Sun, 20 Jan 2008 15:32:02 -0500
[svn] Steel FilenameChecker against race conditions.
Since FilenameChecker was just using os.path.exists() to see whether or not
a filename was free, it had a time of check vs. time of use vulnerability.
Matthew was prodding me about the inconsistency with DirectoryChecker, so
that inspired me to fix this. This also entailed some refactoring. Thanks
Matthew.