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Re: 8.0.0beta1: Ownership of implicit sequences after dump/restore

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Michael Fuhr <mike(at)fuhr(dot)org>
Cc: pgsql-bugs(at)postgresql(dot)org
Subject: Re: 8.0.0beta1: Ownership of implicit sequences after dump/restore
Date: 2004-08-18 00:33:57
Message-ID: 200408180033.i7I0Xwj25570@candle.pha.pa.us (view raw or flat)
Thread:
Lists: pgsql-bugspgsql-hackers
I have reproduced this problem in current CVS.

---------------------------------------------------------------------------

Michael Fuhr wrote:
> PostgreSQL version: 8.0.0beta1
> Operating system  : Solaris 9
> 
> Backups created by pg_dump/pg_dumpall don't set the ownership of
> implicitly-created sequences.  When backups are restored, users who
> created sequences may not be able to use them.
> 
> How to repeat:
> 
> 1. Create a test user and a test database.
> 
>   createuser -P -Upostgres testuser
>   Enter password for new user: ********
>   Enter it again: ********
>   Shall the new user be allowed to create databases? (y/n) n
>   Shall the new user be allowed to create more new users? (y/n) n
> 
>   createdb -Upostgres testdb
> 
> 2. Connect to the test database as the test user, create explicit
> and implicit sequences, then list the sequences.
> 
>   psql -Utestuser testdb
>   CREATE SEQUENCE test_seq;
>   CREATE TABLE stuff (id SERIAL PRIMARY KEY, name TEXT NOT NULL);
>   \ds
>                 List of relations
>    Schema |     Name     |   Type   |  Owner   
>   --------+--------------+----------+----------
>    public | stuff_id_seq | sequence | testuser
>    public | test_seq     | sequence | testuser
>   (2 rows)
> 
> 3. Make a backup of the test database.
> 
>   pg_dump -Upostgres testdb > backup.sql
> 
> 4. Drop the test database.
> 
>   dropdb -Upostgres testdb
> 
> 5. Recreate the test database and restore it.
> 
>   createdb -Upostgres testdb
>   psql -Upostgres -f backup.sql testdb
> 
> 6. Connect to the test database as the test user, show the sequences,
> and try to use the implicitly-created one.
> 
>   psql -Utestuser testdb
>   \ds
>                 List of relations
>    Schema |     Name     |   Type   |  Owner   
>   --------+--------------+----------+----------
>    public | stuff_id_seq | sequence | postgres
>    public | test_seq     | sequence | testuser
>   (2 rows)
> 
>   SELECT nextval('stuff_id_seq');
>   ERROR:  permission denied for sequence stuff_id_seq
> 
> pg_dump sets the ownership of the explicitly-created sequence via
> an ALTER TABLE statement (I see ALTER SEQUENCE ... OWNER TO on the
> TODO list):
> 
>   ALTER TABLE public.test_seq OWNER TO testuser;
> 
> No such statement is issued for the implicitly-created sequence,
> resulting in the sequence being owned by the user who restored the
> database.  This would typically be a database superuser.
> 
> Is this a bug in pg_dump/pg_dumpall, or is it a bug in the ALTER
> TABLE ... OWNER TO statement that set the ownership of the table
> that implicitly created the sequence?  It seems reasonable that
> changing a table's ownership should also change the ownership of
> any implicitly-created sequences, or has that already been discussed
> and rejected?
> 
> Thanks.
> 
> -- 
> Michael Fuhr
> http://www.fuhr.org/~mfuhr/
> 
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-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman(at)candle(dot)pha(dot)pa(dot)us               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073

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