08/09: doc: Mention zeroed mtimes in the binary tarball.

[Ludovic Courtès]

civodul pushed a commit to branch master
in repository guix.

commit aafa0dffb18dd404efd34dafbe586408ca6907ce
Author: Ludovic Courtès <address@hidden>
Date:   Wed Jul 22 22:52:37 2015 +0200

    doc: Mention zeroed mtimes in the binary tarball.
    
    Fixes <http://bugs.gnu.org/21111>.
    Reported by Dave Love <address@hidden>.
    
    * doc/guix.texi (Binary Installation): Add paragraph about "implausibly old
      time stamps" warning from tar.
---
 doc/guix.texi |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/doc/guix.texi b/doc/guix.texi
index a512f7d..09c7faf 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -308,6 +308,12 @@ This creates @file{/gnu/store} (@pxref{The Store}) and 
@file{/var/guix}.
 The latter contains a ready-to-use profile for @code{root} (see next
 step.)
 
+Some versions of address@hidden raise a warning about ``implausibly old
+time stamps''.  This is because all the files in the archive have their
+modification time set to zero (which means January 1st, 1970.)  This is
+done on purpose to make sure the archive content is independent of its
+creation time, thus making it reproducible.
+
 Do @emph{not} unpack the tarball on a working Guix system since that
 would overwrite its own essential files.