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postgresql/contrib/pg_upgrade/controldata.c

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/*
* controldata.c
*
* controldata functions
*
* Copyright (c) 2010-2013, PostgreSQL Global Development Group
* contrib/pg_upgrade/controldata.c
*/
#include "postgres_fe.h"
#include "pg_upgrade.h"
#include <ctype.h>
/*
* get_control_data()
*
* gets pg_control information in "ctrl". Assumes that bindir and
* datadir are valid absolute paths to postgresql bin and pgdata
* directories respectively *and* pg_resetxlog is version compatible
* with datadir. The main purpose of this function is to get pg_control
* data in a version independent manner.
*
* The approach taken here is to invoke pg_resetxlog with -n option
* and then pipe its output. With little string parsing we get the
* pg_control data. pg_resetxlog cannot be run while the server is running
* so we use pg_controldata; pg_controldata doesn't provide all the fields
* we need to actually perform the upgrade, but it provides enough for
* check mode. We do not implement pg_resetxlog -n because it is hard to
* return valid xid data for a running server.
*/
void
get_control_data(ClusterInfo *cluster, bool live_check)
{
char cmd[MAXPGPATH];
char bufin[MAX_STRING];
FILE *output;
char *p;
bool got_xid = false;
bool got_oid = false;
bool got_nextxlogfile = false;
bool got_multi = false;
bool got_mxoff = false;
bool got_oldestmulti = false;
bool got_log_id = false;
bool got_log_seg = false;
bool got_tli = false;
bool got_align = false;
bool got_blocksz = false;
bool got_largesz = false;
bool got_walsz = false;
bool got_walseg = false;
bool got_ident = false;
bool got_index = false;
bool got_toast = false;
bool got_date_is_int = false;
bool got_float8_pass_by_value = false;
bool got_data_checksum_version = false;
char *lc_collate = NULL;
char *lc_ctype = NULL;
char *lc_monetary = NULL;
char *lc_numeric = NULL;
char *lc_time = NULL;
char *lang = NULL;
char *language = NULL;
char *lc_all = NULL;
char *lc_messages = NULL;
uint32 logid = 0;
uint32 segno = 0;
uint32 tli = 0;
/*
* Because we test the pg_resetxlog output as strings, it has to be in
* English. Copied from pg_regress.c.
*/
if (getenv("LC_COLLATE"))
lc_collate = pg_strdup(getenv("LC_COLLATE"));
if (getenv("LC_CTYPE"))
lc_ctype = pg_strdup(getenv("LC_CTYPE"));
if (getenv("LC_MONETARY"))
lc_monetary = pg_strdup(getenv("LC_MONETARY"));
if (getenv("LC_NUMERIC"))
lc_numeric = pg_strdup(getenv("LC_NUMERIC"));
if (getenv("LC_TIME"))
lc_time = pg_strdup(getenv("LC_TIME"));
if (getenv("LANG"))
lang = pg_strdup(getenv("LANG"));
if (getenv("LANGUAGE"))
language = pg_strdup(getenv("LANGUAGE"));
if (getenv("LC_ALL"))
lc_all = pg_strdup(getenv("LC_ALL"));
if (getenv("LC_MESSAGES"))
lc_messages = pg_strdup(getenv("LC_MESSAGES"));
pg_putenv("LC_COLLATE", NULL);
pg_putenv("LC_CTYPE", NULL);
pg_putenv("LC_MONETARY", NULL);
pg_putenv("LC_NUMERIC", NULL);
pg_putenv("LC_TIME", NULL);
pg_putenv("LANG",
#ifndef WIN32
NULL);
#else
/* On Windows the default locale cannot be English, so force it */
"en");
#endif
pg_putenv("LANGUAGE", NULL);
pg_putenv("LC_ALL", NULL);
pg_putenv("LC_MESSAGES", "C");
snprintf(cmd, sizeof(cmd), SYSTEMQUOTE "\"%s/%s \"%s\"" SYSTEMQUOTE,
cluster->bindir,
live_check ? "pg_controldata\"" : "pg_resetxlog\" -n",
cluster->pgdata);
fflush(stdout);
fflush(stderr);
if ((output = popen(cmd, "r")) == NULL)
pg_fatal("Could not get control data using %s: %s\n",
cmd, getErrorText(errno));
/* Only pre-8.4 has these so if they are not set below we will check later */
cluster->controldata.lc_collate = NULL;
cluster->controldata.lc_ctype = NULL;
/* Only in <= 8.3 */
if (GET_MAJOR_VERSION(cluster->major_version) <= 803)
{
cluster->controldata.float8_pass_by_value = false;
got_float8_pass_by_value = true;
}
/* Only in <= 9.2 */
if (GET_MAJOR_VERSION(cluster->major_version) <= 902)
{
cluster->controldata.data_checksum_version = 0;
got_data_checksum_version = true;
}
/* we have the result of cmd in "output". so parse it line by line now */
while (fgets(bufin, sizeof(bufin), output))
{
pg_log(PG_VERBOSE, "%s", bufin);
#ifdef WIN32
/*
* Due to an installer bug, LANG=C doesn't work for PG 8.3.3, but does
* work 8.2.6 and 8.3.7, so check for non-ASCII output and suggest a
* minor upgrade.
*/
if (GET_MAJOR_VERSION(cluster->major_version) <= 803)
{
for (p = bufin; *p; p++)
if (!isascii(*p))
pg_fatal("The 8.3 cluster's pg_controldata is incapable of outputting ASCII, even\n"
"with LANG=C. You must upgrade this cluster to a newer version of PostgreSQL\n"
"8.3 to fix this bug. PostgreSQL 8.3.7 and later are known to work properly.\n");
}
#endif
if ((p = strstr(bufin, "pg_control version number:")) != NULL)
{
p = strchr(p, ':');
if (p == NULL || strlen(p) <= 1)
pg_fatal("%d: pg_resetxlog problem\n", __LINE__);
p++; /* removing ':' char */
cluster->controldata.ctrl_ver = str2uint(p);
}
else if ((p = strstr(bufin, "Catalog version number:")) != NULL)
{
p = strchr(p, ':');
if (p == NULL || strlen(p) <= 1)
pg_fatal("%d: controldata retrieval problem\n", __LINE__);
p++; /* removing ':' char */
cluster->controldata.cat_ver = str2uint(p);
}
else if ((p = strstr(bufin, "First log segment after reset:")) != NULL)
{
/* Skip the colon and any whitespace after it */
p = strchr(p, ':');
if (p == NULL || strlen(p) <= 1)
pg_fatal("%d: controldata retrieval problem\n", __LINE__);
p = strpbrk(p, "01234567890ABCDEF");
if (p == NULL || strlen(p) <= 1)
pg_fatal("%d: controldata retrieval problem\n", __LINE__);
/* Make sure it looks like a valid WAL file name */
if (strspn(p, "0123456789ABCDEF") != 24)
pg_fatal("%d: controldata retrieval problem\n", __LINE__);
strlcpy(cluster->controldata.nextxlogfile, p, 25);
got_nextxlogfile = true;
}
else if ((p = strstr(bufin, "First log file ID after reset:")) != NULL)
{
p = strchr(p, ':');
if (p == NULL || strlen(p) <= 1)
pg_fatal("%d: controldata retrieval problem\n", __LINE__);
p++; /* removing ':' char */
logid = str2uint(p);
got_log_id = true;
}
else if ((p = strstr(bufin, "First log file segment after reset:")) != NULL)
{
p = strchr(p, ':');
if (p == NULL || strlen(p) <= 1)
pg_fatal("%d: controldata retrieval problem\n", __LINE__);
p++; /* removing ':' char */
segno = str2uint(p);
got_log_seg = true;
}
else if ((p = strstr(bufin, "Latest checkpoint's TimeLineID:")) != NULL)
{
p = strchr(p, ':');
if (p == NULL || strlen(p) <= 1)
pg_fatal("%d: controldata retrieval problem\n", __LINE__);
p++; /* removing ':' char */
cluster->controldata.chkpnt_tli = str2uint(p);
got_tli = true;
}
else if ((p = strstr(bufin, "Latest checkpoint's NextXID:")) != NULL)
{
char *op = strchr(p, '/');
if (op == NULL)
op = strchr(p, ':');
if (op == NULL || strlen(op) <= 1)
pg_fatal("%d: controldata retrieval problem\n", __LINE__);
op++; /* removing ':' char */
cluster->controldata.chkpnt_nxtxid = str2uint(op);
got_xid = true;
}
else if ((p = strstr(bufin, "Latest checkpoint's NextOID:")) != NULL)
{
p = strchr(p, ':');
if (p == NULL || strlen(p) <= 1)
pg_fatal("%d: controldata retrieval problem\n", __LINE__);
p++; /* removing ':' char */
cluster->controldata.chkpnt_nxtoid = str2uint(p);
got_oid = true;
}
else if ((p = strstr(bufin, "Latest checkpoint's NextMultiXactId:")) != NULL)
{
p = strchr(p, ':');
if (p == NULL || strlen(p) <= 1)
pg_fatal("%d: controldata retrieval problem\n", __LINE__);
p++; /* removing ':' char */
cluster->controldata.chkpnt_nxtmulti = str2uint(p);
got_multi = true;
}
else if ((p = strstr(bufin, "Latest checkpoint's oldestMultiXid:")) != NULL)
{
p = strchr(p, ':');
if (p == NULL || strlen(p) <= 1)
pg_fatal("%d: controldata retrieval problem\n", __LINE__);
p++; /* removing ':' char */
cluster->controldata.chkpnt_oldstMulti = str2uint(p);
got_oldestmulti = true;
}
else if ((p = strstr(bufin, "Latest checkpoint's NextMultiOffset:")) != NULL)
{
p = strchr(p, ':');
if (p == NULL || strlen(p) <= 1)
pg_fatal("%d: controldata retrieval problem\n", __LINE__);
p++; /* removing ':' char */
cluster->controldata.chkpnt_nxtmxoff = str2uint(p);
got_mxoff = true;
}
else if ((p = strstr(bufin, "Maximum data alignment:")) != NULL)
{
p = strchr(p, ':');
if (p == NULL || strlen(p) <= 1)
pg_fatal("%d: controldata retrieval problem\n", __LINE__);
p++; /* removing ':' char */
cluster->controldata.align = str2uint(p);
got_align = true;
}
else if ((p = strstr(bufin, "Database block size:")) != NULL)
{
p = strchr(p, ':');
if (p == NULL || strlen(p) <= 1)
pg_fatal("%d: controldata retrieval problem\n", __LINE__);
p++; /* removing ':' char */
cluster->controldata.blocksz = str2uint(p);
got_blocksz = true;
}
else if ((p = strstr(bufin, "Blocks per segment of large relation:")) != NULL)
{
p = strchr(p, ':');
if (p == NULL || strlen(p) <= 1)
pg_fatal("%d: controldata retrieval problem\n", __LINE__);
p++; /* removing ':' char */
cluster->controldata.largesz = str2uint(p);
got_largesz = true;
}
else if ((p = strstr(bufin, "WAL block size:")) != NULL)
{
p = strchr(p, ':');
if (p == NULL || strlen(p) <= 1)
pg_fatal("%d: controldata retrieval problem\n", __LINE__);
p++; /* removing ':' char */
cluster->controldata.walsz = str2uint(p);
got_walsz = true;
}
else if ((p = strstr(bufin, "Bytes per WAL segment:")) != NULL)
{
p = strchr(p, ':');
if (p == NULL || strlen(p) <= 1)
pg_fatal("%d: controldata retrieval problem\n", __LINE__);
p++; /* removing ':' char */
cluster->controldata.walseg = str2uint(p);
got_walseg = true;
}
else if ((p = strstr(bufin, "Maximum length of identifiers:")) != NULL)
{
p = strchr(p, ':');
if (p == NULL || strlen(p) <= 1)
pg_fatal("%d: controldata retrieval problem\n", __LINE__);
p++; /* removing ':' char */
cluster->controldata.ident = str2uint(p);
got_ident = true;
}
else if ((p = strstr(bufin, "Maximum columns in an index:")) != NULL)
{
p = strchr(p, ':');
if (p == NULL || strlen(p) <= 1)
pg_fatal("%d: controldata retrieval problem\n", __LINE__);
p++; /* removing ':' char */
cluster->controldata.index = str2uint(p);
got_index = true;
}
else if ((p = strstr(bufin, "Maximum size of a TOAST chunk:")) != NULL)
{
p = strchr(p, ':');
if (p == NULL || strlen(p) <= 1)
pg_fatal("%d: controldata retrieval problem\n", __LINE__);
p++; /* removing ':' char */
cluster->controldata.toast = str2uint(p);
got_toast = true;
}
else if ((p = strstr(bufin, "Date/time type storage:")) != NULL)
{
p = strchr(p, ':');
if (p == NULL || strlen(p) <= 1)
pg_fatal("%d: controldata retrieval problem\n", __LINE__);
p++; /* removing ':' char */
cluster->controldata.date_is_int = strstr(p, "64-bit integers") != NULL;
got_date_is_int = true;
}
else if ((p = strstr(bufin, "Float8 argument passing:")) != NULL)
{
p = strchr(p, ':');
if (p == NULL || strlen(p) <= 1)
pg_fatal("%d: controldata retrieval problem\n", __LINE__);
p++; /* removing ':' char */
/* used later for contrib check */
cluster->controldata.float8_pass_by_value = strstr(p, "by value") != NULL;
got_float8_pass_by_value = true;
}
else if ((p = strstr(bufin, "checksum")) != NULL)
{
p = strchr(p, ':');
if (p == NULL || strlen(p) <= 1)
pg_fatal("%d: controldata retrieval problem\n", __LINE__);
p++; /* removing ':' char */
/* used later for contrib check */
cluster->controldata.data_checksum_version = str2uint(p);
got_data_checksum_version = true;
}
/* In pre-8.4 only */
else if ((p = strstr(bufin, "LC_COLLATE:")) != NULL)
{
p = strchr(p, ':');
if (p == NULL || strlen(p) <= 1)
pg_fatal("%d: controldata retrieval problem\n", __LINE__);
p++; /* removing ':' char */
/* skip leading spaces and remove trailing newline */
p += strspn(p, " ");
if (strlen(p) > 0 && *(p + strlen(p) - 1) == '\n')
*(p + strlen(p) - 1) = '\0';
cluster->controldata.lc_collate = pg_strdup(p);
}
/* In pre-8.4 only */
else if ((p = strstr(bufin, "LC_CTYPE:")) != NULL)
{
p = strchr(p, ':');
if (p == NULL || strlen(p) <= 1)
pg_fatal("%d: controldata retrieval problem\n", __LINE__);
p++; /* removing ':' char */
/* skip leading spaces and remove trailing newline */
p += strspn(p, " ");
if (strlen(p) > 0 && *(p + strlen(p) - 1) == '\n')
*(p + strlen(p) - 1) = '\0';
cluster->controldata.lc_ctype = pg_strdup(p);
}
}
if (output)
pclose(output);
/*
* Restore environment variables
*/
pg_putenv("LC_COLLATE", lc_collate);
pg_putenv("LC_CTYPE", lc_ctype);
pg_putenv("LC_MONETARY", lc_monetary);
pg_putenv("LC_NUMERIC", lc_numeric);
pg_putenv("LC_TIME", lc_time);
pg_putenv("LANG", lang);
pg_putenv("LANGUAGE", language);
pg_putenv("LC_ALL", lc_all);
pg_putenv("LC_MESSAGES", lc_messages);
pg_free(lc_collate);
pg_free(lc_ctype);
pg_free(lc_monetary);
pg_free(lc_numeric);
pg_free(lc_time);
pg_free(lang);
pg_free(language);
pg_free(lc_all);
pg_free(lc_messages);
/*
* Before 9.3, pg_resetxlog reported the xlogid and segno of the first log
* file after reset as separate lines. Starting with 9.3, it reports the
* WAL file name. If the old cluster is older than 9.3, we construct the
* WAL file name from the xlogid and segno.
*/
if (GET_MAJOR_VERSION(cluster->major_version) <= 902)
{
if (got_log_id && got_log_seg)
{
snprintf(cluster->controldata.nextxlogfile, 25, "%08X%08X%08X",
tli, logid, segno);
got_nextxlogfile = true;
}
}
/* verify that we got all the mandatory pg_control data */
if (!got_xid || !got_oid ||
!got_multi || !got_mxoff ||
(!got_oldestmulti &&
cluster->controldata.cat_ver >= MULTIXACT_FORMATCHANGE_CAT_VER) ||
(!live_check && !got_nextxlogfile) ||
!got_tli ||
!got_align || !got_blocksz || !got_largesz || !got_walsz ||
!got_walseg || !got_ident || !got_index || !got_toast ||
!got_date_is_int || !got_float8_pass_by_value || !got_data_checksum_version)
{
pg_log(PG_REPORT,
"The %s cluster lacks some required control information:\n",
CLUSTER_NAME(cluster));
if (!got_xid)
pg_log(PG_REPORT, " checkpoint next XID\n");
if (!got_oid)
pg_log(PG_REPORT, " latest checkpoint next OID\n");
if (!got_multi)
pg_log(PG_REPORT, " latest checkpoint next MultiXactId\n");
if (!got_mxoff)
pg_log(PG_REPORT, " latest checkpoint next MultiXactOffset\n");
if (!got_oldestmulti &&
cluster->controldata.cat_ver >= MULTIXACT_FORMATCHANGE_CAT_VER)
pg_log(PG_REPORT, " latest checkpoint oldest MultiXactId\n");
if (!live_check && !got_nextxlogfile)
pg_log(PG_REPORT, " first WAL segment after reset\n");
if (!got_tli)
pg_log(PG_REPORT, " latest checkpoint timeline ID\n");
if (!got_align)
pg_log(PG_REPORT, " maximum alignment\n");
if (!got_blocksz)
pg_log(PG_REPORT, " block size\n");
if (!got_largesz)
pg_log(PG_REPORT, " large relation segment size\n");
if (!got_walsz)
pg_log(PG_REPORT, " WAL block size\n");
if (!got_walseg)
pg_log(PG_REPORT, " WAL segment size\n");
if (!got_ident)
pg_log(PG_REPORT, " maximum identifier length\n");
if (!got_index)
pg_log(PG_REPORT, " maximum number of indexed columns\n");
if (!got_toast)
pg_log(PG_REPORT, " maximum TOAST chunk size\n");
if (!got_date_is_int)
pg_log(PG_REPORT, " dates/times are integers?\n");
/* value added in Postgres 8.4 */
if (!got_float8_pass_by_value)
pg_log(PG_REPORT, " float8 argument passing method\n");
/* value added in Postgres 9.3 */
if (!got_data_checksum_version)
pg_log(PG_REPORT, " data checksum version\n");
pg_fatal("Cannot continue without required control information, terminating\n");
}
}
/*
* check_control_data()
*
* check to make sure the control data settings are compatible
*/
void
check_control_data(ControlData *oldctrl,
ControlData *newctrl)
{
if (oldctrl->align == 0 || oldctrl->align != newctrl->align)
pg_fatal("old and new pg_controldata alignments are invalid or do not match\n"
"Likely one cluster is a 32-bit install, the other 64-bit\n");
if (oldctrl->blocksz == 0 || oldctrl->blocksz != newctrl->blocksz)
pg_fatal("old and new pg_controldata block sizes are invalid or do not match\n");
if (oldctrl->largesz == 0 || oldctrl->largesz != newctrl->largesz)
pg_fatal("old and new pg_controldata maximum relation segement sizes are invalid or do not match\n");
if (oldctrl->walsz == 0 || oldctrl->walsz != newctrl->walsz)
pg_fatal("old and new pg_controldata WAL block sizes are invalid or do not match\n");
if (oldctrl->walseg == 0 || oldctrl->walseg != newctrl->walseg)
pg_fatal("old and new pg_controldata WAL segment sizes are invalid or do not match\n");
if (oldctrl->ident == 0 || oldctrl->ident != newctrl->ident)
pg_fatal("old and new pg_controldata maximum identifier lengths are invalid or do not match\n");
if (oldctrl->index == 0 || oldctrl->index != newctrl->index)
pg_fatal("old and new pg_controldata maximum indexed columns are invalid or do not match\n");
if (oldctrl->toast == 0 || oldctrl->toast != newctrl->toast)
pg_fatal("old and new pg_controldata maximum TOAST chunk sizes are invalid or do not match\n");
if (oldctrl->date_is_int != newctrl->date_is_int)
{
pg_log(PG_WARNING,
"\nOld and new pg_controldata date/time storage types do not match.\n");
/*
* This is a common 8.3 -> 8.4 upgrade problem, so we are more verbose
*/
pg_fatal("You will need to rebuild the new server with configure option\n"
"--disable-integer-datetimes or get server binaries built with those\n"
"options.\n");
}
/*
* We might eventually allow upgrades from checksum to no-checksum
* clusters.
*/
if (oldctrl->data_checksum_version != newctrl->data_checksum_version)
{
pg_fatal("old and new pg_controldata checksum versions are invalid or do not match\n");
}
}
void
disable_old_cluster(void)
{
char old_path[MAXPGPATH],
new_path[MAXPGPATH];
/* rename pg_control so old server cannot be accidentally started */
prep_status("Adding \".old\" suffix to old global/pg_control");
snprintf(old_path, sizeof(old_path), "%s/global/pg_control", old_cluster.pgdata);
snprintf(new_path, sizeof(new_path), "%s/global/pg_control.old", old_cluster.pgdata);
if (pg_mv_file(old_path, new_path) != 0)
pg_fatal("Unable to rename %s to %s.\n", old_path, new_path);
check_ok();
pg_log(PG_REPORT, "\n"
"If you want to start the old cluster, you will need to remove\n"
"the \".old\" suffix from %s/global/pg_control.old.\n"
"Because \"link\" mode was used, the old cluster cannot be safely\n"
"started once the new cluster has been started.\n\n", old_cluster.pgdata);
}
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