[mythtv] rpm build of master using mockchain. git help needed

[John Pilkington]

Hi:  I've been trying to apply Gary's update of his package builder, but 
haven't used git in a build process before and it isn't cooperating. 
This gives the URL but doesn't work.  I've tried others.

  git checkout master; git cherry-pick -x 
https://github.com/garybuhrmaster/packaging/commit/009cbba58bc6f34d920de40bcfe7741712ccbb60 

Already on 'master'
Your branch is up-to-date with 'origin/master'.
fatal: bad revision 
'https://github.com/garybuhrmaster/packaging/commit/009cbba58bc6f34d920de40bcfe7741712ccbb60'

What incantation should I be using?

Thanks,

John P