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Re: Largeobject Access Controls and pg_migrator

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: KaiGai Kohei <kaigai(at)kaigai(dot)gr(dot)jp>, KaiGai Kohei <kaigai(at)ak(dot)jp(dot)nec(dot)com>
Cc: Takahiro Itagaki <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Jaime Casanova <jcasanov(at)systemguards(dot)com(dot)ec>, Greg Smith <greg(at)2ndquadrant(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Largeobject Access Controls and pg_migrator
Date: 2009-12-13 02:31:01
Message-ID: 200912130231.nBD2V1b18697@momjian.us (view raw or flat)
Thread:
Lists: pgsql-hackers
Bruce Momjian wrote:
> KaiGai Kohei wrote:
> > lo_import() has an another prototype which takes second argument to
> > specify LOID. Isn't it available to restore a large object with
> > correct LOID? For example, lo_import('/etc/profile', 1234)
> 
> I can't use that because the migration has already brought over the
> pg_largeobject file which has the data.
> 
> > Or, if you intend to restore metadata in the second lo_import(),
> > ALTER LAEGE OBJECT and GRANT LARGE OBJECT enable to set up metadata
> > of a certain large object.
> 
> Yes, that will work cleanly.  The file might be large because I need a
> GRANT for every large object, but I suppose that is OK.

Uh, I tested pg_migrator and found a problem with this approach:

	test=> select loid from pg_largeobject;
	 loid
	-------
	 16385
	 16385
	 16386
	(3 rows)
	
	test=> grant all ON LARGE OBJECT 16385 to public;
	ERROR:  large object 16385 does not exist

I am wondering if the missing pg_largeobject_metadata row is causing
this, and again I have no way of creating one with the specified oid.

-- 
  Bruce Momjian  <bruce(at)momjian(dot)us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + If your life is a hard drive, Christ can be your backup. +

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