summaryrefslogtreecommitdiff
path: root/cmd/podman/utils.go
blob: 227426c18f6713888a6964738db423f561ad58e3 (plain)
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
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)

	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")
		}

		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)

	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")
		}

		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, 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()
			}
		}
	}()
}