builtin/add: error out when passing untracked path with -u

When passing untracked path with -u option, it silently succeeds.
There is no error message and the exit code is zero. This is
inconsistent with other instances of git commands where the expected
argument is a known path. In those other instances, we error out when
the path is not known.

Fix this by passing a character array to add_files_to_cache() to
collect the pathspec matching information and report the error if a
pathspec does not match any cache entry. Also add a testcase to cover
this scenario.

Signed-off-by: Ghanshyam Thakkar <shyamthakkar001@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: spectre10

builtin/add.c

@@ -370,6 +370,7 @@ int cmd_add(int argc, const char **argv, const char *prefix)
 	int add_new_files;
 	int require_pathspec;
 	char *seen = NULL;
+	char *ps_matched = NULL;
 	struct lock_file lock_file = LOCK_INIT;
 
 	git_config(add_config, NULL);
@@ -549,13 +550,18 @@ int cmd_add(int argc, const char **argv, const char *prefix)
 
 	begin_odb_transaction();
 
+	ps_matched = xcalloc(pathspec.nr, 1);
 	if (add_renormalize)
 		exit_status |= renormalize_tracked_files(&pathspec, flags);
 	else
 		exit_status |= add_files_to_cache(the_repository, prefix,
-						  &pathspec, NULL,
+						  &pathspec, ps_matched,
 						  include_sparse, flags);
 
+	if (take_worktree_changes && !add_renormalize && !ignore_add_errors &&
+	    report_path_error(ps_matched, &pathspec))
+		exit(128);
+
 	if (add_new_files)
 		exit_status |= add_files(&dir, flags);
 
@@ -568,6 +574,7 @@ int cmd_add(int argc, const char **argv, const char *prefix)
 			       COMMIT_LOCK | SKIP_IF_UNCHANGED))
 		die(_("unable to write new index file"));
 
+	free(ps_matched);
 	dir_clear(&dir);
 	clear_pathspec(&pathspec);
 	return exit_status;

t/t2200-add-update.sh

@@ -65,6 +65,16 @@ test_expect_success 'update did not touch untracked files' '
 	test_must_be_empty out
 '
 
+test_expect_success 'error out when passing untracked path' '
+	git reset --hard &&
+	echo content >>baz &&
+	echo content >>top &&
+	test_must_fail git add -u baz top 2>err &&
+	test_grep -e "error: pathspec .baz. did not match any file(s) known to git" err &&
+	git diff --cached --name-only >actual &&
+	test_must_be_empty actual
+'
+
 test_expect_success 'cache tree has not been corrupted' '
 
 	git ls-files -s |