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[bug#33386] [PATCH 1/2] gnu: gajim: Add support for Guix packaged plugin

From: Danny Milosavljevic
Subject: [bug#33386] [PATCH 1/2] gnu: gajim: Add support for Guix packaged plugins.
Date: Mon, 19 Nov 2018 00:15:55 +0100

Hi Clément,

> I don't understand what this means.
> > I thought one can use any number of profiles - and this patch could
> > definitely pick from the wrong one.  
> What do you mean?  This patch just adds the Guix packaged plugins to the
> list of plugin dirs.

guix supports any number of profiles as one user, the ~/.guix-profile one is 
the default, you can create and select profiles at will.

You can specify any profile you want using the option "-p" to "guix package" -
also, "guix environment" will create a custom profile.

However, your patch hardcodes ~/.guix-profile which is in general not what a 
using "-p" would want.  I agree that it makes sense to search for the plugins in
the current profile, but it's not clear to me that ~/.guix-profile is always
guaranteed to BE the current profile.  Is it?

According to
fontconfig already hardcodes ~/.guix-profile and "guix environment" has a
special flag to fake it, so maybe (probably?) it's OK to use it after all.

I hope someone else can chime in - but this is what immediately caught my
eye because what's the use of all these environment variables if one
hard-codes ~/.guix-profile anyway - could have hard-coded it in all packages,

> > Why isn't the PLUGINS_USER setting enough?  
> Because it doens't know about Guix installed plugins.  It doesn't look
> in ~/.guix-profile/whatever.  Only at /gnu/store/...-gajim/something and
> ~/.local/share/gajim/something.
> > Can't it be provided via environment variables?  (set by the profile)  
> Gajim doesn't seem to support customizing plugin dirs through
> environment variables, which is why I edited its code.

In general that's OK.

> > Also, shouldn't PYTHONPATH already have been set by the profile?  For
> > me, it is set (to ~/.guix-profile/lib/python3.6/site-packages) when I
> > log in.  
> It shouldn't be in the profile if python isn't installed.

Oh, makes sense.

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