Function WriteRecoveryConfig

src/fe_utils/recovery_gen.c:119–161

* Write the configuration file in the directory specified in target_dir, * with the contents already collected in memory appended. Then write * the signal file into the target_dir. If the server does not support * recovery parameters as GUCs, the signal file is not necessary, and * configuration is written to recovery.conf. */

 * configuration is written to recovery.conf.
 */
void
WriteRecoveryConfig(PGconn *pgconn, char *target_dir, PQExpBuffer contents)
{
	char		filename[MAXPGPATH];
	FILE	   *cf;
	bool		use_recovery_conf;

	Assert(pgconn != NULL);

	use_recovery_conf =
		PQserverVersion(pgconn) < MINIMUM_VERSION_FOR_RECOVERY_GUC;

	snprintf(filename, MAXPGPATH, "%s/%s", target_dir,
			 use_recovery_conf ? "recovery.conf" : "postgresql.auto.conf");

	cf = fopen(filename, use_recovery_conf ? "w" : "a");
	if (cf == NULL)
	{
		pg_log_error("could not open file \"%s\": %m", filename);
		exit(1);
	}

	if (fwrite(contents->data, contents->len, 1, cf) != 1)
	{
		pg_log_error("could not write to file \"%s\": %m", filename);
		exit(1);
	}

	fclose(cf);

	if (!use_recovery_conf)
	{
		snprintf(filename, MAXPGPATH, "%s/%s", target_dir, "standby.signal");
		cf = fopen(filename, "w");
		if (cf == NULL)
		{
			pg_log_error("could not create file \"%s\": %m", filename);
			exit(1);
		}

		fclose(cf);
	}
}

/*
 * Escape a string so that it can be used as a value in a key-value pair