Function main

tools/lightning-downgrade.c:201–297

}

int main(int argc, char *argv[])
{
	char *config_filename, *base_dir, *net_dir, *rpc_filename, *wallet_dsn = NULL;
	const struct db_version *prev_version;
	size_t current, num_migrations;
	struct db *db;
	const struct db_migration *migrations;
	struct db_stmt *stmt;

	setup_locale();
	err_set_progname(argv[0]);

	minimal_config_opts(tmpctx, argc, argv, &config_filename, &base_dir,
			    &net_dir, &rpc_filename);
	opt_register_early_arg("--wallet", opt_set_talstr, NULL,
			       &wallet_dsn,
			       "Location of the wallet database.");
	opt_register_noarg("--help|-h", opt_usage_and_exit,
			   "A tool to downgrade an offline Core Lightning Node to " PREV_VERSION,
			   "Print this message.");
	opt_early_parse(argc, argv, opt_log_stderr_exit_usage);
	opt_parse(&argc, argv, opt_log_stderr_exit_usage);

	if (argc != 1)
		opt_usage_exit_fail("No arguments expected");

	if (!wallet_dsn)
		wallet_dsn = tal_fmt(tmpctx, "sqlite3://%s/lightningd.sqlite3", net_dir);

	if (path_is_file(path_join(tmpctx, base_dir,
				   tal_fmt(tmpctx, "lightningd-%s.pid",
					   chainparams->network_name)))) {
		errx(ERROR_USAGE,
		     "Lightningd PID file exists, aborting: lightningd must not be running");
	}

	migrations = get_db_migrations(&num_migrations);
	prev_version = version_db(PREV_VERSION);

	/* Do this even if the db hasn't changed. */
	if (!version_db(PREV_VERSION)->gossip_store_compatible) {
		printf("Deleting incompatible gossip_store\n");
		unlink(path_join(tmpctx, net_dir, "gossip_store"));
	}

	/* Open db, check it's the expected version */
	db = db_open(tmpctx, wallet_dsn, false, false, db_error, NULL);
	if (!db)
		err(1, "Could not open database %s", wallet_dsn);
	db->report_changes_fn = NULL;

	db_begin_transaction(db);
	db->data_version = db_data_version_get(db);
	current = db_get_version(db);

	if (current < prev_version->db_height)
		errx(ERROR_DBVERSION, "Database version %zu already less than %zu expected for %s",
		     current, prev_version->db_height, PREV_VERSION);