Re: How to "tell" a package so extent an environment variable?

[Marius Bakke <mbakke@fastmail.com>]

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Hartmut Goebel <h.goebel@crazy-compilers.com> writes:

> Hi,
>
> I'm working on some PHP extension packages.
>
> In PHP extensions need to be enabled by listing in some .ini file and
> php needs to be told which .ini files to read. The later can be done by
> setting the environment variable PHP_INI_SCAN_DIR when running php (or
> related). This is much like setting PYTHONPATH for python modules.
>
> So I need to "tell" the package so extent PHP_INI_SCAN_DIR when it gets
> installed.
>
> How can this be done without creating a php-build-system?

If PHP can read multiple INI files (which the variable name leads me to
believe), you can add a 'native-search-path' to the PHP expression and
have each extension register an INI file in this directory.

For example:

(define-public php
[...]
    (native-search-paths
     (list (search-path-specification
            (variable "PHP_INI_SCAN_DIR")
            ;; This might not be the best place to add them.
            (files '("php/ini")))))

And then, for extensions, they should install an INI file that enables
them to $out/php/ini. When users install PHP, PHP_INI_SCAN_DIR will be
pointed towards the users' .guix-profile/php/ini directory.

Would this approach work?

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