From patchwork Sun Nov 10 12:10:11 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: shejialuo X-Patchwork-Id: 13869797 Received: from mail-pl1-f176.google.com (mail-pl1-f176.google.com [209.85.214.176]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3B37F1537C6 for ; Sun, 10 Nov 2024 12:10:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.176 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731240617; cv=none; b=MHYuuQK04BOptD55BUIpFowlrmG8tvRQLGH10jzzg7gPmt9eHFCV/x4faeTrgiQkPwrLOjAiQPhvJ94TYLafDwpoh/xcYkluw3+BLUR+HG+bslywS3PRWjlbe9GZgKTuilNknaxZKqW52ubJ3fHDIXox4Z+H3PYuDcrL5qhbYSo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731240617; c=relaxed/simple; bh=v3l23AXmSqjgLLspfCxRfg2vze3g6DwMEbd39PLxxaM=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=lALOP1zAZ6IIz+OE8w4FmLE3RiySHUk7KMU1TtUOEY799Q7A7BrSTqi4y1xAXHyPxu8hURiajngeJH+odlvCD+z0vl99nqWyhuKw9nEjB16vme0UdHWL6oEtDxgd2xjSCY9372ylkre3N9u9JIDDM6cRTaY5OAb4po6I6bm/PBo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=BnEj6vOm; arc=none smtp.client-ip=209.85.214.176 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="BnEj6vOm" Received: by mail-pl1-f176.google.com with SMTP id d9443c01a7336-20cb47387ceso38048125ad.1 for ; Sun, 10 Nov 2024 04:10:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1731240614; x=1731845414; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=q6UStGRhZm0tFNAVoRqOD92u/ksbYDovxRbLdgrDs4M=; b=BnEj6vOmCUF3VYccJGm2HBmQg9wKeL+tY7AOB97yDkyeVit2p9DmjZzSqoFpbIB6KM MHz3nZwipT1A7GuLe+moLNb/nkkFhPVskIfYW40Mtpb3vVGM1CF3xWRjfHmsEBiukWUg A6OupjmwvfQUqoyHwtQ0OQCr9f4be/dXbsfOpuHgHOY7ZFnsH9J2HL883NHjzX0Xig8f J44knBBL65sWLmYOpaxX0c5GajbFpvt926CkJZj27eIhYJDxF/KZbONpJ+Tl+wYeOWmP c+AQvaq9dvWwyXVLBRwkuC6xuaFjWDHO0CPBxXm/2b64OQEKBAd+R9znJ4e3pM+onikl h70w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1731240614; x=1731845414; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=q6UStGRhZm0tFNAVoRqOD92u/ksbYDovxRbLdgrDs4M=; b=ri4gIWR6xI70P1h0slqRGODLtb0AuLEJ4fSQp6M9O0xVFmIIo2lM5viFUaeHZLGOyX VSCEvoDtQG4Td4/oOE5CvvLAvhQNq2aOUKXZ5X2qcV67hVDHgzLJJZRLnSgJQjVO5nEx C8/ZajnSdlIwgm/HFXUo6XQOS51MANpF4QGUDEIVMclDgQVDxfr62yg5Tm85I60d03v7 dpi0z/Tg1MGoEPiK5ehyerzVBvC47AZ++DNstvQICzREEyUJbFyyXSfQUI1I8Ybkw42Q bwEYl/WLeEIPVzNzt/+ZlYIxkFMH5xq7Yz2RTrakNJejxed19pCFGAYPNVgVDwixiqlE f3JQ== X-Gm-Message-State: AOJu0YzKOrj4wv965CWvdrgSH9KvlUXcsajRscDLprVIiIMhU+iYz8V1 RrGJuiF7RXd0/i8tUu9lFVVCmDgbSrIQKyhXsJuz2ijVmDroKYVWf2upaAm6PhY= X-Google-Smtp-Source: AGHT+IG6HuIuMmjxfBQD4KUbcafDHK0C3pPqUvcwzu2sCNfp6OU4R17izRP2WVM7eujkmIHM4xEqnw== X-Received: by 2002:a17:902:db0d:b0:20c:6b11:deef with SMTP id d9443c01a7336-211835bb654mr115121255ad.48.1731240614057; Sun, 10 Nov 2024 04:10:14 -0800 (PST) Received: from localhost ([2605:52c0:1:4cf:6c5a:92ff:fe25:ceff]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-21177e59dfesm58765615ad.181.2024.11.10.04.10.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 10 Nov 2024 04:10:13 -0800 (PST) Date: Sun, 10 Nov 2024 20:10:11 +0800 From: shejialuo To: git@vger.kernel.org Cc: Patrick Steinhardt , Karthik Nayak , Junio C Hamano Subject: [PATCH v7 7/9] ref: add basic symref content check for files backend Message-ID: References: Precedence: bulk X-Mailing-List: git@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: We have code that checks regular ref contents, but we do not yet check the contents of symbolic refs. By using "parse_loose_ref_content" for symbolic refs, we will get the information of the "referent". We do not need to check the "referent" by opening the file. This is because if "referent" exists in the file system, we will eventually check its correctness by inspecting every file in the "refs" directory. If the "referent" does not exist in the filesystem, this is OK as it is seen as the dangling symref. So we just need to check the "referent" string content. A regular ref could be accepted as a textual symref if it begins with "ref:", followed by zero or more whitespaces, followed by the full refname, followed only by whitespace characters. However, we always write a single SP after "ref:" and a single LF after the refname. It may seem that we should report a fsck error message when the "referent" does not apply above rules and we should not be so aggressive because third-party reimplementations of Git may have taken advantage of the looser syntax. Put it more specific, we accept the following contents: 1. "ref: refs/heads/master " 2. "ref: refs/heads/master \n \n" 3. "ref: refs/heads/master\n\n" When introducing the regular ref content checks, we created two fsck infos "refMissingNewline" and "trailingRefContent" which exactly represents above situations. So we will reuse these two fsck messages to write checks to info the user about these situations. But we do not allow any other trailing garbage. The followings are bad symref contents which will be reported as fsck error by "git-fsck(1)". 1. "ref: refs/heads/master garbage\n" 2. "ref: refs/heads/master \n\n\n garbage " And we introduce a new "badReferentName(ERROR)" fsck message to report above errors by using "is_root_ref" and "check_refname_format" to check the "referent". Since both "is_root_ref" and "check_refname_format" don't work with whitespaces, we use the trimmed version of "referent" with these functions. In order to add checks, we will do the following things: 1. Record the untrimmed length "orig_len" and untrimmed last byte "orig_last_byte". 2. Use "strbuf_rtrim" to trim the whitespaces or newlines to make sure "is_root_ref" and "check_refname_format" won't be failed by them. 3. Use "orig_len" and "orig_last_byte" to check whether the "referent" misses '\n' at the end or it has trailing whitespaces or newlines. Mentored-by: Patrick Steinhardt Mentored-by: Karthik Nayak Signed-off-by: shejialuo --- Documentation/fsck-msgids.txt | 3 + fsck.h | 1 + refs/files-backend.c | 40 ++++++++++++ t/t0602-reffiles-fsck.sh | 111 ++++++++++++++++++++++++++++++++++ 4 files changed, 155 insertions(+) diff --git a/Documentation/fsck-msgids.txt b/Documentation/fsck-msgids.txt index 6db0eaa84a..dcea05edfc 100644 --- a/Documentation/fsck-msgids.txt +++ b/Documentation/fsck-msgids.txt @@ -28,6 +28,9 @@ `badRefName`:: (ERROR) A ref has an invalid format. +`badReferentName`:: + (ERROR) The referent name of a symref is invalid. + `badTagName`:: (INFO) A tag has an invalid format. diff --git a/fsck.h b/fsck.h index b85072df57..5227dfdef2 100644 --- a/fsck.h +++ b/fsck.h @@ -34,6 +34,7 @@ enum fsck_msg_type { FUNC(BAD_REF_CONTENT, ERROR) \ FUNC(BAD_REF_FILETYPE, ERROR) \ FUNC(BAD_REF_NAME, ERROR) \ + FUNC(BAD_REFERENT_NAME, ERROR) \ FUNC(BAD_TIMEZONE, ERROR) \ FUNC(BAD_TREE, ERROR) \ FUNC(BAD_TREE_SHA1, ERROR) \ diff --git a/refs/files-backend.c b/refs/files-backend.c index 871c8946f8..8bc7c6e0c2 100644 --- a/refs/files-backend.c +++ b/refs/files-backend.c @@ -3509,6 +3509,43 @@ typedef int (*files_fsck_refs_fn)(struct ref_store *ref_store, const char *refname, struct dir_iterator *iter); +static int files_fsck_symref_target(struct fsck_options *o, + struct fsck_ref_report *report, + struct strbuf *referent) +{ + char orig_last_byte; + size_t orig_len; + int ret = 0; + + orig_len = referent->len; + orig_last_byte = referent->buf[orig_len - 1]; + strbuf_rtrim(referent); + + if (!is_root_ref(referent->buf) && + check_refname_format(referent->buf, 0)) { + ret = fsck_report_ref(o, report, + FSCK_MSG_BAD_REFERENT_NAME, + "points to invalid refname '%s'", referent->buf); + goto out; + } + + if (referent->len == orig_len || + (referent->len < orig_len && orig_last_byte != '\n')) { + ret = fsck_report_ref(o, report, + FSCK_MSG_REF_MISSING_NEWLINE, + "misses LF at the end"); + } + + if (referent->len != orig_len && referent->len != orig_len - 1) { + ret = fsck_report_ref(o, report, + FSCK_MSG_TRAILING_REF_CONTENT, + "has trailing whitespaces or newlines"); + } + +out: + return ret; +} + static int files_fsck_refs_content(struct ref_store *ref_store, struct fsck_options *o, const char *target_name, @@ -3559,6 +3596,9 @@ static int files_fsck_refs_content(struct ref_store *ref_store, "has trailing garbage: '%s'", trailing); goto cleanup; } + } else { + ret = files_fsck_symref_target(o, &report, &referent); + goto cleanup; } cleanup: diff --git a/t/t0602-reffiles-fsck.sh b/t/t0602-reffiles-fsck.sh index 33e7a390ad..ee1e5f2864 100755 --- a/t/t0602-reffiles-fsck.sh +++ b/t/t0602-reffiles-fsck.sh @@ -263,6 +263,109 @@ test_expect_success 'regular ref content should be checked (aggregate)' ' test_cmp expect sorted_err ' +test_expect_success 'textual symref content should be checked (individual)' ' + test_when_finished "rm -rf repo" && + git init repo && + branch_dir_prefix=.git/refs/heads && + cd repo && + test_commit default && + mkdir -p "$branch_dir_prefix/a/b" && + + for good_referent in "refs/heads/branch" "HEAD" + do + printf "ref: %s\n" $good_referent >$branch_dir_prefix/branch-good && + git refs verify 2>err && + rm $branch_dir_prefix/branch-good && + test_must_be_empty err || return 1 + done && + + for bad_referent in "refs/heads/.branch" "refs/heads/~branch" "refs/heads/?branch" + do + printf "ref: %s\n" $bad_referent >$branch_dir_prefix/branch-bad && + test_must_fail git refs verify 2>err && + cat >expect <<-EOF && + error: refs/heads/branch-bad: badReferentName: points to invalid refname '\''$bad_referent'\'' + EOF + rm $branch_dir_prefix/branch-bad && + test_cmp expect err || return 1 + done && + + printf "ref: refs/heads/branch" >$branch_dir_prefix/branch-no-newline && + git refs verify 2>err && + cat >expect <<-EOF && + warning: refs/heads/branch-no-newline: refMissingNewline: misses LF at the end + EOF + rm $branch_dir_prefix/branch-no-newline && + test_cmp expect err && + + printf "ref: refs/heads/branch " >$branch_dir_prefix/a/b/branch-trailing-1 && + git refs verify 2>err && + cat >expect <<-EOF && + warning: refs/heads/a/b/branch-trailing-1: refMissingNewline: misses LF at the end + warning: refs/heads/a/b/branch-trailing-1: trailingRefContent: has trailing whitespaces or newlines + EOF + rm $branch_dir_prefix/a/b/branch-trailing-1 && + test_cmp expect err && + + printf "ref: refs/heads/branch\n\n" >$branch_dir_prefix/a/b/branch-trailing-2 && + git refs verify 2>err && + cat >expect <<-EOF && + warning: refs/heads/a/b/branch-trailing-2: trailingRefContent: has trailing whitespaces or newlines + EOF + rm $branch_dir_prefix/a/b/branch-trailing-2 && + test_cmp expect err && + + printf "ref: refs/heads/branch \n" >$branch_dir_prefix/a/b/branch-trailing-3 && + git refs verify 2>err && + cat >expect <<-EOF && + warning: refs/heads/a/b/branch-trailing-3: trailingRefContent: has trailing whitespaces or newlines + EOF + rm $branch_dir_prefix/a/b/branch-trailing-3 && + test_cmp expect err && + + printf "ref: refs/heads/branch \n " >$branch_dir_prefix/a/b/branch-complicated && + git refs verify 2>err && + cat >expect <<-EOF && + warning: refs/heads/a/b/branch-complicated: refMissingNewline: misses LF at the end + warning: refs/heads/a/b/branch-complicated: trailingRefContent: has trailing whitespaces or newlines + EOF + rm $branch_dir_prefix/a/b/branch-complicated && + test_cmp expect err +' + +test_expect_success 'textual symref content should be checked (aggregate)' ' + test_when_finished "rm -rf repo" && + git init repo && + branch_dir_prefix=.git/refs/heads && + tag_dir_prefix=.git/refs/tags && + cd repo && + test_commit default && + mkdir -p "$branch_dir_prefix/a/b" && + + printf "ref: refs/heads/branch\n" >$branch_dir_prefix/branch-good && + printf "ref: HEAD\n" >$branch_dir_prefix/branch-head && + printf "ref: refs/heads/branch" >$branch_dir_prefix/branch-no-newline-1 && + printf "ref: refs/heads/branch " >$branch_dir_prefix/a/b/branch-trailing-1 && + printf "ref: refs/heads/branch\n\n" >$branch_dir_prefix/a/b/branch-trailing-2 && + printf "ref: refs/heads/branch \n" >$branch_dir_prefix/a/b/branch-trailing-3 && + printf "ref: refs/heads/branch \n " >$branch_dir_prefix/a/b/branch-complicated && + printf "ref: refs/heads/.branch\n" >$branch_dir_prefix/branch-bad-1 && + + test_must_fail git refs verify 2>err && + cat >expect <<-EOF && + error: refs/heads/branch-bad-1: badReferentName: points to invalid refname '\''refs/heads/.branch'\'' + warning: refs/heads/a/b/branch-complicated: refMissingNewline: misses LF at the end + warning: refs/heads/a/b/branch-complicated: trailingRefContent: has trailing whitespaces or newlines + warning: refs/heads/a/b/branch-trailing-1: refMissingNewline: misses LF at the end + warning: refs/heads/a/b/branch-trailing-1: trailingRefContent: has trailing whitespaces or newlines + warning: refs/heads/a/b/branch-trailing-2: trailingRefContent: has trailing whitespaces or newlines + warning: refs/heads/a/b/branch-trailing-3: trailingRefContent: has trailing whitespaces or newlines + warning: refs/heads/branch-no-newline-1: refMissingNewline: misses LF at the end + EOF + sort err >sorted_err && + test_cmp expect sorted_err +' + test_expect_success 'ref content checks should work with worktrees' ' test_when_finished "rm -rf repo" && git init repo && @@ -313,6 +416,14 @@ test_expect_success 'ref content checks should work with worktrees' ' warning: worktrees/worktree-1/refs/worktree/branch-no-newline: refMissingNewline: misses LF at the end EOF rm $worktree1_refdir_prefix/branch-no-newline && + test_cmp expect err && + + printf "%s garbage" "$(git rev-parse HEAD)" >$worktree1_refdir_prefix/branch-garbage && + git refs verify 2>err && + cat >expect <<-EOF && + warning: worktrees/worktree-1/refs/worktree/branch-garbage: trailingRefContent: has trailing garbage: '\'' garbage'\'' + EOF + rm $worktree1_refdir_prefix/branch-garbage && test_cmp expect err '