$ git clone -n https://src.fedoraproject.org/rpms/mac.git /var/lib/mock/f45-build-17902-505/root/chroot_tmpdir/scmroot/mac
Cloning into '/var/lib/mock/f45-build-17902-505/root/chroot_tmpdir/scmroot/mac'...
$ git fetch origin 0ad646d6d2f4cd0d0e0f0c27c3d860801aa777d7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mac
 * [new ref]         0ad646d6d2f4cd0d0e0f0c27c3d860801aa777d7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0ad646d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild