$ git clone -n https://src.fedoraproject.org/rpms/xbiso.git /var/lib/mock/f40-build-804723-144601/root/chroot_tmpdir/scmroot/xbiso
Cloning into '/var/lib/mock/f40-build-804723-144601/root/chroot_tmpdir/scmroot/xbiso'...
$ git fetch origin 81a2ae0f9dd794137f99182d5280c6123062b0c3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xbiso
 * [new ref]         81a2ae0f9dd794137f99182d5280c6123062b0c3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 81a2ae0 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild