$ git clone -n https://src.fedoraproject.org/rpms/libcerf.git /var/lib/mock/f40-build-785859-134129/root/chroot_tmpdir/scmroot/libcerf
Cloning into '/var/lib/mock/f40-build-785859-134129/root/chroot_tmpdir/scmroot/libcerf'...
$ git fetch origin c2099dcec50dca271efb9609e0ee929ad87767c0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libcerf
 * [new ref]         c2099dcec50dca271efb9609e0ee929ad87767c0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c2099dc Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild