rc: update glue for upcoming major updates

(cherry picked from commit 9f315cec)

src/etc/rc

@@ -227,16 +227,25 @@ fi
 
 echo "done."
 
-# regenerate groups and users for packages
+# Regenerate groups and users for packages
 /usr/local/etc/rc.recover pkg > /dev/null
 
 # Recreate capabilities DB
 /usr/bin/cap_mkdb /etc/login.conf
 
+# Perform major updates
+for STAGE in B P; do
+	if opnsense-update -${STAGE}; then
+		echo "Performed deferred update, rebooting now"
+		# ideally reroot with `-r', but panics on ZFS
+		shutdown -or now
+	fi
+done
+
 # Set up the correct php.ini content
 /usr/local/etc/rc.php_ini_setup
 
-# startup configd
+# Startup configd
 /usr/local/etc/rc.d/configd start
 
 # Restore backups from previous shutdown (if any)
@@ -247,7 +256,7 @@ echo "done."
 # Execute the early syshook / plugin commands
 /usr/local/etc/rc.syshook early
 
-# let the PHP-based configuration subsystem set up the system now
+# Let the PHP-based configuration subsystem set up the system now
 echo -n "Launching the init system..."
 touch /var/run/booting
 /usr/local/etc/rc.bootup || exit 1