summaryrefslogtreecommitdiff
path: root/cmd/podman/generate/systemd.go
blob: 72b2e63350128a7b9607f939e3bee7a849551d04 (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
package pods

import (
	"encoding/json"
	"fmt"
	"os"
	"path/filepath"

	"github.com/containers/common/pkg/completion"
	"github.com/containers/common/pkg/report"
	"github.com/containers/podman/v3/cmd/podman/common"
	"github.com/containers/podman/v3/cmd/podman/registry"
	"github.com/containers/podman/v3/cmd/podman/utils"
	"github.com/containers/podman/v3/pkg/domain/entities"
	"github.com/pkg/errors"
	"github.com/sirupsen/logrus"
	"github.com/spf13/cobra"
)

var (
	files              bool
	format             string
	systemdTimeout     uint
	systemdOptions     = entities.GenerateSystemdOptions{}
	systemdDescription = `Generate systemd units for a pod or container.
  The generated units can later be controlled via systemctl(1).`

	systemdCmd = &cobra.Command{
		Use:               "systemd [options] {CONTAINER|POD}",
		Short:             "Generate systemd units.",
		Long:              systemdDescription,
		RunE:              systemd,
		Args:              cobra.ExactArgs(1),
		ValidArgsFunction: common.AutocompleteContainersAndPods,
		Example: `podman generate systemd CTR
  podman generate systemd --new --time 10 CTR
  podman generate systemd --files --name POD`,
	}
)

func init() {
	registry.Commands = append(registry.Commands, registry.CliCommand{
		Mode:    []entities.EngineMode{entities.ABIMode, entities.TunnelMode},
		Command: systemdCmd,
		Parent:  generateCmd,
	})
	flags := systemdCmd.Flags()
	flags.BoolVarP(&systemdOptions.Name, "name", "n", false, "Use container/pod names instead of IDs")
	flags.BoolVarP(&files, "files", "f", false, "Generate .service files instead of printing to stdout")

	timeFlagName := "time"
	flags.UintVarP(&systemdTimeout, timeFlagName, "t", containerConfig.Engine.StopTimeout, "Stop timeout override")
	_ = systemdCmd.RegisterFlagCompletionFunc(timeFlagName, completion.AutocompleteNone)
	flags.BoolVarP(&systemdOptions.New, "new", "", false, "Create a new container instead of starting an existing one")
	flags.BoolVarP(&systemdOptions.NoHeader, "no-header", "", false, "Skip header generation")

	containerPrefixFlagName := "container-prefix"
	flags.StringVar(&systemdOptions.ContainerPrefix, containerPrefixFlagName, "container", "Systemd unit name prefix for containers")
	_ = systemdCmd.RegisterFlagCompletionFunc(containerPrefixFlagName, completion.AutocompleteNone)

	podPrefixFlagName := "pod-prefix"
	flags.StringVar(&systemdOptions.PodPrefix, podPrefixFlagName, "pod", "Systemd unit name prefix for pods")
	_ = systemdCmd.RegisterFlagCompletionFunc(podPrefixFlagName, completion.AutocompleteNone)

	separatorFlagName := "separator"
	flags.StringVar(&systemdOptions.Separator, separatorFlagName, "-", "Systemd unit name separator between name/id and prefix")
	_ = systemdCmd.RegisterFlagCompletionFunc(separatorFlagName, completion.AutocompleteNone)

	restartPolicyFlagName := "restart-policy"
	flags.StringVar(&systemdOptions.RestartPolicy, restartPolicyFlagName, "on-failure", "Systemd restart-policy")
	_ = systemdCmd.RegisterFlagCompletionFunc(restartPolicyFlagName, common.AutocompleteSystemdRestartOptions)

	formatFlagName := "format"
	flags.StringVar(&format, formatFlagName, "", "Print the created units in specified format (json)")
	_ = systemdCmd.RegisterFlagCompletionFunc(formatFlagName, common.AutocompleteFormat(nil))

	flags.SetNormalizeFunc(utils.AliasFlags)
}

func systemd(cmd *cobra.Command, args []string) error {
	if cmd.Flags().Changed("time") {
		systemdOptions.StopTimeout = &systemdTimeout
	}

	if registry.IsRemote() {
		logrus.Warnln("The generated units should be placed on your remote system")
	}

	reports, err := registry.ContainerEngine().GenerateSystemd(registry.GetContext(), args[0], systemdOptions)
	if err != nil {
		return err
	}

	if files {
		cwd, err := os.Getwd()
		if err != nil {
			return errors.Wrap(err, "error getting current working directory")
		}
		for name, content := range reports.Units {
			path := filepath.Join(cwd, fmt.Sprintf("%s.service", name))
			f, err := os.Create(path)
			if err != nil {
				return err
			}
			_, err = f.WriteString(content)
			if err != nil {
				return err
			}
			err = f.Close()
			if err != nil {
				return err
			}

			// add newline if default format is given
			if format == "" {
				path += "\n"
			}
			// modify in place so we can print the
			// paths when --files is set
			reports.Units[name] = path
		}
	}

	switch {
	case report.IsJSON(format):
		return printJSON(reports.Units)
	case format == "":
		return printDefault(reports.Units)
	default:
		return errors.Errorf("unknown --format argument: %s", format)
	}
}

func printDefault(units map[string]string) error {
	for _, content := range units {
		fmt.Print(content)
	}
	return nil
}

func printJSON(units map[string]string) error {
	b, err := json.MarshalIndent(units, "", " ")
	if err != nil {
		return err
	}
	fmt.Println(string(b))
	return nil
}