Re: alter user set local_preload_libraries.

On Fri, Oct 10, 2014 at 5:36 PM, Kyotaro HORIGUCHI
<horiguchi.kyotaro@lab.ntt.co.jp> wrote:
> Hello, I overlooked this thread.
>
>> On Mon, Sep 15, 2014 at 1:33 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> > Peter Eisentraut <peter_e@gmx.net> writes:
>> >> On 9/1/14 7:51 AM, Kyotaro HORIGUCHI wrote:
>> >>> The attached patch simply changes the context for local_... to
>> >>> PGC_USERSET and edits the doc.
>> >
>> >> I had this ready to commit, but then
>> >
>> >>     Invent PGC_SU_BACKEND and mark log_connections/log_disconnections
>> >> that way.
>> >
>> >> was committed in the meantime.
>> >
>> >> Does this affect what we should do with this change?
>> >
>> >> I guess one thing to look into would be whether we could leave
>> >> local_preload_libraries as PGC_BACKEND and change
>> >> session_preload_libraries to PGC_SU_BACKEND, and then investigate
>> >> whether we could allow settings made with ALTER ROLE / SET to change
>> >> PGC_BACKEND settings.
>> >
>> > Yeah, I was wondering about that while I was making the other commit.
>> > I did not touch those variables at the time, but it would make sense
>> > to restrict them as you suggest.
>>
>> +1
>>
>> Also I think that it's useful to allow ALTER ROLE/DATABASE SET to
>> set PGC_BACKEND and PGC_SU_BACKEND parameters. So, what
>> about applying the attached patch? This patch allows that and
>> changes the context of session_preload_libraries to PGC_SU_BACKEND.
>
> It's not my business to decide to aplly it but I don't see
> obvious problmen in it so far.
>
> By the way, I became unable to login at all after wrongly setting
> *_preload_libraries for all available users. Is there any releaf
> measures for the situation? I think it's okay even if there's no
> way to login again but want to know if any.

Yep, that's a problem. You can login to the server even in that case
by, for example, executing the following commands, though.
   $ export PGOPTIONS="-c *_preload_libraries="   $ psql

Regards,

-- 
Fujii Masao