$ git clone -n https://src.fedoraproject.org/rpms/octomap.git /var/lib/mock/f41-build-1037880-18820/root/chroot_tmpdir/scmroot/octomap
Cloning into '/var/lib/mock/f41-build-1037880-18820/root/chroot_tmpdir/scmroot/octomap'...
$ git fetch origin b9e888665cc17a8141ad984d3578ad5058fbb0cf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/octomap
 * [new ref]         b9e888665cc17a8141ad984d3578ad5058fbb0cf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b9e8886 Eliminate use of obsolete %patchN syntax (#2283636)