refactor: simplify service installation process

README.md

@@ -116,16 +116,10 @@ ss service reload [--name <name>]   # reload config via mihomo's API, no restart
 ss service status [--name <name>]
 ```
 
-Linux / macOS (installing the service needs root):
-```bash
-sudo env SF_CONFIG_DIR=$HOME/basicfiles/cli/ss ss service install
-```
+`install`/`uninstall`/`start`/`stop`/`restart` need root/admin privileges:
 
-Windows (run from an elevated/Administrator shell):
-```powershell
-$env:SF_CONFIG_DIR = "$HOME\basicfiles\cli\ss"
-ss.exe service install
-```
+- **Linux / macOS**: just run the command directly — `ss` re-execs itself under `sudo` automatically, prompting for your password if needed.
+- **Windows**: run from an elevated/Administrator shell — `ss.exe service install`.
 
 ## Development
 

internal/cli/elevate.go

@@ -0,0 +1,57 @@
+package cli
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"runtime"
+
+	"gitea.epss.net.cn/klesh/ss/internal/storage"
+)
+
+// ensureRoot re-execs the current command under sudo if it isn't already
+// running as root. It resolves the config directory *before* elevating and
+// passes it through explicitly as SF_CONFIG_DIR, because sudo resets $HOME
+// to /root's — without this, the elevated process would silently resolve
+// the default config directory under /root instead of the invoking user's
+// home.
+//
+// Windows is handled separately: UAC elevation launches a new process that
+// can't transparently inherit the current console, so internal/service's
+// runAsAdmin instead prints manual elevation instructions rather than
+// auto-elevating.
+func ensureRoot() error {
+	if runtime.GOOS == "windows" {
+		return nil
+	}
+	if os.Geteuid() == 0 {
+		return nil
+	}
+
+	s, err := storage.New()
+	if err != nil {
+		return fmt.Errorf("failed to resolve config directory: %w", err)
+	}
+
+	self, err := os.Executable()
+	if err != nil {
+		return fmt.Errorf("failed to determine executable path: %w", err)
+	}
+
+	sudoPath, err := exec.LookPath("sudo")
+	if err != nil {
+		return fmt.Errorf("this command requires root privileges, but sudo was not found on PATH: %w", err)
+	}
+
+	args := append([]string{"env", "SF_CONFIG_DIR=" + s.ConfigDir, self}, os.Args[1:]...)
+	cmd := exec.Command(sudoPath, args...)
+	cmd.Stdin = os.Stdin
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+
+	runErr := cmd.Run()
+	if cmd.ProcessState != nil {
+		os.Exit(cmd.ProcessState.ExitCode())
+	}
+	return fmt.Errorf("failed to re-exec under sudo: %w", runErr)
+}

internal/cli/service.go

@@ -40,6 +40,9 @@ func newServiceInstallCmd() *cobra.Command {
 		Short: "Install mihomo as a system service",
 		Args:  cobra.NoArgs,
 		RunE: func(cmd *cobra.Command, args []string) error {
+			if err := ensureRoot(); err != nil {
+				return err
+			}
 			m, err := newManagers("", "", "")
 			if err != nil {
 				return err
@@ -62,6 +65,9 @@ func newServiceUninstallCmd() *cobra.Command {
 		Short: "Uninstall mihomo system service",
 		Args:  cobra.NoArgs,
 		RunE: func(cmd *cobra.Command, args []string) error {
+			if err := ensureRoot(); err != nil {
+				return err
+			}
 			m, err := newManagers("", "", "")
 			if err != nil {
 				return err
@@ -83,6 +89,9 @@ func newServiceStartCmd() *cobra.Command {
 		Short: "Start mihomo system service",
 		Args:  cobra.NoArgs,
 		RunE: func(cmd *cobra.Command, args []string) error {
+			if err := ensureRoot(); err != nil {
+				return err
+			}
 			m, err := newManagers("", "", "")
 			if err != nil {
 				return err
@@ -104,6 +113,9 @@ func newServiceStopCmd() *cobra.Command {
 		Short: "Stop mihomo system service",
 		Args:  cobra.NoArgs,
 		RunE: func(cmd *cobra.Command, args []string) error {
+			if err := ensureRoot(); err != nil {
+				return err
+			}
 			m, err := newManagers("", "", "")
 			if err != nil {
 				return err
@@ -125,6 +137,9 @@ func newServiceRestartCmd() *cobra.Command {
 		Short: "Restart mihomo system service",
 		Args:  cobra.NoArgs,
 		RunE: func(cmd *cobra.Command, args []string) error {
+			if err := ensureRoot(); err != nil {
+				return err
+			}
 			m, err := newManagers("", "", "")
 			if err != nil {
 				return err