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

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

[Hartmut Goebel]

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?

(Creating a php-build-system is too much time-consuming for me right now.)

-- 
Regards
Hartmut Goebel

| Hartmut Goebel          | h.goebel@crazy-compilers.com               |
| www.crazy-compilers.com | compilers which you thought are impossible |

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

[Marius Bakke]

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

[Hartmut Goebel]

Am 11.12.2016 um 18:41 schrieb Marius Bakke:
> If PHP can read multiple INI files (which the variable name leads me to

Yes, PHP can read multiple INI files.

> (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.

I assume, the INI files of all extension packages will be linked into
.guix-profile/php/ini. Right? So this would work.

But when building he extension, I'd expect PHP_INI_SCAN_DIR to be set in
/var/tmp/guix-build-….drv-0/environment-variables. But it isn't there.
(For building I would need the header files, not the .ini files, or
course. But this should work the same, shouldn't it?)

-- 
Regards
Hartmut Goebel

| Hartmut Goebel          | h.goebel@crazy-compilers.com               |
| www.crazy-compilers.com | compilers which you thought are impossible |