$ git clone -n https://src.fedoraproject.org/rpms/fs_mark.git /var/lib/mock/f45-build-9303-401/root/chroot_tmpdir/scmroot/fs_mark
Cloning into '/var/lib/mock/f45-build-9303-401/root/chroot_tmpdir/scmroot/fs_mark'...
$ git fetch origin 6955cf9ab11d2783aa657d5bbe6adc5c67a4dce9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fs_mark
 * [new ref]         6955cf9ab11d2783aa657d5bbe6adc5c67a4dce9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6955cf9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild