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authorDuy Nguyen <pclouds@gmail.com>2018-08-17 18:00:39 (GMT)
committerJunio C Hamano <gitster@pobox.com>2018-08-17 19:10:37 (GMT)
commitb878579ae755e3a9d200093ced59ada3eaafb08c (patch)
treed7138412cf388250032989b8d76a7a643011773d
parentffc6fa0e396238de3a30623912980263b4f283ab (diff)
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clone: report duplicate entries on case-insensitive filesystems
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 exactly is "dirty". This patch helps the situation a bit by pointing out the problem at clone time. Even though this patch talks about case sensitivity, the patch makes no assumption about folding rules by the filesystem. It simply observes that if an entry has been already checked out at clone time when we're about to write a new path, some folding rules are behind this. In the case that we can't rely on filesystem (via inode number) to do this check, fall back to fspathcmp() which is not perfect but should not give false positives. This patch is tested with vim-colorschemes and Sublime-Gitignore repositories on a JFS partition with case insensitive support on Linux. Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
-rw-r--r--builtin/clone.c1
-rw-r--r--cache.h1
-rw-r--r--entry.c31
-rwxr-xr-xt/t5601-clone.sh8
-rw-r--r--unpack-trees.c47
-rw-r--r--unpack-trees.h1
6 files changed, 88 insertions, 1 deletions
diff --git a/builtin/clone.c b/builtin/clone.c
index 5c439f1..0702b0e 100644
--- a/builtin/clone.c
+++ b/builtin/clone.c
@@ -747,6 +747,7 @@ static int checkout(int submodule_progress)
memset(&opts, 0, sizeof opts);
opts.update = 1;
opts.merge = 1;
+ opts.clone = 1;
opts.fn = oneway_merge;
opts.verbose_update = (option_verbosity >= 0);
opts.src_index = &the_index;
diff --git a/cache.h b/cache.h
index 8b44765..6d6138f 100644
--- a/cache.h
+++ b/cache.h
@@ -1455,6 +1455,7 @@ struct checkout {
unsigned force:1,
quiet:1,
not_new:1,
+ clone:1,
refresh_cache:1;
};
#define CHECKOUT_INIT { NULL, "" }
diff --git a/entry.c b/entry.c
index b5d1d3c..8766e27 100644
--- a/entry.c
+++ b/entry.c
@@ -399,6 +399,34 @@ static int check_path(const char *path, int len, struct stat *st, int skiplen)
return lstat(path, st);
}
+static void mark_colliding_entries(const struct checkout *state,
+ struct cache_entry *ce, struct stat *st)
+{
+ int i, trust_ino = check_stat;
+
+#if defined(GIT_WINDOWS_NATIVE)
+ trust_ino = 0;
+#endif
+
+ ce->ce_flags |= CE_MATCHED;
+
+ for (i = 0; i < state->istate->cache_nr; i++) {
+ struct cache_entry *dup = state->istate->cache[i];
+
+ if (dup == ce)
+ break;
+
+ if (dup->ce_flags & (CE_MATCHED | CE_VALID | CE_SKIP_WORKTREE))
+ continue;
+
+ if ((trust_ino && dup->ce_stat_data.sd_ino == st->st_ino) ||
+ (!trust_ino && !fspathcmp(ce->name, dup->name))) {
+ dup->ce_flags |= CE_MATCHED;
+ break;
+ }
+ }
+}
+
/*
* Write the contents from ce out to the working tree.
*
@@ -455,6 +483,9 @@ int checkout_entry(struct cache_entry *ce,
return -1;
}
+ if (state->clone)
+ mark_colliding_entries(state, ce, &st);
+
/*
* We unlink the old file, to get the new one with the
* right permissions (including umask, which is nasty
diff --git a/t/t5601-clone.sh b/t/t5601-clone.sh
index 0b62037..f2eb73b 100755
--- a/t/t5601-clone.sh
+++ b/t/t5601-clone.sh
@@ -624,10 +624,16 @@ test_expect_success 'clone on case-insensitive fs' '
git hash-object -w -t tree --stdin) &&
c=$(git commit-tree -m bogus $t) &&
git update-ref refs/heads/bogus $c &&
- git clone -b bogus . bogus
+ git clone -b bogus . bogus 2>warning
)
'
+test_expect_success !MINGW,!CYGWIN,CASE_INSENSITIVE_FS 'colliding file detection' '
+ grep X icasefs/warning &&
+ grep x icasefs/warning &&
+ test_i18ngrep "the following paths have collided" icasefs/warning
+'
+
partial_clone () {
SERVER="$1" &&
URL="$2" &&
diff --git a/unpack-trees.c b/unpack-trees.c
index cd0680f..213da8b 100644
--- a/unpack-trees.c
+++ b/unpack-trees.c
@@ -345,6 +345,46 @@ static struct progress *get_progress(struct unpack_trees_options *o)
return start_delayed_progress(_("Checking out files"), total);
}
+static void setup_collided_checkout_detection(struct checkout *state,
+ struct index_state *index)
+{
+ int i;
+
+ state->clone = 1;
+ for (i = 0; i < index->cache_nr; i++)
+ index->cache[i]->ce_flags &= ~CE_MATCHED;
+}
+
+static void report_collided_checkout(struct index_state *index)
+{
+ struct string_list list = STRING_LIST_INIT_NODUP;
+ int i;
+
+ for (i = 0; i < index->cache_nr; i++) {
+ struct cache_entry *ce = index->cache[i];
+
+ if (!(ce->ce_flags & CE_MATCHED))
+ continue;
+
+ string_list_append(&list, ce->name);
+ ce->ce_flags &= ~CE_MATCHED;
+ }
+
+ list.cmp = fspathcmp;
+ string_list_sort(&list);
+
+ if (list.nr) {
+ warning(_("the following paths have collided (e.g. case-sensitive paths\n"
+ "on a case-insensitive filesystem) and only one from the same\n"
+ "colliding group is in the working tree:\n"));
+
+ for (i = 0; i < list.nr; i++)
+ fprintf(stderr, " '%s'\n", list.items[i].string);
+ }
+
+ string_list_clear(&list, 0);
+}
+
static int check_updates(struct unpack_trees_options *o)
{
unsigned cnt = 0;
@@ -359,6 +399,9 @@ static int check_updates(struct unpack_trees_options *o)
state.refresh_cache = 1;
state.istate = index;
+ if (o->clone)
+ setup_collided_checkout_detection(&state, index);
+
progress = get_progress(o);
if (o->update)
@@ -423,6 +466,10 @@ static int check_updates(struct unpack_trees_options *o)
errs |= finish_delayed_checkout(&state);
if (o->update)
git_attr_set_direction(GIT_ATTR_CHECKIN, NULL);
+
+ if (o->clone)
+ report_collided_checkout(index);
+
return errs != 0;
}
diff --git a/unpack-trees.h b/unpack-trees.h
index c2b434c..d940f1c 100644
--- a/unpack-trees.h
+++ b/unpack-trees.h
@@ -42,6 +42,7 @@ struct unpack_trees_options {
unsigned int reset,
merge,
update,
+ clone,
index_only,
nontrivial_merge,
trivial_merges_only,