add some simple error checking at startup

esgd.py

@@ -193,6 +193,7 @@ location = "/tmp/test"
 if __name__ == "__main__":
     switchgrp = grp.getgrnam("nobody").gr_gid
     switchusr = pwd.getpwnam("nobody").pw_uid
+    try:
         with socketserver.TCPServer((host, port), GopherHandler) as server:
             os.setgid(switchgrp)
             os.seteuid(switchusr)
@@ -200,3 +201,7 @@ if __name__ == "__main__":
             os.chdir(location)
             log.log("change directory successful")
             server.serve_forever()
+    except PermissionError:
+        log.error("invalid permissions")
+    except OSError:
+        log.error("address already in use")