summaryrefslogtreecommitdiff
path: root/libpod/runtime_pod_infra_linux.go
blob: 3e4185db18cc1b92e4e4085034f57fc5c9098678 (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
// +build linux

package libpod

import (
	"context"
	"strings"

	"github.com/containers/podman/v2/libpod/define"
	"github.com/containers/podman/v2/libpod/image"
	"github.com/containers/podman/v2/pkg/rootless"
	"github.com/containers/podman/v2/pkg/util"
	v1 "github.com/opencontainers/image-spec/specs-go/v1"
	spec "github.com/opencontainers/runtime-spec/specs-go"
	"github.com/opencontainers/runtime-tools/generate"
	"github.com/pkg/errors"
	"github.com/sirupsen/logrus"
)

const (
	// IDTruncLength is the length of the pod's id that will be used to make the
	// infra container name
	IDTruncLength = 12
)

func (r *Runtime) makeInfraContainer(ctx context.Context, p *Pod, imgName, rawImageName, imgID string, config *v1.ImageConfig) (*Container, error) {

	// Set up generator for infra container defaults
	g, err := generate.New("linux")
	if err != nil {
		return nil, err
	}

	// Set Pod hostname
	g.Config.Hostname = p.config.Hostname

	var options []CtrCreateOption

	// Command: If user-specified, use that preferentially.
	// If not set and the config file is set, fall back to that.
	var infraCtrCommand []string
	if p.config.InfraContainer.InfraCommand != nil {
		logrus.Debugf("User-specified infra container entrypoint %v", p.config.InfraContainer.InfraCommand)
		infraCtrCommand = p.config.InfraContainer.InfraCommand
	} else if r.config.Engine.InfraCommand != "" {
		logrus.Debugf("Config-specified infra container entrypoint %s", r.config.Engine.InfraCommand)
		infraCtrCommand = []string{r.config.Engine.InfraCommand}
	}
	// Only if set by the user or containers.conf, we set entrypoint for the
	// infra container.
	// This is only used by commit, so it shouldn't matter... But someone
	// may eventually want to commit an infra container?
	// TODO: Should we actually do this if set by containers.conf?
	if infraCtrCommand != nil {
		// Need to duplicate the array - we are going to add Cmd later
		// so the current array will be changed.
		newArr := make([]string, 0, len(infraCtrCommand))
		newArr = append(newArr, infraCtrCommand...)
		options = append(options, WithEntrypoint(newArr))
	}

	isRootless := rootless.IsRootless()

	// I've seen circumstances where config is being passed as nil.
	// Let's err on the side of safety and make sure it's safe to use.
	if config != nil {
		if infraCtrCommand == nil {
			// If we have no entrypoint and command from the image,
			// we can't go on - the infra container has no command.
			if len(config.Entrypoint) == 0 && len(config.Cmd) == 0 {
				return nil, errors.Errorf("infra container has no command")
			}
			if len(config.Entrypoint) > 0 {
				infraCtrCommand = config.Entrypoint
			} else {
				// Use the Docker default "/bin/sh -c"
				// entrypoint, as we're overriding command.
				// If an image doesn't want this, it can
				// override entrypoint too.
				infraCtrCommand = []string{"/bin/sh", "-c"}
			}
		}
		if len(config.Cmd) > 0 {
			infraCtrCommand = append(infraCtrCommand, config.Cmd...)
		}

		if len(config.Env) > 0 {
			for _, nameValPair := range config.Env {
				nameValSlice := strings.Split(nameValPair, "=")
				if len(nameValSlice) < 2 {
					return nil, errors.Errorf("Invalid environment variable structure in pause image")
				}
				g.AddProcessEnv(nameValSlice[0], nameValSlice[1])
			}
		}

		// Since user namespace sharing is not implemented, we only need to check if it's rootless
		if !p.config.InfraContainer.HostNetwork {
			netmode := "bridge"
			if isRootless || p.config.InfraContainer.Slirp4netns {
				netmode = "slirp4netns"
				if len(p.config.InfraContainer.NetworkOptions) != 0 {
					options = append(options, WithNetworkOptions(p.config.InfraContainer.NetworkOptions))
				}
			}
			// PostConfigureNetNS should not be set since user namespace sharing is not implemented
			// and rootless networking no longer supports post configuration setup
			options = append(options, WithNetNS(p.config.InfraContainer.PortBindings, false, netmode, p.config.InfraContainer.Networks))
		} else if err := g.RemoveLinuxNamespace(string(spec.NetworkNamespace)); err != nil {
			return nil, errors.Wrapf(err, "error removing network namespace from pod %s infra container", p.ID())
		}

		// For each option in InfraContainerConfig - if set, pass into
		// the infra container we're creating with the appropriate
		// With... option.
		if p.config.InfraContainer.StaticIP != nil {
			options = append(options, WithStaticIP(p.config.InfraContainer.StaticIP))
		}
		if p.config.InfraContainer.StaticMAC != nil {
			options = append(options, WithStaticMAC(p.config.InfraContainer.StaticMAC))
		}
		if p.config.InfraContainer.UseImageResolvConf {
			options = append(options, WithUseImageResolvConf())
		}
		if len(p.config.InfraContainer.DNSServer) > 0 {
			options = append(options, WithDNS(p.config.InfraContainer.DNSServer))
		}
		if len(p.config.InfraContainer.DNSSearch) > 0 {
			options = append(options, WithDNSSearch(p.config.InfraContainer.DNSSearch))
		}
		if len(p.config.InfraContainer.DNSOption) > 0 {
			options = append(options, WithDNSOption(p.config.InfraContainer.DNSOption))
		}
		if p.config.InfraContainer.UseImageHosts {
			options = append(options, WithUseImageHosts())
		}
		if len(p.config.InfraContainer.HostAdd) > 0 {
			options = append(options, WithHosts(p.config.InfraContainer.HostAdd))
		}
		if len(p.config.InfraContainer.ExitCommand) > 0 {
			options = append(options, WithExitCommand(p.config.InfraContainer.ExitCommand))
		}
	}

	g.SetRootReadonly(true)
	g.SetProcessArgs(infraCtrCommand)

	logrus.Debugf("Using %q as infra container command", infraCtrCommand)

	g.RemoveMount("/dev/shm")
	if isRootless {
		g.RemoveMount("/dev/pts")
		devPts := spec.Mount{
			Destination: "/dev/pts",
			Type:        "devpts",
			Source:      "devpts",
			Options:     []string{"private", "nosuid", "noexec", "newinstance", "ptmxmode=0666", "mode=0620"},
		}
		g.AddMount(devPts)
	}

	containerName := p.ID()[:IDTruncLength] + "-infra"
	options = append(options, r.WithPod(p))
	options = append(options, WithRootFSFromImage(imgID, imgName, rawImageName))
	options = append(options, WithName(containerName))
	options = append(options, withIsInfra())
	if len(p.config.InfraContainer.ConmonPidFile) > 0 {
		options = append(options, WithConmonPidFile(p.config.InfraContainer.ConmonPidFile))
	}

	return r.newContainer(ctx, g.Config, options...)
}

// createInfraContainer wrap creates an infra container for a pod.
// An infra container becomes the basis for kernel namespace sharing between
// containers in the pod.
func (r *Runtime) createInfraContainer(ctx context.Context, p *Pod) (*Container, error) {
	if !r.valid {
		return nil, define.ErrRuntimeStopped
	}

	img := p.config.InfraContainer.InfraImage
	if img == "" {
		img = r.config.Engine.InfraImage
	}
	newImage, err := r.ImageRuntime().New(ctx, img, "", "", nil, nil, image.SigningOptions{}, nil, util.PullImageMissing)
	if err != nil {
		return nil, err
	}

	data, err := newImage.InspectNoSize(ctx)
	if err != nil {
		return nil, err
	}
	imageName := newImage.Names()[0]
	imageID := data.ID

	return r.makeInfraContainer(ctx, p, imageName, r.config.Engine.InfraImage, imageID, data.Config)
}