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
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
package main
import (
"fmt"
"os"
gosignal "os/signal"
"github.com/docker/docker/pkg/signal"
"github.com/docker/docker/pkg/term"
"github.com/pkg/errors"
"github.com/projectatomic/libpod/libpod"
"github.com/sirupsen/logrus"
"golang.org/x/crypto/ssh/terminal"
"k8s.io/client-go/tools/remotecommand"
)
type RawTtyFormatter struct {
}
// Attach to a container
func attachCtr(ctr *libpod.Container, stdout, stderr, stdin *os.File, detachKeys string, sigProxy bool) error {
resize := make(chan remotecommand.TerminalSize)
haveTerminal := terminal.IsTerminal(int(os.Stdin.Fd()))
// Check if we are attached to a terminal. If we are, generate resize
// events, and set the terminal to raw mode
if haveTerminal && ctr.Spec().Process.Terminal {
logrus.Debugf("Handling terminal attach")
resizeTerminate := make(chan interface{})
defer func() {
resizeTerminate <- true
close(resizeTerminate)
}()
resizeTty(resize, resizeTerminate)
oldTermState, err := term.SaveState(os.Stdin.Fd())
if err != nil {
return errors.Wrapf(err, "unable to save terminal state")
}
logrus.SetFormatter(&RawTtyFormatter{})
term.SetRawTerminal(os.Stdin.Fd())
defer restoreTerminal(oldTermState)
}
// There may be on the other size of the resize channel a goroutine trying to send.
// So consume all data inside the channel before exiting to avoid a deadlock.
defer func() {
for {
select {
case <-resize:
logrus.Debugf("Consumed resize command from channel")
default:
return
}
}
}()
streams := new(libpod.AttachStreams)
streams.OutputStream = stdout
streams.ErrorStream = stderr
streams.InputStream = stdin
streams.AttachOutput = true
streams.AttachError = true
streams.AttachInput = true
if stdout == nil {
logrus.Debugf("Not attaching to stdout")
streams.AttachOutput = false
}
if stderr == nil {
logrus.Debugf("Not attaching to stderr")
streams.AttachError = false
}
if stdin == nil {
logrus.Debugf("Not attaching to stdin")
streams.AttachInput = false
}
if sigProxy {
ProxySignals(ctr)
}
return ctr.Attach(streams, detachKeys, resize)
}
// Start and attach to a container
func startAttachCtr(ctr *libpod.Container, stdout, stderr, stdin *os.File, detachKeys string, sigProxy bool) error {
resize := make(chan remotecommand.TerminalSize)
haveTerminal := terminal.IsTerminal(int(os.Stdin.Fd()))
// Check if we are attached to a terminal. If we are, generate resize
// events, and set the terminal to raw mode
if haveTerminal && ctr.Spec().Process.Terminal {
logrus.Debugf("Handling terminal attach")
resizeTerminate := make(chan interface{})
defer func() {
resizeTerminate <- true
close(resizeTerminate)
}()
resizeTty(resize, resizeTerminate)
oldTermState, err := term.SaveState(os.Stdin.Fd())
if err != nil {
return errors.Wrapf(err, "unable to save terminal state")
}
logrus.SetFormatter(&RawTtyFormatter{})
term.SetRawTerminal(os.Stdin.Fd())
defer restoreTerminal(oldTermState)
}
// There may be on the other size of the resize channel a goroutine trying to send.
// So consume all data inside the channel before exiting to avoid a deadlock.
defer func() {
for {
select {
case <-resize:
logrus.Debugf("Consumed resize command from channel")
default:
return
}
}
}()
streams := new(libpod.AttachStreams)
streams.OutputStream = stdout
streams.ErrorStream = stderr
streams.InputStream = stdin
streams.AttachOutput = true
streams.AttachError = true
streams.AttachInput = true
if stdout == nil {
logrus.Debugf("Not attaching to stdout")
streams.AttachOutput = false
}
if stderr == nil {
logrus.Debugf("Not attaching to stderr")
streams.AttachError = false
}
if stdin == nil {
logrus.Debugf("Not attaching to stdin")
streams.AttachInput = false
}
attachChan, err := ctr.StartAndAttach(getContext(), streams, detachKeys, resize)
if err != nil {
return err
}
if sigProxy {
ProxySignals(ctr)
}
if stdout == nil && stderr == nil {
fmt.Printf("%s\n", ctr.ID())
}
err = <-attachChan
if err != nil {
return errors.Wrapf(err, "error attaching to container %s", ctr.ID())
}
return nil
}
// Helper for prepareAttach - set up a goroutine to generate terminal resize events
func resizeTty(resize chan remotecommand.TerminalSize, resizeTerminate chan interface{}) {
sigchan := make(chan os.Signal, 1)
gosignal.Notify(sigchan, signal.SIGWINCH)
sendUpdate := func() {
winsize, err := term.GetWinsize(os.Stdin.Fd())
if err != nil {
logrus.Warnf("Could not get terminal size %v", err)
return
}
resize <- remotecommand.TerminalSize{
Width: winsize.Width,
Height: winsize.Height,
}
}
go func() {
defer close(resize)
// Update the terminal size immediately without waiting
// for a SIGWINCH to get the correct initial size.
sendUpdate()
for {
select {
case <-resizeTerminate:
return
case <-sigchan:
sendUpdate()
}
}
}()
}
func restoreTerminal(state *term.State) error {
logrus.SetFormatter(&logrus.TextFormatter{})
return term.RestoreTerminal(os.Stdin.Fd(), state)
}
func (f *RawTtyFormatter) Format(entry *logrus.Entry) ([]byte, error) {
textFormatter := logrus.TextFormatter{}
bytes, err := textFormatter.Format(entry)
if err == nil {
bytes = append(bytes, '\r')
}
return bytes, err
}
|
