Pass the pid to the installer as a cmd arg

bootstrap/bootstrap.py

@@ -102,7 +102,7 @@ class LoaderPageRequestHandler(SimpleHTTPRequestHandler):
         elif self.path == "/index.html" or self.path == "/favicon.ico":
             return SimpleHTTPRequestHandler.do_GET(self)
         elif self.path == "/":
-            self.send_response(301)
+            self.send_response(302)
             self.send_header('Location','/index.html')
             self.end_headers()
         else:
@@ -115,7 +115,8 @@ def serve_forever(server):
         pass
 
 def main():
-    if "--temporary-page" in sys.argv:
+    temp_page_flag = "--temporary-page"
+    if temp_page_flag in sys.argv:
         # Serve the loading page until TLJH builds
         index_url="https://raw.githubusercontent.com/GeorgianaElena/the-littlest-jupyterhub/in-progress-page/bootstrap/index.html"
         favicon_url="https://raw.githubusercontent.com/jupyterhub/jupyterhub/master/share/jupyterhub/static/favicon.ico"
@@ -127,8 +128,8 @@ def main():
             loading_page_server = HTTPServer(("", 80), LoaderPageRequestHandler)
             p = multiprocessing.Process(target=serve_forever, args=(loading_page_server,))
             p.start()
-            with open('/loading.pid', 'w+') as f:
-                f.write(str(p.pid))
+            # Put the pid after the temp page flag to be passed to the istaller
+            sys.argv.insert(sys.argv.index(temp_page_flag)+1, str(p.pid))
         except OSError:
             # Only serve the loading page when installing TLJH
             pass

tljh/installer.py

@@ -488,8 +488,6 @@ def main():
     )
     argparser.add_argument(
         '--temporary-page',
-        action='store_true',
-        default=False,
         help='Serve a temporary page while TLJH is building'
     )
 
@@ -509,13 +507,9 @@ def main():
 
     # Stop the http server with the loading page before traefik starts
     if args.temporary_page:
-        pidfile = "/loading.pid"
         try:
-            with open(pidfile, "r") as f:
-                pid = f.read()
-            os.kill(int(pid), signal.SIGINT)
+            os.kill(int(args.temporary_page), signal.SIGINT)
             # Remove the pid file and the temporary html page
-            os.remove(pidfile)
             os.remove('/index.html')
             os.remove('/favicon.ico')
         except Exception as e: