50/155: gnu: sane-backends: Remove timestamps from the output.

[John Darrington]

jmd pushed a commit to branch wip-installer
in repository guix.

commit a24a41d5a932a3b5a759efc66684791eda3f001b
Author: Ludovic Courtès <l...@gnu.org>
Date:   Sat Dec 17 23:10:32 2016 +0100

    gnu: sane-backends: Remove timestamps from the output.
    
    * gnu/packages/scanner.scm (sane-backends-minimal)[source](modules, 
snippet):
    New fields.
---
 gnu/packages/scanner.scm |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/gnu/packages/scanner.scm b/gnu/packages/scanner.scm
index fdad1c4..7bdbf35 100644
--- a/gnu/packages/scanner.scm
+++ b/gnu/packages/scanner.scm
@@ -39,7 +39,14 @@
                    "sane-backends-" version ".tar.gz"))
              (sha256
               (base32
-               "0b3fvhrxl4l82bf3v0j47ypjv6a0k5lqbgknrq1agpmjca6vmmx4"))))
+               "0b3fvhrxl4l82bf3v0j47ypjv6a0k5lqbgknrq1agpmjca6vmmx4"))
+             (modules '((guix build utils)))
+             (snippet
+              ;; Generated HTML files and udev rules normally embed a
+              ;; timestamp.  Work around that to build things reproducibly.
+              '(substitute* "tools/sane-desc.c"
+                 (("asctime \\(localtime \\(&current_time\\)\\)")
+                  "\"1970-01-01\"")))))
     (build-system gnu-build-system)
     (native-inputs
      `(("pkg-config" ,pkg-config)))