postgresql/contrib/pg_upgrade/function.c
Bruce Momjian 2896c87ce4 Force pg_upgrade's to preserve pg_class.oid, not pg_class.relfilenode.
Toast tables have identical pg_class.oid and pg_class.relfilenode, but
for clarity it is good to preserve the pg_class.oid.

Update comments regarding what is preserved, and do some
variable/function renaming for clarity.
2011-01-07 21:26:13 -05:00

265 lines
6.8 KiB
C

/*
* function.c
*
* server-side function support
*
* Copyright (c) 2010-2011, PostgreSQL Global Development Group
* contrib/pg_upgrade/function.c
*/
#include "pg_upgrade.h"
#include "access/transam.h"
/*
* install_support_functions()
*
* pg_upgrade requires some support functions that enable it to modify
* backend behavior.
*/
void
install_support_functions(void)
{
int dbnum;
prep_status("Adding support functions to new cluster");
for (dbnum = 0; dbnum < new_cluster.dbarr.ndbs; dbnum++)
{
DbInfo *new_db = &new_cluster.dbarr.dbs[dbnum];
PGconn *conn = connectToServer(&new_cluster, new_db->db_name);
/* suppress NOTICE of dropped objects */
PQclear(executeQueryOrDie(conn,
"SET client_min_messages = warning;"));
PQclear(executeQueryOrDie(conn,
"DROP SCHEMA IF EXISTS binary_upgrade CASCADE;"));
PQclear(executeQueryOrDie(conn,
"RESET client_min_messages;"));
PQclear(executeQueryOrDie(conn,
"CREATE SCHEMA binary_upgrade;"));
PQclear(executeQueryOrDie(conn,
"CREATE OR REPLACE FUNCTION "
" binary_upgrade.set_next_pg_type_oid(OID) "
"RETURNS VOID "
"AS '$libdir/pg_upgrade_support' "
"LANGUAGE C STRICT;"));
PQclear(executeQueryOrDie(conn,
"CREATE OR REPLACE FUNCTION "
" binary_upgrade.set_next_array_pg_type_oid(OID) "
"RETURNS VOID "
"AS '$libdir/pg_upgrade_support' "
"LANGUAGE C STRICT;"));
PQclear(executeQueryOrDie(conn,
"CREATE OR REPLACE FUNCTION "
" binary_upgrade.set_next_toast_pg_type_oid(OID) "
"RETURNS VOID "
"AS '$libdir/pg_upgrade_support' "
"LANGUAGE C STRICT;"));
PQclear(executeQueryOrDie(conn,
"CREATE OR REPLACE FUNCTION "
" binary_upgrade.set_next_heap_pg_class_oid(OID) "
"RETURNS VOID "
"AS '$libdir/pg_upgrade_support' "
"LANGUAGE C STRICT;"));
PQclear(executeQueryOrDie(conn,
"CREATE OR REPLACE FUNCTION "
" binary_upgrade.set_next_index_pg_class_oid(OID) "
"RETURNS VOID "
"AS '$libdir/pg_upgrade_support' "
"LANGUAGE C STRICT;"));
PQclear(executeQueryOrDie(conn,
"CREATE OR REPLACE FUNCTION "
" binary_upgrade.set_next_toast_pg_class_oid(OID) "
"RETURNS VOID "
"AS '$libdir/pg_upgrade_support' "
"LANGUAGE C STRICT;"));
PQclear(executeQueryOrDie(conn,
"CREATE OR REPLACE FUNCTION "
" binary_upgrade.set_next_pg_enum_oid(OID) "
"RETURNS VOID "
"AS '$libdir/pg_upgrade_support' "
"LANGUAGE C STRICT;"));
PQfinish(conn);
}
check_ok();
}
void
uninstall_support_functions(void)
{
int dbnum;
prep_status("Removing support functions from new cluster");
for (dbnum = 0; dbnum < new_cluster.dbarr.ndbs; dbnum++)
{
DbInfo *new_db = &new_cluster.dbarr.dbs[dbnum];
PGconn *conn = connectToServer(&new_cluster, new_db->db_name);
/* suppress NOTICE of dropped objects */
PQclear(executeQueryOrDie(conn,
"SET client_min_messages = warning;"));
PQclear(executeQueryOrDie(conn,
"DROP SCHEMA binary_upgrade CASCADE;"));
PQclear(executeQueryOrDie(conn,
"RESET client_min_messages;"));
PQfinish(conn);
}
check_ok();
}
/*
* get_loadable_libraries()
*
* Fetch the names of all old libraries containing C-language functions.
* We will later check that they all exist in the new installation.
*/
void
get_loadable_libraries(void)
{
PGresult **ress;
int totaltups;
int dbnum;
ress = (PGresult **)
pg_malloc(old_cluster.dbarr.ndbs * sizeof(PGresult *));
totaltups = 0;
/* Fetch all library names, removing duplicates within each DB */
for (dbnum = 0; dbnum < old_cluster.dbarr.ndbs; dbnum++)
{
DbInfo *active_db = &old_cluster.dbarr.dbs[dbnum];
PGconn *conn = connectToServer(&old_cluster, active_db->db_name);
/* Fetch all libraries referenced in this DB */
ress[dbnum] = executeQueryOrDie(conn,
"SELECT DISTINCT probin "
"FROM pg_catalog.pg_proc "
"WHERE prolang = 13 /* C */ AND "
" probin IS NOT NULL AND "
" oid >= %u;",
FirstNormalObjectId);
totaltups += PQntuples(ress[dbnum]);
PQfinish(conn);
}
/* Allocate what's certainly enough space */
if (totaltups > 0)
os_info.libraries = (char **) pg_malloc(totaltups * sizeof(char *));
else
os_info.libraries = NULL;
/*
* Now remove duplicates across DBs. This is pretty inefficient code, but
* there probably aren't enough entries to matter.
*/
totaltups = 0;
for (dbnum = 0; dbnum < old_cluster.dbarr.ndbs; dbnum++)
{
PGresult *res = ress[dbnum];
int ntups;
int rowno;
ntups = PQntuples(res);
for (rowno = 0; rowno < ntups; rowno++)
{
char *lib = PQgetvalue(res, rowno, 0);
bool dup = false;
int n;
for (n = 0; n < totaltups; n++)
{
if (strcmp(lib, os_info.libraries[n]) == 0)
{
dup = true;
break;
}
}
if (!dup)
os_info.libraries[totaltups++] = pg_strdup(lib);
}
PQclear(res);
}
os_info.num_libraries = totaltups;
pg_free(ress);
}
/*
* check_loadable_libraries()
*
* Check that the new cluster contains all required libraries.
* We do this by actually trying to LOAD each one, thereby testing
* compatibility as well as presence.
*/
void
check_loadable_libraries(void)
{
PGconn *conn = connectToServer(&new_cluster, "template1");
int libnum;
FILE *script = NULL;
bool found = false;
char output_path[MAXPGPATH];
prep_status("Checking for presence of required libraries");
snprintf(output_path, sizeof(output_path), "%s/loadable_libraries.txt",
os_info.cwd);
for (libnum = 0; libnum < os_info.num_libraries; libnum++)
{
char *lib = os_info.libraries[libnum];
int llen = strlen(lib);
char *cmd = (char *) pg_malloc(8 + 2 * llen + 1);
PGresult *res;
strcpy(cmd, "LOAD '");
PQescapeStringConn(conn, cmd + 6, lib, llen, NULL);
strcat(cmd, "'");
res = PQexec(conn, cmd);
if (PQresultStatus(res) != PGRES_COMMAND_OK)
{
found = true;
if (script == NULL && (script = fopen(output_path, "w")) == NULL)
pg_log(PG_FATAL, "Could not create necessary file: %s\n",
output_path);
fprintf(script, "Failed to load library: %s\n%s\n",
lib,
PQerrorMessage(conn));
}
PQclear(res);
pg_free(cmd);
}
PQfinish(conn);
if (found)
{
fclose(script);
pg_log(PG_REPORT, "fatal\n");
pg_log(PG_FATAL,
"| Your installation references loadable libraries that are missing\n"
"| from the new installation. You can add these libraries to\n"
"| the new installation, or remove the functions using them\n"
"| from the old installation. A list of the problem libraries\n"
"| is in the file\n"
"| \"%s\".\n\n", output_path);
}
else
check_ok();
}