Merge another fix for regressions brought about by #375.

--HG--
branch : distribute

CHANGES.txt

@@ -2,6 +2,14 @@
 CHANGES
 =======
 
+------
+0.6.49
+------
+
+* Move warning check in ``get_cache_path`` to follow the directory creation
+  to avoid errors when the cache path does not yet exist. Fixes the error
+  reported in #375.
+
 ------
 0.6.48
 ------

pkg_resources.py

@@ -989,13 +989,14 @@ variable to point to an accessible directory.
         extract, as it tracks the generated names for possible cleanup later.
         """
         extract_path = self.extraction_path or get_default_cache()
-        self._warn_unsafe_extraction_path(extract_path)
         target_path = os.path.join(extract_path, archive_name+'-tmp', *names)
         try:
             _bypass_ensure_directory(target_path)
         except:
             self.extraction_error()
 
+        self._warn_unsafe_extraction_path(extract_path)
+
         self.cached_files[target_path] = 1
         return target_path