Re: pg_upgrade and PGPORT

Bruce Momjian wrote:
> > >> ? ? ? Performing Consistency Checks
> > >> ? ? ? -----------------------------
> > >> ? ? ? ignoring libpq environment variable PGPORT
> > >
> > > I haven't tried it, but I suppose option.c will now make use of PGPORT
> > > and then later you get that message that it was ignored?
> >
> > Either way, it hardly seems necessary to emit a log message stating
> > that you are unsetting an environment variable.
>
> I think the whole idea of worrying about libpq environment variables is
> useless. I looked at the list of libpq environment variables and I saw
> a lot of useful ones, like PGUSER and PGPASSFILE, which we currently
> throw an error.
>
> I propose we only disable the use of PGHOST and even then that prevents
> users from controlling tcp vs. unix domain connections.

OK, it turns out the environment variable handling in pg_upgrade was
worse than I thought. This patch:

o disables only PGHOST and only if it is set to a non-local value;
all other environment variables are honored; PGDATA isn't even seen
by libpq
o push --user value into the PGUSER environment variable so pg_ctl -w
uses it; pg_ctl has no --user flag; this is important for pre-9.1
pg_ctl binaries
o move putenv() function to utils.c now that it is used by option.c
o allow pg_ctl failure to continue with a connection request to get a
possible error message, then exit
o update document to be clearer and mention environment variables

Patch attached.

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

+ It's impossible for everything to be true. +