* Dimitri Fontaine (dimi...@2ndquadrant.fr) wrote:
> Stephen Frost <sfr...@snowman.net> writes:
> > What is the next step to allow an extension pulled down from pgxn to be
> > installed, unchanged, into a given database?
> An extension packaging system.
> Unchanged is not a goal, and not possible even today.

I'm not convinced of that, actually, but you do raise a good point.

> PGXN is a *source based* packaging system. You can't just install what's
> in PGXN on the server's file system then CREATE EXTENSION, you have this
> extra step called the “build”.

Fine- so we need a step that goes from 'source' to 'built'.  I don't see
that step being done in or by a PG backend process.  Adding a new option
which can take a pgxn source and build a script from it which can be run
against PG via libpq is what I'd be going for- but that script *just
installs (or perhaps upgrades) the extension.*  There's no need for that
script, or various upgrade/downgrade/whatever scripts, to be sucked
wholesale into the PG catalog.

> What I want to build is an “extension distribution” software that knows
> how to prepare anything from PGXN (and other places) so that it's fully
> ready for being used in the database. Then the main client would run as
> a CREATE EXTENSION "ddl_command_start" Event Trigger and would fetch the
> prepared extension for you and make it available, then leaving the main
> command operate as intended.

I really don't think that's a good approach.

> Which is what I think the pex extension is doing, and that's not
> coincidental, but it runs the build step on the PostgreSQL server itself
> and needs to have a non-trivial set of file-system privileges to be
> doing so, and even needs to get root privileges with sudo for some of
> its operations.

pex is an interesting beginning to this, but we'd need *some* backend
support for being able to install the extension via libpq (or pex would
need to be modified to not actually use our extension framework at
all for 'trusted' extensions...).



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