Origin for each line in cleartmp.init.mk from check-in 29803f148a:

5621f7a556 2019-10-21        arcade: cleartmp: mountlate
5621f7a556 2019-10-21        arcade: 	echo "MRC:$@> Clearing tmp."; \
5621f7a556 2019-10-21        arcade: 	find -x /tmp -mindepth 1 ! -name lost+found \
5621f7a556 2019-10-21        arcade: 	    ! -name snapshots ! -path "./snapshots/*" \
5621f7a556 2019-10-21        arcade: 	    ! -name quota.user ! -name quota.group \
29803f148a 2019-10-22        arcade: 	    -delete -type d -prune ;\
29803f148a 2019-10-22        arcade: 	  rm -f /tmp/.X*-lock ;\
29803f148a 2019-10-22        arcade: 	  rm -fr /tmp/.X11-unix ;\
5621f7a556 2019-10-21        arcade: 	  mkdir -m 1777 /tmp/.X11-unix