Function pathspec_needs_expanded_index

pathspec.c:805–895

}

int pathspec_needs_expanded_index(struct index_state *istate,
				  const struct pathspec *pathspec)
{
	unsigned int pos;
	int i, res = 0;
	char *skip_worktree_seen = NULL;

	/*
	 * If index is not sparse, no index expansion is needed.
	 */
	if (!istate->sparse_index)
		return 0;

	/*
	 * When using a magic pathspec, assume for the sake of simplicity that
	 * the index needs to be expanded to match all matchable files.
	 */
	if (pathspec->magic)
		return 1;

	for (i = 0; i < pathspec->nr; i++) {
		struct pathspec_item item = pathspec->items[i];

		/*
		 * If the pathspec item has a wildcard, the index should be expanded
		 * if the pathspec has the possibility of matching a subset of entries inside
		 * of a sparse directory (but not the entire directory).
		 *
		 * If the pathspec item is a literal path, the index only needs to be expanded
		 * if a) the pathspec isn't in the sparse checkout cone (to make sure we don't
		 * expand for in-cone files) and b) it doesn't match any sparse directories
		 * (since we can reset whole sparse directories without expanding them).
		 */
		if (item.nowildcard_len < item.len) {
			/*
			 * Special case: if the pattern is a path inside the cone
			 * followed by only wildcards, the pattern cannot match
			 * partial sparse directories, so we know we don't need to
			 * expand the index.
			 *
			 * Examples:
			 * - in-cone/foo***: doesn't need expanded index
			 * - not-in-cone/bar*: may need expanded index
			 * - **.c: may need expanded index
			 */
			if (strspn(item.original + item.nowildcard_len, "*") ==
				    (unsigned int)(item.len - item.nowildcard_len) &&
			    path_in_cone_mode_sparse_checkout(item.original, istate))
				continue;

			for (pos = 0; pos < istate->cache_nr; pos++) {
				struct cache_entry *ce = istate->cache[pos];

				if (!S_ISSPARSEDIR(ce->ce_mode))
					continue;

				/*
				 * If the pre-wildcard length is longer than the sparse