$ git clone -n https://src.fedoraproject.org/rpms/mairix.git /var/lib/mock/f45-build-17968-506/root/chroot_tmpdir/scmroot/mairix
Cloning into '/var/lib/mock/f45-build-17968-506/root/chroot_tmpdir/scmroot/mairix'...
$ git fetch origin 82b7c552b83b2325dc4eaab42e293570e724b7b9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mairix
 * [new ref]         82b7c552b83b2325dc4eaab42e293570e724b7b9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 82b7c55 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild