From patchwork Mon May 23 20:12:38 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Hostetler X-Patchwork-Id: 12859424 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B2A10C433EF for ; Mon, 23 May 2022 20:15:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232891AbiEWUPK (ORCPT ); Mon, 23 May 2022 16:15:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52358 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233097AbiEWUNv (ORCPT ); Mon, 23 May 2022 16:13:51 -0400 Received: from mail-wr1-x42e.google.com (mail-wr1-x42e.google.com [IPv6:2a00:1450:4864:20::42e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C53ACAE26E for ; Mon, 23 May 2022 13:13:24 -0700 (PDT) Received: by mail-wr1-x42e.google.com with SMTP id e2so11281027wrc.1 for ; Mon, 23 May 2022 13:13:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=message-id:in-reply-to:references:from:date:subject:fcc :content-transfer-encoding:mime-version:to:cc; bh=yAYOyrQ7lGddulrPeFKr0D/52H8sH3I2rvMs5wugd2A=; b=qDTQA5dU/LbPVweDO5gsfT9b9WW2hOkZP2E2hMOHKsDj7XI2mT9MB1seSCea6a9AVi ygWo2fsSvv6P9w38zFMI4XLIunRQKpLTZy5PfNCIh1nRKBtpQ/pOwCHj40IbDW4Wt3xV Y9rYmXC59UuWstvJVRkgTLnqVxtHRqgYOWdHCPEa3AdL0c6tU02Uqd0iGO3g75exPDk0 mL69dFOO7B5utFbkJYH4QwwR4kowtoulbZnHIxR7GEAtYdeo8dU83qLai4dfxVQ5C+Xn 35zAEzjAcVq5d3xHlvfJ5UGX0hWUhZQfY6L21UzLfy3hXXoc51vNzRd/t7Xs2oW8bmA/ vyBA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:in-reply-to:references:from:date :subject:fcc:content-transfer-encoding:mime-version:to:cc; bh=yAYOyrQ7lGddulrPeFKr0D/52H8sH3I2rvMs5wugd2A=; b=g22lKNrvIgPozM6hKcBgtiDUmn+zEXFAatR6V8wspX+RzYa+UaYT1gFe4CA+MwvhXD 72LsL9d7eBa5ikfjH//F7tvPsMu4IRVIVyEpZ53OTQ3KBcHk/cmEr+h9//SLIMVLP6uo rGHeFpxKTPHrh0BZUoYCXtY94GD2uceRCrE/SojF61APxX9LOIlLtSlZdRYI1u8pCEY4 iWQYB2haoc9Pt4dOIavrpad5gTVhsyhXpoNO/6DC5wsUCtIv719w9grAPaSQdOoj0m3i HoSrd9BdP2LPKmbuO3OGwS6lDOpbdsdhBEZXJ4y97aSAFwR4CJCkqP2KYMclP6et32z8 pnrA== X-Gm-Message-State: AOAM530MFR9fMOi//aH2zqgjHwDPzFPs5oJwhpmhS05MStHy+SjsCb7t zbmv1p146J6ozOMltQqJl2IBCKRIruM= X-Google-Smtp-Source: ABdhPJwjCjsCBbFdRdJDQwJOosh1qCod+VoJVFqY8DXsI5vWrhMOSoEU0b/TCR7zav8YkHCK8BfHTw== X-Received: by 2002:a5d:58cc:0:b0:20e:643d:e46a with SMTP id o12-20020a5d58cc000000b0020e643de46amr19673837wrf.97.1653336797629; Mon, 23 May 2022 13:13:17 -0700 (PDT) Received: from [127.0.0.1] ([13.74.141.28]) by smtp.gmail.com with ESMTPSA id d21-20020adf9b95000000b0020d06e7c16fsm10730877wrc.84.2022.05.23.13.13.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 23 May 2022 13:13:17 -0700 (PDT) Message-Id: <92f5c0d2c8b1a69aec4325ab35193fe257d481f1.1653336765.git.gitgitgadget@gmail.com> In-Reply-To: References: Date: Mon, 23 May 2022 20:12:38 +0000 Subject: [PATCH v7 23/30] fsmonitor: never set CE_FSMONITOR_VALID on submodules Fcc: Sent MIME-Version: 1.0 To: git@vger.kernel.org Cc: Jeff Hostetler , Derrick Stolee , =?utf-8?b?w4Z2YXIgQXJuZmrDtnI=?= =?utf-8?b?w7A=?= Bjarmason , Torsten =?unknown-8bit?q?B?= =?unknown-8bit?q?=C3=B6gershausen?= , rsbecker@nexbridge.com, Bagas Sanjaya , Johannes Schindelin , Jeff Hostetler , Jeff Hostetler Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org From: Jeff Hostetler From: Jeff Hostetler Never set CE_FSMONITOR_VALID on the cache-entry of submodule directories. During a client command like 'git status', we may need to recurse into each submodule to compute a status summary for the submodule. Since the purpose of the ce_flag is to let Git avoid scanning a cache-entry, setting the flag causes the recursive call to be avoided and we report incorrect (no status) for the submodule. We created an OS watch on the root directory of our working directory and we receive events for everything in the cone under it. When submodules are present inside our working directory, we receive events for both our repo (the super) and any subs within it. Since our index doesn't have any information for items within the submodules, we can't use those events. We could try to truncate the paths of those events back to the submodule boundary and mark the GITLINK as dirty, but that feels expensive since we would have to prefix compare every FS event that we receive against a list of submodule roots. And it still wouldn't be sufficient to correctly report status on the submodule, since we don't have any space in the cache-entry to cache the submodule's status (the 'SCMU' bits in porcelain V2 speak). That is, the CE_FSMONITOR_VALID bit just says that we don't need to scan/inspect it because we already know the answer -- it doesn't say that the item is clean -- and we don't have space in the cache-entry to store those answers. So we should always do the recursive scan. Therefore, we should never set the flag on GITLINK cache-entries. Signed-off-by: Jeff Hostetler --- fsmonitor.c | 2 + fsmonitor.h | 11 ++++ t/t7527-builtin-fsmonitor.sh | 111 +++++++++++++++++++++++++++++++++++ 3 files changed, 124 insertions(+) diff --git a/fsmonitor.c b/fsmonitor.c index e1229c289cf..57d6a483bee 100644 --- a/fsmonitor.c +++ b/fsmonitor.c @@ -580,6 +580,8 @@ void tweak_fsmonitor(struct index_state *istate) if (fsmonitor_enabled) { /* Mark all entries valid */ for (i = 0; i < istate->cache_nr; i++) { + if (S_ISGITLINK(istate->cache[i]->ce_mode)) + continue; istate->cache[i]->ce_flags |= CE_FSMONITOR_VALID; } diff --git a/fsmonitor.h b/fsmonitor.h index 3f41f653691..edf7ce5203b 100644 --- a/fsmonitor.h +++ b/fsmonitor.h @@ -68,6 +68,15 @@ static inline int is_fsmonitor_refreshed(const struct index_state *istate) * Set the given cache entries CE_FSMONITOR_VALID bit. This should be * called any time the cache entry has been updated to reflect the * current state of the file on disk. + * + * However, never mark submodules as valid. When commands like "git + * status" run they might need to recurse into the submodule (using a + * child process) to get a summary of the submodule state. We don't + * have (and don't want to create) the facility to translate every + * FS event that we receive and that happens to be deep inside of a + * submodule back to the submodule root, so we cannot correctly keep + * track of this bit on the gitlink directory. Therefore, we never + * set it on submodules. */ static inline void mark_fsmonitor_valid(struct index_state *istate, struct cache_entry *ce) { @@ -75,6 +84,8 @@ static inline void mark_fsmonitor_valid(struct index_state *istate, struct cache if (fsm_mode > FSMONITOR_MODE_DISABLED && !(ce->ce_flags & CE_FSMONITOR_VALID)) { + if (S_ISGITLINK(ce->ce_mode)) + return; istate->cache_changed = 1; ce->ce_flags |= CE_FSMONITOR_VALID; trace_printf_key(&trace_fsmonitor, "mark_fsmonitor_clean '%s'", ce->name); diff --git a/t/t7527-builtin-fsmonitor.sh b/t/t7527-builtin-fsmonitor.sh index 3bc335b891d..cf4fb72c3f0 100755 --- a/t/t7527-builtin-fsmonitor.sh +++ b/t/t7527-builtin-fsmonitor.sh @@ -721,4 +721,115 @@ do ' done +# Test fsmonitor interaction with submodules. +# +# If we start the daemon in the super, it will see FS events for +# everything in the working directory cone and this includes any +# files/directories contained *within* the submodules. +# +# A `git status` at top level will get events for items within the +# submodule and ignore them, since they aren't named in the index +# of the super repo. This makes the fsmonitor response a little +# noisy, but it doesn't alter the correctness of the state of the +# super-proper. +# +# When we have submodules, `git status` normally does a recursive +# status on each of the submodules and adds a summary row for any +# dirty submodules. (See the "S..." bits in porcelain V2 output.) +# +# It is therefore important that the top level status not be tricked +# by the FSMonitor response to skip those recursive calls. That is, +# even if FSMonitor says that the mtime of the submodule directory +# hasn't changed and it could be implicitly marked valid, we must +# not take that shortcut. We need to force the recusion into the +# submodule so that we get a summary of the status *within* the +# submodule. + +create_super () { + super="$1" && + + git init "$super" && + echo x >"$super/file_1" && + echo y >"$super/file_2" && + echo z >"$super/file_3" && + mkdir "$super/dir_1" && + echo a >"$super/dir_1/file_11" && + echo b >"$super/dir_1/file_12" && + mkdir "$super/dir_1/dir_2" && + echo a >"$super/dir_1/dir_2/file_21" && + echo b >"$super/dir_1/dir_2/file_22" && + git -C "$super" add . && + git -C "$super" commit -m "initial $super commit" +} + +create_sub () { + sub="$1" && + + git init "$sub" && + echo x >"$sub/file_x" && + echo y >"$sub/file_y" && + echo z >"$sub/file_z" && + mkdir "$sub/dir_x" && + echo a >"$sub/dir_x/file_a" && + echo b >"$sub/dir_x/file_b" && + mkdir "$sub/dir_x/dir_y" && + echo a >"$sub/dir_x/dir_y/file_a" && + echo b >"$sub/dir_x/dir_y/file_b" && + git -C "$sub" add . && + git -C "$sub" commit -m "initial $sub commit" +} + +my_match_and_clean () { + git -C super --no-optional-locks status --porcelain=v2 >actual.with && + git -C super --no-optional-locks -c core.fsmonitor=false \ + status --porcelain=v2 >actual.without && + test_cmp actual.with actual.without && + + git -C super/dir_1/dir_2/sub reset --hard && + git -C super/dir_1/dir_2/sub clean -d -f +} + +test_expect_success 'submodule always visited' ' + test_when_finished "git -C super fsmonitor--daemon stop; \ + rm -rf super; \ + rm -rf sub" && + + create_super super && + create_sub sub && + + git -C super submodule add ../sub ./dir_1/dir_2/sub && + git -C super commit -m "add sub" && + + start_daemon -C super && + git -C super config core.fsmonitor true && + git -C super update-index --fsmonitor && + git -C super status && + + # Now run pairs of commands w/ and w/o FSMonitor while we make + # some dirt in the submodule and confirm matching output. + + # Completely clean status. + my_match_and_clean && + + # .M S..U + echo z >super/dir_1/dir_2/sub/dir_x/dir_y/foobar_u && + my_match_and_clean && + + # .M S.M. + echo z >super/dir_1/dir_2/sub/dir_x/dir_y/foobar_m && + git -C super/dir_1/dir_2/sub add . && + my_match_and_clean && + + # .M S.M. + echo z >>super/dir_1/dir_2/sub/dir_x/dir_y/file_a && + git -C super/dir_1/dir_2/sub add . && + my_match_and_clean && + + # .M SC.. + echo z >>super/dir_1/dir_2/sub/dir_x/dir_y/file_a && + git -C super/dir_1/dir_2/sub add . && + git -C super/dir_1/dir_2/sub commit -m "SC.." && + my_match_and_clean +' + test_done