$ git clone -n https://src.fedoraproject.org/rpms/jFormatString.git /var/lib/mock/f40-build-2237120-53533/root/chroot_tmpdir/scmroot/jFormatString
Cloning into '/var/lib/mock/f40-build-2237120-53533/root/chroot_tmpdir/scmroot/jFormatString'...
$ git fetch origin f1474bfa719c8c66fb87e5ce06ae7cc3cf5332a9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jFormatString
 * [new ref]         f1474bfa719c8c66fb87e5ce06ae7cc3cf5332a9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f1474bf Remove deprecated %patch syntax