[Reproducible-commits] [reproducible-builds-howto] 01/02: Mention PERL_HASH_SEED and PYTHONHASHSEED

[Jérémy Bobbio]

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lunar pushed a commit to branch master
in repository reproducible-builds-howto.

commit cd06eae16d66eb0d899467732001b78ad84c3a20
Author: Jérémy Bobbio <lunar at debian.org>
Date:   Tue Aug 25 15:42:35 2015 +0200

    Mention PERL_HASH_SEED and PYTHONHASHSEED
---
 reproducible-builds-howto.mdwn | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/reproducible-builds-howto.mdwn b/reproducible-builds-howto.mdwn
index f343cce..804ada3 100644
--- a/reproducible-builds-howto.mdwn
+++ b/reproducible-builds-howto.mdwn
@@ -86,6 +86,10 @@ Good:
         print MANIFEST, "$package: $deps[$packages]";
     }
 
+For Perl, it is possible to set `PERL_HASH_SEED=0` in the environment. This will result in hash keys always being in the same order. See [perlrun(1)](http://perldoc.perl.org/perlrun.html) for more information.
+
+Python users can similarily set the environment variable [PYTHONHASHSEED](https://docs.python.org/2/using/cmdline.html#envvar-PYTHONHASHSEED). When set to a given integer value, orders in dictionnaries will be the same on every run.
+
 Controlled value initialization
 -------------------------------
 

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