$ git clone -n https://src.fedoraproject.org/rpms/fennel.git /var/lib/mock/f40-build-2589846-62582/root/chroot_tmpdir/scmroot/fennel
Cloning into '/var/lib/mock/f40-build-2589846-62582/root/chroot_tmpdir/scmroot/fennel'...
$ git fetch origin ea280c8c61be6b3df79dbdaf1b1ae47f0935c8a5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fennel
 * [new ref]         ea280c8c61be6b3df79dbdaf1b1ae47f0935c8a5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ea280c8 Update to 1.4.2 (rhbz#2265773)