Version from file in a package

[Reza Housseini <reza.housseini@gmail.com>]

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Hi List

Following the excellent blog post from Ludo [1] to guixify my python 
project, I wanted to include a version string from file to have a single 
source for the guix files and also for the python pyproject.toml file.
Something along this:

(define-public my-package
   (let* ((vcs-file? (or (git-predicate %source-dir) (const #t)))
	 (version-file "VERSION")
	 (version-from-file (call-with-input-file version-file get-string-all)))
     (package
       (name "my-package")
       (version version-from-file)
       (source (local-file "../.." "my-package-checkout"
                           #:recursive? #t
                           #:select? vcs-file?))
       (build-system pyproject-build-system)
       ...

this seems to work when I build locally but throws an error when I build 
after a guix pull:

(exception system-error (value "open-file") (value "~A: ~S") (value ("No 
such file or directory" "VERSION")) (value (2)))

How can I achieve this?

Thanks for your input!

Best,
Reza

[1] 
https://guix.gnu.org/en/blog/2023/from-development-environments-to-continuous-integrationthe-ultimate-guide-to-software-development-with-guix/
-- 
Reza Housseini

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