Function check_updates

unpack-trees.c:424–515

}

static int check_updates(struct unpack_trees_options *o,
			 struct index_state *index)
{
	unsigned cnt = 0;
	int errs = 0;
	struct progress *progress;
	struct checkout state = CHECKOUT_INIT;
	int i, pc_workers, pc_threshold;

	trace_performance_enter();
	state.super_prefix = o->super_prefix;
	state.force = 1;
	state.quiet = 1;
	state.refresh_cache = 1;
	state.istate = index;
	clone_checkout_metadata(&state.meta, &o->meta, NULL);

	if (!o->update || o->dry_run) {
		remove_marked_cache_entries(index, 0);
		trace_performance_leave("check_updates");
		return 0;
	}

	if (o->clone)
		setup_collided_checkout_detection(&state, index);

	progress = get_progress(o, index);

	/* Start with clean cache to avoid using any possibly outdated info. */
	invalidate_lstat_cache();

	git_attr_set_direction(GIT_ATTR_CHECKOUT);

	if (should_update_submodules())
		load_gitmodules_file(index, NULL);

	for (i = 0; i < index->cache_nr; i++) {
		const struct cache_entry *ce = index->cache[i];

		if (ce->ce_flags & CE_WT_REMOVE) {
			display_progress(progress, ++cnt);
			unlink_entry(ce, o->super_prefix);
		}
	}

	remove_marked_cache_entries(index, 0);
	remove_scheduled_dirs();

	if (should_update_submodules())
		load_gitmodules_file(index, &state);

	if (repo_has_promisor_remote(the_repository))
		/*
		 * Prefetch the objects that are to be checked out in the loop
		 * below.
		 */
		prefetch_cache_entries(index, must_checkout);