From patchwork Mon Sep 25 15:25:16 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christian Couder X-Patchwork-Id: 13397994 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 7A885CE7A81 for ; Mon, 25 Sep 2023 15:26:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233029AbjIYP0W (ORCPT ); Mon, 25 Sep 2023 11:26:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46776 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232882AbjIYP0C (ORCPT ); Mon, 25 Sep 2023 11:26:02 -0400 Received: from mail-ed1-x536.google.com (mail-ed1-x536.google.com [IPv6:2a00:1450:4864:20::536]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9655B10E for ; Mon, 25 Sep 2023 08:25:54 -0700 (PDT) Received: by mail-ed1-x536.google.com with SMTP id 4fb4d7f45d1cf-5230a22cfd1so7798244a12.1 for ; Mon, 25 Sep 2023 08:25:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1695655552; x=1696260352; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=cFaQb+QCw1pF7cO2nQRCLrae1O2I+zc6XjI4hP6cI3g=; b=LmUcHoL7XXS63zl3hV0RrZT02KaeUp34OKupe2+On92pAq3HZcGTMc/49511GpHLvO fa7SSsGDqtcykAGi6qqKA1Qod143GCGVhnArr1kHjv+P4TJPxwVZjOd905hSgSelpZMB 0GKFAu9kluI+QYb1EPKB6ns0v98Wp400vTW6NeEWpBmQmscBoeHn3MIcHvusVyvmJ16o TZmvdbnNnF2HpfWP7Exyof6aaQqFxxPitsmHIVmdF1Yd+YDT7RxsAtsjkWox5PY0Fb++ nR0yZbP1fm5wJSZTjVbfAnuLCIbd8kfBWpU0k8MJrrsYfhCkaeKLE0vSeCCWp2XVqOSU 4dhA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1695655552; x=1696260352; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=cFaQb+QCw1pF7cO2nQRCLrae1O2I+zc6XjI4hP6cI3g=; b=Q/ixPid42xM+vJfPPzy5uumcA/+qtabCUXYP5rQMIC+K67gHlRp3/dKvwWcUaD7ZKq uNGKh49ZtvYonss7kf/4CglChbB2AjLOlP+NQA/ediJj0Isgw2M502ppIFYXSf23dafQ bOIeCm77mYw9kjoMlBDQCYvHBezn10UQnMfwmNXleHFvF6HS/lRo4BaZD3J1GgYlVaPX /ifXo5GY+PATH+o+acjR00s4SLc+N3QUbswGoSROqUmz5ZOIQcufKycUvd+1JT0ANYcO JOaP6ion035T7ulRiyipBTVtWYtgrXtw2Wo/J/PaV2gTPU6pTI3UWFXdIE0OEYzgiOxJ 5BnQ== X-Gm-Message-State: AOJu0YwxL32uAH0wZx8unCxqApX8j3VQVCjFT6YoJeoNIfovXLkT2cYf yQan7x3SVGlF7J+YNGLsGdp5s6oDRpysXA== X-Google-Smtp-Source: AGHT+IGz1Q6TO6RBD4oR9Dmo9w+SpEESJfJJTEy+QidrHUhfkWmTxq6zThegdXjgD/d9s31ZiGN8Vg== X-Received: by 2002:a17:907:7759:b0:9ae:74d1:4b44 with SMTP id kx25-20020a170907775900b009ae74d14b44mr5839361ejc.72.1695655552206; Mon, 25 Sep 2023 08:25:52 -0700 (PDT) Received: from christian-Precision-5550.. ([2a04:cec0:105a:e25e:7421:a01e:ee4a:ba03]) by smtp.gmail.com with ESMTPSA id f1-20020a17090624c100b009ae3e6c342asm6432045ejb.111.2023.09.25.08.25.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 25 Sep 2023 08:25:51 -0700 (PDT) From: Christian Couder To: git@vger.kernel.org Cc: Junio C Hamano , John Cai , Jonathan Tan , Jonathan Nieder , Taylor Blau , Derrick Stolee , Patrick Steinhardt , Christian Couder , Christian Couder Subject: [PATCH v7 8/9] repack: implement `--filter-to` for storing filtered out objects Date: Mon, 25 Sep 2023 17:25:16 +0200 Message-ID: <20230925152517.803579-9-christian.couder@gmail.com> X-Mailer: git-send-email 2.42.0.279.g57b2ba444c In-Reply-To: <20230925152517.803579-1-christian.couder@gmail.com> References: <20230911150618.129737-1-christian.couder@gmail.com> <20230925152517.803579-1-christian.couder@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org A previous commit has implemented `git repack --filter=` to allow users to filter out some objects from the main pack and move them into a new different pack. It would be nice if this new different pack could be created in a different directory than the regular pack. This would make it possible to move large blobs into a pack on a different kind of storage, for example cheaper storage. Even in a different directory, this pack can be accessible if, for example, the Git alternates mechanism is used to point to it. In fact not using the Git alternates mechanism can corrupt a repo as the generated pack containing the filtered objects might not be accessible from the repo any more. So setting up the Git alternates mechanism should be done before using this feature if the user wants the repo to be fully usable while this feature is used. In some cases, like when a repo has just been cloned or when there is no other activity in the repo, it's Ok to setup the Git alternates mechanism afterwards though. It's also Ok to just inspect the generated packfile containing the filtered objects and then just move it into the '.git/objects/pack/' directory manually. That's why it's not necessary for this command to check that the Git alternates mechanism has been already setup. While at it, as an example to show that `--filter` and `--filter-to` work well with other options, let's also add a test to check that these options work well with `--max-pack-size`. Signed-off-by: Christian Couder --- Documentation/git-repack.txt | 11 +++++++ builtin/repack.c | 10 +++++- t/t7700-repack.sh | 62 ++++++++++++++++++++++++++++++++++++ 3 files changed, 82 insertions(+), 1 deletion(-) diff --git a/Documentation/git-repack.txt b/Documentation/git-repack.txt index 6d5bec7716..8545a32667 100644 --- a/Documentation/git-repack.txt +++ b/Documentation/git-repack.txt @@ -155,6 +155,17 @@ depth is 4095. a single packfile containing all the objects. See linkgit:git-rev-list[1] for valid `` forms. +--filter-to=:: + Write the pack containing filtered out objects to the + directory ``. Only useful with `--filter`. This can be + used for putting the pack on a separate object directory that + is accessed through the Git alternates mechanism. **WARNING:** + If the packfile containing the filtered out objects is not + accessible, the repo can become corrupt as it might not be + possible to access the objects in that packfile. See the + `objects` and `objects/info/alternates` sections of + linkgit:gitrepository-layout[5]. + -b:: --write-bitmap-index:: Write a reachability bitmap index as part of the repack. This diff --git a/builtin/repack.c b/builtin/repack.c index c7b564192f..db9277081d 100644 --- a/builtin/repack.c +++ b/builtin/repack.c @@ -977,6 +977,7 @@ int cmd_repack(int argc, const char **argv, const char *prefix) int write_midx = 0; const char *cruft_expiration = NULL; const char *expire_to = NULL; + const char *filter_to = NULL; struct option builtin_repack_options[] = { OPT_BIT('a', NULL, &pack_everything, @@ -1029,6 +1030,8 @@ int cmd_repack(int argc, const char **argv, const char *prefix) N_("write a multi-pack index of the resulting packs")), OPT_STRING(0, "expire-to", &expire_to, N_("dir"), N_("pack prefix to store a pack containing pruned objects")), + OPT_STRING(0, "filter-to", &filter_to, N_("dir"), + N_("pack prefix to store a pack containing filtered out objects")), OPT_END() }; @@ -1177,6 +1180,8 @@ int cmd_repack(int argc, const char **argv, const char *prefix) if (po_args.filter_options.choice) strvec_pushf(&cmd.args, "--filter=%s", expand_list_objects_filter_spec(&po_args.filter_options)); + else if (filter_to) + die(_("option '%s' can only be used along with '%s'"), "--filter-to", "--filter"); if (geometry.split_factor) cmd.in = -1; @@ -1265,8 +1270,11 @@ int cmd_repack(int argc, const char **argv, const char *prefix) } if (po_args.filter_options.choice) { + if (!filter_to) + filter_to = packtmp; + ret = write_filtered_pack(&po_args, - packtmp, + filter_to, find_pack_prefix(packdir, packtmp), &existing, &names); diff --git a/t/t7700-repack.sh b/t/t7700-repack.sh index 39e89445fd..48e92aa6f7 100755 --- a/t/t7700-repack.sh +++ b/t/t7700-repack.sh @@ -462,6 +462,68 @@ test_expect_success '--filter works with --pack-kept-objects and .keep packs' ' ) ' +test_expect_success '--filter-to stores filtered out objects' ' + git -C bare.git repack -a -d && + test_stdout_line_count = 1 ls bare.git/objects/pack/*.pack && + + git init --bare filtered.git && + git -C bare.git -c repack.writebitmaps=false repack -a -d \ + --filter=blob:none \ + --filter-to=../filtered.git/objects/pack/pack && + test_stdout_line_count = 1 ls bare.git/objects/pack/pack-*.pack && + test_stdout_line_count = 1 ls filtered.git/objects/pack/pack-*.pack && + + commit_pack=$(test-tool -C bare.git find-pack -c 1 HEAD) && + blob_pack=$(test-tool -C bare.git find-pack -c 0 HEAD:file1) && + blob_hash=$(git -C bare.git rev-parse HEAD:file1) && + test -n "$blob_hash" && + blob_pack=$(test-tool -C filtered.git find-pack -c 1 $blob_hash) && + + echo $(pwd)/filtered.git/objects >bare.git/objects/info/alternates && + blob_pack=$(test-tool -C bare.git find-pack -c 1 HEAD:file1) && + blob_content=$(git -C bare.git show $blob_hash) && + test "$blob_content" = "content1" +' + +test_expect_success '--filter works with --max-pack-size' ' + rm -rf filtered.git && + git init --bare filtered.git && + git init max-pack-size && + ( + cd max-pack-size && + test_commit base && + # two blobs which exceed the maximum pack size + test-tool genrandom foo 1048576 >foo && + git hash-object -w foo && + test-tool genrandom bar 1048576 >bar && + git hash-object -w bar && + git add foo bar && + git commit -m "adding foo and bar" + ) && + git clone --no-local --bare max-pack-size max-pack-size.git && + ( + cd max-pack-size.git && + git -c repack.writebitmaps=false repack -a -d --filter=blob:none \ + --max-pack-size=1M \ + --filter-to=../filtered.git/objects/pack/pack && + echo $(cd .. && pwd)/filtered.git/objects >objects/info/alternates && + + # Check that the 3 blobs are in different packfiles in filtered.git + test_stdout_line_count = 3 ls ../filtered.git/objects/pack/pack-*.pack && + test_stdout_line_count = 1 ls objects/pack/pack-*.pack && + foo_pack=$(test-tool find-pack -c 1 HEAD:foo) && + bar_pack=$(test-tool find-pack -c 1 HEAD:bar) && + base_pack=$(test-tool find-pack -c 1 HEAD:base.t) && + test "$foo_pack" != "$bar_pack" && + test "$foo_pack" != "$base_pack" && + test "$bar_pack" != "$base_pack" && + for pack in "$foo_pack" "$bar_pack" "$base_pack" + do + case "$foo_pack" in */filtered.git/objects/pack/*) true ;; *) return 1 ;; esac + done + ) +' + objdir=.git/objects midx=$objdir/pack/multi-pack-index