untracked-cache: temporarily disable with $GIT_DISABLE_UNTRACKED_CACHE

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 <redacted>
Signed-off-by: Junio C Hamano <redacted>

diff --git a/dir.c b/dir.c
index 592b5fa79567bac71ebd2c709f3712c817bc1417..2cf8f35cc789f241163ebb127183be172a517c7c 100644 (file)
--- a/dir.c
+++ b/dir.c
@@ -1801,7 +1801,7 @@ 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;
 
        /*