Make (--help, --version, ...) work as non root

- "root" check will be performed after arpaser
- The help message will be automatically show when there are no root rights. Along to the notification that this program need root rights.

embyupdater/__init__.py

@@ -175,12 +175,6 @@ def updater(allow_prereleases, download_path, quiet):
 
 
 def main():
-    if os.geteuid() != 0:
-        print('''You need to have root privileges to run this script.
-Please try again, this time using 'sudo'.
-Exiting.''', file=sys.stderr)
-        sys.exit(1)
-
     parser = argparse.ArgumentParser(
         formatter_class=argparse.RawDescriptionHelpFormatter,
         description='emby-updater will help you to install Emby (updates) easily.',
@@ -199,6 +193,19 @@ def main():
                         action='store_true')
     args = parser.parse_args()
 
+    if os.geteuid() != 0:
+        print('''
+##########
+# You need to have root privileges to run this script.
+# Please try again, this time using 'sudo'.
+##########
+
+''', file=sys.stderr)
+        parser.print_help()
+        print('''
+Exiting.''', file=sys.stderr)
+        sys.exit(1)
+
     if args.update:
         self_update(args.download_path, args.yes)
     else: