prevents multiple copies of same service with lockfile (Chia-Network#…

…4713)

chia/daemon/server.py

@@ -708,6 +708,14 @@ def daemon_launch_lock_path(root_path: Path) -> Path:
     return root_path / "run" / "start-daemon.launching"
 
 
+def service_launch_lock_path(root_path: Path, service: str) -> Path:
+    """
+    A path to a file that is lock when a service is running.
+    """
+    service_name = service.replace(" ", "-").replace("/", "-")
+    return root_path / "run" / f"{service_name}.lock"
+
+
 def pid_path_for_service(root_path: Path, service: str, id: str = "") -> Path:
     """
     Generate a path for a PID file for the given service name.
@@ -766,6 +774,11 @@ def launch_service(root_path: Path, service_command) -> Tuple[subprocess.Popen,
 
     log.debug(f"Launching service with CHIA_ROOT: {os.environ['CHIA_ROOT']}")
 
+    lockfile = singleton(service_launch_lock_path(root_path, service_command))
+    if lockfile is None:
+        logging.error(f"{service_command}: already running")
+        raise subprocess.SubprocessError
+
     # Insert proper e
     service_array = service_command.split()
     service_executable = executable_for_service(service_array[0])