Re: WAL's listing in pg_xlog by some sql query

On Fri, Jun 3, 2016 at 4:30 AM Stephen Frost <sfrost(at)snowman(dot)net> wrote:

> * Sameer Kumar (sameer(dot)kumar(at)ashnik(dot)com) wrote:
> > On Fri, 3 Jun 2016, 12:14 a.m. Alex Ignatov, <a(dot)ignatov(at)postgrespro(dot)ru>
> > wrote:
> > > Can I list all WAL files in pg_xlog by using some sql query in
> Postgres?
> >
> > Try
> >
> > Select pg_ls_dir('pg_xlog');
>
> Note that this currently requires superuser privileges.
>
> Given the usefulness of this specific query and that it could be used
> without risk of the user being able to gain superuser access through it,
> I'd like to see a new function added which does not have the superuser
> check, but is not allowed to be called by public initially either.
>

Can I not wrap it around another user defined function with SECURITY
DEFINER and grant privilege to specific users who can use it?

>
> Something along the lines of 'pg_xlog_file_list()', perhaps. There is a
> check in check_postgres.pl which could take advantage of this also.
> Should be a very straight-forward function to write, perhaps good as a
> starter project for someone.
>
> Thanks!
>
> Stephen
>
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Sameer Kumar | DB Solution Architect
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