Version from file in a package

[Reza Housseini]

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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