$ git clone -n https://src.fedoraproject.org/rpms/libcec.git /var/lib/mock/f45-build-15991-481/root/chroot_tmpdir/scmroot/libcec
Cloning into '/var/lib/mock/f45-build-15991-481/root/chroot_tmpdir/scmroot/libcec'...
$ git fetch origin ffd9458bed649eb5aab0d4a47eba4c26b22e6a98:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libcec
 * [new ref]         ffd9458bed649eb5aab0d4a47eba4c26b22e6a98 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ffd9458 8.1.7 release RHBZ#2509770