$ git clone -n https://src.fedoraproject.org/rpms/nuspell.git /var/lib/mock/f40-build-780128-130688/root/chroot_tmpdir/scmroot/nuspell
Cloning into '/var/lib/mock/f40-build-780128-130688/root/chroot_tmpdir/scmroot/nuspell'...
$ git fetch origin b5a2124004f4f8c06f0de4093a26babce18245e9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nuspell
 * [new ref]         b5a2124004f4f8c06f0de4093a26babce18245e9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b5a2124 Rebuild (icu)