From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on dcvr.yhbt.net X-Spam-Level: X-Spam-ASN: AS31976 209.132.180.0/23 X-Spam-Status: No, score=-4.0 required=3.0 tests=AWL,BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI,RCVD_IN_MSPIKE_H3, RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_NONE shortcircuit=no autolearn=ham autolearn_force=no version=3.4.2 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by dcvr.yhbt.net (Postfix) with ESMTP id 903941F48A for ; Wed, 19 Feb 2020 21:39:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727400AbgBSVjd (ORCPT ); Wed, 19 Feb 2020 16:39:33 -0500 Received: from pb-smtp20.pobox.com ([173.228.157.52]:58073 "EHLO pb-smtp20.pobox.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726703AbgBSVjd (ORCPT ); Wed, 19 Feb 2020 16:39:33 -0500 Received: from pb-smtp20.pobox.com (unknown [127.0.0.1]) by pb-smtp20.pobox.com (Postfix) with ESMTP id 66777C2201; Wed, 19 Feb 2020 16:39:31 -0500 (EST) (envelope-from junio@pobox.com) DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=pobox.com; h=from:to:cc :subject:references:date:in-reply-to:message-id:mime-version :content-type; s=sasl; bh=8YV0g/7VYgrjJaNqpTz1S2wW1S0=; b=rRClDo 7HYILFmHtYqGl92NyR/TpWfeCIA5QjrQcauEIq2F0QETV+J3tt+UIhRla2npABe1 h6SInGcmNJ5yT5dLUiCm6DHM+1GiNEdt+JvPsoAYkfc6hYjmXiVYIOe2vPfugjJQ v7gBt/NMpAK7Sz6UZCD66GY8edSjuqYh2sH3I= DomainKey-Signature: a=rsa-sha1; c=nofws; d=pobox.com; h=from:to:cc :subject:references:date:in-reply-to:message-id:mime-version :content-type; q=dns; s=sasl; b=pcNMH/BPMsA3kvYmUwt1Wkc8bcdENu4m HHdhKmHQnSSYb1mnkgKeIyVL4do147xMWXQZiSNe1jIVkRMMMOSx8mWdeH5t8ln0 N20qai00tCARAhyIJk4cfPdoes9kC+bS6mXGg1BieNwI4GfI4GuHJVkl8vUro/KV 9RbWdZqZZfY= Received: from pb-smtp20.sea.icgroup.com (unknown [127.0.0.1]) by pb-smtp20.pobox.com (Postfix) with ESMTP id 5D9EEC2200; Wed, 19 Feb 2020 16:39:31 -0500 (EST) (envelope-from junio@pobox.com) Received: from pobox.com (unknown [34.76.80.147]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by pb-smtp20.pobox.com (Postfix) with ESMTPSA id 7702AC21FF; Wed, 19 Feb 2020 16:39:28 -0500 (EST) (envelope-from junio@pobox.com) From: Junio C Hamano To: Elijah Newren Cc: Elijah Newren via GitGitGadget , Git Mailing List Subject: Re: [PATCH v4 2/2] merge-recursive: fix the refresh logic in update_file_flags References: Date: Wed, 19 Feb 2020 13:39:26 -0800 In-Reply-To: (Elijah Newren's message of "Wed, 19 Feb 2020 11:32:03 -0800") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Pobox-Relay-ID: 4E5ECEA8-5360-11EA-A5E8-B0405B776F7B-77302942!pb-smtp20.pobox.com Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org Elijah Newren writes: >> Hmph, !.call_depth would avoid resetting update_wd to 0, so the only >> difference this patch makes is when the caller of this helper passed >> (update_wd == 0) during the outermost merge. We did not tell >> add_cacheinfo() to refresh, and refresh_cache_entry() was not >> called. But the new code forces refresh to happen for normal >> entries. The proposed log message explains that a refresh is needed >> for a new cache entry, but if I am reading the code correctly, this >> function is called with !update_wd from two places, one of which is >> the "Adding %s" /* do not overwrite ... */ the log message mentions. >> >> But the other one? When both sides added identically, we do have an >> up-to-date result on our side already, so shouldn't we avoid forcing >> update_wd in that case? > > This change doesn't force update_wd (write out a new file, also > implies refreshing is needed), this only forces refreshing (check > stat-related fields of existing file). > >> I do not think passing refresh==1 in that case will produce an >> incorrect result, but doesn't it force an unnecessary refreshing? >> >> Puzzled. > > It does force a refreshing, and it is a necessary one based on > merge-recursive's design. You can verify by putting an "exit 1" right > ... > So, this was a bug all along for BOTH cases, we just didn't notice before. Ah, thanks. It was just me getting a wrong impression from the proposed log message that only the other one needed refresh; if both sides need a refresh, then the change is absolutely correct. Thanks for clearing my puzzlement. Will queue.