Re: Patch to add hook to copydir()

On 2019-Sep-02, Peter Eisentraut wrote:

> On 2019-09-02 20:54, Swen Kooij wrote:
> > I've been working on an extension that tightly integrates
> > postgres with underlying filesystem . I need to customize
> > how postgres copies directories for new databases.
> 
> Could you share some more details, so we can assess whether that is a
> sensible way to go about it, and what other hooks might be needed?

It seems either terribly high-level, or terribly low-level, depending on
how you look at it.  I wonder to what extent it conflicts with the table
AM work, and with the idea of allowing FDWs to have real relfilenodes.
I wonder if this is just one missing piece that's needed to complete
something of a layer for which other pieces are already satisfied by
other hooks.

As is and pending further explanation, it seems a bad idea to me.  If we
want pluggability here, maybe we need some new abstraction layer.

-- 
Álvaro Herrera                https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services