Automatically check for openup update in cron mode.

That means we can add a cronjob for openup and forget about it until:
* new vulnerability applies to us
* current release becomes unsupported

openup

@@ -78,12 +78,14 @@ fi
 unset _BPLIST
 
 _MEESA=$(readlink -f $0)
+_MEESA_ARGS="${@}"
 _TMPDIR="${_TMPDIR:=/tmp}"
 _TMPCERT=$(mktemp -p ${_TMPDIR} openup-pkg_cert.XXXXXX) || exit 1
 _TMPSPLITCERT=$(mktemp -p ${_TMPDIR} openup-split_cert.XXXXXX) || exit 1
 _TMPUPD=$(mktemp -p ${_TMPDIR} openup-update.XXXXXX) || exit 1
 _TMPVUXML=$(mktemp -p ${_TMPDIR} openup-vuxml.XXXXXX) || exit 1
 
+export _MEESA_ARGS
 export PKG_PATH=${PKG_PATH_UPDATE}:${PKG_PATH_MAIN}
 
 trap "rm -f ${_TMPDIR}/openup-*" 1 2 3 13 15
@@ -143,9 +145,10 @@ update_self() {
 				rtn=$?
 			fi
 			pr_bigarrow "openup has been updated, restarting"
-			_CMD="${_MEESA} -U $@"
+			_CMD="${_MEESA} -U ${_MEESA_ARGS}"
 			pr_smallarrow "${_CMD}"
 			if [ -z "${dryrun}" ]; then
+				export _RUN2=1 # needed for openup -c
 				eval ${_CMD}
 				exit $rtn
 			fi
@@ -216,11 +219,11 @@ if [ -z "${checkmode}" ]; then
 	update_binpatches
 	update_pkg
 else
-	if [ "${nosig}" -o "${noselfupdate}" -o "${dryrun}" ]; then
+	if [ "${nosig}" -o "${noselfupdate}" -o "${dryrun}" -a -z "${_RUN2}" ]; then
 		usage
-	else
-		check_vuxml
 	fi
+	[[ -z ${_RUN2} ]] && update_self >/dev/null
+	check_vuxml
 fi
 
 rm -f ${_TMPDIR}/openup-*