postgresql/contrib/pg_upgrade/server.c
Bruce Momjian 81301b8578 Check that the pg_upgrade user specified is a super-user.
Also report the error message when the post-pg_ctl connection fails.

Per private bug report from EnterpriseDB.
2011-05-07 08:55:45 -04:00

291 lines
6.7 KiB
C

/*
* server.c
*
* database server functions
*
* Copyright (c) 2010-2011, PostgreSQL Global Development Group
* contrib/pg_upgrade/server.c
*/
#include "pg_upgrade.h"
static PGconn *get_db_conn(ClusterInfo *cluster, const char *db_name);
/*
* connectToServer()
*
* Connects to the desired database on the designated server.
* If the connection attempt fails, this function logs an error
* message and calls exit() to kill the program.
*/
PGconn *
connectToServer(ClusterInfo *cluster, const char *db_name)
{
PGconn *conn = get_db_conn(cluster, db_name);
if (conn == NULL || PQstatus(conn) != CONNECTION_OK)
{
pg_log(PG_REPORT, "connection to database failed: %s\n",
PQerrorMessage(conn));
if (conn)
PQfinish(conn);
printf("Failure, exiting\n");
exit(1);
}
return conn;
}
/*
* get_db_conn()
*
* get database connection
*/
static PGconn *
get_db_conn(ClusterInfo *cluster, const char *db_name)
{
char conn_opts[MAXPGPATH];
snprintf(conn_opts, sizeof(conn_opts),
"dbname = '%s' user = '%s' port = %d", db_name, os_info.user,
cluster->port);
return PQconnectdb(conn_opts);
}
/*
* executeQueryOrDie()
*
* Formats a query string from the given arguments and executes the
* resulting query. If the query fails, this function logs an error
* message and calls exit() to kill the program.
*/
PGresult *
executeQueryOrDie(PGconn *conn, const char *fmt,...)
{
static char command[8192];
va_list args;
PGresult *result;
ExecStatusType status;
va_start(args, fmt);
vsnprintf(command, sizeof(command), fmt, args);
va_end(args);
pg_log(PG_DEBUG, "executing: %s\n", command);
result = PQexec(conn, command);
status = PQresultStatus(result);
if ((status != PGRES_TUPLES_OK) && (status != PGRES_COMMAND_OK))
{
pg_log(PG_REPORT, "DB command failed\n%s\n%s\n", command,
PQerrorMessage(conn));
PQclear(result);
PQfinish(conn);
printf("Failure, exiting\n");
exit(1);
}
else
return result;
}
/*
* get_major_server_version()
*
* gets the version (in unsigned int form) for the given "datadir". Assumes
* that datadir is an absolute path to a valid pgdata directory. The version
* is retrieved by reading the PG_VERSION file.
*/
uint32
get_major_server_version(ClusterInfo *cluster)
{
const char *datadir = cluster->pgdata;
FILE *version_fd;
char ver_filename[MAXPGPATH];
int integer_version = 0;
int fractional_version = 0;
snprintf(ver_filename, sizeof(ver_filename), "%s/PG_VERSION", datadir);
if ((version_fd = fopen(ver_filename, "r")) == NULL)
return 0;
if (fscanf(version_fd, "%63s", cluster->major_version_str) == 0 ||
sscanf(cluster->major_version_str, "%d.%d", &integer_version,
&fractional_version) != 2)
pg_log(PG_FATAL, "could not get version from %s\n", datadir);
fclose(version_fd);
return (100 * integer_version + fractional_version) * 100;
}
static void
#ifdef HAVE_ATEXIT
stop_postmaster_atexit(void)
#else
stop_postmaster_on_exit(int exitstatus, void *arg)
#endif
{
stop_postmaster(true);
}
void
start_postmaster(ClusterInfo *cluster)
{
char cmd[MAXPGPATH];
PGconn *conn;
bool exit_hook_registered = false;
#ifndef WIN32
char *output_filename = log_opts.filename;
#else
/*
* On Win32, we can't send both pg_upgrade output and pg_ctl output to the
* same file because we get the error: "The process cannot access the file
* because it is being used by another process." so we have to send all
* other output to 'nul'.
*/
char *output_filename = DEVNULL;
#endif
if (!exit_hook_registered)
{
#ifdef HAVE_ATEXIT
atexit(stop_postmaster_atexit);
#else
on_exit(stop_postmaster_on_exit);
#endif
exit_hook_registered = true;
}
/*
* Using autovacuum=off disables cleanup vacuum and analyze, but freeze
* vacuums can still happen, so we set autovacuum_freeze_max_age to its
* maximum. We assume all datfrozenxid and relfrozen values are less than
* a gap of 2000000000 from the current xid counter, so autovacuum will
* not touch them.
*/
snprintf(cmd, sizeof(cmd),
SYSTEMQUOTE "\"%s/pg_ctl\" -w -l \"%s\" -D \"%s\" "
"-o \"-p %d %s\" start >> \"%s\" 2>&1" SYSTEMQUOTE,
cluster->bindir, output_filename, cluster->pgdata, cluster->port,
(cluster->controldata.cat_ver >=
BINARY_UPGRADE_SERVER_FLAG_CAT_VER) ? "-b" :
"-c autovacuum=off -c autovacuum_freeze_max_age=2000000000",
log_opts.filename);
exec_prog(true, "%s", cmd);
/* Check to see if we can connect to the server; if not, report it. */
if ((conn = get_db_conn(cluster, "template1")) == NULL ||
PQstatus(conn) != CONNECTION_OK)
{
pg_log(PG_REPORT, "\nconnection to database failed: %s\n",
PQerrorMessage(conn));
if (conn)
PQfinish(conn);
pg_log(PG_FATAL, "unable to connect to %s postmaster started with the command: %s\n"
"Perhaps pg_hba.conf was not set to \"trust\".\n",
CLUSTER_NAME(cluster), cmd);
}
PQfinish(conn);
os_info.running_cluster = cluster;
}
void
stop_postmaster(bool fast)
{
char cmd[MAXPGPATH];
const char *bindir;
const char *datadir;
#ifndef WIN32
char *output_filename = log_opts.filename;
#else
/* See comment in start_postmaster() about why win32 output is ignored. */
char *output_filename = DEVNULL;
#endif
if (os_info.running_cluster == &old_cluster)
{
bindir = old_cluster.bindir;
datadir = old_cluster.pgdata;
}
else if (os_info.running_cluster == &new_cluster)
{
bindir = new_cluster.bindir;
datadir = new_cluster.pgdata;
}
else
return; /* no cluster running */
snprintf(cmd, sizeof(cmd),
SYSTEMQUOTE "\"%s/pg_ctl\" -w -l \"%s\" -D \"%s\" %s stop >> "
"\"%s\" 2>&1" SYSTEMQUOTE,
bindir, output_filename, datadir, fast ? "-m fast" : "",
output_filename);
exec_prog(fast ? false : true, "%s", cmd);
os_info.running_cluster = NULL;
}
/*
* check_for_libpq_envvars()
*
* tests whether any libpq environment variables are set.
* Since pg_upgrade connects to both the old and the new server,
* it is potentially dangerous to have any of these set.
*
* If any are found, will log them and cancel.
*/
void
check_for_libpq_envvars(void)
{
PQconninfoOption *option;
PQconninfoOption *start;
bool found = false;
/* Get valid libpq env vars from the PQconndefaults function */
start = PQconndefaults();
for (option = start; option->keyword != NULL; option++)
{
if (option->envvar)
{
const char *value;
if (strcmp(option->envvar, "PGCLIENTENCODING") == 0)
continue;
value = getenv(option->envvar);
if (value && strlen(value) > 0)
{
found = true;
pg_log(PG_WARNING,
"libpq env var %-20s is currently set to: %s\n", option->envvar, value);
}
}
}
/* Free the memory that libpq allocated on our behalf */
PQconninfoFree(start);
if (found)
pg_log(PG_FATAL,
"libpq env vars have been found and listed above, please unset them for pg_upgrade\n");
}