Re: How was I able to drop a role even though objects depend on it?

Alvaro Herrera-9 wrote
> David Johnston wrote:
>> Wojciechowski, Robert (GE Transportation) wrote
>> > [...] there is a database that shows this connect grant to a user that
>> was
>> > known as foo1_userA (oid 3562339547): 3562339547=c/postgres
>>
>> The main user dependent situation is having said user OWNER on a database
>> object. Simply giving a user connect privileges on a database does not
>> make
>> the database dependent upon said user and so removing said user remains
>> possible.
>
> Dropping a user which is either a database owner or has been granted
> CONNECT privileges is supposed to be disallowed:
>
> alvherre=# create user f;
> CREATE ROLE
> alvherre=# create database f owner f;
> CREATE DATABASE
> alvherre=# drop role f;
> ERROR: role "f" cannot be dropped because some objects depend on it
> DETALLE: owner of database f
> alvherre=# create role g;
> CREATE ROLE
> alvherre=# grant connect on database f to g;
> GRANT
> alvherre=# drop role g;
> ERROR: role "g" cannot be dropped because some objects depend on it
> DETALLE: privileges for database f
>
> We're supposed to have sufficient locking so that concurrent
> transactions don't see problems either (one xact drops the user while
> the other creates the database), but maybe there are bugs somewhere.

OK. Looking at the documentation for this I see where this is stated though
I read it that only direct permissions are evaluated. If foo1_userA is
getting permission to connect to database "postgres" via a parent role then
foo1_userA can be dropped since it would not need/have direct connect
privileges but would still how up as being allowed by the system. I don't
know whether 3562339547 = c/postgres would show up only in the direct case
or if also via inheritance - and I'm not totally sure where this is actually
being queried in the first place.

David J.

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