Re: package definition question: referring to source files of another package?

[Attila Lendvai <attila@lendvai.name>]

> In some scenarios package A may refer to source files in package B.

depending on where and what you need, you can do something like this in a GEXP context:

(define (upstream-file relative-path)
  (let ((git-origin
         (let ((commit "v0.13.2"))
           (origin
             (method git-fetch)
             (uri (git-reference
                   (url ...)
                   (commit commit)))
             (file-name (git-file-name "foo-bar" commit))
             (sha256
              (base32 ...))))))
    (file-append git-origin relative-path)))

#~(let ((x #$(upstream-file "/some-path"))) ...)


this way the versioning of the two packages are not tied together, which may or may not be what you want from a semantics perspective.

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• attila lendvai
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