can not allow change bw/cpu/ram resource for hdd contract account

contracts/eosio.system/delegate_bandwidth.cpp

@@ -19,6 +19,7 @@
 
 const account_name hdd_deposit_account = N(hdddeposit12);
 const account_name hdd_lock_account = N(hddlock12345);
+const account_name hdd_pool_account = N(hddpool12345);
 //##YTA-Change  end:  
 
 #include <cmath>
@@ -113,6 +114,10 @@ namespace eosiosystem {
       require_auth( payer );
       eosio_assert( quant.amount > 0, "must purchase a positive amount" );
 
+//##YTA-Change  start:
+      check_yta_account(receiver);
+//##YTA-Change  end:            
+
       auto fee = quant;
       fee.amount = ( fee.amount + 199 ) / 200; /// .5% fee (round up)
       // fee.amount cannot be 0 since that is only possible if quant.amount is 0 which is not allowed by the assert above.
@@ -169,6 +174,10 @@ namespace eosiosystem {
       require_auth( account );
       eosio_assert( bytes > 0, "cannot sell negative byte" );
 
+//##YTA-Change  start:
+      check_yta_account(account);
+//##YTA-Change  end:            
+
       user_resources_table  userres( _self, account );
       auto res_itr = userres.find( account );
       eosio_assert( res_itr != userres.end(), "no resource row" );
@@ -224,6 +233,11 @@ namespace eosiosystem {
                      >= std::max( std::abs( stake_net_delta.amount ), std::abs( stake_cpu_delta.amount ) ),
                     "net and cpu deltas cannot be opposite signs" );
 
+//##YTA-Change  start:
+      check_yta_account(receiver);
+//##YTA-Change  end:            
+
+
       account_name source_stake_from = from;
       if ( transfer ) {
          from = receiver;
@@ -445,5 +459,15 @@ namespace eosiosystem {
       refunds_tbl.erase( req );
    }
 
+//##YTA-Change  start:
+   void system_contract::check_yta_account(const account_name user) {
+
+      if(user == hdd_pool_account || user == hdd_deposit_account || user == hdd_lock_account) {
+         eosio_assert(1 == 2, "can not delegatebe and buy ram for this user");
+      }
+   }
+//##YTA-Change  end:   
+
+
 
 } //namespace eosiosystem

contracts/eosio.system/eosio.system.hpp

@@ -316,6 +316,8 @@ namespace eosiosystem {
          void update_producers_yta_totalvotes( account_name owner, double total_votes);              
 
          void delproducer( const account_name producer );
+
+         void check_yta_account( const account_name user );
 //##YTA-Change  end:  
 
          // Implementation details: