$ isql-fb -q
SQL> create database 'fb5:/home/firebird/xxx.fdb' user 'sysdba' password '1234';
SQL> create table T1(F1 integer);
SQL> create view V1 as select F1, (select count(1) from T1) as CNT from T1;
SQL> insert into T1 values(1);
SQL> insert into T1 values(2);
SQL> commit;
SQL> create user user1 password 'user1';
SQL> create role role1;
SQL> grant role1 to user1;
SQL> grant select on T1 to V1;
SQL> grant select on V1 to role1;
SQL> select * from V1;

          F1                   CNT 
============ ===================== 
           1                     2 
           2                     2 

SQL> show grant role1;
GRANT ROLE1 TO USER1
SQL> show grant V1;
GRANT SELECT ON V1 TO ROLE ROLE1
SQL> show grant T1;
GRANT SELECT ON T1 TO USER V1
SQL> quit;

$ isql-fb -user user1 -password user1 -role role1 -s 3  fb5:/home/firebird/xxx.fdb
Database:  fb5:/home/firebird/xxx.fdb, User: user1, Role: ROLE1
SQL> select * from v1;
Statement failed, SQLSTATE = 28000
no permission for SELECT access to TABLE T1

SQL> show grant role1;
GRANT ROLE1 TO USER1
SQL> show grant T1;
GRANT SELECT ON T1 TO USER V1
SQL> show grant V1;
GRANT SELECT ON V1 TO ROLE ROLE1
SQL> select current_user, current_role from rdb$database;

USER                                                                                          ROLE                                                                                          
=============================================================================== =============================================================================== 
USER1                                                                                         ROLE1                                                                                         

SQL> quit;
$