Re: Guix wiki

[Maxime Devos <maximedevos@telenet.be>]

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Attila Lendvai schreef op ma 11-04-2022 om 06:49 [+0000]:
> if someone wants to use guix as a platform for reproducible builds
> of go projects (independent of guix revisions), then a package
> definitions is needed that refers to specific versions of its
> dependencies.
> 
> currently it's not possible to open a new isolated scheme module,
> and algorithmically define/import the entire transitive closure of
> the dependencies of a go project, because they may clash in the
> package-name namespace with projects already defined elsewhere in
> guix.

Suggestion: clashing names is not a problem, as long as the final
package to build actually has an unambigious name.  Also, it is not
necessary to actually give these intermediate packages a variable name,
maybe do something like

(define-module (gnu packages ...))
(define-public foo [... a conventional guix package definition ...])

(define-module (my-reproducibility-test)
  #:use-module (gnu packages ...))

(define %version-pins ; <-- TODO: teach "guix import go --pin-versions" to produce this kind of structure?
  ;; package name / version / hash
  '(("go-github-com-operatorfoundation-shapeshifter-transports" "0.1.2" "0f1hzhk3q2fgqdg14zlg3z0s0ib1y9xwj89qnjk95b37zbgqjgsb")
    [...]))

(define pin-input
  (match-lambda
    ((label package . rest)
     (cons* label (pin package) rest))))

(define pin
  (mlambda (package)
    If the package name does not occur in %version-pins --> return package unchanged.
    Otherwise, return
    (package
      (inherit package)
      (version the new version)
      (source (origin (inherit (package-source package))
                 an appropriately adjusted commit
                 the new hash))
      ;; TODO: other versions of dependencies might need extra dependencies
      (inputs (map pin-input package))
      (native-inputs (map pin-input package))
      (propagated-inputs (map pin-input package))))

(define-public my-reproducibility-test-foo
  (package
    (inherit (pin foo))
    (name "foo-as-found-elsewhere")))

Does that suit your purposes?

Greetings,
Maxime.

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