$ git clone -n https://src.fedoraproject.org/rpms/lazarus.git /var/lib/mock/f41-build-1041583-18982/root/chroot_tmpdir/scmroot/lazarus
Cloning into '/var/lib/mock/f41-build-1041583-18982/root/chroot_tmpdir/scmroot/lazarus'...
$ git fetch origin 6f6db655f698fce59dd64f1684c3488bdf2f1981:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lazarus
 * [new ref]         6f6db655f698fce59dd64f1684c3488bdf2f1981 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6f6db65 Backport some upstream patches