$ git clone -n https://src.fedoraproject.org/rpms/x11vnc.git /var/lib/mock/f43-build-59264106-6572334/root/chroot_tmpdir/scmroot/x11vnc
Cloning into '/var/lib/mock/f43-build-59264106-6572334/root/chroot_tmpdir/scmroot/x11vnc'...
$ git fetch origin b3edb2627bc20fabf6a3236114088512495edf5f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/x11vnc
 * [new ref]         b3edb2627bc20fabf6a3236114088512495edf5f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b3edb26 0.9.17 bump