From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on dcvr.yhbt.net X-Spam-Level: X-Spam-ASN: AS31976 209.132.180.0/23 X-Spam-Status: No, score=-3.7 required=3.0 tests=AWL,BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI shortcircuit=no autolearn=ham autolearn_force=no version=3.4.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by dcvr.yhbt.net (Postfix) with ESMTP id 151001F97E for ; Sun, 7 Oct 2018 20:07:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728283AbeJHDPy (ORCPT ); Sun, 7 Oct 2018 23:15:54 -0400 Received: from mail-wr1-f54.google.com ([209.85.221.54]:34734 "EHLO mail-wr1-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726503AbeJHDPy (ORCPT ); Sun, 7 Oct 2018 23:15:54 -0400 Received: by mail-wr1-f54.google.com with SMTP id z4-v6so18585953wrb.1 for ; Sun, 07 Oct 2018 13:07:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:cc:subject:references:date:in-reply-to:message-id :user-agent:mime-version:content-transfer-encoding; bh=/XkAhKWfMc9Dkvj50N+9sYvnq0dcSq6ZNbPNZI/Ehxo=; b=kJHzFSD/1mfTinoI9RAWgoiAB1SXlBGfMOVsza42sKhagA/eOP+b+v57JBe8b6FHBv 0l+EoicIuhKCR1ktOcPteLSLBbxhCT0VbE1NX/SFA1DzUwvwcjZJBKrC2VtcU0mfuvPM CIZkjPqeWb0PV4qWwG9uFbJ9HOfRelfiB0xg6CVY9hXKI5V8n0M1FbwCdqjc0kIptPZ1 dMuKEr/o7Oyr+/nFmIKALoamjQNrW4uEHj+xkNWC2QrTMabRv0nPXAcgUgtv+uhfM2Xg PSsJAKhDM88Pw6uV1UHHwxdRyy4RocVCs3AnFZIw4pL64UhGE/TZrCovMhG+G4mX1Vh0 x3nQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:cc:subject:references:date :in-reply-to:message-id:user-agent:mime-version :content-transfer-encoding; bh=/XkAhKWfMc9Dkvj50N+9sYvnq0dcSq6ZNbPNZI/Ehxo=; b=Q2poaq1p7OSZQRoS3rbvuHs27XOogcG9P7qvzQ7YJdUKjsX+uQImU1IKxuvJGXPNWN ZvVZ2ZQJEGWBITua5q1TU3c0uFkfS8qn9r13PQ0fXHw8dxB6MtgYipgM0PtOHCCyV5Az ja44fQfjEOt+cw6erVQLqvvsSsCg5t5f3ye4QuRbvweU6oKUrXhPGHxYNxR6rvPQN4jC MzEpa0bwppESJ5rTJ4olK7SC4ECsdCg+Ilg4a1Opy4bqiNCZSuC6U+9x7umlCNmpNSM9 T56y1FY+uesg1g9tqBB5dDbwfkT0OUDWeQfnItBQ+C7qBxdP3mtsxBCNm4axW1gSg++F 9xLA== X-Gm-Message-State: ABuFfoj2/TbKSxYpgEERTigkIGxdOvjxaHZkNiBjic1TS9xfCW1fAUzn ikzZG2mDYSZUCggYPqqzcZI= X-Google-Smtp-Source: ACcGV607I0D8Vh+O6bGY/mt/SK4mEEGYTizmF+xUO+wGgCvZOCRabIyAzz5rROxB39KbHor0efdOZw== X-Received: by 2002:adf:9a84:: with SMTP id a4-v6mr13937199wrc.78.1538942848796; Sun, 07 Oct 2018 13:07:28 -0700 (PDT) Received: from localhost (112.68.155.104.bc.googleusercontent.com. [104.155.68.112]) by smtp.gmail.com with ESMTPSA id t2-v6sm13361373wrr.7.2018.10.07.13.07.27 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sun, 07 Oct 2018 13:07:28 -0700 (PDT) From: Junio C Hamano To: =?utf-8?B?w4Z2YXIgQXJuZmrDtnLDsA==?= Bjarmason Cc: Nicolas Pitre , Nix , Steven Grimm , Linus Torvalds , Git Mailing List Subject: Re: What's so special about objects/17/ ? References: <7vr6lcj2zi.fsf@gitster.siamese.dyndns.org> <20070905074206.GA31750@artemis.corp> <87odgh0zn6.fsf@hades.wkstn.nix> <46DEF1FA.4050500@midwinter.com> <877in50y7p.fsf@hades.wkstn.nix> <87k1mta9x5.fsf@evledraar.gmail.com> Date: Mon, 08 Oct 2018 05:07:27 +0900 In-Reply-To: (Junio C. Hamano's message of "Mon, 08 Oct 2018 04:46:43 +0900") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org Junio C Hamano writes: > Ævar Arnfjörð Bjarmason writes: > >> 1. We still have this check of objects/17/ in builtin/gc.c today. Why >> objects/17/ and not e.g. objects/00/ to go with other 000* magic such >> as the 0000000000000000000000000000000000000000 SHA-1?d Statistically >> it doesn't matter, but 17 seems like an odd thing to pick at random >> out of 00..ff, does it have any significance? > > ... > by general public and I do not have to explain the choice to the > general public ;-) One thing that is more important than "why not 00 but 17?" to answer is why a hardcoded number rather than a runtime random. It is for repeatability.