Пример #1
0
int
main(int argc, char *argv[])
{
	int			c;
	bool		force = false;
	bool		noupdate = false;
	uint32		set_xid_epoch = (uint32) -1;
	TransactionId set_xid = 0;
	Oid			set_oid = 0;
	MultiXactId set_mxid = 0;
	MultiXactOffset set_mxoff = (MultiXactOffset) -1;
	uint32		minXlogTli = 0,
				minXlogId = 0,
				minXlogSeg = 0;
	char	   *endptr;
	char	   *endptr2;
	char	   *endptr3;
	char	   *DataDir;
	int			fd;
	char		path[MAXPGPATH];

	set_pglocale_pgservice(argv[0], PG_TEXTDOMAIN("pg_resetxlog"));

	progname = get_progname(argv[0]);

	if (argc > 1)
	{
		if (strcmp(argv[1], "--help") == 0 || strcmp(argv[1], "-?") == 0)
		{
			usage();
			exit(0);
		}
		if (strcmp(argv[1], "--version") == 0 || strcmp(argv[1], "-V") == 0)
		{
			puts("pg_resetxlog (Greenplum Database) " PG_VERSION);
			exit(0);
		}
		if (strcmp(argv[1], "--gp-version") == 0)
		{
			puts("pg_resetxlog (Greenplum Database) " GP_VERSION);
			exit(0);
		}
	}


	while ((c = getopt(argc, argv, "fl:m:no:O:x:e:")) != -1)
	{
		switch (c)
		{
			case 'f':
				force = true;
				break;

			case 'n':
				noupdate = true;
				break;

			case 'e':
				set_xid_epoch = strtoul(optarg, &endptr, 0);
				if (endptr == optarg || *endptr != '\0')
				{
					fprintf(stderr, _("%s: invalid argument for option -e\n"), progname);
					fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
					exit(1);
				}
				if (set_xid_epoch == -1)
				{
					fprintf(stderr, _("%s: transaction ID epoch (-e) must not be -1\n"), progname);
					exit(1);
				}
				break;

			case 'x':
				set_xid = strtoul(optarg, &endptr, 0);
				if (endptr == optarg || *endptr != '\0')
				{
					fprintf(stderr, _("%s: invalid argument for option -x\n"), progname);
					fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
					exit(1);
				}
				if (set_xid == 0)
				{
					fprintf(stderr, _("%s: transaction ID (-x) must not be 0\n"), progname);
					exit(1);
				}
				break;

			case 'o':
				set_oid = strtoul(optarg, &endptr, 0);
				if (endptr == optarg || *endptr != '\0')
				{
					fprintf(stderr, _("%s: invalid argument for option -o\n"), progname);
					fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
					exit(1);
				}
				if (set_oid == 0)
				{
					fprintf(stderr, _("%s: OID (-o) must not be 0\n"), progname);
					exit(1);
				}
				break;

			case 'm':
				set_mxid = strtoul(optarg, &endptr, 0);
				if (endptr == optarg || *endptr != '\0')
				{
					fprintf(stderr, _("%s: invalid argument for option -m\n"), progname);
					fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
					exit(1);
				}
				if (set_mxid == 0)
				{
					fprintf(stderr, _("%s: multitransaction ID (-m) must not be 0\n"), progname);
					exit(1);
				}
				break;

			case 'O':
				set_mxoff = strtoul(optarg, &endptr, 0);
				if (endptr == optarg || *endptr != '\0')
				{
					fprintf(stderr, _("%s: invalid argument for option -O\n"), progname);
					fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
					exit(1);
				}
				if (set_mxoff == -1)
				{
					fprintf(stderr, _("%s: multitransaction offset (-O) must not be -1\n"), progname);
					exit(1);
				}
				break;

			case 'l':
				minXlogTli = strtoul(optarg, &endptr, 0);
				if (endptr == optarg || *endptr != ',')
				{
					fprintf(stderr, _("%s: invalid argument for option -l\n"), progname);
					fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
					exit(1);
				}
				minXlogId = strtoul(endptr + 1, &endptr2, 0);
				if (endptr2 == endptr + 1 || *endptr2 != ',')
				{
					fprintf(stderr, _("%s: invalid argument for option -l\n"), progname);
					fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
					exit(1);
				}
				minXlogSeg = strtoul(endptr2 + 1, &endptr3, 0);
				if (endptr3 == endptr2 + 1 || *endptr3 != '\0')
				{
					fprintf(stderr, _("%s: invalid argument for option -l\n"), progname);
					fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
					exit(1);
				}
				break;

			default:
				fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
				exit(1);
		}
	}

	if (optind == argc)
	{
		fprintf(stderr, _("%s: no data directory specified\n"), progname);
		fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
		exit(1);
	}

	/*
	 * Don't allow pg_resetxlog to be run as root, to avoid overwriting the
	 * ownership of files in the data directory. We need only check for root
	 * -- any other user won't have sufficient permissions to modify files in
	 * the data directory.
	 */
#ifndef WIN32
	if (geteuid() == 0)
	{
		fprintf(stderr, _("%s: cannot be executed by \"root\"\n"),
				progname);
		fprintf(stderr, _("You must run %s as the PostgreSQL superuser.\n"),
				progname);
		exit(1);
	}
#endif

	DataDir = argv[optind];

	if (chdir(DataDir) < 0)
	{
		fprintf(stderr, _("%s: could not change directory to \"%s\": %s\n"),
				progname, DataDir, strerror(errno));
		exit(1);
	}

	/*
	 * Check for a postmaster lock file --- if there is one, refuse to
	 * proceed, on grounds we might be interfering with a live installation.
	 */
	snprintf(path, MAXPGPATH, "%s/postmaster.pid", DataDir);

	if ((fd = open(path, O_RDONLY, 0)) < 0)
	{
		if (errno != ENOENT)
		{
			fprintf(stderr, _("%s: could not open file \"%s\" for reading: %s\n"), progname, path, strerror(errno));
			exit(1);
		}
	}
	else
	{
		fprintf(stderr, _("%s: lock file \"%s\" exists\n"
						  "Is a server running?  If not, delete the lock file and try again.\n"),
				progname, path);
		exit(1);
	}

	/*
	 * Attempt to read the existing pg_control file
	 */
	if (!ReadControlFile())
		GuessControlValues();

	/*
	 * Adjust fields if required by switches.  (Do this now so that printout,
	 * if any, includes these values.)
	 */
	if (set_xid_epoch != -1)
		ControlFile.checkPointCopy.nextXidEpoch = set_xid_epoch;

	if (set_xid != 0)
		ControlFile.checkPointCopy.nextXid = set_xid;

	if (set_oid != 0)
		ControlFile.checkPointCopy.nextOid = set_oid;

	if (set_mxid != 0)
		ControlFile.checkPointCopy.nextMulti = set_mxid;

	if (set_mxoff != -1)
		ControlFile.checkPointCopy.nextMultiOffset = set_mxoff;

	if (minXlogTli > ControlFile.checkPointCopy.ThisTimeLineID)
		ControlFile.checkPointCopy.ThisTimeLineID = minXlogTli;

	if (minXlogId > ControlFile.logId ||
		(minXlogId == ControlFile.logId &&
		 minXlogSeg > ControlFile.logSeg))
	{
		ControlFile.logId = minXlogId;
		ControlFile.logSeg = minXlogSeg;
	}

	/*
	 * If we had to guess anything, and -f was not given, just print the
	 * guessed values and exit.  Also print if -n is given.
	 */
	if ((guessed && !force) || noupdate)
	{
		PrintControlValues(guessed);
		if (!noupdate)
		{
			printf(_("\nIf these values seem acceptable, use -f to force reset.\n"));
			exit(1);
		}
		else
			exit(0);
	}

	/*
	 * Don't reset from a dirty pg_control without -f, either.
	 */
	if (ControlFile.state != DB_SHUTDOWNED && !force)
	{
		printf(_("The database server was not shut down cleanly.\n"
			   "Resetting the transaction log might cause data to be lost.\n"
				 "If you want to proceed anyway, use -f to force reset.\n"));
		exit(1);
	}

	/*
	 * Else, do the dirty deed.
	 */
	RewriteControlFile();
	KillExistingXLOG();
	WriteEmptyXLOG();

	printf(_("Transaction log reset\n"));
	return 0;
}
Пример #2
0
int
main(int argc, char *argv[])
{
	int			c;
	bool		force = false;
	bool		noupdate = false;
	MultiXactId set_oldestmxid = 0;
	char	   *endptr;
	char	   *endptr2;
	char	   *DataDir = NULL;
	int			fd;

	set_pglocale_pgservice(argv[0], PG_TEXTDOMAIN("pg_resetxlog"));

	progname = get_progname(argv[0]);

	if (argc > 1)
	{
		if (strcmp(argv[1], "--help") == 0 || strcmp(argv[1], "-?") == 0)
		{
			usage();
			exit(0);
		}
		if (strcmp(argv[1], "--version") == 0 || strcmp(argv[1], "-V") == 0)
		{
			puts("pg_resetxlog (PostgreSQL) " PG_VERSION);
			exit(0);
		}
	}


	while ((c = getopt(argc, argv, "D:fl:m:no:O:x:e:")) != -1)
	{
		switch (c)
		{
			case 'D':
				DataDir = optarg;
				break;

			case 'f':
				force = true;
				break;

			case 'n':
				noupdate = true;
				break;

			case 'e':
				set_xid_epoch = strtoul(optarg, &endptr, 0);
				if (endptr == optarg || *endptr != '\0')
				{
					fprintf(stderr, _("%s: invalid argument for option -e\n"), progname);
					fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
					exit(1);
				}
				if (set_xid_epoch == -1)
				{
					fprintf(stderr, _("%s: transaction ID epoch (-e) must not be -1\n"), progname);
					exit(1);
				}
				break;

			case 'x':
				set_xid = strtoul(optarg, &endptr, 0);
				if (endptr == optarg || *endptr != '\0')
				{
					fprintf(stderr, _("%s: invalid argument for option -x\n"), progname);
					fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
					exit(1);
				}
				if (set_xid == 0)
				{
					fprintf(stderr, _("%s: transaction ID (-x) must not be 0\n"), progname);
					exit(1);
				}
				break;

			case 'o':
				set_oid = strtoul(optarg, &endptr, 0);
				if (endptr == optarg || *endptr != '\0')
				{
					fprintf(stderr, _("%s: invalid argument for option -o\n"), progname);
					fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
					exit(1);
				}
				if (set_oid == 0)
				{
					fprintf(stderr, _("%s: OID (-o) must not be 0\n"), progname);
					exit(1);
				}
				break;

			case 'm':
				set_mxid = strtoul(optarg, &endptr, 0);
				if (endptr == optarg || *endptr != ',')
				{
					fprintf(stderr, _("%s: invalid argument for option -m\n"), progname);
					fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
					exit(1);
				}

				set_oldestmxid = strtoul(endptr + 1, &endptr2, 0);
				if (endptr2 == endptr + 1 || *endptr2 != '\0')
				{
					fprintf(stderr, _("%s: invalid argument for option -m\n"), progname);
					fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
					exit(1);
				}
				if (set_mxid == 0)
				{
					fprintf(stderr, _("%s: multitransaction ID (-m) must not be 0\n"), progname);
					exit(1);
				}

				/*
				 * XXX It'd be nice to have more sanity checks here, e.g. so
				 * that oldest is not wrapped around w.r.t. nextMulti.
				 */
				if (set_oldestmxid == 0)
				{
					fprintf(stderr, _("%s: oldest multitransaction ID (-m) must not be 0\n"),
							progname);
					exit(1);
				}
				break;

			case 'O':
				set_mxoff = strtoul(optarg, &endptr, 0);
				if (endptr == optarg || *endptr != '\0')
				{
					fprintf(stderr, _("%s: invalid argument for option -O\n"), progname);
					fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
					exit(1);
				}
				if (set_mxoff == -1)
				{
					fprintf(stderr, _("%s: multitransaction offset (-O) must not be -1\n"), progname);
					exit(1);
				}
				break;

			case 'l':
				if (strspn(optarg, "01234567890ABCDEFabcdef") != 24)
				{
					fprintf(stderr, _("%s: invalid argument for option -l\n"), progname);
					fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
					exit(1);
				}
				XLogFromFileName(optarg, &minXlogTli, &minXlogSegNo);
				break;

			default:
				fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
				exit(1);
		}
	}

	if (DataDir == NULL && optind == argc)
	{
		fprintf(stderr, _("%s: no data directory specified\n"), progname);
		fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
		exit(1);
	}
	if (DataDir == NULL)
		DataDir = argv[optind];

	/*
	 * Don't allow pg_resetxlog to be run as root, to avoid overwriting the
	 * ownership of files in the data directory. We need only check for root
	 * -- any other user won't have sufficient permissions to modify files in
	 * the data directory.
	 */
#ifndef WIN32
	if (geteuid() == 0)
	{
		fprintf(stderr, _("%s: cannot be executed by \"root\"\n"),
				progname);
		fprintf(stderr, _("You must run %s as the PostgreSQL superuser.\n"),
				progname);
		exit(1);
	}
#endif

	if (chdir(DataDir) < 0)
	{
		fprintf(stderr, _("%s: could not change directory to \"%s\": %s\n"),
				progname, DataDir, strerror(errno));
		exit(1);
	}

	/*
	 * Check for a postmaster lock file --- if there is one, refuse to
	 * proceed, on grounds we might be interfering with a live installation.
	 */
	if ((fd = open("postmaster.pid", O_RDONLY, 0)) < 0)
	{
		if (errno != ENOENT)
		{
			fprintf(stderr, _("%s: could not open file \"%s\" for reading: %s\n"),
					progname, "postmaster.pid", strerror(errno));
			exit(1);
		}
	}
	else
	{
		fprintf(stderr, _("%s: lock file \"%s\" exists\n"
						  "Is a server running?  If not, delete the lock file and try again.\n"),
				progname, "postmaster.pid");
		exit(1);
	}

	/*
	 * Attempt to read the existing pg_control file
	 */
	if (!ReadControlFile())
		GuessControlValues();

	/*
	 * Also look at existing segment files to set up newXlogSegNo
	 */
	FindEndOfXLOG();

	/*
	 * If we're not going to proceed with the reset, print the current control
	 * file parameters.
	 */
	if ((guessed && !force) || noupdate)
		PrintControlValues(guessed);

	/*
	 * Adjust fields if required by switches.  (Do this now so that printout,
	 * if any, includes these values.)
	 */
	if (set_xid_epoch != -1)
		ControlFile.checkPointCopy.nextXidEpoch = set_xid_epoch;

	if (set_xid != 0)
	{
		ControlFile.checkPointCopy.nextXid = set_xid;

		/*
		 * For the moment, just set oldestXid to a value that will force
		 * immediate autovacuum-for-wraparound.  It's not clear whether adding
		 * user control of this is useful, so let's just do something that's
		 * reasonably safe.  The magic constant here corresponds to the
		 * maximum allowed value of autovacuum_freeze_max_age.
		 */
		ControlFile.checkPointCopy.oldestXid = set_xid - 2000000000;
		if (ControlFile.checkPointCopy.oldestXid < FirstNormalTransactionId)
			ControlFile.checkPointCopy.oldestXid += FirstNormalTransactionId;
		ControlFile.checkPointCopy.oldestXidDB = InvalidOid;
	}

	if (set_oid != 0)
		ControlFile.checkPointCopy.nextOid = set_oid;

	if (set_mxid != 0)
	{
		ControlFile.checkPointCopy.nextMulti = set_mxid;

		ControlFile.checkPointCopy.oldestMulti = set_oldestmxid;
		if (ControlFile.checkPointCopy.oldestMulti < FirstMultiXactId)
			ControlFile.checkPointCopy.oldestMulti += FirstMultiXactId;
		ControlFile.checkPointCopy.oldestMultiDB = InvalidOid;
	}

	if (set_mxoff != -1)
		ControlFile.checkPointCopy.nextMultiOffset = set_mxoff;

	if (minXlogTli > ControlFile.checkPointCopy.ThisTimeLineID)
	{
		ControlFile.checkPointCopy.ThisTimeLineID = minXlogTli;
		ControlFile.checkPointCopy.PrevTimeLineID = minXlogTli;
	}

	if (minXlogSegNo > newXlogSegNo)
		newXlogSegNo = minXlogSegNo;

	/*
	 * If we had to guess anything, and -f was not given, just print the
	 * guessed values and exit.  Also print if -n is given.
	 */
	if ((guessed && !force) || noupdate)
	{
		PrintNewControlValues();
		if (!noupdate)
		{
			printf(_("\nIf these values seem acceptable, use -f to force reset.\n"));
			exit(1);
		}
		else
			exit(0);
	}

	/*
	 * Don't reset from a dirty pg_control without -f, either.
	 */
	if (ControlFile.state != DB_SHUTDOWNED && !force)
	{
		printf(_("The database server was not shut down cleanly.\n"
			   "Resetting the transaction log might cause data to be lost.\n"
				 "If you want to proceed anyway, use -f to force reset.\n"));
		exit(1);
	}

	/*
	 * Else, do the dirty deed.
	 */
	RewriteControlFile();
	KillExistingXLOG();
	KillExistingArchiveStatus();
	WriteEmptyXLOG();

	printf(_("Transaction log reset\n"));
	return 0;
}