From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alex Kost Subject: Re: Version numbers for VCS snapshots Date: Sun, 21 Feb 2016 12:17:19 +0300 Message-ID: <87bn7axw0w.fsf@gmail.com> References: <874mem8mwx.fsf@gnu.org> <8737u344ov.fsf@elephly.net> <87twmjp2qs.fsf_-_@gnu.org> <56A063D1.80608@uq.edu.au> <20160121062251.GA25513@jasmine> <20160121184424.GB12122@jasmine> <87fuxqwsm7.fsf@gnu.org> <20160221043515.GA17164@jasmine> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Return-path: Received: from eggs.gnu.org ([2001:4830:134:3::10]:53567) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aXQ8p-0006CO-IC for guix-devel@gnu.org; Sun, 21 Feb 2016 04:17:24 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aXQ8m-0004Xw-CT for guix-devel@gnu.org; Sun, 21 Feb 2016 04:17:23 -0500 In-Reply-To: <20160221043515.GA17164@jasmine> (Leo Famulari's message of "Sat, 20 Feb 2016 23:35:15 -0500") 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: Leo Famulari Cc: guix-devel@gnu.org Leo Famulari (2016-02-21 07:35 +0300) wrote: > On Thu, Jan 21, 2016 at 10:05:36PM +0100, Ludovic Court=C3=A8s wrote: [...] >> I prefer 7! This is how Git usually truncates SHA1s, so it can=E2=80=99= t be wrong. > > I stumbled across this email earlier, which reminded me of this > discussion about hash lengths: > https://lkml.org/lkml/2010/10/28/287 > > There are currently 13 7-character hash collisions in Guix's git repo: > > $ git rev-list --objects --all | cut -c1-7 | sort | uniq -dc > 2 0d2b24c > 2 11e0632 > 2 1f3ab8d > 2 229bd6c > 2 7c4a7b7 > 2 9ff8b63 > 2 aa27b56 > 2 c10c562 > 2 d96cdce > 2 dab4329 > 2 dc27d1c > 2 ea119a2 > 2 f56cc27 Hm, when I tried "git rev-list --objects --all" I got some ridiculous number of lines (I pressed C-c C-c after about 78000 lines). Does this command really do what you wanted? (I'm sorry I didn't RTFM well enough to understand what it does). I'm not sure if the following command is correct to find such collisions, but it gives nothing (i.e., no collisions): git log --oneline | cut -c1-7 | sort | uniq -dc --=20 Alex