feat: add pidfile parameter to support OpenRC

internal/cmd/main.go

@@ -24,6 +24,22 @@ func NewAppCmd() *cli.Command {
 					serve = true
 					return nil
 				},
+				Flags: []cli.Flag{
+					&cli.StringFlag{
+						Name:  "pidfile",
+						Usage: "`PATH` to the PID file",
+						Action: func(ctx context.Context, command *cli.Command, s string) error {
+							// remove `pidfile` parameter from os.Args
+							for i, arg := range os.Args {
+								if arg == "--pidfile" || arg == "-p" {
+									os.Args = append(os.Args[:i], os.Args[i+2:]...)
+									break
+								}
+							}
+							return nil
+						},
+					},
+				},
 			},
 			{
 				Name:   "reset-password",

internal/process/pid.go

@@ -0,0 +1,25 @@
+package process
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+)
+
+func WritePIDFile(pidFile string) error {
+	pid := os.Getpid()
+	if pid == 0 {
+		return fmt.Errorf("failed to get process ID")
+	}
+
+	pidStr := strconv.Itoa(pid)
+	if err := os.WriteFile(pidFile, []byte(pidStr), 0644); err != nil {
+		return fmt.Errorf("failed to write PID file: %w", err)
+	}
+
+	return nil
+}
+
+func RemovePIDFile(pidFile string) {
+	_ = os.Remove(pidFile)
+}