$ git clone -n https://src.fedoraproject.org/rpms/libserf.git /var/lib/mock/f39-build-1869181-42620/root/chroot_tmpdir/scmroot/libserf
Cloning into '/var/lib/mock/f39-build-1869181-42620/root/chroot_tmpdir/scmroot/libserf'...
$ git fetch origin d33a74d5b0d5e7d0d2e7b0d316ff06c3644054cf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libserf
 * [new ref]         d33a74d5b0d5e7d0d2e7b0d316ff06c3644054cf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d33a74d Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild