[PATCH] update-copyright.py: Retain file mode

[Bernhard Reutner-Fischer]

Hi!

Ok for trunk?

thanks,

contrib/ChangeLog

2016-06-21  Bernhard Reutner-Fischer  <al...@gcc.gnu.org>

        * update-copyright.py (Copyright.process_file): Retain original
        file mode.
---
 contrib/update-copyright.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/contrib/update-copyright.py b/contrib/update-copyright.py
index ebefa46..04afd18 100755
--- a/contrib/update-copyright.py
+++ b/contrib/update-copyright.py
@@ -393,8 +393,10 @@ class Copyright:
         lines = []
         changed = False
         line_filter = filter.get_line_filter (dir, filename)
+        mode = None
         with open (pathname, 'r') as file:
             prev = None
+            mode = os.fstat (file.fileno()).st_mode
             for line in file:
                 while line:
                     next_line = None
@@ -421,6 +423,7 @@ class Copyright:
             with open (tmp_pathname, 'w') as file:
                 for line in lines:
                     file.write (line)
+                os.fchmod (file.fileno(), mode)
             if self.use_quilt:
                 subprocess.call (['quilt', 'add', pathname])
             os.rename (tmp_pathname, pathname)
-- 
2.8.1