$ git clone -n https://src.fedoraproject.org/rpms/felix-parent.git /var/lib/mock/f40-build-2198802-51709/root/chroot_tmpdir/scmroot/felix-parent
Cloning into '/var/lib/mock/f40-build-2198802-51709/root/chroot_tmpdir/scmroot/felix-parent'...
$ git fetch origin 2748d245f4b699477ba3eb006c6beef689c05fee:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/felix-parent
 * [new ref]         2748d245f4b699477ba3eb006c6beef689c05fee -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2748d24 Update to upstream version 8