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
|
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"
)
// Attach to a container
func attachCtr(ctr *libpod.Container, stdout, stderr, stdin *os.File, detachKeys string, sigProxy bool) error {
resize := make(chan remotecommand.TerminalSize)
defer close(resize)
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")
resizeTty(resize)
oldTermState, err := term.SaveState(os.Stdin.Fd())
if err != nil {
return errors.Wrapf(err, "unable to save terminal state")
}
term.SetRawTerminal(os.Stdin.Fd())
defer term.RestoreTerminal(os.Stdin.Fd(), oldTermState)
}
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)
defer close(resize)
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")
resizeTty(resize)
oldTermState, err := term.SaveState(os.Stdin.Fd())
if err != nil {
return errors.Wrapf(err, "unable to save terminal state")
}
term.SetRawTerminal(os.Stdin.Fd())
defer term.RestoreTerminal(os.Stdin.Fd(), oldTermState)
}
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) {
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 range sigchan {
sendUpdate()
}
}()
}
|
