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Re: Add /usr/bin/env by default in guixsd?

From: Ludovic Courtès
Subject: Re: Add /usr/bin/env by default in guixsd?
Date: Wed, 08 Feb 2017 16:21:12 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux)


address@hidden skribis:

> address@hidden (Ludovic Courtès) writes:


>> First we need a simple ‘special-files’ service or something (for /bin/sh
>> and /usr/bin/env).
>> Then the whole battle will be about what the default should be.  I used
>> to be affiliated with the “no way!” party on this topic, but I
>> considering changing my mind.  :-)  Especially that it does not matter
>> that much, after all.
> That sounds great for me!  Thanks!

Commit 387e175492f960d7d86f34f3b2e43938fa72dbf3 adds

The default is unchanged (only /bin/sh is created) but the documentation
provides a one-liner for /usr/bin/env (see below).


 -- Scheme Variable: special-files-service-type
     This is the service that sets up “special files” such as ‘/bin/sh’;
     an instance of it is part of ‘%base-services’.

     The value associated with ‘special-files-service-type’ services
     must be a list of tuples where the first element is the “special
     file” and the second element is its target.  By default it is:

          `(("/bin/sh" ,(file-append BASH "/bin/sh")))

     If you want to add, say, ‘/usr/bin/env’ to your system, you can
     change it to:

          `(("/bin/sh" ,(file-append BASH "/bin/sh"))
            ("/usr/bin/env" ,(file-append COREUTILS "/bin/env")))

     Since this is part of ‘%base-services’, you can use
     ‘modify-services’ to customize the set of special files (*note
     ‘modify-services’: Service Reference.).  But the simple way to add
     a special file is via the ‘extra-special-file’ procedure (see

 -- Scheme Procedure: extra-special-file FILE TARGET
     Use TARGET as the “special file” FILE.

     For example, adding the following lines to the ‘services’ field of
     your operating system declaration leads to a ‘/usr/bin/env’

          (extra-special-file "/usr/bin/env"
                              (file-append coreutils "/bin/env"))

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