aboutsummaryrefslogtreecommitdiff
path: root/libpod/container_commit.go
blob: 82115455a9839acbc902e86038fc816b9e5edd5a (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
package libpod

import (
	"context"
	"fmt"
	"os"
	"strings"

	"github.com/containers/buildah"
	"github.com/containers/buildah/util"
	is "github.com/containers/image/storage"
	"github.com/containers/libpod/libpod/events"
	"github.com/containers/libpod/libpod/image"
	"github.com/pkg/errors"
	"github.com/sirupsen/logrus"
)

// ContainerCommitOptions is a struct used to commit a container to an image
// It uses buildah's CommitOptions as a base. Long-term we might wish to
// add these to the buildah struct once buildah is more integrated with
//libpod
type ContainerCommitOptions struct {
	buildah.CommitOptions
	Pause          bool
	IncludeVolumes bool
	Author         string
	Message        string
	Changes        []string
}

// Commit commits the changes between a container and its image, creating a new
// image
func (c *Container) Commit(ctx context.Context, destImage string, options ContainerCommitOptions) (*image.Image, error) {
	var (
		isEnvCleared, isLabelCleared, isExposeCleared, isVolumeCleared bool
	)

	if c.config.Rootfs != "" {
		return nil, errors.Errorf("cannot commit a container that uses an exploded rootfs")
	}

	if !c.batched {
		c.lock.Lock()
		defer c.lock.Unlock()

		if err := c.syncContainer(); err != nil {
			return nil, err
		}
	}

	if c.state.State == ContainerStateRunning && options.Pause {
		if err := c.ociRuntime.pauseContainer(c); err != nil {
			return nil, errors.Wrapf(err, "error pausing container %q", c.ID())
		}
		defer func() {
			if err := c.ociRuntime.unpauseContainer(c); err != nil {
				logrus.Errorf("error unpausing container %q: %v", c.ID(), err)
			}
		}()
	}

	sc := image.GetSystemContext(options.SignaturePolicyPath, "", false)
	builderOptions := buildah.ImportOptions{
		Container:           c.ID(),
		SignaturePolicyPath: options.SignaturePolicyPath,
	}
	commitOptions := buildah.CommitOptions{
		SignaturePolicyPath:   options.SignaturePolicyPath,
		ReportWriter:          options.ReportWriter,
		SystemContext:         sc,
		PreferredManifestType: options.PreferredManifestType,
	}
	importBuilder, err := buildah.ImportBuilder(ctx, c.runtime.store, builderOptions)
	if err != nil {
		return nil, err
	}

	if options.Author != "" {
		importBuilder.SetMaintainer(options.Author)
	}
	if options.Message != "" {
		importBuilder.SetComment(options.Message)
	}

	// We need to take meta we find in the current container and
	// add it to the resulting image.

	// Entrypoint - always set this first or cmd will get wiped out
	importBuilder.SetEntrypoint(c.config.Entrypoint)

	// Cmd
	importBuilder.SetCmd(c.config.Command)

	// Env
	// TODO - this includes all the default environment vars as well
	// Should we store the ENV we actually want in the spec separately?
	if c.config.Spec.Process != nil {
		for _, e := range c.config.Spec.Process.Env {
			splitEnv := strings.SplitN(e, "=", 2)
			importBuilder.SetEnv(splitEnv[0], splitEnv[1])
		}
	}
	// Expose ports
	for _, p := range c.config.PortMappings {
		importBuilder.SetPort(fmt.Sprintf("%d", p.ContainerPort))
	}
	// Labels
	for k, v := range c.Labels() {
		importBuilder.SetLabel(k, v)
	}
	// No stop signal
	// User
	importBuilder.SetUser(c.User())
	// Volumes
	if options.IncludeVolumes {
		for _, v := range c.config.UserVolumes {
			if v != "" {
				importBuilder.AddVolume(v)
			}
		}
	}
	// Workdir
	importBuilder.SetWorkDir(c.Spec().Process.Cwd)

	genCmd := func(cmd string) []string {
		trim := func(cmd []string) []string {
			if len(cmd) == 0 {
				return cmd
			}

			retCmd := []string{}
			for _, c := range cmd {
				if len(c) >= 2 {
					if c[0] == '"' && c[len(c)-1] == '"' {
						retCmd = append(retCmd, c[1:len(c)-1])
						continue
					}
				}
				retCmd = append(retCmd, c)
			}
			return retCmd
		}
		if strings.HasPrefix(cmd, "[") {
			cmd = strings.TrimPrefix(cmd, "[")
			cmd = strings.TrimSuffix(cmd, "]")
			return trim(strings.Split(cmd, ","))
		}
		return []string{"/bin/sh", "-c", cmd}
	}
	// Process user changes
	for _, change := range options.Changes {
		splitChange := strings.SplitN(change, "=", 2)
		if len(splitChange) != 2 {
			splitChange = strings.SplitN(change, " ", 2)
			if len(splitChange) < 2 {
				return nil, errors.Errorf("invalid change %s format", change)
			}
		}

		switch strings.ToUpper(splitChange[0]) {
		case "CMD":
			importBuilder.SetCmd(genCmd(splitChange[1]))
		case "ENTRYPOINT":
			importBuilder.SetEntrypoint(genCmd(splitChange[1]))
		case "ENV":
			change := strings.Split(splitChange[1], " ")
			name := change[0]
			val := ""
			if len(change) < 2 {
				change = strings.Split(change[0], "=")
			}
			if len(change) < 2 {
				var ok bool
				val, ok = os.LookupEnv(name)
				if !ok {
					return nil, errors.Errorf("invalid env variable %q: not defined in your environment", name)
				}
			} else {
				val = strings.Join(change[1:], " ")
			}
			if !isEnvCleared { // Multiple values are valid, only clear once.
				importBuilder.ClearEnv()
				isEnvCleared = true
			}
			importBuilder.SetEnv(name, val)
		case "EXPOSE":
			if !isExposeCleared { // Multiple values are valid, only clear once
				importBuilder.ClearPorts()
				isExposeCleared = true
			}
			importBuilder.SetPort(splitChange[1])
		case "LABEL":
			change := strings.Split(splitChange[1], " ")
			if len(change) < 2 {
				change = strings.Split(change[0], "=")
			}
			if len(change) < 2 {
				return nil, errors.Errorf("invalid label %s format, requires to NAME=VAL", splitChange[1])
			}
			if !isLabelCleared { // multiple values are valid, only clear once
				importBuilder.ClearLabels()
				isLabelCleared = true
			}
			importBuilder.SetLabel(change[0], strings.Join(change[1:], " "))
		case "ONBUILD":
			importBuilder.SetOnBuild(splitChange[1])
		case "STOPSIGNAL":
			// No Set StopSignal
		case "USER":
			importBuilder.SetUser(splitChange[1])
		case "VOLUME":
			if !isVolumeCleared { // multiple values are valid, only clear once
				importBuilder.ClearVolumes()
				isVolumeCleared = true
			}
			importBuilder.AddVolume(splitChange[1])
		case "WORKDIR":
			importBuilder.SetWorkDir(splitChange[1])
		}
	}
	candidates, _, _, err := util.ResolveName(destImage, "", sc, c.runtime.store)
	if err != nil {
		return nil, errors.Wrapf(err, "error resolving name %q", destImage)
	}
	if len(candidates) == 0 {
		return nil, errors.Errorf("error parsing target image name %q", destImage)
	}
	imageRef, err := is.Transport.ParseStoreReference(c.runtime.store, candidates[0])
	if err != nil {
		return nil, errors.Wrapf(err, "error parsing target image name %q", destImage)
	}
	id, _, _, err := importBuilder.Commit(ctx, imageRef, commitOptions)
	if err != nil {
		return nil, err
	}
	defer c.newContainerEvent(events.Commit)
	return c.runtime.imageRuntime.NewFromLocal(id)
}