$ git clone -n https://src.fedoraproject.org/rpms/jflex.git /var/lib/mock/f40-build-2237119-53533/root/chroot_tmpdir/scmroot/jflex
Cloning into '/var/lib/mock/f40-build-2237119-53533/root/chroot_tmpdir/scmroot/jflex'...
$ git fetch origin ac2d16acc591cacc959b3cbdc85fec2e6cd30443:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jflex
 * [new ref]         ac2d16acc591cacc959b3cbdc85fec2e6cd30443 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ac2d16a Update javapackages test plan to f40