$ git clone -n https://src.fedoraproject.org/rpms/python-plac.git /var/lib/mock/f40-build-2028286-47373/root/chroot_tmpdir/scmroot/python-plac
Cloning into '/var/lib/mock/f40-build-2028286-47373/root/chroot_tmpdir/scmroot/python-plac'...
$ git fetch origin f705e5dfaa681e032138ef1d8a65ec542f37e56f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-plac
 * [new ref]         f705e5dfaa681e032138ef1d8a65ec542f37e56f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f705e5d Fix missing source