$ git clone -n https://src.fedoraproject.org/rpms/toppler.git /var/lib/mock/f45-build-37293-712/root/chroot_tmpdir/scmroot/toppler
Cloning into '/var/lib/mock/f45-build-37293-712/root/chroot_tmpdir/scmroot/toppler'...
$ git fetch origin 121ecf2c83c21573d6f03b537514c3de98feea73:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/toppler
 * [new ref]         121ecf2c83c21573d6f03b537514c3de98feea73 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 121ecf2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild