os.access() cannot test for "createable" Fixes #320.

--HG--
branch : distribute
extra : rebase_source : d572b2701ceac9c8a46083cc6658c6eeed86d497

distribute_setup.py

@@ -316,12 +316,12 @@ def _create_fake_setuptools_pkg_info(placeholder):
         log.warn('%s already exists', pkg_info)
         return
 
-    if not os.access(pkg_info, os.W_OK):
-        log.warn("Don't have permissions to write %s, skipping", pkg_info)
-        return
-
     log.warn('Creating %s', pkg_info)
+    try:
         f = open(pkg_info, 'w')
+    except EnvironmentError:
+        log.warn("Don't have permissions to write %s, skipping", pkg_info)
+        return
     try:
         f.write(SETUPTOOLS_PKG_INFO)
     finally: