$ git clone -n https://src.fedoraproject.org/rpms/lilypond.git /var/lib/mock/f40-build-796085-140461/root/chroot_tmpdir/scmroot/lilypond
Cloning into '/var/lib/mock/f40-build-796085-140461/root/chroot_tmpdir/scmroot/lilypond'...
$ git fetch origin b48dedf1086a896140c1217ffc2975bd85b5fee3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lilypond
 * [new ref]         b48dedf1086a896140c1217ffc2975bd85b5fee3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b48dedf 2.25.12