[PATCH v3 17/23] untracked-cache: temporarily disable with $GIT_DISABLE_UNTRACKED_CACHE

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

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 <pclouds@gmail.com>
---
 dir.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dir.c b/dir.c
index 9b0e1a1..916f1ed 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;
 
 	/*
-- 
2.2.0.60.gb7b3c64