ownCloud 8.1.1 broke upgrades: do "occ upgrade" twice

Per https://github.com/owncloud/core/issues/18224 and https://discourse.mailinabox.email/t/v13-upgrade-issue-with-calendar/757/10, upgrades from anything to ownCloud 8.1.1 were broken. But the workaround is to run the upgrade step twice.

setup/owncloud.sh

@@ -70,8 +70,16 @@ if [ ! -d /usr/local/lib/owncloud/ ] \
 	# If this isn't a new installation, immediately run the upgrade script.
 	# Then check for success (0=ok and 3=no upgrade needed, both are success).
 	if [ -f $STORAGE_ROOT/owncloud/owncloud.db ]; then
+		# ownCloud 8.1.1 broke upgrades. It may fail on the first attempt, but
+		# that can be OK.
+		sudo -u www-data php /usr/local/lib/owncloud/occ upgrade
+		if [ \( $? -ne 0 \) -a \( $? -ne 3 \) ]; then
+			echo "Trying ownCloud upgrade again to work around ownCloud upgrade bug..."
 			sudo -u www-data php /usr/local/lib/owncloud/occ upgrade
 			if [ \( $? -ne 0 \) -a \( $? -ne 3 \) ]; then exit 1; fi
+			sudo -u www-data php /usr/local/lib/owncloud/occ maintenance:mode --off
+			echo "...which seemed to work."
+		fi
 	fi
 fi