Re: Bug with pg_ctl -w/wait and config-only directories

Excerpts from Bruce Momjian's message of lun oct 03 15:23:47 -0300 2011:
> Peter Eisentraut wrote:
> > On m?n, 2011-10-03 at 11:27 -0400, Bruce Momjian wrote:
> > > Frankly, I am confused how this breakage has gone unreported for so
> > > long.
> > 
> > Well, nobody is required to use pg_ctl, and for the longest time, it was
> > pg_ctl that was considered to be broken (for various other reasons) and
> > avoided in packaged init scripts.
> 
> Yes, but I am now seeing that pg_ctl is really unfixable.  Is the
> config-only directory really a valuable feature if pg_ctl does not work?
> 
> If we could document that pg_ctl (and pg_upgrade) doesn't work with
> config-only directories, at least we would have a consistent API.  The
> question is whether the config-only directory is useful with this
> restriction.

Evidently people that use config-only dirs don't care all that much
about pg_ctl; we'd have a lot of bugs about it otherwise.  But I don't
think that's the case for pg_upgrade.  I think that simply dictating the
combination of conf-only dirs and pg_upgrade doesn't work is not going
to be a very popular choice, particularly if there's a simple workaround
such as adding a symlink.  (This makes me wonder, though, we don't we
require that said symlink is always in place; maybe have postmaster
create it automatically if it's not present?)

My guess is that we could fix the simple case (the one that doesn't
involve a "-o datadir" option) with the parse-and-report option that has
been mentioned, and dictate that the other one doesn't work.  That's
much less likely to cause a problem in practice.

-- 
Álvaro Herrera <alvherre@commandprompt.com>
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