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Re: Find location of installed package in /gnu/store

From: Edouard Klein
Subject: Re: Find location of installed package in /gnu/store
Date: Sat, 15 May 2021 10:28:21 +0200
User-agent: mu4e 1.4.15; emacs 27.2

Hi !

This is where G-expressions will help you :)

Basically the path you need does not exist in the same "strata" as the
code of the package.

The following code will define a build-gexp function that evaluates a
G-expression and prints the resulting directory in the store. You can
try it in "guix repl" or with "guix build -f FILE"

A G-exp begins with #~ and withing the following expr, any piece of code
prefixed by #$ is recursively replaced by its value, but only if this
value is a primitive value (string, int,...) or a package.

If it is a package, it gets replaced by the path in the store of that

So to give a short answer, run the following into the REPL to get your
     (guix gexp)
     (guix store)
     (guix derivations)
     (gnu packages java))
    (define (build-gexp gexp)
      "Build GEXP using the local daemon."
      (let ((derivation 
             (run-with-store (open-connection)
         (list derivation))
        (derivation-output-path (assoc-ref (derivation-outputs derivation) 

 (with-imported-modules '((guix build utils))
       (use-modules (guix build utils))
       (mkdir-p  (string-append #$output "/bin"))
       (with-output-to-file (string-append #$output "/bin/")
         (lambda _
           (display (string-append "Iced tea lives at:" #$icedtea-8)))))))

This wil output a path, in my case

and in it you'll have the file:

which contains
Iced tea lives at:/gnu/store/vaqdvsqdv5mads38dp6pc5827pdgnmb3-icedtea-3.7.0

Given your stated use case, you may be interested in the following
upcoming patch:

It will let you wrap any executable in the appropriate env vars, so I
guess you will be able to do something like
#$(wrap-in-search-paths #~(string-append #$output "/bin/your-script")
(list icedtea-8))

Hopefully icedtea-8 sets the correct search paths, but I believe it



Phil Beadling writes:

> Hi,
> Given a package definition, eg icedtea-8's JDK, how can can I determine the
> location of the installed package in my /gnu/store?
> There doesn't seem to be anything on the package module itself, presumably
> because this is static data, and what I need is something to calculate the
> hash of the resulting install specific to my Guix?
> eg
> scheme@(guix-user) [3]> (package-outputs icedtea-8)
> $8 = ("out" "jdk" "doc")
> scheme@(guix-user) [3]>
> I'd like to return this location using the package name or definition as an
> input:
> /gnu/store/i3vf1a49m0abcjqza19mb4mkjmc6k60n-icedtea-3.7.0-jdk/
> The aim is to use this to derivive the JDK include directories in a generic
> way for some scripts I'm writing, such that I don't need to update them
> each time the JDK hash changes after a guix pull.
> Cheers,
> Phil.

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