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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013 Ludovic Courtès <ludo@gnu.org>
;;;
;;; 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 <http://www.gnu.org/licenses/>.
(define-module (guix build rpath)
#:use-module (ice-9 popen)
#:use-module (ice-9 rdelim)
#:export (%patchelf
file-rpath
augment-rpath))
;;; Commentary:
;;;
;;; Tools to manipulate the RPATH and RUNPATH of ELF binaries. Currently they
;;; rely on PatchELF.
;;;
;;; Code:
(define %patchelf
;; The `patchelf' command.
(make-parameter "patchelf"))
(define %not-colon
(char-set-complement (char-set #\:)))
(define (file-rpath file)
"Return the RPATH (or RUNPATH) of FILE as a list of directory names, or #f
on failure."
(let* ((p (open-pipe* OPEN_READ (%patchelf) "--print-rpath" file))
(l (read-line p)))
(and (zero? (close-pipe p))
(string-tokenize l %not-colon))))
(define (augment-rpath file dir)
"Add DIR to the front of the RPATH and RUNPATH of FILE. Return the new
RPATH as a list, or #f on failure."
(let* ((rpath (or (file-rpath file) '()))
(rpath* (cons dir rpath)))
(format #t "~a: changing RPATH from ~s to ~s~%"
file rpath rpath*)
(and (zero? (system* (%patchelf) "--set-rpath"
(string-join rpath* ":") file))
rpath*)))
;;; rpath.scm ends here
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