Test and fix normalize_path_copy()

This changes the test-path-utils utility to invoke normalize_path_copy()
instead of normalize_absolute_path() because the latter is about to be
removed.

The test cases in t0060 are adjusted in two regards:

- normalize_path_copy() more often leaves a trailing slash in the result.
  This has no negative side effects because the new user of this function,
  longest_ancester_length(), already accounts for this behavior.

- The function can fail.

The tests uncover a flaw in normalize_path_copy(): If there are
sufficiently many '..' path components so that the root is reached, such as
in "/d1/s1/../../d2", then the leading slash was lost. This manifested
itself that (assuming there is a repository at /tmp/foo)

  $ git add /d1/../tmp/foo/some-file

reported 'pathspec is outside repository'. This is now fixed.

Moreover, the test case descriptions of t0060 now include the test data and
expected outcome.

Signed-off-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/test-path-utils.c b/test-path-utils.c
index 7e6fc8deaf..5168a8e3df 100644
--- a/test-path-utils.c
+++ b/test-path-utils.c
@@ -2,10 +2,11 @@
 
 int main(int argc, char **argv)
 {
-	if (argc == 3 && !strcmp(argv[1], "normalize_absolute_path")) {
+	if (argc == 3 && !strcmp(argv[1], "normalize_path_copy")) {
 		char *buf = xmalloc(PATH_MAX + 1);
-		int rv = normalize_absolute_path(buf, argv[2]);
-		assert(strlen(buf) == rv);
+		int rv = normalize_path_copy(buf, argv[2]);
+		if (rv)
+			buf = "++failed++";
 		puts(buf);
 		return 0;
 	}