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package generate
import (
"encoding/json"
"errors"
"fmt"
"os"
"path/filepath"
"github.com/containers/common/pkg/completion"
"github.com/containers/common/pkg/report"
"github.com/containers/podman/v4/cmd/podman/common"
"github.com/containers/podman/v4/cmd/podman/registry"
"github.com/containers/podman/v4/cmd/podman/utils"
"github.com/containers/podman/v4/pkg/domain/entities"
envLib "github.com/containers/podman/v4/pkg/env"
systemDefine "github.com/containers/podman/v4/pkg/systemd/define"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
)
const (
startTimeoutFlagName = "start-timeout"
stopTimeoutFlagName = "stop-timeout"
stopTimeoutCompatFlagName = "time"
restartPolicyFlagName = "restart-policy"
restartSecFlagName = "restart-sec"
newFlagName = "new"
wantsFlagName = "wants"
afterFlagName = "after"
requiresFlagName = "requires"
envFlagName = "env"
)
var (
envInput []string
files bool
format string
systemdRestart string
systemdRestartSec uint
startTimeout uint
stopTimeout 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{
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")
flags.BoolVar(&systemdOptions.TemplateUnitFile, "template", false, "Make it a template file and use %i and %I specifiers. Working only for containers")
flags.UintVarP(&startTimeout, startTimeoutFlagName, "", 0, "Start timeout override")
_ = systemdCmd.RegisterFlagCompletionFunc(startTimeoutFlagName, completion.AutocompleteNone)
// NOTE: initially, there was only a --time/-t flag which mapped to
// stop-timeout. To remain backwards compatible create a hidden flag
// that maps to StopTimeout.
flags.UintVarP(&stopTimeout, stopTimeoutFlagName, "", containerConfig.Engine.StopTimeout, "Stop timeout override")
_ = systemdCmd.RegisterFlagCompletionFunc(stopTimeoutFlagName, completion.AutocompleteNone)
flags.UintVarP(&stopTimeout, stopTimeoutCompatFlagName, "t", containerConfig.Engine.StopTimeout, "Backwards alias for --stop-timeout")
_ = flags.MarkHidden("time")
flags.BoolVar(&systemdOptions.New, newFlagName, false, "Create a new container or pod 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)
flags.StringVar(&systemdRestart, restartPolicyFlagName, systemDefine.DefaultRestartPolicy, "Systemd restart-policy")
_ = systemdCmd.RegisterFlagCompletionFunc(restartPolicyFlagName, common.AutocompleteSystemdRestartOptions)
flags.UintVarP(&systemdRestartSec, restartSecFlagName, "", 0, "Systemd restart-sec")
_ = systemdCmd.RegisterFlagCompletionFunc(restartSecFlagName, completion.AutocompleteNone)
formatFlagName := "format"
flags.StringVar(&format, formatFlagName, "", "Print the created units in specified format (json)")
_ = systemdCmd.RegisterFlagCompletionFunc(formatFlagName, common.AutocompleteFormat(nil))
flags.StringArrayVar(&systemdOptions.Wants, wantsFlagName, nil, "Add (weak) requirement dependencies to the generated unit file")
_ = systemdCmd.RegisterFlagCompletionFunc(wantsFlagName, completion.AutocompleteNone)
flags.StringArrayVar(&systemdOptions.After, afterFlagName, nil, "Add dependencies order to the generated unit file")
_ = systemdCmd.RegisterFlagCompletionFunc(afterFlagName, completion.AutocompleteNone)
flags.StringArrayVar(&systemdOptions.Requires, requiresFlagName, nil, "Similar to wants, but declares stronger requirement dependencies")
_ = systemdCmd.RegisterFlagCompletionFunc(requiresFlagName, completion.AutocompleteNone)
flags.StringArrayVarP(&envInput, envFlagName, "e", nil, "Set environment variables to the systemd unit files")
_ = systemdCmd.RegisterFlagCompletionFunc(envFlagName, completion.AutocompleteNone)
flags.SetNormalizeFunc(utils.TimeoutAliasFlags)
}
func systemd(cmd *cobra.Command, args []string) error {
if cmd.Flags().Changed(restartPolicyFlagName) {
systemdOptions.RestartPolicy = &systemdRestart
}
if registry.IsRemote() {
logrus.Warnln("The generated units should be placed on your remote system")
}
if cmd.Flags().Changed(newFlagName) && !systemdOptions.New && systemdOptions.TemplateUnitFile {
return errors.New("--template cannot be set with --new=false")
}
if !systemdOptions.New && systemdOptions.TemplateUnitFile {
systemdOptions.New = true
}
if cmd.Flags().Changed(restartSecFlagName) {
systemdOptions.RestartSec = &systemdRestartSec
}
if cmd.Flags().Changed(startTimeoutFlagName) {
systemdOptions.StartTimeout = &startTimeout
}
setStopTimeout := 0
if cmd.Flags().Changed(stopTimeoutFlagName) {
setStopTimeout++
}
if cmd.Flags().Changed(stopTimeoutCompatFlagName) {
setStopTimeout++
}
if cmd.Flags().Changed(envFlagName) {
cliEnv, err := envLib.ParseSlice(envInput)
if err != nil {
return fmt.Errorf("error parsing environment variables: %w", err)
}
systemdOptions.AdditionalEnvVariables = envLib.Slice(cliEnv)
}
switch setStopTimeout {
case 1:
systemdOptions.StopTimeout = &stopTimeout
case 2:
return fmt.Errorf("%s and %s are redundant and cannot be used together", stopTimeoutFlagName, stopTimeoutCompatFlagName)
}
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 fmt.Errorf("error getting current working directory: %w", err)
}
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 fmt.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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