Bug 747393 - Avoid race condition creating directories in JarMaker. r=ted

config/JarMaker.py

@@ -290,8 +290,9 @@ class JarMaker(object):
       jarfilepath = jarfile + '.jar'
       try:
         os.makedirs(os.path.dirname(jarfilepath))
-      except OSError:
-        pass
+      except OSError, error:
+        if error.errno != errno.EEXIST:
+          raise
       jf = ZipFile(jarfilepath, 'a', lock = True)
       outHelper = self.OutputHelper_jar(jf)
     else:
@@ -423,7 +424,11 @@ class JarMaker(object):
       out = os.path.join(self.basepath, name)
       outdir = os.path.dirname(out)
       if not os.path.isdir(outdir):
-        os.makedirs(outdir)
+        try:
+          os.makedirs(outdir)
+        except OSError, error:
+          if error.errno != errno.EEXIST:
+            raise
       return out
 
   class OutputHelper_symlink(OutputHelper_flat):