$ git clone -n https://src.fedoraproject.org/rpms/fityk.git /var/lib/mock/f40-build-1858796-24992/root/chroot_tmpdir/scmroot/fityk
Cloning into '/var/lib/mock/f40-build-1858796-24992/root/chroot_tmpdir/scmroot/fityk'...
$ git fetch origin 68d4a0c2f380981d013dd07c67366d2a14372db6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fityk
 * [new ref]         68d4a0c2f380981d013dd07c67366d2a14372db6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 68d4a0c Remove unnecessary escaping in sed invocations