Inject custom search specification into profile

Inject custom search specification into profile

[Zhu Zihao]

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Hi, Guix users!

Recently, I read Guix cookbook and wanna separate some of my packages
into a dedicated profile.

For example, I wanna put match-theme under
~/.guix-profiles.d/theme/theme. and source
~/.guix-profiles.d/theme/theme/etc/profile in ~/.profile.

But my XFCE still unable to find matcha theme. Because there's no
XDG_DATA_DIRS definition in <path to theme profile>/etc/profile.

So, the question is, how to inject a search path specification into a
profile? I may add something like qtbase or glib to add XDG_DATA_DIRS
spec. But it's too heavy, maybe I can add a pseudo package only contains
search path spec to profile?


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Zihao

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Re: Inject custom search specification into profile

[Zhu Zihao]

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Here's what currently I do

(use-modules (guix packages)
             (guix build-system trivial)
             (guix search-paths)
             (guix profile))

(define (search-paths-placeholder specs)
  (package
    (name "search-paths-placeholder")
    (version "0.0")
    (source #f)
    (build-system trivial-build-system)
    (arguments '(#:builder (begin (mkdir %output #t))))
    (synopsis #f)
    (description #f)
    (home-page #f)
    (native-search-paths specs)
    (license #f)))

And add this placeholder to manifest. Does Guix provide a better way to
achieve such goal?

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Zihao

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Re: Inject custom search specification into profile

[Pierre Neidhardt]

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Hi!

The trick is that etc/profile exports environment variables for the
packages that explicitly consume them, not for packages that are
consumed by others.

I don't know about Xfce, so I'll give you an example with pkg-config: if
you install just webkitgtk to a profile, its lib/pkgconfig/*.pc files
won't be detected by a `pkg-config` executable (that comes from a
different profile).  If you include `pkg-config` itself in the profile,
then the profile *.pc files will be found.

I suppose that for Xfce you need to install a component that looks up
XDG_DATA_DIRS.

Hope that helps!

-- 
Pierre Neidhardt
https://ambrevar.xyz/

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