$ git clone -n https://src.fedoraproject.org/rpms/libserf.git /var/lib/mock/f40-build-784393-133362/root/chroot_tmpdir/scmroot/libserf
Cloning into '/var/lib/mock/f40-build-784393-133362/root/chroot_tmpdir/scmroot/libserf'...
$ git fetch origin bb7b30c394b2b710f4eb50f92ec947136fddb137:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libserf
 * [new ref]         bb7b30c394b2b710f4eb50f92ec947136fddb137 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bb7b30c Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild