pg_controldata.c

Go to the documentation of this file.

/*
 * pg_controldata
 *
 * reads the data from $PGDATA/global/pg_control
 *
 * copyright (c) Oliver Elphick <olly@lfix.co.uk>, 2001;
 * license: BSD
 *
 * src/bin/pg_controldata/pg_controldata.c
 */

/*
 * We have to use postgres.h not postgres_fe.h here, because there's so much
 * backend-only stuff in the XLOG include files we need.  But we need a
 * frontend-ish environment otherwise.  Hence this ugly hack.
 */
#define FRONTEND 1

#include "postgres.h"

#include <time.h>

#include "access/transam.h"
#include "access/xlog.h"
#include "access/xlog_internal.h"
#include "catalog/pg_control.h"
#include "common/controldata_utils.h"
#include "common/logging.h"
#include "getopt_long.h"
#include "pg_getopt.h"

static void
usage(const char *progname)
{
    printf(_("%s displays control information of a PostgreSQL database cluster.\n\n"), progname);
    printf(_("Usage:\n"));
    printf(_("  %s [OPTION] [DATADIR]\n"), progname);
    printf(_("\nOptions:\n"));
    printf(_(" [-D, --pgdata=]DATADIR  data directory\n"));
    printf(_("  -V, --version          output version information, then exit\n"));
    printf(_("  -?, --help             show this help, then exit\n"));
    printf(_("\nIf no data directory (DATADIR) is specified, "
             "the environment variable PGDATA\nis used.\n\n"));
    printf(_("Report bugs to <%s>.\n"), PACKAGE_BUGREPORT);
    printf(_("%s home page: <%s>\n"), PACKAGE_NAME, PACKAGE_URL);
}


static const char *
dbState(DBState state)
{
    switch (state)
    {
        case DB_STARTUP:
            return _("starting up");
        case DB_SHUTDOWNED:
            return _("shut down");
        case DB_SHUTDOWNED_IN_RECOVERY:
            return _("shut down in recovery");
        case DB_SHUTDOWNING:
            return _("shutting down");
        case DB_IN_CRASH_RECOVERY:
            return _("in crash recovery");
        case DB_IN_ARCHIVE_RECOVERY:
            return _("in archive recovery");
        case DB_IN_PRODUCTION:
            return _("in production");
    }
    return _("unrecognized status code");
}

static const char *
wal_level_str(WalLevel wal_level)
{
    switch (wal_level)
    {
        case WAL_LEVEL_MINIMAL:
            return "minimal";
        case WAL_LEVEL_REPLICA:
            return "replica";
        case WAL_LEVEL_LOGICAL:
            return "logical";
    }
    return _("unrecognized wal_level");
}


int
main(int argc, char *argv[])
{
    static struct option long_options[] = {
        {"pgdata", required_argument, NULL, 'D'},
        {NULL, 0, NULL, 0}
    };

    ControlFileData *ControlFile;
    bool        crc_ok;
    char       *DataDir = NULL;
    time_t      time_tmp;
    char        pgctime_str[128];
    char        ckpttime_str[128];
    char        mock_auth_nonce_str[MOCK_AUTH_NONCE_LEN * 2 + 1];
    const char *strftime_fmt = "%c";
    const char *progname;
    char        xlogfilename[MAXFNAMELEN];
    int         c;
    int         i;
    int         WalSegSz;

    pg_logging_init(argv[0]);
    set_pglocale_pgservice(argv[0], PG_TEXTDOMAIN("pg_controldata"));
    progname = get_progname(argv[0]);

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

    while ((c = getopt_long(argc, argv, "D:", long_options, NULL)) != -1)
    {
        switch (c)
        {
            case 'D':
                DataDir = optarg;
                break;

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

    if (DataDir == NULL)
    {
        if (optind < argc)
            DataDir = argv[optind++];
        else
            DataDir = getenv("PGDATA");
    }

    /* Complain if any arguments remain */
    if (optind < argc)
    {
        pg_log_error("too many command-line arguments (first is \"%s\")",
                     argv[optind]);
        fprintf(stderr, _("Try \"%s --help\" for more information.\n"),
                progname);
        exit(1);
    }

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

    /* get a copy of the control file */
    ControlFile = get_controlfile(DataDir, &crc_ok);
    if (!crc_ok)
        printf(_("WARNING: Calculated CRC checksum does not match value stored in file.\n"
                 "Either the file is corrupt, or it has a different layout than this program\n"
                 "is expecting.  The results below are untrustworthy.\n\n"));

    /* set wal segment size */
    WalSegSz = ControlFile->xlog_seg_size;

    if (!IsValidWalSegSize(WalSegSz))
    {
        printf(_("WARNING: invalid WAL segment size\n"));
        printf(ngettext("The WAL segment size stored in the file, %d byte, is not a power of two\n"
                        "between 1 MB and 1 GB.  The file is corrupt and the results below are\n"
                        "untrustworthy.\n\n",
                        "The WAL segment size stored in the file, %d bytes, is not a power of two\n"
                        "between 1 MB and 1 GB.  The file is corrupt and the results below are\n"
                        "untrustworthy.\n\n",
                        WalSegSz),
               WalSegSz);
    }

    /*
     * This slightly-chintzy coding will work as long as the control file
     * timestamps are within the range of time_t; that should be the case in
     * all foreseeable circumstances, so we don't bother importing the
     * backend's timezone library into pg_controldata.
     *
     * Use variable for format to suppress overly-anal-retentive gcc warning
     * about %c
     */
    time_tmp = (time_t) ControlFile->time;
    strftime(pgctime_str, sizeof(pgctime_str), strftime_fmt,
             localtime(&time_tmp));
    time_tmp = (time_t) ControlFile->checkPointCopy.time;
    strftime(ckpttime_str, sizeof(ckpttime_str), strftime_fmt,
             localtime(&time_tmp));

    /*
     * Calculate name of the WAL file containing the latest checkpoint's REDO
     * start point.
     *
     * A corrupted control file could report a WAL segment size of 0, and to
     * guard against division by zero, we need to treat that specially.
     */
    if (WalSegSz != 0)
    {
        XLogSegNo   segno;

        XLByteToSeg(ControlFile->checkPointCopy.redo, segno, WalSegSz);
        XLogFileName(xlogfilename, ControlFile->checkPointCopy.ThisTimeLineID,
                     segno, WalSegSz);
    }
    else
        strcpy(xlogfilename, _("???"));

    for (i = 0; i < MOCK_AUTH_NONCE_LEN; i++)
        snprintf(&mock_auth_nonce_str[i * 2], 3, "%02x",
                 (unsigned char) ControlFile->mock_authentication_nonce[i]);

    printf(_("pg_control version number:            %u\n"),
           ControlFile->pg_control_version);
    printf(_("Catalog version number:               %u\n"),
           ControlFile->catalog_version_no);
    printf(_("Database system identifier:           %llu\n"),
           (unsigned long long) ControlFile->system_identifier);
    printf(_("Database cluster state:               %s\n"),
           dbState(ControlFile->state));
    printf(_("pg_control last modified:             %s\n"),
           pgctime_str);
    printf(_("Latest checkpoint location:           %X/%X\n"),
           (uint32) (ControlFile->checkPoint >> 32),
           (uint32) ControlFile->checkPoint);
    printf(_("Latest checkpoint's REDO location:    %X/%X\n"),
           (uint32) (ControlFile->checkPointCopy.redo >> 32),
           (uint32) ControlFile->checkPointCopy.redo);
    printf(_("Latest checkpoint's REDO WAL file:    %s\n"),
           xlogfilename);
    printf(_("Latest checkpoint's TimeLineID:       %u\n"),
           ControlFile->checkPointCopy.ThisTimeLineID);
    printf(_("Latest checkpoint's PrevTimeLineID:   %u\n"),
           ControlFile->checkPointCopy.PrevTimeLineID);
    printf(_("Latest checkpoint's full_page_writes: %s\n"),
           ControlFile->checkPointCopy.fullPageWrites ? _("on") : _("off"));
    printf(_("Latest checkpoint's NextXID:          %u:%u\n"),
           EpochFromFullTransactionId(ControlFile->checkPointCopy.nextFullXid),
           XidFromFullTransactionId(ControlFile->checkPointCopy.nextFullXid));
    printf(_("Latest checkpoint's NextOID:          %u\n"),
           ControlFile->checkPointCopy.nextOid);
    printf(_("Latest checkpoint's NextMultiXactId:  %u\n"),
           ControlFile->checkPointCopy.nextMulti);
    printf(_("Latest checkpoint's NextMultiOffset:  %u\n"),
           ControlFile->checkPointCopy.nextMultiOffset);
    printf(_("Latest checkpoint's oldestXID:        %u\n"),
           ControlFile->checkPointCopy.oldestXid);
    printf(_("Latest checkpoint's oldestXID's DB:   %u\n"),
           ControlFile->checkPointCopy.oldestXidDB);
    printf(_("Latest checkpoint's oldestActiveXID:  %u\n"),
           ControlFile->checkPointCopy.oldestActiveXid);
    printf(_("Latest checkpoint's oldestMultiXid:   %u\n"),
           ControlFile->checkPointCopy.oldestMulti);
    printf(_("Latest checkpoint's oldestMulti's DB: %u\n"),
           ControlFile->checkPointCopy.oldestMultiDB);
    printf(_("Latest checkpoint's oldestCommitTsXid:%u\n"),
           ControlFile->checkPointCopy.oldestCommitTsXid);
    printf(_("Latest checkpoint's newestCommitTsXid:%u\n"),
           ControlFile->checkPointCopy.newestCommitTsXid);
    printf(_("Time of latest checkpoint:            %s\n"),
           ckpttime_str);
    printf(_("Fake LSN counter for unlogged rels:   %X/%X\n"),
           (uint32) (ControlFile->unloggedLSN >> 32),
           (uint32) ControlFile->unloggedLSN);
    printf(_("Minimum recovery ending location:     %X/%X\n"),
           (uint32) (ControlFile->minRecoveryPoint >> 32),
           (uint32) ControlFile->minRecoveryPoint);
    printf(_("Min recovery ending loc's timeline:   %u\n"),
           ControlFile->minRecoveryPointTLI);
    printf(_("Backup start location:                %X/%X\n"),
           (uint32) (ControlFile->backupStartPoint >> 32),
           (uint32) ControlFile->backupStartPoint);
    printf(_("Backup end location:                  %X/%X\n"),
           (uint32) (ControlFile->backupEndPoint >> 32),
           (uint32) ControlFile->backupEndPoint);
    printf(_("End-of-backup record required:        %s\n"),
           ControlFile->backupEndRequired ? _("yes") : _("no"));
    printf(_("wal_level setting:                    %s\n"),
           wal_level_str(ControlFile->wal_level));
    printf(_("wal_log_hints setting:                %s\n"),
           ControlFile->wal_log_hints ? _("on") : _("off"));
    printf(_("max_connections setting:              %d\n"),
           ControlFile->MaxConnections);
    printf(_("max_worker_processes setting:         %d\n"),
           ControlFile->max_worker_processes);
    printf(_("max_wal_senders setting:              %d\n"),
           ControlFile->max_wal_senders);
    printf(_("max_prepared_xacts setting:           %d\n"),
           ControlFile->max_prepared_xacts);
    printf(_("max_locks_per_xact setting:           %d\n"),
           ControlFile->max_locks_per_xact);
    printf(_("track_commit_timestamp setting:       %s\n"),
           ControlFile->track_commit_timestamp ? _("on") : _("off"));
    printf(_("Maximum data alignment:               %u\n"),
           ControlFile->maxAlign);
    /* we don't print floatFormat since can't say much useful about it */
    printf(_("Database block size:                  %u\n"),
           ControlFile->blcksz);
    printf(_("Blocks per segment of large relation: %u\n"),
           ControlFile->relseg_size);
    printf(_("WAL block size:                       %u\n"),
           ControlFile->xlog_blcksz);
    printf(_("Bytes per WAL segment:                %u\n"),
           ControlFile->xlog_seg_size);
    printf(_("Maximum length of identifiers:        %u\n"),
           ControlFile->nameDataLen);
    printf(_("Maximum columns in an index:          %u\n"),
           ControlFile->indexMaxKeys);
    printf(_("Maximum size of a TOAST chunk:        %u\n"),
           ControlFile->toast_max_chunk_size);
    printf(_("Size of a large-object chunk:         %u\n"),
           ControlFile->loblksize);
    /* This is no longer configurable, but users may still expect to see it: */
    printf(_("Date/time type storage:               %s\n"),
           _("64-bit integers"));
    printf(_("Float8 argument passing:              %s\n"),
           (ControlFile->float8ByVal ? _("by value") : _("by reference")));
    printf(_("Data page checksum version:           %u\n"),
           ControlFile->data_checksum_version);
    printf(_("Mock authentication nonce:            %s\n"),
           mock_auth_nonce_str);
    return 0;
}