gnu: Add exfat-utils.

* gnu/packages/mtools.scm (exfat-utils): New variable.

gnu/packages/mtools.scm

@@ -1,5 +1,6 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2013 John Darrington <jmd@gnu.org>
+;;; Copyright © 2015 Ludovic Courtès <ludo@gnu.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -20,7 +21,8 @@
   #:use-module (guix licenses)
   #:use-module (guix packages)
   #:use-module (guix download)
-  #:use-module (guix build-system gnu))
+  #:use-module (guix build-system gnu)
+  #:use-module (gnu packages python))
 
 (define-public mtools
   (package
@@ -43,3 +45,56 @@ or Unix system.  It supports long file names and multiple disk formats.  It
 also supports some FAT-specific features such as volume labels and
 FAT-specific file attributes.")
     (license gpl3+)))
+
+(define-public exfat-utils
+  (package
+    (name "exfat-utils")
+    (version "1.1.1")
+    (source (origin
+              (method url-fetch)
+              (uri "https://docs.google.com/uc?export=download&\
+id=0B7CLI-REKbE3UzNtSkRvdHBpdjQ")
+              (sha256
+               (base32
+                "0ck2snhlhp965bb9a4y1g2lpl979sw1yznm79wbavyv174458i66"))
+              (file-name (string-append name "-" version ".tar.gz"))))
+    (build-system gnu-build-system)
+    (native-inputs `(("scons" ,scons)))
+    (arguments
+     '(#:tests? #f                                ;no test suite
+       #:phases (modify-phases %standard-phases
+                  (delete 'configure)
+                  (add-after 'unpack 'scons-propagate-environment
+                             (lambda _
+                               ;; Modify the SConstruct file to arrange for
+                               ;; environment variables to be propagated.
+                               (substitute* "SConstruct"
+                                 (("^env = Environment\\(")
+                                  "env = Environment(ENV=os.environ, "))))
+                  (replace 'build
+                           (lambda _
+                             (zero? (system* "scons"))))
+                  (replace 'install
+                           (lambda* (#:key outputs #:allow-other-keys)
+                             (let* ((out  (assoc-ref outputs "out"))
+                                    (bin  (string-append out "/bin"))
+                                    (man8 (string-append out
+                                                         "/share/man/man8")))
+                               (mkdir-p bin)
+                               (mkdir-p man8)
+                               (for-each (lambda (file)
+                                           (copy-file
+                                            file
+                                            (string-append man8 "/"
+                                                           (basename file))))
+                                         (find-files "." "\\.8$"))
+                               (zero? (system* "scons" "install"
+                                               (string-append "DESTDIR="
+                                                              bin)))))))))
+    (home-page "https://code.google.com/p/exfat")
+    (synopsis "Utilities to manipulate exFAT file systems")
+    (description
+     "This package provides an implementation of the exFAT file system,
+including command-line tools to validate exFAT file systems and to create new
+ones.")
+    (license gpl2+)))