$ git clone -n https://src.fedoraproject.org/rpms/libsysstat.git /var/lib/mock/f41-build-side-1-2645492-27108/root/chroot_tmpdir/scmroot/libsysstat
Cloning into '/var/lib/mock/f41-build-side-1-2645492-27108/root/chroot_tmpdir/scmroot/libsysstat'...
$ git fetch origin d09b6b02e08bc685294df1265d0672eeb638542a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libsysstat
 * [new ref]         d09b6b02e08bc685294df1265d0672eeb638542a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d09b6b0 1.0.0