-
Notifications
You must be signed in to change notification settings - Fork 24
/
utils.go
190 lines (166 loc) · 4.3 KB
/
utils.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
package client
import (
"fmt"
"io"
"io/ioutil"
"os"
gosignal "os/signal"
"path/filepath"
"runtime"
"strings"
"time"
"golang.org/x/net/context"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/pkg/signal"
"github.com/docker/docker/pkg/term"
"github.com/docker/engine-api/client"
"github.com/docker/engine-api/types"
)
func (cli *DockerCli) resizeTty(ctx context.Context, id string, isExec bool) {
height, width := cli.GetTtySize()
cli.ResizeTtyTo(ctx, id, height, width, isExec)
}
// ResizeTtyTo resizes tty to specific height and width
// TODO: this can be unexported again once all container related commands move to package container
func (cli *DockerCli) ResizeTtyTo(ctx context.Context, id string, height, width int, isExec bool) {
if height == 0 && width == 0 {
return
}
options := types.ResizeOptions{
Height: height,
Width: width,
}
var err error
if isExec {
err = cli.client.ContainerExecResize(ctx, id, options)
} else {
err = cli.client.ContainerResize(ctx, id, options)
}
if err != nil {
logrus.Debugf("Error resize: %s", err)
}
}
// getExecExitCode perform an inspect on the exec command. It returns
// the running state and the exit code.
func (cli *DockerCli) getExecExitCode(ctx context.Context, execID string) (bool, int, error) {
resp, err := cli.client.ContainerExecInspect(ctx, execID)
if err != nil {
// If we can't connect, then the daemon probably died.
if err != client.ErrConnectionFailed {
return false, -1, err
}
return false, -1, nil
}
return resp.Running, resp.ExitCode, nil
}
// MonitorTtySize updates the container tty size when the terminal tty changes size
func (cli *DockerCli) MonitorTtySize(ctx context.Context, id string, isExec bool) error {
cli.resizeTty(ctx, id, isExec)
if runtime.GOOS == "windows" {
go func() {
prevH, prevW := cli.GetTtySize()
for {
time.Sleep(time.Millisecond * 250)
h, w := cli.GetTtySize()
if prevW != w || prevH != h {
cli.resizeTty(ctx, id, isExec)
}
prevH = h
prevW = w
}
}()
} else {
sigchan := make(chan os.Signal, 1)
gosignal.Notify(sigchan, signal.SIGWINCH)
go func() {
for range sigchan {
cli.resizeTty(ctx, id, isExec)
}
}()
}
return nil
}
// GetTtySize returns the height and width in characters of the tty
func (cli *DockerCli) GetTtySize() (int, int) {
if !cli.isTerminalOut {
return 0, 0
}
ws, err := term.GetWinsize(cli.outFd)
if err != nil {
logrus.Debugf("Error getting size: %s", err)
if ws == nil {
return 0, 0
}
}
return int(ws.Height), int(ws.Width)
}
// CopyToFile writes the content of the reader to the specified file
func CopyToFile(outfile string, r io.Reader) error {
tmpFile, err := ioutil.TempFile(filepath.Dir(outfile), ".docker_temp_")
if err != nil {
return err
}
tmpPath := tmpFile.Name()
_, err = io.Copy(tmpFile, r)
tmpFile.Close()
if err != nil {
os.Remove(tmpPath)
return err
}
if err = os.Rename(tmpPath, outfile); err != nil {
os.Remove(tmpPath)
return err
}
return nil
}
// ForwardAllSignals forwards signals to the container
// TODO: this can be unexported again once all container commands are under
// api/client/container
func (cli *DockerCli) ForwardAllSignals(ctx context.Context, cid string) chan os.Signal {
sigc := make(chan os.Signal, 128)
signal.CatchAll(sigc)
go func() {
for s := range sigc {
if s == signal.SIGCHLD || s == signal.SIGPIPE {
continue
}
var sig string
for sigStr, sigN := range signal.SignalMap {
if sigN == s {
sig = sigStr
break
}
}
if sig == "" {
fmt.Fprintf(cli.err, "Unsupported signal: %v. Discarding.\n", s)
continue
}
if err := cli.client.ContainerKill(ctx, cid, sig); err != nil {
logrus.Debugf("Error sending signal: %s", err)
}
}
}()
return sigc
}
// capitalizeFirst capitalizes the first character of string
func capitalizeFirst(s string) string {
switch l := len(s); l {
case 0:
return s
case 1:
return strings.ToLower(s)
default:
return strings.ToUpper(string(s[0])) + strings.ToLower(s[1:])
}
}
// PrettyPrint outputs arbitrary data for human formatted output by uppercasing the first letter.
func PrettyPrint(i interface{}) string {
switch t := i.(type) {
case nil:
return "None"
case string:
return capitalizeFirst(t)
default:
return capitalizeFirst(fmt.Sprintf("%s", t))
}
}