Fix install not restarting running service

systemctl start is a no-op when the service is already running,
so upgrades left the old version in memory. Now detects a running
service and issues restart instead.

Author: briankelley

src/devils_advocate/cli.py

@@ -626,6 +626,8 @@ def install_cmd(port, no_start, force):
         service_exists,
         systemctl_daemon_reload,
         systemctl_enable,
+        systemctl_is_active,
+        systemctl_restart,
         systemctl_start,
         write_service_file,
     )
@@ -672,7 +674,10 @@ def install_cmd(port, no_start, force):
         systemctl_daemon_reload()
         systemctl_enable()
         if not no_start:
-            systemctl_start()
+            if systemctl_is_active():
+                systemctl_restart()
+            else:
+                systemctl_start()
     except RuntimeError as e:
         console.print(f"[red]Error:[/red] {e}")
         sys.exit(1)

src/devils_advocate/service.py

@@ -146,6 +146,11 @@ def systemctl_start() -> None:
     _run_systemctl("start", SERVICE_NAME)
 
 
+def systemctl_restart() -> None:
+    """Run ``systemctl --user restart dvad-gui.service``."""
+    _run_systemctl("restart", SERVICE_NAME)
+
+
 def systemctl_stop() -> None:
     """Run ``systemctl --user stop dvad-gui.service``."""
     _run_systemctl("stop", SERVICE_NAME)