Configurable location for extension .control files

From: Oliver Charles <ollie(at)ocharles(dot)org(dot)uk>
To: pgsql-hackers(at)postgresql(dot)org
Subject: Configurable location for extension .control files
Date: 2013-06-04 15:31:17
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I am working with the NixOS Linux Distribution [nixos], which has a
fairly radical approach to package management. If you aren't familiar
with it, essentially all packages are installed in isolation - such that
packages cannot interfere with each other.

This is causing a bit of a problem with PostgreSQL extensions that are
usually installed via CREATE EXTENSION. For extensions to be used, a
.control file must be placed in SHAREDIR/extension, but this is not
possible under NixOS as once PostgreSQL is installed that directory is
essentially immutable.

What wolud work best for us is to allow this path to be configurable,
ideally through either an environment variable, command line switch, or
(and this is the least desirable) a postgresql.conf option.

Would love to hear your thoughts. Once I get confirmation on the best
approach to take, I can try my hand at providing a patch.

- Ollie (ocharles)



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