forked from k3s-io/cri-tools
/
exec.go
187 lines (168 loc) · 4.7 KB
/
exec.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
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
/*
Copyright 2017 The Kubernetes 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 main
import (
"fmt"
"net/url"
dockerterm "github.com/docker/docker/pkg/term"
"github.com/sirupsen/logrus"
"github.com/urfave/cli"
"golang.org/x/net/context"
restclient "k8s.io/client-go/rest"
remoteclient "k8s.io/client-go/tools/remotecommand"
pb "k8s.io/cri-api/pkg/apis/runtime/v1alpha2"
"k8s.io/kubernetes/pkg/kubectl/util/term"
)
const (
// TODO: make this configurable in kubelet.
kubeletURLSchema = "http"
kubeletURLHost = "http://127.0.0.1:10250"
)
var runtimeExecCommand = cli.Command{
Name: "exec",
Usage: "Run a command in a running container",
ArgsUsage: "CONTAINER-ID COMMAND [ARG...]",
SkipArgReorder: true,
UseShortOptionHandling: true,
Flags: []cli.Flag{
cli.BoolFlag{
Name: "sync, s",
Usage: "Run the command synchronously",
},
cli.Int64Flag{
Name: "timeout",
Value: 0,
Usage: "Timeout in seconds",
},
cli.BoolFlag{
Name: "tty, t",
Usage: "Allocate a pseudo-TTY",
},
cli.BoolFlag{
Name: "interactive, i",
Usage: "Keep STDIN open",
},
},
Action: func(context *cli.Context) error {
if len(context.Args()) < 2 {
return cli.ShowSubcommandHelp(context)
}
if err := getRuntimeClient(context); err != nil {
return err
}
var opts = execOptions{
id: context.Args().First(),
timeout: context.Int64("timeout"),
tty: context.Bool("tty"),
stdin: context.Bool("interactive"),
cmd: context.Args()[1:],
}
if context.Bool("sync") {
exitCode, err := ExecSync(runtimeClient, opts)
if err != nil {
return fmt.Errorf("execing command in container synchronously failed: %v", err)
}
if exitCode != 0 {
return cli.NewExitError("non-zero exit code", exitCode)
}
return nil
}
err := Exec(runtimeClient, opts)
if err != nil {
return fmt.Errorf("execing command in container failed: %v", err)
}
return nil
},
After: closeConnection,
}
// ExecSync sends an ExecSyncRequest to the server, and parses
// the returned ExecSyncResponse. The function returns the corresponding exit
// code beside an general error.
func ExecSync(client pb.RuntimeServiceClient, opts execOptions) (int, error) {
request := &pb.ExecSyncRequest{
ContainerId: opts.id,
Cmd: opts.cmd,
Timeout: opts.timeout,
}
logrus.Debugf("ExecSyncRequest: %v", request)
r, err := client.ExecSync(context.Background(), request)
logrus.Debugf("ExecSyncResponse: %v", r)
if err != nil {
return 1, err
}
fmt.Println(string(r.Stdout))
fmt.Println(string(r.Stderr))
return int(r.ExitCode), nil
}
// Exec sends an ExecRequest to server, and parses the returned ExecResponse
func Exec(client pb.RuntimeServiceClient, opts execOptions) error {
request := &pb.ExecRequest{
ContainerId: opts.id,
Cmd: opts.cmd,
Tty: opts.tty,
Stdin: opts.stdin,
Stdout: true,
Stderr: !opts.tty,
}
logrus.Debugf("ExecRequest: %v", request)
r, err := client.Exec(context.Background(), request)
logrus.Debugf("ExecResponse: %v", r)
if err != nil {
return err
}
execURL := r.Url
URL, err := url.Parse(execURL)
if err != nil {
return err
}
if URL.Host == "" {
URL.Host = kubeletURLHost
}
if URL.Scheme == "" {
URL.Scheme = kubeletURLSchema
}
logrus.Debugf("Exec URL: %v", URL)
return stream(opts.stdin, opts.tty, URL)
}
func stream(in, tty bool, url *url.URL) error {
executor, err := remoteclient.NewSPDYExecutor(&restclient.Config{TLSClientConfig: restclient.TLSClientConfig{Insecure: true}}, "POST", url)
if err != nil {
return err
}
stdin, stdout, stderr := dockerterm.StdStreams()
streamOptions := remoteclient.StreamOptions{
Stdout: stdout,
Stderr: stderr,
Tty: tty,
}
if in {
streamOptions.Stdin = stdin
}
logrus.Debugf("StreamOptions: %v", streamOptions)
if !tty {
return executor.Stream(streamOptions)
}
if !in {
return fmt.Errorf("tty=true must be specified with interactive=true")
}
t := term.TTY{
In: stdin,
Out: stdout,
Raw: true,
}
if !t.IsTerminalIn() {
return fmt.Errorf("input is not a terminal")
}
streamOptions.TerminalSizeQueue = t.MonitorSize(t.GetSize())
return t.Safe(func() error { return executor.Stream(streamOptions) })
}