out_filename = "{0}{1}.new".format(path, suffix)
if cmd is not None:
with open(in_filename, 'r') as in_fh, open(out_filename, 'w') as out_fh:
- check_call(cmd, stdin=in_fh, stdout=out_fh)
+ check_call(cmd, stdin=in_fh, stdout=out_fh, close_fds=True)
self.rename("{0}{1}".format(path, suffix))
def close(self):