Fix for yet unpublished issue to ensure that get_resource_filename always...

Fix for yet unpublished issue to ensure that get_resource_filename always re-extracts the content of a temporary filename if it does not match that of the source content.

--HG--
branch : distribute
extra : rebase_source : 5605ee258010cde1237db058b770c62264c215e2

CHANGES.txt

@@ -3,6 +3,13 @@ CHANGES
 =======
 
 ------
+0.6.39
+------
+
+* Issue ####: Resources extracted from a zip egg to the file system now also
+  check the contents of the file against the zip contents during each
+  invocation of get_resource_filename.
+
 0.6.38
 ------
 

pkg_resources.py

@@ -1459,7 +1459,14 @@ class ZipProvider(EggProvider):
         if not os.path.isfile(file_path):
             return False
         stat = os.stat(file_path)
-        return stat.st_size==size and stat.st_mtime==timestamp
+        if stat.st_size!=size or stat.st_mtime!=timestamp:
+            return False
+        # check that the contents match
+        zip_contents = self.loader.get_data(zip_path)
+        f = open(file_path, 'rb')
+        file_contents = f.read()
+        f.close()
+        return zip_contents == file_contents
 
     def _get_eager_resources(self):
         if self.eagers is None: