Re: FreeTDS support for table lookups

On Sun, 9 May 2004, Wietse Venema wrote:

> Victor.Duchovni@MorganStanley.com:
> > - All of multi-parameter map types support both external ".cf" and
> > "mapsource_" prefix notation in main.cf.
>
> The "mapsource_" prefix notation is deprecated. It is confusing
> because the parameters don't show up in postconf(1) output, and
> it encourages storage of passwords in main.cf.

OK, if you insist (an alternative is to enhance "postconf" to output
parameters that are defined in main.cf). The key thing I want to add is
${parameter} substitution even when the map is being defined in external
files. If it were up to me, I would use ${variable} only for main.cf
parameters and use %[alphabet-soup] for key/result substitutions. Likely
that is too radical a change, so we will need to support both with
${special-variable} taking precedence over ${parameter}.

> > - Parameters that hold passwords are read from a file when the parameter
> > value starts with a "file:/" prefix.
>
> There are other main.cf parameters (myhostname) that also need file
> name support. This would avoid the need for Debian's /etc/hostname hack.
>
> Introducing file name syntax for non-map lookup needs to be thought
> out carefully to avoid conflicts (either in code or in the user's
> brain) with map lookup.
>

Yes, I think this makes sense.

> With "mapsource_" prefix notation going away, what is the urgency
> of changing configuration file syntax?
>

I want to be able to say:

server_host = $myldap_host
server_port = $myldap_port
...

in /etc/postfix/everymap.cf. This of course means, that I will be
manually defining my own parameters that don't show up in postconf output
(just as I do for "-o parameter=$transport_specific_value", ...)

I really do think that "postconf" and "postconf -n" (but clearly not "-d")
should show ad-hoc parameter values.

--
Viktor.

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