Re: Add external data to a package

[Julian Flake <julian@flake.de>]

Hi,

not really sure if this is, what you asked for, but I solved it by 
defining an additional package (let's call it "extension package" 
or "wsrt-measures") for the extension file(s), similar to what you 
already do. I would unpack the data in the extension package 
already. Then I add that extension package to the inputs of the 
package to extend. In your 'install-file lambda*, you can then 
refer to the extension file(s) via (string-append (assoc-ref 
inputs "wsrt-measures") "/path/to/file/s").

Maybe there are better ways, I'm also interested in.

Best Regards,
nutcase

On Tue, Nov 12 2024, Aristide Doussot wrote:

> Hello,
>
>     I am new to Guix and want to add data from an external 
> source to
> my package build. More precisely, I am trying to install the 
> library
> casacore and need to add data in its subdirectory
> share/casacore/data. I can download these data as tar via 
> ftp. For
> now, my code looks like this :
>
> "
> (defineWSRT_Measures
> (origin
> (method url-fetch)
> (uri "[...not sure I can disclose...]/WSRT_Measures.ztar")
> (sha256
> (base32 "1d9qlcmkpsnw8wm7sidp17iwd2d771nsgjwwp568886g5f239a8k"))
> )
> )
> (define-public casacore
> (package
> (name "casacore")
> (version "3.5.0")
> (source
> (origin
> (method git-fetch)
> (uri (git-reference
> (url "https://github.com/casacore/casacore.git")
> (recursive? #t)
> (commit "v3.5.0")))
> (file-name (git-file-name name version))
> (sha256 (base32 
> "0zw70slc3681mnadg169avjg7d3jwn1x49xn0022207blcig8g2l"))))
> (inputs
> (listfftwf fftw openblas boost gcc-toolchain git gsl lapack
> gfortran-toolchain readline flex bison cfitsio wcslib python
> python-numpy
> ))
> (build-system cmake-build-system)
> (arguments (list
> #:configure-flags #~(list"-DHELLO_WHO=Guix""-DBUILD_DYSCO=ON")
> #:build-type "Release"
> #:tests? #f;; some test are failing due to lack of data that are
>  downloable via ftp for now testing is disable
> #:parallel-build? #t;; TODO : check if it makes a difference in
>  building time
> #:phases
> #~(modify-phases %standard-phases
> (add-after 'install'install-data
> (lambda* (#:key inputs outputs #:allow-other-keys)
> (let*(
> (out (assoc-ref outputs "out"))
> (data (list-ref(find-files "/gnu/store""WSRT_Measures.ztar")0))
> (share-dir (string-append out "/share/casacore/data/"))
> )
> (mkdir-p share-dir)
> (invoke "tar""-xzf"data "-C"share-dir)
> #t))))
> ))
> (home-page "http://casacore.github.io/casacore/")
> (synopsis "")
> (description "A suite of C++ libraries for radio astronomy data
> processing.")
> (license license:gpl2+)))
>
> "
>
>
> And it seems to work but I am sure there are far better ways to 
> do
> this than my "take the first element of an overall find-files on
> /gnu/store/". Can someone teach me these better ways ?
>
> Thanks,
> Aristide Doussot