From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andreas Enge Subject: Re: updating list of substitutes Date: Wed, 22 Apr 2015 14:24:21 +0200 Message-ID: <20150422122421.GA4739@debian.math.u-bordeaux1.fr> References: <20150421064525.GA15795@thebird.nl> <87a8y1q49z.fsf@gnu.org> <20150421084028.GB16564@thebird.nl> <20150422114635.GA24566@thebird.nl> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from eggs.gnu.org ([2001:4830:134:3::10]:49387) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Ykthe-00020s-Fj for guix-devel@gnu.org; Wed, 22 Apr 2015 08:24:31 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Ykthd-0000Go-I6 for guix-devel@gnu.org; Wed, 22 Apr 2015 08:24:30 -0400 Content-Disposition: inline In-Reply-To: <20150422114635.GA24566@thebird.nl> List-Id: "Development of GNU Guix and the GNU System distribution." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org Sender: guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org To: Pjotr Prins Cc: guix-devel@gnu.org On Wed, Apr 22, 2015 at 01:46:35PM +0200, Pjotr Prins wrote: > 5. We reload the list of substitutes after a fixed time > Let me rephrase. Can we have a more lazy approach towards fetching > substitutes? Rather than a fixed TTL we could fetch the latest list on > the first failed substitute. A while ago, the list of substitutes was downloaded even when removing packages from a profile, which Ludovic fixed if I remember correctly. But even when installing, one may not need to download anything if the package is already in the store. So I think the following would be good: Determine the list of packages to be installed in a profile with "guix package" or to be built with "guix build". If they are all in the store, fine, otherwise, check the age of the list of substitutes and if it is to old, download it again. Andreas