From mboxrd@z Thu Jan 1 00:00:00 1970 From: Leo Famulari Subject: bug#20765: (no subject) Date: Mon, 8 Feb 2016 23:54:42 -0500 Message-ID: <20160209045442.GA29136@jasmine> References: <87zj4btfuo.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from eggs.gnu.org ([2001:4830:134:3::10]:50103) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aT0KP-00040t-UV for bug-guix@gnu.org; Mon, 08 Feb 2016 23:55:06 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aT0KM-000229-PJ for bug-guix@gnu.org; Mon, 08 Feb 2016 23:55:05 -0500 Received: from debbugs.gnu.org ([208.118.235.43]:51745) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aT0KM-00021y-0e for bug-guix@gnu.org; Mon, 08 Feb 2016 23:55:02 -0500 In-Reply-To: <87zj4btfuo.fsf@gnu.org> Sender: "Debbugs-submit" Resent-Message-ID: Content-Disposition: inline List-Id: Bug reports for GNU Guix List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-guix-bounces+gcggb-bug-guix=m.gmane.org@gnu.org Sender: bug-guix-bounces+gcggb-bug-guix=m.gmane.org@gnu.org To: 20765@debbugs.gnu.org Another reason to not compress Python eggs is that the contents of the zip archives introduce non-determinism through their timestamps. You can see it in action: $ git checkout fe17fb4a2c897fd9186f91887f5af63dd00d227a $ ./pre-inst-env guix build --rounds=2 acme If you save the output between rounds, you can use diffoscope to confirm that the differences between the rounds are the timestamps of the contents of the eggs.