Merge branch 'rs/fsck-duplicate-names-in-trees'

The check in "git fsck" to ensure that the tree objects are sorted
still had corner cases it missed unsorted entries.

* rs/fsck-duplicate-names-in-trees:
  fsck: detect more in-tree d/f conflicts
  t1450: demonstrate undetected in-tree d/f conflict
  t1450: increase test coverage of in-tree d/f detection
  fsck: fix a typo in a comment

Author: gitster

fsck.c

@@ -598,7 +598,7 @@ static int verify_ordered(unsigned mode1, const char *name1,
 
 	/*
 	 * There can be non-consecutive duplicates due to the implicitly
-	 * add slash, e.g.:
+	 * added slash, e.g.:
 	 *
 	 *   foo
 	 *   foo.bar
@@ -620,7 +620,7 @@ static int verify_ordered(unsigned mode1, const char *name1,
 			if (!f_name)
 				break;
 			if (!skip_prefix(name2, f_name, &p))
-				break;
+				continue;
 			if (!*p)
 				return TREE_HAS_DUPS;
 			if (is_less_than_slash(*p)) {

t/t1450-fsck.sh

@@ -257,21 +257,34 @@ test_expect_success 'tree object with duplicate entries' '
 	test_i18ngrep "error in tree .*contains duplicate file entries" out
 '
 
-test_expect_success 'tree object with dublicate names' '
-	test_when_finished "remove_object \$blob" &&
-	test_when_finished "remove_object \$tree" &&
-	test_when_finished "remove_object \$badtree" &&
-	blob=$(echo blob | git hash-object -w --stdin) &&
-	printf "100644 blob %s\t%s\n" $blob x.2 >tree &&
-	tree=$(git mktree <tree) &&
-	printf "100644 blob %s\t%s\n" $blob x.1 >badtree &&
-	printf "100644 blob %s\t%s\n" $blob x >>badtree &&
-	printf "040000 tree %s\t%s\n" $tree x >>badtree &&
-	badtree=$(git mktree <badtree) &&
-	test_must_fail git fsck 2>out &&
-	test_i18ngrep "$badtree" out &&
-	test_i18ngrep "error in tree .*contains duplicate file entries" out
-'
+check_duplicate_names () {
+	expect=$1 &&
+	shift &&
+	names=$@ &&
+	test_expect_$expect "tree object with duplicate names: $names" '
+		test_when_finished "remove_object \$blob" &&
+		test_when_finished "remove_object \$tree" &&
+		test_when_finished "remove_object \$badtree" &&
+		blob=$(echo blob | git hash-object -w --stdin) &&
+		printf "100644 blob %s\t%s\n" $blob x.2 >tree &&
+		tree=$(git mktree <tree) &&
+		for name in $names
+		do
+			case "$name" in
+			*/) printf "040000 tree %s\t%s\n" $tree "${name%/}" ;;
+			*)  printf "100644 blob %s\t%s\n" $blob "$name" ;;
+			esac
+		done >badtree &&
+		badtree=$(git mktree <badtree) &&
+		test_must_fail git fsck 2>out &&
+		test_i18ngrep "$badtree" out &&
+		test_i18ngrep "error in tree .*contains duplicate file entries" out
+	'
+}
+
+check_duplicate_names success x x.1 x/
+check_duplicate_names success x x.1.2 x.1/ x/
+check_duplicate_names success x x.1 x.1.2 x/
 
 test_expect_success 'unparseable tree object' '
 	test_oid_cache <<-\EOF &&