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From: "Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>
To: peff@peff.net
Cc: git@vger.kernel.org, pawelparuzel95@gmail.com, pclouds@gmail.com,
	sandals@crustytoothpaste.net
Subject: [PATCH/RFC] clone: report duplicate entries on case-insensitive filesystems
Date: Mon, 30 Jul 2018 17:27:55 +0200	[thread overview]
Message-ID: <20180730152756.15012-1-pclouds@gmail.com> (raw)
In-Reply-To: <20180729092759.GA14484@sigill.intra.peff.net>

Paths that only differ in case work fine in a case-sensitive
filesystems, but if those repos are cloned in a case-insensitive one,
you'll get problems. The first thing to notice is "git status" will
never be clean with no indication what's exactly is "dirty".

This patch helps the situation a bit by pointing out the problem at
clone time. I have not suggested any way to work around or fix this
problem. But I guess we could probably have a section in
Documentation/ dedicated to this problem and point there instead of
a long advice in this warning.

Another thing we probably should do is catch in "git checkout" too,
not just "git clone" since your linux/unix colleage colleague may
accidentally add some files that your mac/windows machine is not very
happy with. But then there's another problem, once the problem is
known, we probably should stop spamming this warning at every
checkout, but how?

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 builtin/clone.c | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/builtin/clone.c b/builtin/clone.c
index 5c439f1394..32738c2737 100644
--- a/builtin/clone.c
+++ b/builtin/clone.c
@@ -711,6 +711,33 @@ static void update_head(const struct ref *our, const struct ref *remote,
 	}
 }
 
+static void find_duplicate_icase_entries(struct index_state *istate,
+					 struct string_list *dup)
+{
+	struct string_list list = STRING_LIST_INIT_NODUP;
+	int i;
+
+	for (i = 0; i < istate->cache_nr; i++)
+		string_list_append(&list, istate->cache[i]->name);
+
+	list.cmp = fspathcmp;
+	string_list_sort(&list);
+
+	for (i = 1; i < list.nr; i++) {
+		const char *cur = list.items[i].string;
+		const char *prev = list.items[i - 1].string;
+
+		if (dup->nr &&
+		    !fspathcmp(cur, dup->items[dup->nr - 1].string)) {
+			string_list_append(dup, cur);
+		} else if (!fspathcmp(cur, prev)) {
+			string_list_append(dup, prev);
+			string_list_append(dup, cur);
+		}
+	}
+	string_list_clear(&list, 0);
+}
+
 static int checkout(int submodule_progress)
 {
 	struct object_id oid;
@@ -761,6 +788,20 @@ static int checkout(int submodule_progress)
 	if (write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
 		die(_("unable to write new index file"));
 
+	if (ignore_case) {
+		struct string_list dup = STRING_LIST_INIT_DUP;
+		int i;
+
+		find_duplicate_icase_entries(&the_index, &dup);
+		if (dup.nr) {
+			warning(_("the following paths in this repository only differ in case and will\n"
+				  "cause problems because you have cloned it on an case-insensitive filesytem:\n"));
+			for (i = 0; i < dup.nr; i++)
+				fprintf(stderr, "\t%s\n", dup.items[i].string);
+		}
+		string_list_clear(&dup, 0);
+	}
+
 	err |= run_hook_le(NULL, "post-checkout", sha1_to_hex(null_sha1),
 			   oid_to_hex(&oid), "1", NULL);
 
-- 
2.18.0.656.gda699b98b3


  reply	other threads:[~2018-07-30 15:28 UTC|newest]

Thread overview: 96+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-27  9:59 Git clone and case sensitivity Paweł Paruzel
2018-07-27 20:59 ` brian m. carlson
2018-07-28  4:36   ` Duy Nguyen
2018-07-28  4:45     ` Duy Nguyen
2018-07-28  4:48       ` Jeff King
2018-07-28  5:11         ` Duy Nguyen
2018-07-28  9:48           ` Simon Ruderich
2018-07-28  9:56           ` Jeff King
2018-07-28 18:05             ` brian m. carlson
2018-07-29  5:26             ` Duy Nguyen
2018-07-29  9:28               ` Jeff King
2018-07-30 15:27                 ` Nguyễn Thái Ngọc Duy [this message]
2018-07-31 18:23                   ` [PATCH/RFC] clone: report duplicate entries on case-insensitive filesystems Torsten Bögershausen
2018-08-01 15:25                     ` Duy Nguyen
2018-07-31 18:44                   ` Elijah Newren
2018-07-31 19:12                     ` Junio C Hamano
2018-07-31 19:29                       ` Jeff King
2018-07-31 20:12                         ` Junio C Hamano
2018-07-31 20:37                           ` Jeff King
2018-07-31 20:57                             ` Junio C Hamano
2018-08-01 21:20                               ` Junio C Hamano
2018-08-02 14:43                                 ` Duy Nguyen
2018-08-02 16:27                                   ` Junio C Hamano
2018-08-02 19:06                                     ` Jeff King
2018-08-02 21:14                                       ` Junio C Hamano
2018-08-02 21:28                                         ` Jeff King
2018-08-03 18:23                                           ` Jeff Hostetler
2018-08-03 18:49                                             ` Junio C Hamano
2018-08-03 18:53                                             ` Jeff King
2018-08-05 14:01                                               ` Jeff Hostetler
2018-08-03 14:28                                   ` Torsten Bögershausen
2018-08-01 15:21                     ` Duy Nguyen
2018-07-31 19:13                   ` Junio C Hamano
2018-08-01 15:16                     ` Duy Nguyen
2018-08-07 19:01                   ` [PATCH v2] " Nguyễn Thái Ngọc Duy
2018-08-07 19:31                     ` Junio C Hamano
2018-08-08 19:48                       ` Jeff Hostetler
2018-08-08 22:31                         ` Jeff King
2018-08-09  0:41                           ` Junio C Hamano
2018-08-09 14:23                             ` Jeff King
2018-08-09 21:14                               ` Jeff Hostetler
2018-08-09 21:34                                 ` Jeff King
2018-08-09 21:40                                 ` Elijah Newren
2018-08-09 21:44                                   ` Jeff King
2018-08-09 21:53                                     ` Elijah Newren
2018-08-09 21:59                                       ` Jeff King
2018-08-09 23:05                                         ` Elijah Newren
2018-08-09 22:07                                   ` Junio C Hamano
2018-08-10 15:36                     ` [PATCH v3 0/1] clone: warn on colidding entries on checkout Nguyễn Thái Ngọc Duy
2018-08-10 15:36                       ` [PATCH v3 1/1] clone: report duplicate entries on case-insensitive filesystems Nguyễn Thái Ngọc Duy
2018-08-10 16:42                         ` Junio C Hamano
2018-08-11 10:09                         ` SZEDER Gábor
2018-08-11 13:16                           ` Duy Nguyen
2018-08-13 16:55                             ` Junio C Hamano
2018-08-13 17:12                               ` Duy Nguyen
2018-08-10 16:12                       ` [PATCH v3 0/1] clone: warn on colidding entries on checkout Junio C Hamano
2018-08-12  9:07                       ` [PATCH v4] clone: report duplicate entries on case-insensitive filesystems Nguyễn Thái Ngọc Duy
2018-08-13 15:32                         ` Jeff Hostetler
2018-08-13 17:18                         ` Junio C Hamano
2018-08-15 19:08                         ` Torsten Bögershausen
2018-08-15 19:35                           ` Duy Nguyen
2018-08-16 15:56                             ` [PATCH] config.txt: clarify core.checkStat = minimal Nguyễn Thái Ngọc Duy
2018-08-16 17:01                               ` Junio C Hamano
2018-08-16 18:19                                 ` Duy Nguyen
2018-08-16 22:29                                   ` Junio C Hamano
2018-08-17 15:26                                   ` Junio C Hamano
2018-08-17 15:29                                     ` Duy Nguyen
2018-08-15 19:38                           ` [PATCH v4] clone: report duplicate entries on case-insensitive filesystems Junio C Hamano
2018-08-16 14:03                             ` Torsten Bögershausen
2018-08-16 15:42                               ` Duy Nguyen
2018-08-16 16:23                               ` Junio C Hamano
2018-08-17 16:16                         ` [PATCH v5] " Nguyễn Thái Ngọc Duy
2018-08-17 17:20                           ` Junio C Hamano
2018-08-17 18:00                             ` Duy Nguyen
2018-08-17 19:46                           ` Torsten Bögershausen
2018-11-19  8:20                           ` Carlo Marcelo Arenas Belón
2018-11-19 12:28                             ` Torsten Bögershausen
2018-11-19 17:14                               ` Carlo Arenas
2018-11-19 18:24                                 ` Duy Nguyen
2018-11-19 21:03                                   ` Duy Nguyen
2018-11-19 21:04                                     ` Duy Nguyen
2018-11-19 21:17                                     ` Duy Nguyen
2018-11-19 23:29                                     ` Ramsay Jones
2018-11-19 23:54                                       ` Ramsay Jones
2018-11-20  1:05                                         ` Carlo Arenas
2018-11-20  2:22                                     ` Junio C Hamano
2018-11-20 16:28                                       ` [PATCH] clone: fix colliding file detection on APFS Nguyễn Thái Ngọc Duy
2018-11-20 19:20                                         ` Ramsay Jones
2018-11-20 19:35                                         ` Carlo Arenas
2018-11-20 19:38                                           ` Duy Nguyen
2018-11-22 17:59                                         ` [PATCH v1 1/1] t5601-99: Enable colliding file detection for MINGW tboegi
2018-11-22 20:16                                           ` Carlo Marcelo Arenas Belón
2018-11-23 11:24                                             ` Johannes Schindelin
2018-11-19 17:21                               ` [PATCH v5] clone: report duplicate entries on case-insensitive filesystems Ramsay Jones
2018-11-19 19:39                                 ` Carlo Arenas
2018-07-31 19:39                 ` Git clone and case sensitivity Jeff Hostetler

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