$ git clone -n https://src.fedoraproject.org/rpms/crystal-stacker.git /var/lib/mock/f29-build-6163-1513/root/thebuilddir/tmp/scmroot/crystal-stacker
Cloning into '/var/lib/mock/f29-build-6163-1513/root/thebuilddir/tmp/scmroot/crystal-stacker'...
$ git reset --hard b24d620c604c04da1bfaada53b1cf4b604d524e3
HEAD is now at b24d620 - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild