$ git clone -n https://src.fedoraproject.org/rpms/gmpc.git /var/lib/mock/f29-build-6039-1482/root/thebuilddir/tmp/scmroot/gmpc
Cloning into '/var/lib/mock/f29-build-6039-1482/root/thebuilddir/tmp/scmroot/gmpc'...
$ git reset --hard 2947d55e2d4e82539f999bd122f39a284c2d1cb0
HEAD is now at 2947d55 - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild