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From: Jeff King <peff@peff.net>
To: git@vger.kernel.org
Cc: Jonathan Nieder <jrnieder@gmail.com>
Subject: [PATCH v2 8/8] fsck: complain when .gitattributes or .gitignore is a symlink
Date: Mon, 5 Oct 2020 08:16:48 -0400	[thread overview]
Message-ID: <20201005121648.GH2907394@coredump.intra.peff.net> (raw)
In-Reply-To: <20201005121609.GA2907272@coredump.intra.peff.net>

The previous commit made it impossible to have a symlinked
.gitattributes or .gitignore file via verify_path(). Let's add the same
check to fsck, which matches how we handle .gitmodules symlinks, via
b7b1fca175 (fsck: complain when .gitmodules is a symlink, 2018-05-04).

Note that we won't add these to the existing gitmodules block. The logic
for gitmodules is a bit more complicated, as we also check the content
of non-symlink instances we find. But for these new files, there is no
content check; we're just looking at the name and mode of the tree entry
(and we can avoid even the complicated name checks in the common case
that the mode doesn't indicate a symlink).

We can reuse the test helper function we defined for .gitmodules,
though (and this covers the verify_path() change from the previous
commit, as well).

Signed-off-by: Jeff King <peff@peff.net>
---
 fsck.c                       | 15 +++++++++++++++
 t/t7450-bad-dotgitx-files.sh |  8 ++++++++
 2 files changed, 23 insertions(+)

diff --git a/fsck.c b/fsck.c
index 024810139b..fcd3f268b1 100644
--- a/fsck.c
+++ b/fsck.c
@@ -67,6 +67,8 @@ static struct oidset gitmodules_done = OIDSET_INIT;
 	FUNC(GITMODULES_URL, ERROR) \
 	FUNC(GITMODULES_PATH, ERROR) \
 	FUNC(GITMODULES_UPDATE, ERROR) \
+	FUNC(GITIGNORE_SYMLINK, ERROR) \
+	FUNC(GITATTRIBUTES_SYMLINK, ERROR) \
 	/* warnings */ \
 	FUNC(BAD_FILEMODE, WARN) \
 	FUNC(EMPTY_NAME, WARN) \
@@ -688,6 +690,19 @@ static int fsck_tree(const struct object_id *tree_oid,
 						 ".gitmodules is a symbolic link");
 		}
 
+		if (S_ISLNK(mode)) {
+			if (is_hfs_dotgitignore(name) ||
+			    is_ntfs_dotgitignore(name))
+				retval += report(options, tree_oid, OBJ_TREE,
+						 FSCK_MSG_GITIGNORE_SYMLINK,
+						 ".gitignore is a symlink");
+			if (is_hfs_dotgitattributes(name) ||
+			    is_ntfs_dotgitattributes(name))
+				retval += report(options, tree_oid, OBJ_TREE,
+						 FSCK_MSG_GITATTRIBUTES_SYMLINK,
+						 ".gitattributes is a symlink");
+		}
+
 		if ((backslash = strchr(name, '\\'))) {
 			while (backslash) {
 				backslash++;
diff --git a/t/t7450-bad-dotgitx-files.sh b/t/t7450-bad-dotgitx-files.sh
index 0cd0f71c39..326b34e167 100755
--- a/t/t7450-bad-dotgitx-files.sh
+++ b/t/t7450-bad-dotgitx-files.sh
@@ -193,6 +193,14 @@ check_forbidden_symlink gitmodules vanilla .gitmodules
 check_forbidden_symlink gitmodules ntfs ".gitmodules ."
 check_forbidden_symlink gitmodules hfs ".${u200c}gitmodules"
 
+check_forbidden_symlink gitattributes vanilla .gitattributes
+check_forbidden_symlink gitattributes ntfs ".gitattributes ."
+check_forbidden_symlink gitattributes hfs ".${u200c}gitattributes"
+
+check_forbidden_symlink gitignore vanilla .gitignore
+check_forbidden_symlink gitignore ntfs ".gitignore ."
+check_forbidden_symlink gitignore hfs ".${u200c}gitignore"
+
 test_expect_success 'fsck detects non-blob .gitmodules' '
 	git init non-blob &&
 	(
-- 
2.28.0.1295.gf70bcb366f

  parent reply	other threads:[~2020-10-05 12:17 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-05  7:17 [PATCH 0/7] forbidding symlinked .gitattributes and .gitignore Jeff King
2020-10-05  7:19 ` [PATCH 1/7] fsck_tree(): fix shadowed variable Jeff King
2020-10-05  7:44   ` Jonathan Nieder
2020-10-05  8:20     ` Jeff King
2020-10-05  8:29       ` Jonathan Nieder
2020-10-05  7:19 ` [PATCH 2/7] fsck_tree(): wrap some long lines Jeff King
2020-10-05  7:46   ` Jonathan Nieder
2020-10-05  7:19 ` [PATCH 3/7] t7415: rename to expand scope Jeff King
2020-10-05  7:50   ` Jonathan Nieder
2020-10-05  8:24     ` Jeff King
2020-10-05  8:34       ` Jonathan Nieder
2020-10-05  8:49         ` Jeff King
2020-10-05  7:20 ` [PATCH 4/7] t7450: test verify_path() handling of gitmodules Jeff King
2020-10-05  7:53   ` Jonathan Nieder
2020-10-05  8:30     ` Jeff King
2020-10-05  8:38       ` Jonathan Nieder
2020-10-05  7:21 ` [PATCH 5/7] t0060: test obscured .gitattributes and .gitignore matching Jeff King
2020-10-05  8:03   ` Jonathan Nieder
2020-10-05  8:40     ` Jeff King
2020-10-05 21:20       ` Johannes Schindelin
2020-10-06 14:01         ` Jeff King
2020-10-05  7:24 ` [PATCH 6/7] verify_path(): disallow symlinks in .gitattributes and .gitignore Jeff King
2020-10-05  8:09   ` Jonathan Nieder
2020-10-05 12:07     ` Jeff King
2020-10-05  7:25 ` [PATCH 7/7] fsck: complain when .gitattributes or .gitignore is a symlink Jeff King
2020-10-05  8:12   ` Jonathan Nieder
2020-10-05  8:53     ` Jeff King
2020-10-05  7:32 ` [PATCH 0/7] forbidding symlinked .gitattributes and .gitignore Jonathan Nieder
2020-10-05  8:58   ` Jeff King
2020-10-05 12:16 ` [PATCH v2 0/8] " Jeff King
2020-10-05 12:16   ` [PATCH v2 1/8] fsck_tree(): fix shadowed variable Jeff King
2020-10-05 12:16   ` [PATCH v2 2/8] fsck_tree(): wrap some long lines Jeff King
2020-10-05 12:16   ` [PATCH v2 3/8] t7415: rename to expand scope Jeff King
2020-10-05 12:16   ` [PATCH v2 4/8] t7450: test verify_path() handling of gitmodules Jeff King
2020-10-05 12:16   ` [PATCH v2 5/8] t7450: test .gitmodules symlink matching against obscured names Jeff King
2020-10-05 12:16   ` [PATCH v2 6/8] t0060: test obscured .gitattributes and .gitignore matching Jeff King
2020-10-05 12:16   ` [PATCH v2 7/8] verify_path(): disallow symlinks in .gitattributes and .gitignore Jeff King
2020-10-27  3:35     ` Jonathan Nieder
2020-10-27  7:58       ` Jeff King
2020-10-27 22:00         ` Junio C Hamano
2020-10-28  9:41           ` Jeff King
2020-10-27 23:43         ` Jonathan Nieder
2020-10-28 19:18           ` Junio C Hamano
2020-10-05 12:16   ` Jeff King [this message]
2020-10-06 20:41   ` [PATCH v2 0/8] forbidding symlinked " Junio C Hamano
2020-10-20 23:19   ` Philip Oakley
2020-10-23  8:17     ` [PATCH] documentation symlink restrictions for .git* files Jeff King
2020-10-23  8:27       ` Jeff King
2020-10-26 22:18       ` Philip Oakley
2020-10-26 22:53         ` Jeff King
2020-10-26 23:32           ` Junio C Hamano
2020-10-27  7:26             ` Jeff King
2020-10-27 18:45               ` Junio C Hamano
2020-10-27 21:00                 ` Philip Oakley
2020-10-28 19:14                   ` Junio C Hamano

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