scripts/modules/module_block: Use Python 3 interpreter & add pseudo-main

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20200512103238.7078-6-philmd@redhat.com>

scripts/modules/module_block.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
 #
 # Module information generator
 #
@@ -80,19 +80,20 @@ def print_bottom(fheader):
 #endif
 ''')
 
-# First argument: output file
-# All other arguments: modules source files (.c)
-output_file = sys.argv[1]
-with open(output_file, 'w') as fheader:
-    print_top(fheader)
+if __name__ == '__main__':
+    # First argument: output file
+    # All other arguments: modules source files (.c)
+    output_file = sys.argv[1]
+    with open(output_file, 'w') as fheader:
+        print_top(fheader)
 
-    for filename in sys.argv[2:]:
-        if os.path.isfile(filename):
-            process_file(fheader, filename)
-        else:
-            print("File " + filename + " does not exist.", file=sys.stderr)
-            sys.exit(1)
+        for filename in sys.argv[2:]:
+            if os.path.isfile(filename):
+                process_file(fheader, filename)
+            else:
+                print("File " + filename + " does not exist.", file=sys.stderr)
+                sys.exit(1)
 
-    print_bottom(fheader)
+        print_bottom(fheader)
 
-sys.exit(0)
+    sys.exit(0)