$ git clone -n https://src.fedoraproject.org/rpms/gpsim.git /var/lib/mock/f40-build-2236695-53519/root/chroot_tmpdir/scmroot/gpsim
Cloning into '/var/lib/mock/f40-build-2236695-53519/root/chroot_tmpdir/scmroot/gpsim'...
$ git fetch origin 323bad67b1117082ad36b43ff5ad1982fcc94c84:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gpsim
 * [new ref]         323bad67b1117082ad36b43ff5ad1982fcc94c84 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 323bad6 new processors and bug fixes