$ git clone -n https://src.fedoraproject.org/rpms/xaos.git /var/lib/mock/f45-build-38588-725/root/chroot_tmpdir/scmroot/xaos
Cloning into '/var/lib/mock/f45-build-38588-725/root/chroot_tmpdir/scmroot/xaos'...
$ git fetch origin 2d2f7484a7e8ddad4a2d19a2f8b1525772b8406a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xaos
 * [new ref]         2d2f7484a7e8ddad4a2d19a2f8b1525772b8406a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2d2f748 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild