$ git clone -n https://src.fedoraproject.org/forks/mjg/rpms/neomutt.git /var/lib/mock/f43-build-58848778-6568609/root/chroot_tmpdir/scmroot/neomutt
Cloning into '/var/lib/mock/f43-build-58848778-6568609/root/chroot_tmpdir/scmroot/neomutt'...
$ git fetch origin 0344f7a83733094fef18e77c777c473b44c7d020:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/forks/mjg/rpms/neomutt
 * [new ref]         0344f7a83733094fef18e77c777c473b44c7d020 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0344f7a exclude i686 arch for i686 leaf package