refactor: co-locate code for tiger's unix socket initialization

No change, just relocates code.

jupyter_remote_desktop_proxy/setup_websockify.py

@@ -7,18 +7,12 @@
 
 
 def setup_websockify():
-    # make a secure temporary directory for sockets
-    # This is only readable, writeable & searchable by our uid
-    sockets_dir = tempfile.mkdtemp()
-    sockets_path = os.path.join(sockets_dir, 'vnc-socket')
     vncserver = which('vncserver')
-
     if not vncserver:
         raise RuntimeError(
             "vncserver executable not found, please install a VNC server"
         )
 
-    # TigerVNC provides the option to connect a Unix socket. TurboVNC does not.
     # TurboVNC and TigerVNC share the same origin and both use a Perl script
     # as the executable vncserver. We can determine if vncserver is TigerVNC
     # by searching tigervnc string in the Perl script.
@@ -34,6 +28,12 @@ def setup_websockify():
         is_tigervnc = "tigervnc" in vncserver_file.read().casefold()
 
     if is_tigervnc:
+        # Make a secure temporary directory for sockets that is only readable,
+        # writeable, and searchable by our uid - TigerVNC can listen to a Unix
+        # socket!
+        sockets_dir = tempfile.mkdtemp()
+        sockets_path = os.path.join(sockets_dir, 'vnc-socket')
+
         websockify_args = ['--unix-target', sockets_path]
         vnc_args = [vncserver, '-rfbunixpath', sockets_path]
     else: