summaryrefslogtreecommitdiff
path: root/cmd/podman/utils.go
blob: 4ec0f8a1358aef165db5b97c8674e279995b11a7 (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
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
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
package main

import (
	"context"
	"fmt"
	"github.com/spf13/pflag"
	"os"
	gosignal "os/signal"

	"github.com/containers/libpod/cmd/podman/cliconfig"
	"github.com/containers/libpod/libpod"
	"github.com/docker/docker/pkg/signal"
	"github.com/docker/docker/pkg/term"
	"github.com/pkg/errors"
	"github.com/sirupsen/logrus"
	"golang.org/x/crypto/ssh/terminal"
	"k8s.io/client-go/tools/remotecommand"
)

type RawTtyFormatter struct {
}

// Start (if required) and attach to a container
func startAttachCtr(ctr *libpod.Container, stdout, stderr, stdin *os.File, detachKeys string, sigProxy bool, startContainer bool, recursive bool) error {
	ctx := context.Background()
	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")

		subCtx, cancel := context.WithCancel(ctx)
		defer cancel()

		resizeTty(subCtx, resize)

		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)
	}

	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 !startContainer {
		if sigProxy {
			ProxySignals(ctr)
		}

		return ctr.Attach(streams, detachKeys, resize)
	}

	attachChan, err := ctr.StartAndAttach(getContext(), streams, detachKeys, resize, recursive)
	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
}

// getResize returns a TerminalSize command matching stdin's current
// size on success, and nil on errors.
func getResize() *remotecommand.TerminalSize {
	winsize, err := term.GetWinsize(os.Stdin.Fd())
	if err != nil {
		logrus.Warnf("Could not get terminal size %v", err)
		return nil
	}
	return &remotecommand.TerminalSize{
		Width:  winsize.Width,
		Height: winsize.Height,
	}
}

// Helper for prepareAttach - set up a goroutine to generate terminal resize events
func resizeTty(ctx context.Context, resize chan remotecommand.TerminalSize) {
	sigchan := make(chan os.Signal, 1)
	gosignal.Notify(sigchan, signal.SIGWINCH)
	go func() {
		defer close(resize)
		// Update the terminal size immediately without waiting
		// for a SIGWINCH to get the correct initial size.
		resizeEvent := getResize()
		for {
			if resizeEvent == nil {
				select {
				case <-ctx.Done():
					return
				case <-sigchan:
					resizeEvent = getResize()
				}
			} else {
				select {
				case <-ctx.Done():
					return
				case <-sigchan:
					resizeEvent = getResize()
				case resize <- *resizeEvent:
					resizeEvent = nil
				}
			}
		}
	}()
}

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
}

// For pod commands that have a latest and all flag, getPodsFromContext gets
// pods the user specifies. If there's an error before getting pods, the pods slice
// will be empty and error will be not nil. If an error occured after, the pod slice
// will hold all of the successful pods, and error will hold the last error.
// The remaining errors will be logged. On success, pods will hold all pods and
// error will be nil.
func getPodsFromContext(c *cliconfig.PodmanCommand, r *libpod.Runtime) ([]*libpod.Pod, error) {
	args := c.InputArgs
	var pods []*libpod.Pod
	var lastError error
	var err error

	if c.Bool("all") {
		pods, err = r.GetAllPods()
		if err != nil {
			return nil, errors.Wrapf(err, "unable to get running pods")
		}
	}

	if c.Bool("latest") {
		pod, err := r.GetLatestPod()
		if err != nil {
			return nil, errors.Wrapf(err, "unable to get latest pod")
		}
		pods = append(pods, pod)
	}

	for _, i := range args {
		pod, err := r.LookupPod(i)
		if err != nil {
			if lastError != nil {
				logrus.Errorf("%q", lastError)
			}
			lastError = errors.Wrapf(err, "unable to find pod %s", i)
			continue
		}
		pods = append(pods, pod)
	}
	return pods, lastError
}

func getVolumesFromContext(c *cliconfig.PodmanCommand, r *libpod.Runtime) ([]*libpod.Volume, error) {
	args := c.InputArgs
	var (
		vols      []*libpod.Volume
		lastError error
		err       error
	)

	if c.Bool("all") {
		vols, err = r.Volumes()
		if err != nil {
			return nil, errors.Wrapf(err, "unable to get all volumes")
		}
	}

	for _, i := range args {
		vol, err := r.GetVolume(i)
		if err != nil {
			if lastError != nil {
				logrus.Errorf("%q", lastError)
			}
			lastError = errors.Wrapf(err, "unable to find volume %s", i)
			continue
		}
		vols = append(vols, vol)
	}
	return vols, lastError
}

//printParallelOutput takes the map of parallel worker results and outputs them
// to stdout
func printParallelOutput(m map[string]error, errCount int) error {
	var lastError error
	for cid, result := range m {
		if result != nil {
			if errCount > 1 {
				fmt.Println(result.Error())
			}
			lastError = result
			continue
		}
		fmt.Println(cid)
	}
	return lastError
}

// markFlagHiddenForRemoteClient makes the flag not appear as part of the CLI
// on the remote-client
func markFlagHiddenForRemoteClient(flagName string, flags *pflag.FlagSet) {
	if remoteclient {
		flags.MarkHidden(flagName)
	}
}