$ git clone -n https://src.fedoraproject.org/rpms/rt.git /var/lib/mock/f41-build-841289-15174/root/chroot_tmpdir/scmroot/rt
Cloning into '/var/lib/mock/f41-build-841289-15174/root/chroot_tmpdir/scmroot/rt'...
$ git fetch origin ac82bff3e28a8838b60c67e5e2011b33427d93d2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rt
 * [new ref]         ac82bff3e28a8838b60c67e5e2011b33427d93d2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ac82bff Update to rt-5.0.7.