mysql service: add some option types

Note that this changes the type and default value of port to int
(previously default was a string, no type).

nixos/modules/services/databases/mysql.nix

@@ -43,6 +43,7 @@ in
     services.mysql = {
 
       enable = mkOption {
+        type = types.bool;
         default = false;
         description = "
           Whether to enable the MySQL server.
@@ -58,16 +59,19 @@ in
       };
 
       port = mkOption {
-        default = "3306";
+        type = types.int;
+        default = 3306;
         description = "Port of MySQL";
       };
 
       user = mkOption {
+        type = types.str;
         default = "mysql";
         description = "User account under which MySQL runs";
       };
 
       dataDir = mkOption {
+        type = types.path;
         default = "/var/mysql"; # !!! should be /var/db/mysql
         description = "Location where MySQL stores its table files";
       };
@@ -78,6 +82,7 @@ in
       };
 
       extraOptions = mkOption {
+        type = types.lines;
         default = "";
         example = ''
           key_buffer_size = 6G
@@ -115,32 +120,39 @@ in
 
       replication = {
         role = mkOption {
+          type = types.enum [ "master" "slave" "none" ];
           default = "none";
-          description = "Role of the MySQL server instance. Can be either: master, slave or none";
+          description = "Role of the MySQL server instance.";
         };
 
         serverId = mkOption {
+          type = types.int;
           default = 1;
           description = "Id of the MySQL server instance. This number must be unique for each instance";
         };
 
         masterHost = mkOption {
+          type = types.str;
           description = "Hostname of the MySQL master server";
         };
 
         slaveHost = mkOption {
+          type = types.str;
           description = "Hostname of the MySQL slave server";
         };
 
         masterUser = mkOption {
+          type = types.str;
           description = "Username of the MySQL replication user";
         };
 
         masterPassword = mkOption {
+          type = types.str;
           description = "Password of the MySQL replication user";
         };
 
         masterPort = mkOption {
+          type = types.int;
           default = 3306;
           description = "Port number on which the MySQL master server runs";
         };