$ git clone -n https://src.fedoraproject.org/rpms/libacars.git /var/lib/mock/f45-build-15810-479/root/chroot_tmpdir/scmroot/libacars
Cloning into '/var/lib/mock/f45-build-15810-479/root/chroot_tmpdir/scmroot/libacars'...
$ git fetch origin a5dd2fed9a7936b9da6705f3794a376cbf3f29f4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libacars
 * [new ref]         a5dd2fed9a7936b9da6705f3794a376cbf3f29f4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a5dd2fe Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild