Re: Extensions Dependency Checking

Aidan Van Dyk <aidan(at)highrise(dot)ca> writes:
> I think the general movement is toward *feature* dependancies. So for
> intstance, an extension can specify what *feature* it requires, and
> difference "versions" of an extension can provide different
> "features".

That sounds like what Emacs is doing too.

> But checking http://developer.postgresql.org/pgdocs/postgres/extend-extensions.html,
> I don't see any "provides" mechanism. That might be something
> actually needed if we are trying to avoid "version" comparisons and
> want to be describing actual dependencies...

The 'provides' mechanism can be added later I think. It's like saying
that in 9.1 an extension 'foo' provides the feature 'foo' and you can't
control that, whereas in future version you will be able to control what
your extension (and its specific version) provides.

Also we will be able to list what the PostgreSQL server provides, maybe,
so that compile time options can be depended on by extensions.

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