Patch for TNS services

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Last week I created a patch for the Postgres client side libraries to allow
something like a (not so mighty) form of Oracle TNS, but nobody showed any
interest. Currently, the patch is not perfect yet, but works fine for us. I
want to avoid improving the patch if there is no interest in it, so if you
think it might be a worthy improvement please drop me a line.

It works like this:
The patch allows to supply another parameter to the Postgres connect string,
called "service". So, instead of having a connect string (e.g. in PHP) like
"dbname=foo host=bar port=5433 user=foouser password=barpass"
the string would be
"service=stupid_name_here"
or more often
"service=stupid_name_here user=foouser password=barpass"

There's a config file /etc/pg_service.conf, having an entry like:
[stupid_name_here]
dbname=foo
host=bar
port=5433
....

The advantage is you can go from one database host, database, port or
whatever without having to touch the scripts or applications. We're currently
in the process of migrating all of our PHP and Python scripts to another from
localhost, port 5433 to another machine, port 5432 and it's not something I
ever want to do again, I'd to change around 100 files and I'm still not sure
if I've missed one.

The patch is client-side only, around 100 lines, needs no changes to the
backend and is compatible with all applications supplying a connection string
(not using PQsetdblogin)

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Why is it always Segmentation's fault?
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