$ git clone -n https://src.fedoraproject.org/rpms/R-docopt.git /var/lib/mock/f45-build-6084-346/root/chroot_tmpdir/scmroot/R-docopt
Cloning into '/var/lib/mock/f45-build-6084-346/root/chroot_tmpdir/scmroot/R-docopt'...
$ git fetch origin 6d49c4cfadf7239d252ae1e27e1feae771f6aec2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-docopt
 * [new ref]         6d49c4cfadf7239d252ae1e27e1feae771f6aec2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6d49c4c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild