;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013 Nikita Karetnikov
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix. If not, see .
(define-module (wrap-program)
#:use-module (guix packages)
#:use-module (guix store)
#:use-module (srfi srfi-26)
#:export (store-location
wrap-program))
(define (store-location package output rest)
"Return a PACKAGE-related location."
(string-append (package-output (open-connection) package output)
rest))
(define (wrap-program program prefix? variable var-dir)
"Copy PROGRAM to .PROGRAM-real and make PROGRAM a wrapper."
(let* ((bin-location (store-location program "out"
(string-append "/bin"))) ; not safe
(program-name (package-name program))
(old (string-append bin-location "/" program-name))
(new (string-append bin-location "/." program-name "-real"))
(tmp (string-append bin-location "/." program-name "-tmp")))
(define (change-variable)
;; Prepend VAR-DIR to VARIABLE or return VAR-DIR.
(if prefix?
(string-append var-dir ":$" variable)
var-dir))
(copy-file old new)
(call-with-output-file
tmp
(cut format <> "#!/bin/sh~%export ~a=\"~a\"~%exec ./~a \"address@hidden"~%"
variable (change-variable) (basename new)))
(chmod tmp #o755)
(rename-file tmp old)))