$ git clone -n https://src.fedoraproject.org/rpms/tar.git /var/lib/mock/f29-build-1612-562/root/thebuilddir/tmp/scmroot/tar
Cloning into '/var/lib/mock/f29-build-1612-562/root/thebuilddir/tmp/scmroot/tar'...
$ git reset --hard 5a1f48bfcd68c5ad189ac642c5e2f4c78fc1fca9
HEAD is now at 5a1f48b - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild