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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/v2/cmd/podman/common"
"github.com/containers/podman/v2/cmd/podman/registry"
"github.com/containers/podman/v2/cmd/podman/utils"
"github.com/containers/podman/v2/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] CTR|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")
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.AutocompleteJSONFormat)
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
}
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