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Re: Finer Extension dependencies

From: Dimitri Fontaine <dimitri(at)2ndQuadrant(dot)fr>
To: Hitoshi Harada <umi(dot)tanuki(at)gmail(dot)com>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>, Dimitri Fontaine <dimitri(at)2ndquadrant(dot)fr>, Alvaro Herrera <alvherre(at)commandprompt(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Finer Extension dependencies
Date: 2012-03-29 07:51:30
Message-ID: 87iphnn8u5.fsf@hi-media-techno.com (view raw or flat)
Thread:
Lists: pgsql-hackers
Hitoshi Harada <umi(dot)tanuki(at)gmail(dot)com> writes:
> Frankly I'm still against this patch.  Since I started to review it
> I've never been convinced with the use case.  Yeah, someone said it'd
> be useful to him, but as a developer of some of PGXN modules I don't
> see it.  I totally agree with Robert's point that one feature is not
> standardized and nobody can tell how you can depend on the feature in
> the end.  Mind you, I've never heard about building dependency by its

Ok, we might need to find another word for the concept here. Will think,
would appreciate native speakers' thought.

> name as a string in other packaging system.  If you want to introduce
> the concept of version dependency not feature name dependency, do
> *it*;  I don't think feature dependency solves it.

I don't want to introduce version dependency, because I don't think we
need it. If you want to compare what we're doing here with say debian
packaging, then look at how they package libraries. The major version
number is now part of the package name and you depend on that directly.

So let's take the shortcut to directly depend on the “feature” name.

For a PostgreSQL extension example, we could pick ip4r. That will soon
include support for ipv6 (it's already done code wise, missing docs
update). If you want to use ip4r for storing ipv6, you will simply
require “ip6r” or whatever feature name is provided by the extension
including it.

If you really think this can not be made to work in your use cases,
please provide us with an example where it fails.

Regards,
-- 
Dimitri Fontaine
http://2ndQuadrant.fr     PostgreSQL : Expertise, Formation et Support

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