Comment # 5 on bug 935052 from David Westfall

So if the checksum in the file name is not for integrity, but to indicate that
there are new files in repodata then don't use it.  Use a time stamp instead. 
That would mean more to me that a checksum that maybe incorrect.  A time stamp
would also bring back sorting to repodata.  repomd.xml should also get a time
stamp, then when you look into repodata and see the same time stamp you know
that the repo has finished building.

Checksums are for integrity time stamps indicate change.

timeStamp=`date +%Y%m%d-%H%M`
echo $timeStamp
20150622-0800

Dave W