aboutsummaryrefslogtreecommitdiff
path: root/cmd/podman/runlabel.go
blob: aa7411a5f9e4ec7d45eab08933d05d96f9cbea42 (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
package main

import (
	"fmt"
	"io"
	"os"
	"strings"

	"github.com/containers/image/types"
	"github.com/containers/libpod/cmd/podman/libpodruntime"
	"github.com/containers/libpod/cmd/podman/shared"
	"github.com/containers/libpod/libpod/image"
	"github.com/containers/libpod/pkg/util"
	"github.com/containers/libpod/utils"
	"github.com/pkg/errors"
	"github.com/sirupsen/logrus"
	"github.com/urfave/cli"
)

var (
	runlabelFlags = []cli.Flag{
		cli.StringFlag{
			Name:  "authfile",
			Usage: "Path of the authentication file. Default is ${XDG_RUNTIME_DIR}/containers/auth.json. Use REGISTRY_AUTH_FILE environment variable to override. ",
		},
		cli.BoolFlag{
			Name:  "display",
			Usage: "preview the command that the label would run",
		},
		cli.StringFlag{
			Name:  "cert-dir",
			Usage: "`pathname` of a directory containing TLS certificates and keys",
		},
		cli.StringFlag{
			Name:  "creds",
			Usage: "`credentials` (USERNAME:PASSWORD) to use for authenticating to a registry",
		},
		cli.StringFlag{
			Name:  "name",
			Usage: "Assign a name to the container",
		},
		cli.StringFlag{
			Name:   "opt1",
			Usage:  "Optional parameter to pass for install",
			Hidden: true,
		},
		cli.StringFlag{
			Name:   "opt2",
			Usage:  "Optional parameter to pass for install",
			Hidden: true,
		},
		cli.StringFlag{
			Name:   "opt3",
			Usage:  "Optional parameter to pass for install",
			Hidden: true,
		},
		cli.BoolFlag{
			Name:  "quiet, q",
			Usage: "Suppress output information when installing images",
		},
		cli.BoolFlag{
			Name:  "pull, p",
			Usage: "pull the image if it does not exist locally prior to executing the label contents",
		},
		cli.StringFlag{
			Name:  "signature-policy",
			Usage: "`pathname` of signature policy file (not usually used)",
		},
		cli.BoolTFlag{
			Name:  "tls-verify",
			Usage: "require HTTPS and verify certificates when contacting registries (default: true)",
		},
	}

	runlabelDescription = `
Executes a command as described by a container image label.
`
	runlabelCommand = cli.Command{
		Name:           "runlabel",
		Usage:          "Execute the command described by an image label",
		Description:    runlabelDescription,
		Flags:          sortFlags(runlabelFlags),
		Action:         runlabelCmd,
		ArgsUsage:      "",
		SkipArgReorder: true,
		OnUsageError:   usageErrorHandler,
	}
)

// installCmd gets the data from the command line and calls installImage
// to copy an image from a registry to a local machine
func runlabelCmd(c *cli.Context) error {
	var (
		imageName      string
		stdErr, stdOut io.Writer
		stdIn          io.Reader
		newImage       *image.Image
	)

	// Evil images could trick into recursively executing the runlabel
	// command.  Avoid this by setting the "PODMAN_RUNLABEL_NESTED" env
	// variable when executing a label first.
	nested := os.Getenv("PODMAN_RUNLABEL_NESTED")
	if nested == "1" {
		return fmt.Errorf("nested runlabel calls: runlabels cannot execute the runlabel command")
	}

	opts := make(map[string]string)
	runtime, err := libpodruntime.GetRuntime(c)
	if err != nil {
		return errors.Wrapf(err, "could not get runtime")
	}
	defer runtime.Shutdown(false)

	args := c.Args()
	if len(args) < 2 {
		logrus.Errorf("the runlabel command requires at least 2 arguments: LABEL IMAGE")
		return nil
	}
	if err := validateFlags(c, runlabelFlags); err != nil {
		return err
	}
	if c.Bool("display") && c.Bool("quiet") {
		return errors.Errorf("the display and quiet flags cannot be used together.")
	}

	pull := c.Bool("pull")
	label := args[0]

	runlabelImage := args[1]

	if c.IsSet("opt1") {
		opts["opt1"] = c.String("opt1")
	}
	if c.IsSet("opt2") {
		opts["opt2"] = c.String("opt2")
	}
	if c.IsSet("opt3") {
		opts["opt3"] = c.String("opt3")
	}

	ctx := getContext()

	stdErr = os.Stderr
	stdOut = os.Stdout
	stdIn = os.Stdin

	if c.Bool("quiet") {
		stdErr = nil
		stdOut = nil
		stdIn = nil
	}

	if pull {
		var registryCreds *types.DockerAuthConfig
		if c.IsSet("creds") {
			creds, err := util.ParseRegistryCreds(c.String("creds"))
			if err != nil {
				return err
			}
			registryCreds = creds
		}
		dockerRegistryOptions := image.DockerRegistryOptions{
			DockerRegistryCreds:         registryCreds,
			DockerCertPath:              c.String("cert-dir"),
			DockerInsecureSkipTLSVerify: !c.BoolT("tls-verify"),
		}
		authfile := getAuthFile(c.String("authfile"))

		newImage, err = runtime.ImageRuntime().New(ctx, runlabelImage, c.String("signature-policy"), authfile, stdOut, &dockerRegistryOptions, image.SigningOptions{}, false, false)
	} else {
		newImage, err = runtime.ImageRuntime().NewFromLocal(runlabelImage)
	}
	if err != nil {
		return errors.Wrapf(err, "unable to find image")
	}

	if len(newImage.Names()) < 1 {
		imageName = newImage.ID()
	} else {
		imageName = newImage.Names()[0]
	}

	runLabel, err := newImage.GetLabel(ctx, label)
	if err != nil {
		return err
	}

	// If no label to execute, we return
	if runLabel == "" {
		return nil
	}

	// The user provided extra arguments that need to be tacked onto the label's command
	if len(args) > 2 {
		runLabel = fmt.Sprintf("%s %s", runLabel, strings.Join(args[2:], " "))
	}

	cmd := shared.GenerateCommand(runLabel, imageName, c.String("name"))
	env := shared.GenerateRunEnvironment(c.String("name"), imageName, opts)
	env = append(env, "PODMAN_RUNLABEL_NESTED=1")

	envmap := envSliceToMap(env)

	envmapper := func(k string) string {
		switch k {
		case "OPT1":
			return envmap["OPT1"]
		case "OPT2":
			return envmap["OPT2"]
		case "OPT3":
			return envmap["OPT3"]
		}
		return ""
	}

	newS := os.Expand(strings.Join(cmd, " "), envmapper)
	cmd = strings.Split(newS, " ")

	if !c.Bool("quiet") {
		fmt.Printf("Command: %s\n", strings.Join(cmd, " "))
		if c.Bool("display") {
			return nil
		}
	}
	return utils.ExecCmdWithStdStreams(stdIn, stdOut, stdErr, env, cmd[0], cmd[1:]...)
}

func envSliceToMap(env []string) map[string]string {
	m := make(map[string]string)
	for _, i := range env {
		split := strings.Split(i, "=")
		m[split[0]] = strings.Join(split[1:], " ")
	}
	return m
}