esky.patch: preserve file mode when patching a file

maxslimmer · Apr 11, 2011 · 335c7c9 · 335c7c9
1 parent e069998
commit 335c7c9
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diff --git a/ChangeLog.txt b/ChangeLog.txt
@@ -3,6 +3,7 @@ v0.9.3
 
     * Preliminary support for a "callback" argument to Esky.auto_update,
       which is called with a dict of status info as update progresses.
+    * esky.patch:  preserve file mode when patching a file.
     * DefaultVersionFinder.open_url: ensure that f.size is always an int.
 
 v0.9.2

diff --git a/esky/patch.py b/esky/patch.py
@@ -361,6 +361,9 @@ def _check_begin_patch(self):
             else:
                 self.infile = BytesIO("".encode("ascii"))
             self.outfile = open(self.new_target,"wb")
+            if os.path.isfile(self.target):
+                mod = os.stat(self.target).st_mode
+                os.chmod(self.new_target,mod)
 
     def _check_end_patch(self):
         """Finish patching the current file, if there is one.