$ git clone -n https://src.fedoraproject.org/rpms/ikiwiki.git /var/lib/mock/f41-build-side-1-2642472-26798/root/chroot_tmpdir/scmroot/ikiwiki
Cloning into '/var/lib/mock/f41-build-side-1-2642472-26798/root/chroot_tmpdir/scmroot/ikiwiki'...
$ git fetch origin f3e7213a768c9d349fc60c63293e5bf77239cee0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ikiwiki
 * [new ref]         f3e7213a768c9d349fc60c63293e5bf77239cee0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f3e7213 s/%setup0/%setup/