bug#31210: Perl graft breakage

[Marius Bakke <mbakke@fastmail.com>]

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Mark H Weaver <mhw@netris.org> writes:

> Hi Leo,
>
> One more thing:
>
> Leo Famulari <leo@famulari.name> writes:
>> +           (add-after 'install 'workaround-grafting-version-bug
>> +             (lambda* (#:key outputs #:allow-other-keys)
>> +               (let* ((out (assoc-ref outputs "out"))
>> +                      (new (string-append out "/lib/perl5/5.26.2"))
>> +                      (old (string-append out "/lib/perl5/5.26.1")))
>> +                 (symlink new old)
>> +                 #t)))))))))
>
> It would be better for 'new' to be simply "5.26.2" instead of an
> absolute file name.  If I'm not mistaken, on ext4, files (including
> symlinks) smaller than 60 bytes are stored entirely within the inode,
> saving both a disk block and a seek operation when accessing it.

Hello Mark and Leo,

I'm sorry for not testing this graft more thoroughly.  And thanks for
the explanation about package/inherit, I had misunderstood its purpose.

The attached patch should address all concerns.  I have also tested
urxvt with it.


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From 44ae580e4affc03bcfd6d27277ea78aa63021fb9 Mon Sep 17 00:00:00 2001
From: Marius Bakke <mbakke@fastmail.com>
Date: Thu, 19 Apr 2018 17:17:54 +0200
Subject: [PATCH] gnu: perl: Fix grafting error due to version number in Perl
 library path.

Fixes <https://bugs.gnu.org/31210>.

* gnu/packages/perl.scm (perl-5.26.2): Use (package (inherit) ...) instead
of (package/inherit ...).
[arguments]: Add phase 'workaround-grafting-version-bug'.
---
 gnu/packages/perl.scm | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/gnu/packages/perl.scm b/gnu/packages/perl.scm
index aaf3e2e82..4cd5bf6df 100644
--- a/gnu/packages/perl.scm
+++ b/gnu/packages/perl.scm
@@ -44,6 +44,7 @@
   #:use-module (guix download)
   #:use-module (guix build-system gnu)
   #:use-module (guix build-system perl)
+  #:use-module (guix utils) ;substitute-keyword-arguments for perl-5.26.2
   #:use-module (gnu packages base)
   #:use-module (gnu packages compression)
   #:use-module (gnu packages freedesktop)
@@ -161,7 +162,8 @@
 ;; Fixes CVE-2018-6797, CVE-2018-6798, and CVE-2018-6913.
 ;; See <https://metacpan.org/changes/release/SHAY/perl-5.26.2>.
 (define-public perl-5.26.2
-  (package/inherit perl
+  (package
+    (inherit perl)
     (version "5.26.2")
     (source (origin
               (inherit (package-source perl))
@@ -169,7 +171,19 @@
                                   version ".tar.gz"))
               (sha256
                (base32
-                "03gpnxx1g6hvlh0v4aqx00580h787sfywp1vlvw64q2xcbm9qbsp"))))))
+                "03gpnxx1g6hvlh0v4aqx00580h787sfywp1vlvw64q2xcbm9qbsp"))))
+    (arguments
+     (substitute-keyword-arguments (package-arguments perl)
+       ((#:phases phases)
+        `(modify-phases ,phases
+           ;; The path to libperl.so includes the Perl version number, and this
+           ;; is not handled by grafting. See <https://bugs.gnu.org/31210>.
+           (add-after 'install 'workaround-grafting-version-bug
+             (lambda* (#:key outputs #:allow-other-keys)
+               (let* ((out (assoc-ref outputs "out")))
+                 (with-directory-excursion (string-append out "/lib/perl5")
+                   (symlink "5.26.2" "5.26.1")
+                   #t))))))))))
 
 (define-public perl-algorithm-c3
   (package
-- 
2.17.0


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