$ git clone -n https://src.fedoraproject.org/rpms/neatvnc.git /var/lib/mock/f40-build-761217-121373/root/chroot_tmpdir/scmroot/neatvnc
Cloning into '/var/lib/mock/f40-build-761217-121373/root/chroot_tmpdir/scmroot/neatvnc'...
$ git fetch origin b76cc0b9bc9487c6965e11673e667c5ec2b8316e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/neatvnc
 * [new ref]         b76cc0b9bc9487c6965e11673e667c5ec2b8316e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b76cc0b New version