Subject: [PATCH] guix: ant-build-system: Do not compress jars.

From: Ricardo Wurmus <[email-masked]>
Date: Thu, 14 Dec 2017 00:09:31 +0100

Fixes <https://bugs.gnu.org/29700>.

* guix/build/ant-build-system.scm (strip-jar-timestamps): Do not compress jar
when repacking.
---
 guix/build/ant-build-system.scm | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/guix/build/ant-build-system.scm b/guix/build/ant-build-system.scm
index a440daf05..6ce813a00 100644
--- a/guix/build/ant-build-system.scm
+++ b/guix/build/ant-build-system.scm
@@ -197,9 +197,12 @@ repack them.  This is necessary to ensure that archives are reproducible."
            ;; first.
            (with-directory-excursion dir
              (let* ((files (find-files "." ".*" #:directories? #t))
+                    ;; To ensure that the reference scanner can detect all
+                    ;; store references in the jars we disable compression
+                    ;; with the "-0" option.
                     (command (if (file-exists? manifest)
-                                 `("zip" "-X" ,jar ,manifest ,@files)
-                                 `("zip" "-X" ,jar ,@files))))
+                                 `("zip" "-0" "-X" ,jar ,manifest ,@files)
+                                 `("zip" "-0" "-X" ,jar ,@files))))
                (unless (zero? (apply system* command))
                  (error "'zip' failed"))))
            (utime jar 0 0)
-- 
2.15.0