Function update_sparsity

unpack-trees.c:2129–2194

* Update SKIP_WORKTREE bits according to sparsity patterns, and update * working directory to match. * * CE_NEW_SKIP_WORKTREE is used internally. */

 * CE_NEW_SKIP_WORKTREE is used internally.
 */
enum update_sparsity_result update_sparsity(struct unpack_trees_options *o,
					    struct pattern_list *pl)
{
	enum update_sparsity_result ret = UPDATE_SPARSITY_SUCCESS;
	int i;
	unsigned old_show_all_errors;
	int free_pattern_list = 0;

	old_show_all_errors = o->internal.show_all_errors;
	o->internal.show_all_errors = 1;
	index_state_init(&o->internal.result, o->src_index->repo);

	/* Sanity checks */
	if (!o->update || o->index_only || o->skip_sparse_checkout)
		BUG("update_sparsity() is for reflecting sparsity patterns in working directory");
	if (o->src_index != o->dst_index || o->fn)
		BUG("update_sparsity() called wrong");

	trace_performance_enter();

	/* If we weren't given patterns, use the recorded ones */
	if (!pl) {
		free_pattern_list = 1;
		pl = xcalloc(1, sizeof(*pl));
		populate_from_existing_patterns(o, pl);
	}
	o->internal.pl = pl;

	/* Expand sparse directories as needed */
	expand_index(o->src_index, o->internal.pl);

	/* Set NEW_SKIP_WORKTREE on existing entries. */
	mark_all_ce_unused(o->src_index);
	mark_new_skip_worktree(o->internal.pl, o->src_index, 0,
			       CE_NEW_SKIP_WORKTREE, o->verbose_update);

	/* Then loop over entries and update/remove as needed */
	ret = UPDATE_SPARSITY_SUCCESS;
	for (i = 0; i < o->src_index->cache_nr; i++) {
		struct cache_entry *ce = o->src_index->cache[i];


		if (ce_stage(ce)) {
			/* -1 because for loop will increment by 1 */
			i += warn_conflicted_path(o->src_index, i, o) - 1;
			ret = UPDATE_SPARSITY_WARNINGS;
			continue;
		}

		if (apply_sparse_checkout(o->src_index, ce, o))
			ret = UPDATE_SPARSITY_WARNINGS;
	}

	if (check_updates(o, o->src_index))
		ret = UPDATE_SPARSITY_WORKTREE_UPDATE_FAILURES;

	display_warning_msgs(o);
	o->internal.show_all_errors = old_show_all_errors;