
Flags: append(append(commands.RegistryFlags, commands.LabelFlag,
cli.BoolFlag{
Name: skipContentVerifyOpt,
Usage: "Skip content verification for layers contained in this image.",
},
cli.BoolFlag{
Name: "use-containerd-labels",
Usage: "Use labels defined in containerd project",
},
), commands.SnapshotterFlags...),
Action: func(context *cli.Context) error {
var (
ref = context.Args().First()
config = &rPullConfig{}
)
if ref == "" {
return fmt.Errorf("please provide an image reference to pull")
}
client, ctx, cancel, err := commands.NewClient(context)
if err != nil {
return err
}
defer cancel()
ctx, done, err := client.WithLease(ctx)
if err != nil {
return err
}
defer done(ctx)
fc, err := content.NewFetchConfig(ctx, context)
if err != nil {
return err
}
config.FetchConfig = fc
config.containerdLabels = context.Bool("use-containerd-labels")
if context.Bool(skipContentVerifyOpt) {
config.skipVerify = true
}
config.snapshotter = remoteSnapshotterName
if sn := context.String("snapshotter"); sn != "" {
config.snapshotter = sn
}
return pull(ctx, client, ref, config)
},
}
type rPullConfig struct {
*content.FetchConfig
skipVerify bool
snapshotter string
containerdLabels bool
}
func pull(ctx context.Context, client *containerd.Client, ref string, config *rPullConfig) error {
pCtx := ctx
h := images.HandlerFunc(func(ctx context.Context, desc ocispec.Descriptor) ([]ocispec.Descriptor, error) {
if desc.MediaType != images.MediaTypeDockerSchema1Manifest {
fmt.Printf("fetching %v... %v\n", desc.Digest.String()[:15], desc.MediaType)
}
return nil, nil
})
var snOpts []snapshots.Opt
if config.skipVerify {
log.G(pCtx).WithField("image", ref).Warn("content verification disabled")
snOpts = append(snOpts, snapshots.WithLabels(map[string]string{
fsconfig.TargetSkipVerifyLabel: "true",
}))
}
var labelHandler func(h images.Handler) images.Handler
prefetchSize := int64(10*1024*1024)
if config.containerdLabels {
labelHandler = source.AppendExtraLabelsHandler(prefetchSize, ctdsnapshotters.AppendInfoHandlerWrapper(ref))
} else {
labelHandler = source.AppendDefaultLabelsHandlerWrapper(ref, prefetchSize)
}
log.G(pCtx).WithField("image", ref).Debug("fetching")
labels := commands.LabelArgs(config.Labels)
if _, err := client.Pull(pCtx, ref, []containerd.RemoteOpt{
containerd.WithPullLabels(labels),
containerd.WithResolver(config.Resolver),
containerd.WithImageHandler(h),
containerd.WithSchema1Conversion,
containerd.WithPullUnpack,
containerd.WithPullSnapshotter(config.snapshotter, snOpts...),
containerd.WithImageHandlerWrapper(labelHandler),
}...); err != nil {
return err
}
return nil
}
|
