checkout-index: ensure full index

Before we iterate over all cache entries, ensure that the index is not
sparse. This loop in checkout_all() might be safe to iterate over a
sparse index, but let's put this protection here until it can be
carefully tested.

Signed-off-by: Derrick Stolee <[email protected]>
Reviewed-by: Elijah Newren <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: derrickstolee

builtin/checkout-index.c

@@ -119,6 +119,8 @@ static void checkout_all(const char *prefix, int prefix_length)
 	int i, errs = 0;
 	struct cache_entry *last_ce = NULL;
 
+	/* TODO: audit for interaction with sparse-index. */
+	ensure_full_index(&the_index);
 	for (i = 0; i < active_nr ; i++) {
 		struct cache_entry *ce = active_cache[i];
 		if (ce_stage(ce) != checkout_stage