aboutsummaryrefslogtreecommitdiff
path: root/cmd/podman/service.go
blob: 3e0ff927f33e24d1fe9bd428140e846fbcdea8a3 (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
// +build varlink,!remoteclient

package main

import (
	"fmt"
	"net"
	"os"
	"path/filepath"
	"strings"
	"time"

	"github.com/containers/libpod/cmd/podman/cliconfig"
	"github.com/containers/libpod/cmd/podman/libpodruntime"
	iopodman "github.com/containers/libpod/cmd/podman/varlink"
	"github.com/containers/libpod/libpod"
	"github.com/containers/libpod/pkg/adapter"
	api "github.com/containers/libpod/pkg/api/server"
	"github.com/containers/libpod/pkg/rootless"
	"github.com/containers/libpod/pkg/systemd"
	"github.com/containers/libpod/pkg/util"
	"github.com/containers/libpod/pkg/varlinkapi"
	"github.com/containers/libpod/version"
	"github.com/pkg/errors"
	"github.com/sirupsen/logrus"
	"github.com/spf13/cobra"
	"github.com/varlink/go/varlink"
)

var (
	serviceCommand     cliconfig.ServiceValues
	serviceDescription = `Run an API service

Enable a listening service for API access to Podman commands.
`

	_serviceCommand = &cobra.Command{
		Use:   "service [flags] [URI]",
		Short: "Run API service",
		Long:  serviceDescription,
		RunE: func(cmd *cobra.Command, args []string) error {
			serviceCommand.InputArgs = args
			serviceCommand.GlobalFlags = MainGlobalOpts
			return serviceCmd(&serviceCommand)
		},
	}
)

func init() {
	serviceCommand.Command = _serviceCommand
	serviceCommand.SetHelpTemplate(HelpTemplate())
	serviceCommand.SetUsageTemplate(UsageTemplate())
	flags := serviceCommand.Flags()
	flags.Int64VarP(&serviceCommand.Timeout, "timeout", "t", 5, "Time until the service session expires in seconds.  Use 0 to disable the timeout")
	flags.BoolVar(&serviceCommand.Varlink, "varlink", false, "Use legacy varlink service instead of REST")
}

func serviceCmd(c *cliconfig.ServiceValues) error {
	apiURI, err := resolveApiURI(c)
	if err != nil {
		return err
	}

	// Create a single runtime api consumption
	runtime, err := libpodruntime.GetRuntimeDisableFDs(getContext(), &c.PodmanCommand)
	if err != nil {
		return errors.Wrapf(err, "error creating libpod runtime")
	}
	defer func() {
		if err := runtime.Shutdown(false); err != nil {
			fmt.Fprintf(os.Stderr, "Failed to shutdown libpod runtime: %v", err)
		}
	}()

	timeout := time.Duration(c.Timeout) * time.Second
	if c.Varlink {
		return runVarlink(runtime, apiURI, timeout, c)
	}
	return runREST(runtime, apiURI, timeout)
}

func resolveApiURI(c *cliconfig.ServiceValues) (string, error) {
	var apiURI string

	// When determining _*THE*_ listening endpoint --
	// 1) User input wins always
	// 2) systemd socket activation
	// 3) rootless honors XDG_RUNTIME_DIR
	// 4) if varlink -- adapter.DefaultVarlinkAddress
	// 5) lastly adapter.DefaultAPIAddress

	if len(c.InputArgs) > 0 {
		apiURI = c.InputArgs[0]
	} else if ok := systemd.SocketActivated(); ok {
		apiURI = ""
	} else if rootless.IsRootless() {
		xdg, err := util.GetRuntimeDir()
		if err != nil {
			return "", err
		}
		socketName := "podman.sock"
		if c.Varlink {
			socketName = "io.podman"
		}
		socketDir := filepath.Join(xdg, "podman", socketName)
		if _, err := os.Stat(filepath.Dir(socketDir)); err != nil {
			if os.IsNotExist(err) {
				if err := os.Mkdir(filepath.Dir(socketDir), 0755); err != nil {
					return "", err
				}
			} else {
				return "", err
			}
		}
		apiURI = "unix:" + socketDir
	} else if c.Varlink {
		apiURI = adapter.DefaultVarlinkAddress
	} else {
		// For V2, default to the REST socket
		apiURI = adapter.DefaultAPIAddress
	}

	if "" == apiURI {
		logrus.Info("using systemd socket activation to determine API endpoint")
	} else {
		logrus.Infof("using API endpoint: %s", apiURI)
	}
	return apiURI, nil
}

func runREST(r *libpod.Runtime, uri string, timeout time.Duration) error {
	logrus.Warn("This function is EXPERIMENTAL")
	fmt.Println("This function is EXPERIMENTAL.")

	var listener *net.Listener
	if uri != "" {
		fields := strings.Split(uri, ":")
		if len(fields) == 1 {
			return errors.Errorf("%s is an invalid socket destination", uri)
		}
		address := strings.Join(fields[1:], ":")
		l, err := net.Listen(fields[0], address)
		if err != nil {
			return errors.Wrapf(err, "unable to create socket %s", uri)
		}
		defer l.Close()
		listener = &l
	}
	server, err := api.NewServerWithSettings(r, timeout, listener)
	if err != nil {
		return err
	}
	defer func() {
		if err := server.Shutdown(); err != nil {
			fmt.Fprintf(os.Stderr, "Error when stopping service: %s", err)
		}
	}()

	err = server.Serve()
	logrus.Debugf("%d/%d Active connections/Total connections\n", server.ActiveConnections, server.TotalConnections)
	return err
}

func runVarlink(r *libpod.Runtime, uri string, timeout time.Duration, c *cliconfig.ServiceValues) error {
	var varlinkInterfaces = []*iopodman.VarlinkInterface{varlinkapi.New(&c.PodmanCommand, r)}
	service, err := varlink.NewService(
		"Atomic",
		"podman",
		version.Version,
		"https://github.com/containers/libpod",
	)
	if err != nil {
		return errors.Wrapf(err, "unable to create new varlink service")
	}

	for _, i := range varlinkInterfaces {
		if err := service.RegisterInterface(i); err != nil {
			return errors.Errorf("unable to register varlink interface %v", i)
		}
	}

	// Run the varlink server at the given address
	if err = service.Listen(uri, timeout); err != nil {
		switch err.(type) {
		case varlink.ServiceTimeoutError:
			logrus.Infof("varlink service expired (use --timeout to increase session time beyond %d ms, 0 means never timeout)", timeout.String())
			return nil
		default:
			return errors.Wrapf(err, "unable to start varlink service")
		}
	}
	return nil
}