From 3d40e3723b1bc86d22136ff01b0787809a3267a4 Mon Sep 17 00:00:00 2001
From: Elijah Newren <newren@gmail.com>
Date: Fri, 10 Sep 2021 10:29:55 +0000
Subject: stash: avoid feeding directories to update-index

When a file is removed from the cache, but there is a file of the same
name present in the working directory, we would normally treat that file
in the working directory as untracked.  However, in the case of stash,
doing that would prevent a simple 'git stash push', because the untracked
file would be in the way of restoring the deleted file.

git stash, however, blindly assumes that whatever is in the working
directory for a deleted file is wanted and passes that path along to
update-index.  That causes problems when the working directory contains
a directory with the same name as the deleted file.  Add some code for
this special case that will avoid passing directory names to
update-index.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/stash.c b/builtin/stash.c
index 8f42360..9ad2940 100644
--- a/builtin/stash.c
+++ b/builtin/stash.c
@@ -313,6 +313,17 @@ static int reset_head(void)
 	return run_command(&cp);
 }
 
+static int is_path_a_directory(const char *path)
+{
+	/*
+	 * This function differs from abspath.c:is_directory() in that
+	 * here we use lstat() instead of stat(); we do not want to
+	 * follow symbolic links here.
+	 */
+	struct stat st;
+	return (!lstat(path, &st) && S_ISDIR(st.st_mode));
+}
+
 static void add_diff_to_buf(struct diff_queue_struct *q,
 			    struct diff_options *options,
 			    void *data)
@@ -320,6 +331,9 @@ static void add_diff_to_buf(struct diff_queue_struct *q,
 	int i;
 
 	for (i = 0; i < q->nr; i++) {
+		if (is_path_a_directory(q->queue[i]->one->path))
+			continue;
+
 		strbuf_addstr(data, q->queue[i]->one->path);
 
 		/* NUL-terminate: will be fed to update-index -z */
diff --git a/t/t3903-stash.sh b/t/t3903-stash.sh
index 7346f8d..34d1ad9 100755
--- a/t/t3903-stash.sh
+++ b/t/t3903-stash.sh
@@ -1307,7 +1307,7 @@ test_expect_success 'stash -c stash.useBuiltin=false warning ' '
 	test_must_be_empty err
 '
 
-test_expect_failure 'git stash succeeds despite directory/file change' '
+test_expect_success 'git stash succeeds despite directory/file change' '
 	test_create_repo directory_file_switch_v1 &&
 	(
 		cd directory_file_switch_v1 &&
-- 
cgit v0.10.2-6-g49f6