Remove pg_upgrade support for upgrading from pre-9.2 servers.

Per discussion, we'll limit support for old servers to those branches
that can still be built easily on modern platforms, which as of now
is 9.2 and up.

Discussion: https://postgr.es/m/2923349.1634942313@sss.pgh.pa.us

Author: tglsfdc

doc/src/sgml/ref/pgupgrade.sgml

@@ -68,7 +68,7 @@ PostgreSQL documentation
  </para>
 
   <para>
-   pg_upgrade supports upgrades from 8.4.X and later to the current
+   pg_upgrade supports upgrades from 9.2.X and later to the current
    major release of <productname>PostgreSQL</productname>, including snapshot and beta releases.
   </para>
  </refsect1>
@@ -800,21 +800,6 @@ psql --username=postgres --file=script.sql postgres
    (<type>regclass</type>, <type>regrole</type>, and <type>regtype</type> can be upgraded.)
   </para>
 
-  <para>
-   If you are upgrading a pre-<productname>PostgreSQL</productname> 9.2 cluster
-   that uses a configuration-file-only directory, you must pass the
-   real data directory location to <application>pg_upgrade</application>, and
-   pass the configuration directory location to the server, e.g.,
-   <literal>-d /real-data-directory -o '-D /configuration-directory'</literal>.
-  </para>
-
-  <para>
-   If using a pre-9.1 old server that is using a non-default Unix-domain
-   socket directory or a default that differs from the default of the
-   new cluster, set <envar>PGHOST</envar> to point to the old server's socket
-   location.  (This is not relevant on Windows.)
-  </para>
-
   <para>
    If you want to use link mode and you do not want your old cluster
    to be modified when the new cluster is started, consider using the clone mode.

src/bin/pg_upgrade/check.c

@@ -159,10 +159,6 @@ check_and_dump_old_cluster(bool live_check)
 	if (GET_MAJOR_VERSION(old_cluster.major_version) <= 903)
 		old_9_3_check_for_line_data_type_usage(&old_cluster);
 
-	/* Pre-PG 9.0 had no large object permissions */
-	if (GET_MAJOR_VERSION(old_cluster.major_version) <= 804)
-		new_9_0_populate_pg_largeobject_metadata(&old_cluster, true);
-
 	/*
 	 * While not a check option, we do this now because this is the only time
 	 * the old server is running.
@@ -233,10 +229,6 @@ issue_warnings_and_set_wal_level(void)
 	 */
 	start_postmaster(&new_cluster, true);
 
-	/* Create dummy large object permissions for old < PG 9.0? */
-	if (GET_MAJOR_VERSION(old_cluster.major_version) <= 804)
-		new_9_0_populate_pg_largeobject_metadata(&new_cluster, false);
-
 	/* Reindex hash indexes for old < 10.0 */
 	if (GET_MAJOR_VERSION(old_cluster.major_version) <= 906)
 		old_9_6_invalidate_hash_indexes(&new_cluster, false);
@@ -295,8 +287,8 @@ check_cluster_versions(void)
 	 * upgrades
 	 */
 
-	if (GET_MAJOR_VERSION(old_cluster.major_version) < 804)
-		pg_fatal("This utility can only upgrade from PostgreSQL version 8.4 and later.\n");
+	if (GET_MAJOR_VERSION(old_cluster.major_version) < 902)
+		pg_fatal("This utility can only upgrade from PostgreSQL version 9.2 and later.\n");
 
 	/* Only current PG version is supported as a target */
 	if (GET_MAJOR_VERSION(new_cluster.major_version) != GET_MAJOR_VERSION(PG_VERSION_NUM))
@@ -331,12 +323,6 @@ check_cluster_compatibility(bool live_check)
 	get_control_data(&new_cluster, false);
 	check_control_data(&old_cluster.controldata, &new_cluster.controldata);
 
-	/* We read the real port number for PG >= 9.1 */
-	if (live_check && GET_MAJOR_VERSION(old_cluster.major_version) <= 900 &&
-		old_cluster.port == DEF_PGUPORT)
-		pg_fatal("When checking a pre-PG 9.1 live old server, "
-				 "you must specify the old server's port number.\n");
-
 	if (live_check && old_cluster.port == new_cluster.port)
 		pg_fatal("When checking a live server, "
 				 "the old and new port numbers must be different.\n");
@@ -479,11 +465,6 @@ check_databases_are_compatible(void)
  * they do, it would cause an error while restoring global objects.
  * This allows the failure to be detected at check time, rather than
  * during schema restore.
- *
- * Note, v8.4 has no tablespace_suffix, which is fine so long as the
- * version being upgraded *to* has a suffix, since it's not allowed
- * to pg_upgrade from a version to the same version if tablespaces are
- * in use.
  */
 static void
 check_for_new_tablespace_dir(ClusterInfo *new_cluster)
@@ -597,11 +578,6 @@ create_script_for_old_cluster_deletion(char **deletion_script_file_name)
 			int			dbnum;
 
 			fprintf(script, "\n");
-			/* remove PG_VERSION? */
-			if (GET_MAJOR_VERSION(old_cluster.major_version) <= 804)
-				fprintf(script, RM_CMD " %s%cPG_VERSION\n",
-						fix_path_separator(os_info.old_tablespaces[tblnum]),
-						PATH_SEPARATOR);
 
 			for (dbnum = 0; dbnum < old_cluster.dbarr.ndbs; dbnum++)
 				fprintf(script, RMDIR_CMD " %c%s%c%u%c\n", PATH_QUOTE,

src/bin/pg_upgrade/info.c

@@ -118,15 +118,9 @@ gen_db_file_maps(DbInfo *old_db, DbInfo *new_db,
 		 * Verify that rels of same OID have same name.  The namespace name
 		 * should always match, but the relname might not match for TOAST
 		 * tables (and, therefore, their indexes).
-		 *
-		 * TOAST table names initially match the heap pg_class oid, but
-		 * pre-9.0 they can change during certain commands such as CLUSTER, so
-		 * don't insist on a match if old cluster is < 9.0.
 		 */
 		if (strcmp(old_rel->nspname, new_rel->nspname) != 0 ||
-			(strcmp(old_rel->relname, new_rel->relname) != 0 &&
-			 (GET_MAJOR_VERSION(old_cluster.major_version) >= 900 ||
-			  strcmp(old_rel->nspname, "pg_toast") != 0)))
+			strcmp(old_rel->relname, new_rel->relname) != 0)
 		{
 			pg_log(PG_WARNING, "Relation names for OID %u in database \"%s\" do not match: "
 				   "old name \"%s.%s\", new name \"%s.%s\"\n",
@@ -352,16 +346,13 @@ get_db_infos(ClusterInfo *cluster)
 
 	snprintf(query, sizeof(query),
 			 "SELECT d.oid, d.datname, d.encoding, d.datcollate, d.datctype, "
-			 "%s AS spclocation "
+			 "pg_catalog.pg_tablespace_location(t.oid) AS spclocation "
 			 "FROM pg_catalog.pg_database d "
 			 " LEFT OUTER JOIN pg_catalog.pg_tablespace t "
 			 " ON d.dattablespace = t.oid "
 			 "WHERE d.datallowconn = true "
 	/* we don't preserve pg_database.oid so we sort by name */
-			 "ORDER BY 2",
-	/* 9.2 removed the spclocation column */
-			 (GET_MAJOR_VERSION(cluster->major_version) <= 901) ?
-			 "t.spclocation" : "pg_catalog.pg_tablespace_location(t.oid)");
+			 "ORDER BY 2");
 
 	res = executeQueryOrDie(conn, "%s", query);
 
@@ -492,7 +483,8 @@ get_rel_infos(ClusterInfo *cluster, DbInfo *dbinfo)
 	 */
 	snprintf(query + strlen(query), sizeof(query) - strlen(query),
 			 "SELECT all_rels.*, n.nspname, c.relname, "
-			 "  c.relfilenode, c.reltablespace, %s "
+			 "  c.relfilenode, c.reltablespace, "
+			 "  pg_catalog.pg_tablespace_location(t.oid) AS spclocation "
 			 "FROM (SELECT * FROM regular_heap "
 			 "      UNION ALL "
 			 "      SELECT * FROM toast_heap "
@@ -504,11 +496,7 @@ get_rel_infos(ClusterInfo *cluster, DbInfo *dbinfo)
 			 "     ON c.relnamespace = n.oid "
 			 "  LEFT OUTER JOIN pg_catalog.pg_tablespace t "
 			 "     ON c.reltablespace = t.oid "
-			 "ORDER BY 1;",
-	/* 9.2 removed the pg_tablespace.spclocation column */
-			 (GET_MAJOR_VERSION(cluster->major_version) >= 902) ?
-			 "pg_catalog.pg_tablespace_location(t.oid) AS spclocation" :
-			 "t.spclocation");
+			 "ORDER BY 1;");
 
 	res = executeQueryOrDie(conn, "%s", query);
 

src/bin/pg_upgrade/pg_upgrade.h

@@ -89,19 +89,7 @@ extern char *output_files[];
 
 
 /*
- * postmaster/postgres -b (binary_upgrade) flag added during PG 9.1
- * development
- */
-#define BINARY_UPGRADE_SERVER_FLAG_CAT_VER 201104251
-
-/*
- *	Visibility map changed with this 9.2 commit,
- *	8f9fe6edce358f7904e0db119416b4d1080a83aa; pick later catalog version.
- */
-#define VISIBILITY_MAP_CRASHSAFE_CAT_VER 201107031
-
-/*
- * The format of visibility map is changed with this 9.6 commit,
+ * The format of visibility map was changed with this 9.6 commit.
  */
 #define VISIBILITY_MAP_FROZEN_BIT_CAT_VER 201603011
 
@@ -447,8 +435,6 @@ bool		check_for_data_types_usage(ClusterInfo *cluster,
 bool		check_for_data_type_usage(ClusterInfo *cluster,
 									  const char *type_name,
 									  const char *output_path);
-void		new_9_0_populate_pg_largeobject_metadata(ClusterInfo *cluster,
-													 bool check_mode);
 void		old_9_3_check_for_line_data_type_usage(ClusterInfo *cluster);
 void		old_9_6_check_for_unknown_data_type_usage(ClusterInfo *cluster);
 void		old_9_6_invalidate_hash_indexes(ClusterInfo *cluster,

src/bin/pg_upgrade/relfilenode.c

@@ -137,17 +137,8 @@ static void
 transfer_single_new_db(FileNameMap *maps, int size, char *old_tablespace)
 {
 	int			mapnum;
-	bool		vm_crashsafe_match = true;
 	bool		vm_must_add_frozenbit = false;
 
-	/*
-	 * Do the old and new cluster disagree on the crash-safetiness of the vm
-	 * files?  If so, do not copy them.
-	 */
-	if (old_cluster.controldata.cat_ver < VISIBILITY_MAP_CRASHSAFE_CAT_VER &&
-		new_cluster.controldata.cat_ver >= VISIBILITY_MAP_CRASHSAFE_CAT_VER)
-		vm_crashsafe_match = false;
-
 	/*
 	 * Do we need to rewrite visibilitymap?
 	 */
@@ -167,8 +158,7 @@ transfer_single_new_db(FileNameMap *maps, int size, char *old_tablespace)
 			 * Copy/link any fsm and vm files, if they exist
 			 */
 			transfer_relfile(&maps[mapnum], "_fsm", vm_must_add_frozenbit);
-			if (vm_crashsafe_match)
-				transfer_relfile(&maps[mapnum], "_vm", vm_must_add_frozenbit);
+			transfer_relfile(&maps[mapnum], "_vm", vm_must_add_frozenbit);
 		}
 	}
 }

src/bin/pg_upgrade/server.c

@@ -227,14 +227,7 @@ start_postmaster(ClusterInfo *cluster, bool report_and_exit_on_error)
 #endif
 
 	/*
-	 * Since PG 9.1, we have used -b to disable autovacuum.  For earlier
-	 * releases, setting autovacuum=off disables cleanup vacuum and analyze,
-	 * but freeze vacuums can still happen, so we set
-	 * autovacuum_freeze_max_age to its maximum.
-	 * (autovacuum_multixact_freeze_max_age was introduced after 9.1, so there
-	 * is no need to set that.)  We assume all datfrozenxid and relfrozenxid
-	 * values are less than a gap of 2000000000 from the current xid counter,
-	 * so autovacuum will not touch them.
+	 * Use -b to disable autovacuum.
 	 *
 	 * Turn off durability requirements to improve object creation speed, and
 	 * we only modify the new cluster, so only use it there.  If there is a
@@ -245,11 +238,8 @@ start_postmaster(ClusterInfo *cluster, bool report_and_exit_on_error)
 	 * vacuumdb --freeze actually freezes the tuples.
 	 */
 	snprintf(cmd, sizeof(cmd),
-			 "\"%s/pg_ctl\" -w -l \"%s\" -D \"%s\" -o \"-p %d%s%s %s%s\" start",
+			 "\"%s/pg_ctl\" -w -l \"%s\" -D \"%s\" -o \"-p %d -b%s %s%s\" start",
 			 cluster->bindir, SERVER_LOG_FILE, cluster->pgconfig, cluster->port,
-			 (cluster->controldata.cat_ver >=
-			  BINARY_UPGRADE_SERVER_FLAG_CAT_VER) ? " -b" :
-			 " -c autovacuum=off -c autovacuum_freeze_max_age=2000000000",
 			 (cluster == &new_cluster) ?
 			 " -c synchronous_commit=off -c fsync=off -c full_page_writes=off -c vacuum_defer_cleanup_age=0" : "",
 			 cluster->pgopts ? cluster->pgopts : "", socket_string);

src/bin/pg_upgrade/tablespace.c

@@ -46,13 +46,10 @@ get_tablespace_paths(void)
 	char		query[QUERY_ALLOC];
 
 	snprintf(query, sizeof(query),
-			 "SELECT	%s "
+			 "SELECT pg_catalog.pg_tablespace_location(oid) AS spclocation "
 			 "FROM	pg_catalog.pg_tablespace "
 			 "WHERE	spcname != 'pg_default' AND "
-			 "		spcname != 'pg_global'",
-	/* 9.2 removed the spclocation column */
-			 (GET_MAJOR_VERSION(old_cluster.major_version) <= 901) ?
-			 "spclocation" : "pg_catalog.pg_tablespace_location(oid) AS spclocation");
+			 "		spcname != 'pg_global'");
 
 	res = executeQueryOrDie(conn, "%s", query);
 
@@ -105,15 +102,10 @@ get_tablespace_paths(void)
 static void
 set_tablespace_directory_suffix(ClusterInfo *cluster)
 {
-	if (GET_MAJOR_VERSION(cluster->major_version) <= 804)
-		cluster->tablespace_suffix = pg_strdup("");
-	else
-	{
-		/* This cluster has a version-specific subdirectory */
+	/* This cluster has a version-specific subdirectory */
 
-		/* The leading slash is needed to start a new directory. */
-		cluster->tablespace_suffix = psprintf("/PG_%s_%d",
-											  cluster->major_version_str,
-											  cluster->controldata.cat_ver);
-	}
+	/* The leading slash is needed to start a new directory. */
+	cluster->tablespace_suffix = psprintf("/PG_%s_%d",
+										  cluster->major_version_str,
+										  cluster->controldata.cat_ver);
 }

src/bin/pg_upgrade/test.sh

@@ -202,9 +202,6 @@ if "$MAKE" -C "$oldsrc" installcheck-parallel; then
 		# update references to old source tree's regress.so etc
 		fix_sql=""
 		case $oldpgversion in
-			804??)
-				fix_sql="UPDATE pg_proc SET probin = replace(probin::text, '$oldsrc', '$newsrc')::bytea WHERE probin LIKE '$oldsrc%';"
-				;;
 			*)
 				fix_sql="UPDATE pg_proc SET probin = replace(probin, '$oldsrc', '$newsrc') WHERE probin LIKE '$oldsrc%';"
 				;;