core-updates: Fix cups-minimal build failure

[Leo Famulari <leo@famulari.name>]

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Do you have any suggestions about how to make this more concise?

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From 0191e8394eedd271494b5e1e8c8eb131176440a8 Mon Sep 17 00:00:00 2001
From: Leo Famulari <leo@famulari.name>
Date: Sat, 25 Feb 2017 21:22:08 -0500
Subject: [PATCH] gnu: cups-minimal: Fix build failure in reset-gzip-timestamps
 phase.

* gnu/packages/cups.scm (cups-minimal)[arguments]: Add 'make-manpages-writable'
phase.
---
 gnu/packages/cups.scm | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/gnu/packages/cups.scm b/gnu/packages/cups.scm
index 20621e32b..ebb979c62 100644
--- a/gnu/packages/cups.scm
+++ b/gnu/packages/cups.scm
@@ -166,6 +166,23 @@ filters for the PDF-centric printing workflow introduced by OpenPrinting.")
              (substitute* "Makedefs.in"
                (("INITDIR.*=.*@INITDIR@") "INITDIR = @prefix@/@INITDIR@")
                (("/bin/sh") (which "sh")))))
+         ;; Make the compressed manpages writable so that the
+         ;; reset-gzip-timestamps phase does not error out.
+         (add-before 'reset-gzip-timestamps 'make-manpages-writable
+           (lambda* (#:key outputs #:allow-other-keys)
+             (let* ((out (assoc-ref outputs "out"))
+                    (man1 (string-append out "/share/man/man1"))
+                    (man5 (string-append out "/share/man/man5"))
+                    (man7 (string-append out "/share/man/man7"))
+                    (man8 (string-append out "/share/man/man8")))
+               (for-each (lambda (file) (chmod file #o666))
+                         (find-files man1 "\\.gz"))
+               (for-each (lambda (file) (chmod file #o666))
+                         (find-files man5 "\\.gz"))
+               (for-each (lambda (file) (chmod file #o666))
+                         (find-files man7 "\\.gz"))
+               (for-each (lambda (file) (chmod file #o666))
+                         (find-files man8 "\\.gz")))))
          (add-before 'build 'patch-tests
            (lambda _
              (substitute* "test/ippserver.c"
-- 
2.11.1


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