$ git clone -n https://src.fedoraproject.org/rpms/R-ggplot2movies.git /var/lib/mock/f45-build-6136-346/root/chroot_tmpdir/scmroot/R-ggplot2movies
Cloning into '/var/lib/mock/f45-build-6136-346/root/chroot_tmpdir/scmroot/R-ggplot2movies'...
$ git fetch origin 5165b393c68930a15989e56ba54c5246e10187c1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-ggplot2movies
 * [new ref]         5165b393c68930a15989e56ba54c5246e10187c1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5165b39 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild