pg_dumpall.c

PostgreSQL7.4.6 for Linux

						   "coalesce("
				"(select usename from pg_shadow where usesysid=datdba), "
						   "(select usename from pg_shadow where usesysid=(select datdba from pg_database where datname='template0'))), "
						   "pg_encoding_to_char(d.encoding), "
						   "datistemplate, datpath, '' as datacl "
						   "FROM pg_database d "
						   "WHERE datallowconn ORDER BY 1");
	else
	{
		/*
		 * In 7.0, datpath is either the same as datname, or the user-given
		 * location with "/" and the datname appended.  We must strip this
		 * junk off to produce a correct LOCATION value.
		 *
		 * Note: 7.0 fails to cope with sub-select in COALESCE, so just
		 * deal with getting a NULL by not printing any OWNER clause.
		 */
		res = executeQuery(conn,
						   "SELECT datname, "
				"(select usename from pg_shadow where usesysid=datdba), "
						   "pg_encoding_to_char(d.encoding), "
						   "'f' as datistemplate, "
						   "CASE WHEN length(datpath) > length(datname) THEN "
						   "substr(datpath,1,length(datpath)-length(datname)-1) "
						   "ELSE '' END as datpath, "
						   "'' as datacl "
						   "FROM pg_database d "
						   "ORDER BY 1");
	}

	for (i = 0; i < PQntuples(res); i++)
	{
		PQExpBuffer buf;
		char	   *dbname = PQgetvalue(res, i, 0);
		char	   *dbowner = PQgetvalue(res, i, 1);
		char	   *dbencoding = PQgetvalue(res, i, 2);
		char	   *dbistemplate = PQgetvalue(res, i, 3);
		char	   *dbpath = PQgetvalue(res, i, 4);
		char	   *dbacl = PQgetvalue(res, i, 5);
		char	   *fdbname;

		if (strcmp(dbname, "template1") == 0)
			continue;

		buf = createPQExpBuffer();

		/* needed for buildACLCommands() */
		fdbname = strdup(fmtId(dbname));

		if (output_clean)
			appendPQExpBuffer(buf, "DROP DATABASE %s;\n", fdbname);

		appendPQExpBuffer(buf, "CREATE DATABASE %s", fdbname);
		if (strlen(dbowner) != 0)
			appendPQExpBuffer(buf, " WITH OWNER = %s",
							  fmtId(dbowner));
		appendPQExpBuffer(buf, " TEMPLATE = template0");

		if (strlen(dbpath) != 0)
		{
			appendPQExpBuffer(buf, " LOCATION = ");
			appendStringLiteral(buf, dbpath, true);
		}

		appendPQExpBuffer(buf, " ENCODING = ");
		appendStringLiteral(buf, dbencoding, true);

		appendPQExpBuffer(buf, ";\n");

		if (strcmp(dbistemplate, "t") == 0)
		{
			appendPQExpBuffer(buf, "UPDATE pg_database SET datistemplate = 't' WHERE datname = ");
			appendStringLiteral(buf, dbname, true);
			appendPQExpBuffer(buf, ";\n");
		}

		if (!skip_acls &&
			!buildACLCommands(fdbname, "DATABASE", dbacl, dbowner,
							  server_version, buf))
		{
			fprintf(stderr, _("%s: could not parse ACL list (%s) for database \"%s\"\n"),
					progname, dbacl, fdbname);
			PQfinish(conn);
			exit(1);
		}

		printf("%s", buf->data);
		destroyPQExpBuffer(buf);
		free(fdbname);

		if (server_version >= 70300)
			dumpDatabaseConfig(conn, dbname);
	}

	PQclear(res);
	printf("\n\n");
}



/*
 * Dump database-specific configuration
 */
static void
dumpDatabaseConfig(PGconn *conn, const char *dbname)
{
	PQExpBuffer buf = createPQExpBuffer();
	int			count = 1;

	for (;;)
	{
		PGresult   *res;

		printfPQExpBuffer(buf, "SELECT datconfig[%d] FROM pg_database WHERE datname = ", count);
		appendStringLiteral(buf, dbname, true);
		appendPQExpBuffer(buf, ";");

		res = executeQuery(conn, buf->data);
		if (!PQgetisnull(res, 0, 0))
		{
			makeAlterConfigCommand(PQgetvalue(res, 0, 0), "DATABASE", dbname);
			PQclear(res);
			count++;
		}
		else
		{
			PQclear(res);
			break;
		}
	}

	destroyPQExpBuffer(buf);
}



/*
 * Dump user-specific configuration
 */
static void
dumpUserConfig(PGconn *conn, const char *username)
{
	PQExpBuffer buf = createPQExpBuffer();
	int			count = 1;

	for (;;)
	{
		PGresult   *res;

		printfPQExpBuffer(buf, "SELECT useconfig[%d] FROM pg_shadow WHERE usename = ", count);
		appendStringLiteral(buf, username, true);
		appendPQExpBuffer(buf, ";");

		res = executeQuery(conn, buf->data);
		if (!PQgetisnull(res, 0, 0))
		{
			makeAlterConfigCommand(PQgetvalue(res, 0, 0), "USER", username);
			PQclear(res);
			count++;
		}
		else
		{
			PQclear(res);
			break;
		}
	}

	destroyPQExpBuffer(buf);
}



/*
 * Helper function for dumpXXXConfig().
 */
static void
makeAlterConfigCommand(const char *arrayitem, const char *type, const char *name)
{
	char	   *pos;
	char	   *mine;
	PQExpBuffer buf = createPQExpBuffer();

	mine = strdup(arrayitem);
	pos = strchr(mine, '=');
	if (pos == NULL)
		return;

	*pos = 0;
	appendPQExpBuffer(buf, "ALTER %s %s ", type, fmtId(name));
	appendPQExpBuffer(buf, "SET %s TO ", fmtId(mine));
	appendStringLiteral(buf, pos + 1, false);
	appendPQExpBuffer(buf, ";\n");

	printf("%s", buf->data);
	destroyPQExpBuffer(buf);
	free(mine);
}



/*
 * Dump contents of databases.
 */
static void
dumpDatabases(PGconn *conn)
{
	PGresult   *res;
	int			i;

	if (server_version >= 70100)
		res = executeQuery(conn, "SELECT datname FROM pg_database WHERE datallowconn ORDER BY 1");
	else
		res = executeQuery(conn, "SELECT datname FROM pg_database ORDER BY 1");

	for (i = 0; i < PQntuples(res); i++)
	{
		int			ret;

		char	   *dbname = PQgetvalue(res, i, 0);

		if (verbose)
			fprintf(stderr, _("%s: dumping database \"%s\"...\n"), progname, dbname);

		printf("\\connect %s\n\n", fmtId(dbname));
		ret = runPgDump(dbname);
		if (ret != 0)
		{
			fprintf(stderr, _("%s: pg_dump failed on database \"%s\", exiting\n"), progname, dbname);
			exit(1);
		}
	}

	PQclear(res);
}



/*
 * Run pg_dump on dbname.
 */
static int
runPgDump(const char *dbname)
{
	PQExpBuffer cmd = createPQExpBuffer();
	const char *p;
	int			ret;

	appendPQExpBuffer(cmd, "%s %s -Fp '", pgdumploc, pgdumpopts->data);

	/* Shell quoting is not quite like SQL quoting, so can't use fmtId */
	for (p = dbname; *p; p++)
	{
		if (*p == '\'')
			appendPQExpBuffer(cmd, "'\"'\"'");
		else
			appendPQExpBufferChar(cmd, *p);
	}

	appendPQExpBufferChar(cmd, '\'');

	if (verbose)
		fprintf(stderr, _("%s: running \"%s\"\n"), progname, cmd->data);

	fflush(stdout);
	fflush(stderr);

	ret = system(cmd->data);

	destroyPQExpBuffer(cmd);

	return ret;
}



/*
 * Make a database connection with the given parameters.  An
 * interactive password prompt is automatically issued if required.
 */
static PGconn *
connectDatabase(const char *dbname, const char *pghost, const char *pgport,
				const char *pguser, bool require_password)
{
	PGconn	   *conn;
	char	   *password = NULL;
	bool		need_pass = false;
	const char *remoteversion_str;

	if (require_password)
		password = simple_prompt("Password: ", 100, false);

	/*
	 * Start the connection.  Loop until we have a password if requested
	 * by backend.
	 */
	do
	{
		need_pass = false;
		conn = PQsetdbLogin(pghost, pgport, NULL, NULL, dbname, pguser, password);

		if (!conn)
		{
			fprintf(stderr, _("%s: could not connect to database \"%s\"\n"),
					progname, dbname);
			exit(1);
		}

		if (PQstatus(conn) == CONNECTION_BAD &&
			strcmp(PQerrorMessage(conn), "fe_sendauth: no password supplied\n") == 0 &&
			!feof(stdin))
		{
			PQfinish(conn);
			need_pass = true;
			free(password);
			password = NULL;
			password = simple_prompt("Password: ", 100, false);
		}
	} while (need_pass);

	if (password)
		free(password);

	/* check to see that the backend connection was successfully made */
	if (PQstatus(conn) == CONNECTION_BAD)
	{
		fprintf(stderr, _("%s: could not connect to database \"%s\": %s\n"),
				progname, dbname, PQerrorMessage(conn));
		exit(1);
	}

	remoteversion_str = PQparameterStatus(conn, "server_version");
	if (!remoteversion_str)
	{
		fprintf(stderr, _("%s: could not get server version\n"), progname);
		exit(1);
	}
	server_version = parse_version(remoteversion_str);
	if (server_version < 0)
	{
		fprintf(stderr, _("%s: could not parse server version \"%s\"\n"),
				progname, remoteversion_str);
		exit(1);
	}

	return conn;
}



/*
 * Run a query, return the results, exit program on failure.
 */
static PGresult *
executeQuery(PGconn *conn, const char *query)
{
	PGresult   *res;

	if (verbose)
		fprintf(stderr, _("%s: executing %s\n"), progname, query);

	res = PQexec(conn, query);
	if (!res ||
		PQresultStatus(res) != PGRES_TUPLES_OK)
	{
		fprintf(stderr, _("%s: query failed: %s"), progname, PQerrorMessage(conn));
		fprintf(stderr, _("%s: query was: %s\n"), progname, query);
		PQfinish(conn);
		exit(1);
	}

	return res;
}



/*
 * Find location of pg_dump executable.
 */
static char *
findPgDump(const char *argv0)
{
	char	   *last;
	PQExpBuffer cmd;
	static char *result = NULL;

	if (result)
		return result;

	cmd = createPQExpBuffer();
	last = last_path_separator(argv0);

	if (!last)
		appendPQExpBuffer(cmd, "pg_dump");
	else
	{
		char	   *dir = strdup(argv0);

		*(dir + (last - argv0)) = '\0';
		appendPQExpBuffer(cmd, "%s/pg_dump", dir);
	}

	result = strdup(cmd->data);

	appendPQExpBuffer(cmd, " -V >/dev/null 2>&1");
	if (system(cmd->data) == 0)
		goto end;

	result = BINDIR "/pg_dump";
	if (system(BINDIR "/pg_dump -V >/dev/null 2>&1") == 0)
		goto end;

	fprintf(stderr, _("%s: could not find pg_dump\n"
		"Make sure it is in the path or in the same directory as %s.\n"),
			progname, progname);
	exit(1);

end:
	destroyPQExpBuffer(cmd);
	return result;
}