$ git clone -n https://src.fedoraproject.org/rpms/elk.git /var/lib/mock/f38-build-722179-98739/root/chroot_tmpdir/scmroot/elk
Cloning into '/var/lib/mock/f38-build-722179-98739/root/chroot_tmpdir/scmroot/elk'...
$ git fetch origin da420ca217249debd632b7370c88aa1f81ff703a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/elk
 * [new ref]         da420ca217249debd632b7370c88aa1f81ff703a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at da420ca Add new sources