Simplify autoreloader, don't need multiprocessing.Process. Now works on OSX py38.

sanic/reloader_helpers.py

@@ -3,7 +3,6 @@ import signal
 import subprocess
 import sys
 
-from multiprocessing import Process
 from time import sleep
 
 
@@ -35,35 +34,27 @@ def _iter_module_files():
 
 def _get_args_for_reloading():
     """Returns the executable."""
-    rv = [sys.executable]
     main_module = sys.modules["__main__"]
     mod_spec = getattr(main_module, "__spec__", None)
+    if sys.argv[0] in ("", "-c"):
+        raise RuntimeError(
+            f"Autoreloader cannot work with argv[0]={sys.argv[0]!r}"
+        )
     if mod_spec:
         # Parent exe was launched as a module rather than a script
-        rv.extend(["-m", mod_spec.name])
+        return [sys.executable, "-m", mod_spec.name] + sys.argv[1:]
-        if len(sys.argv) > 1:
+    return [sys.executable] + sys.argv
-            rv.extend(sys.argv[1:])
-    else:
-        rv.extend(sys.argv)
-    return rv
 
 
 def restart_with_reloader():
     """Create a new process and a subprocess in it with the same arguments as
     this one.
     """
-    cwd = os.getcwd()
+    return subprocess.Popen(
-    args = _get_args_for_reloading()
+        _get_args_for_reloading(),
-    new_environ = os.environ.copy()
+        cwd=os.getcwd(),
-    new_environ["SANIC_SERVER_RUNNING"] = "true"
+        env={**os.environ, "SANIC_SERVER_RUNNING": "true"},
-    cmd = " ".join(args)
-    worker_process = Process(
-        target=subprocess.call,
-        args=(cmd,),
-        kwargs={"cwd": cwd, "shell": True, "env": new_environ},
     )
-    worker_process.start()
-    return worker_process
 
 
 def kill_process_children_unix(pid):