Add (guix build rpath).

* guix/build/rpath.scm: New file.
* Makefile.am (MODULES): Add it.
* gnu/packages/python.scm (python): Use it; remove local copy of
  the *rpath* procedures.
* gnu/packages/samba.scm (samba): Likewise.

1 files changed, 59 insertions, 0 deletions

diff --git a/guix/build/rpath.scm b/guix/build/rpath.scm
new file mode 100644
index 0000000000..75a1fef5ef
--- /dev/null
+++ b/guix/build/rpath.scm
@@ -0,0 +1,59 @@
+;;; 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