This can be used to double check if results with untracked cache are
correctly, compared to vanilla version. Untracked cache remains in
index, but not used.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
Signed-off-by: Junio C Hamano <gits...@pobox.com>
---
 dir.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dir.c b/dir.c
index 1c3db0b..5b9dd5d 100644
--- a/dir.c
+++ b/dir.c
@@ -1800,7 +1800,7 @@ static struct untracked_cache_dir 
*validate_untracked_cache(struct dir_struct *d
        struct untracked_cache_dir *root;
        int i;
 
-       if (!dir->untracked)
+       if (!dir->untracked || getenv("GIT_DISABLE_UNTRACKED_CACHE"))
                return NULL;
 
        /*
-- 
2.3.0.rc1.137.g477eb31

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