-
Notifications
You must be signed in to change notification settings - Fork 1
/
exec.go
205 lines (174 loc) · 5.34 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
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
package container
import (
"fmt"
"io"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/api/types"
"github.com/docker/docker/cli"
"github.com/docker/docker/cli/command"
apiclient "github.com/docker/docker/client"
options "github.com/docker/docker/opts"
"github.com/docker/docker/pkg/promise"
"github.com/spf13/cobra"
"golang.org/x/net/context"
)
type execOptions struct {
detachKeys string
interactive bool
tty bool
detach bool
user string
privileged bool
env *options.ListOpts
}
func newExecOptions() *execOptions {
var values []string
return &execOptions{
env: options.NewListOptsRef(&values, options.ValidateEnv),
}
}
// NewExecCommand creates a new cobra.Command for `docker exec`
func NewExecCommand(dockerCli *command.DockerCli) *cobra.Command {
opts := newExecOptions()
cmd := &cobra.Command{
Use: "exec [OPTIONS] CONTAINER COMMAND [ARG...]",
Short: "Run a command in a running container",
Args: cli.RequiresMinArgs(2),
RunE: func(cmd *cobra.Command, args []string) error {
container := args[0]
execCmd := args[1:]
return runExec(dockerCli, opts, container, execCmd)
},
}
flags := cmd.Flags()
flags.SetInterspersed(false)
flags.StringVarP(&opts.detachKeys, "detach-keys", "", "", "Override the key sequence for detaching a container")
flags.BoolVarP(&opts.interactive, "interactive", "i", false, "Keep STDIN open even if not attached")
flags.BoolVarP(&opts.tty, "tty", "t", false, "Allocate a pseudo-TTY")
flags.BoolVarP(&opts.detach, "detach", "d", false, "Detached mode: run command in the background")
flags.StringVarP(&opts.user, "user", "u", "", "Username or UID (format: <name|uid>[:<group|gid>])")
flags.BoolVarP(&opts.privileged, "privileged", "", false, "Give extended privileges to the command")
flags.VarP(opts.env, "env", "e", "Set environment variables")
flags.SetAnnotation("env", "version", []string{"1.25"})
return cmd
}
func runExec(dockerCli *command.DockerCli, opts *execOptions, container string, execCmd []string) error {
execConfig, err := parseExec(opts, execCmd)
// just in case the ParseExec does not exit
if container == "" || err != nil {
return cli.StatusError{StatusCode: 1}
}
if opts.detachKeys != "" {
dockerCli.ConfigFile().DetachKeys = opts.detachKeys
}
// Send client escape keys
execConfig.DetachKeys = dockerCli.ConfigFile().DetachKeys
ctx := context.Background()
client := dockerCli.Client()
response, err := client.ContainerExecCreate(ctx, container, *execConfig)
if err != nil {
return err
}
execID := response.ID
if execID == "" {
fmt.Fprintln(dockerCli.Out(), "exec ID empty")
return nil
}
//Temp struct for execStart so that we don't need to transfer all the execConfig
if !execConfig.Detach {
if err := dockerCli.In().CheckTty(execConfig.AttachStdin, execConfig.Tty); err != nil {
return err
}
} else {
execStartCheck := types.ExecStartCheck{
Detach: execConfig.Detach,
Tty: execConfig.Tty,
}
if err := client.ContainerExecStart(ctx, execID, execStartCheck); err != nil {
return err
}
// For now don't print this - wait for when we support exec wait()
// fmt.Fprintf(dockerCli.Out(), "%s\n", execID)
return nil
}
// Interactive exec requested.
var (
out, stderr io.Writer
in io.ReadCloser
errCh chan error
)
if execConfig.AttachStdin {
in = dockerCli.In()
}
if execConfig.AttachStdout {
out = dockerCli.Out()
}
if execConfig.AttachStderr {
if execConfig.Tty {
stderr = dockerCli.Out()
} else {
stderr = dockerCli.Err()
}
}
resp, err := client.ContainerExecAttach(ctx, execID, *execConfig)
if err != nil {
return err
}
defer resp.Close()
errCh = promise.Go(func() error {
return holdHijackedConnection(ctx, dockerCli, execConfig.Tty, in, out, stderr, resp)
})
if execConfig.Tty && dockerCli.In().IsTerminal() {
if err := MonitorTtySize(ctx, dockerCli, execID, true); err != nil {
fmt.Fprintln(dockerCli.Err(), "Error monitoring TTY size:", err)
}
}
if err := <-errCh; err != nil {
logrus.Debugf("Error hijack: %s", err)
return err
}
var status int
if _, status, err = getExecExitCode(ctx, client, execID); err != nil {
return err
}
if status != 0 {
return cli.StatusError{StatusCode: status}
}
return nil
}
// getExecExitCode perform an inspect on the exec command. It returns
// the running state and the exit code.
func getExecExitCode(ctx context.Context, client apiclient.ContainerAPIClient, execID string) (bool, int, error) {
resp, err := client.ContainerExecInspect(ctx, execID)
if err != nil {
// If we can't connect, then the daemon probably died.
if !apiclient.IsErrConnectionFailed(err) {
return false, -1, err
}
return false, -1, nil
}
return resp.Running, resp.ExitCode, nil
}
// parseExec parses the specified args for the specified command and generates
// an ExecConfig from it.
func parseExec(opts *execOptions, execCmd []string) (*types.ExecConfig, error) {
execConfig := &types.ExecConfig{
User: opts.user,
Privileged: opts.privileged,
Tty: opts.tty,
Cmd: execCmd,
Detach: opts.detach,
}
// If -d is not set, attach to everything by default
if !opts.detach {
execConfig.AttachStdout = true
execConfig.AttachStderr = true
if opts.interactive {
execConfig.AttachStdin = true
}
}
if opts.env != nil {
execConfig.Env = opts.env.GetAll()
}
return execConfig, nil
}