$ git clone -n https://src.fedoraproject.org/rpms/mapbox-variant.git /var/lib/mock/f45-build-18011-506/root/chroot_tmpdir/scmroot/mapbox-variant
Cloning into '/var/lib/mock/f45-build-18011-506/root/chroot_tmpdir/scmroot/mapbox-variant'...
$ git fetch origin f0e39f073ef36a370819a688203b8d28d0239b27:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mapbox-variant
 * [new ref]         f0e39f073ef36a370819a688203b8d28d0239b27 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f0e39f0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild