Re: simplest package definition?

[Alex Kost]

John J Foerch (2016-08-25 04:07 +0300) wrote:

> Hello Guix,
>
> What is the simplest possible package definition, to install a single
> shell script?  If possible, I would like to install it from the
> directory in which I'm developing it, and the package definition would
> also be in a file in this directory.

So you have some dir and 2 files there: "my-shell-script" and
"guix.scm", right?  If you don't care about shebang (I mean if you have
"#!/bin/sh" in the script, it will not be changed to
/gnu/store/.../bash), then you can use trivial-build-system.  So the
contents of "guix.scm" can be:

(use-modules
 (guix gexp)
 (guix packages)
 (guix build-system trivial))

(let ((script-name "my-shell-script"))
  (package
    (name script-name)
    (version "0.1")
    (source (local-file (string-append (dirname (current-filename))
                                       "/" script-name)))
    (build-system trivial-build-system)
    (arguments
     `(#:modules ((guix build utils))
       #:builder
       (begin
         (use-modules (guix build utils))
         (let* ((bin-dir  (string-append %output "/bin"))
                (bin-file (string-append bin-dir "/" ,script-name)))
           (mkdir-p bin-dir)
           (copy-file (assoc-ref %build-inputs "source") bin-file)
           (chmod bin-file #o555)))))
    (home-page #f)
    (synopsis "bla bla")
    (description "More verbose bla bla")
    (license #f)))

Use "guix build -f .../guix.scm" to build it.

If you care about shebang, I think you need to use gnu-build-system
(there is a phase that patches shebangs), but it requires removing many
phases and probably some additional tweaking.

-- 
Alex