The attached, applied patch checks that the pg_upgrade user specified is
a super-user.  It also reports the error message when the post-pg_ctl
connection fails.

This was prompted by a private bug report from EnterpriseDB.

-- 
  Bruce Momjian  <br...@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + It's impossible for everything to be true. +
diff --git a/contrib/pg_upgrade/check.c b/contrib/pg_upgrade/check.c
new file mode 100644
index 35b178e..26dec39
*** a/contrib/pg_upgrade/check.c
--- b/contrib/pg_upgrade/check.c
*************** static void check_new_cluster_is_empty(v
*** 15,20 ****
--- 15,21 ----
  static void check_old_cluster_has_new_cluster_dbs(void);
  static void check_locale_and_encoding(ControlData *oldctrl,
  						  ControlData *newctrl);
+ static void check_is_super_user(ClusterInfo *cluster);
  static void check_for_isn_and_int8_passing_mismatch(ClusterInfo *cluster);
  static void check_for_reg_data_type_usage(ClusterInfo *cluster);
  
*************** check_old_cluster(bool live_check,
*** 63,69 ****
  	/*
  	 * Check for various failure cases
  	 */
! 
  	check_for_reg_data_type_usage(&old_cluster);
  	check_for_isn_and_int8_passing_mismatch(&old_cluster);
  
--- 64,70 ----
  	/*
  	 * Check for various failure cases
  	 */
! 	check_is_super_user(&old_cluster);
  	check_for_reg_data_type_usage(&old_cluster);
  	check_for_isn_and_int8_passing_mismatch(&old_cluster);
  
*************** create_script_for_old_cluster_deletion(
*** 473,478 ****
--- 474,505 ----
  
  
  /*
+  *	check_is_super_user()
+  *
+  *	Make sure we are the super-user.
+  */
+ static void
+ check_is_super_user(ClusterInfo *cluster)
+ {
+ 	PGresult   *res;
+ 	PGconn	   *conn = connectToServer(cluster, "template1");
+ 
+ 	/* Can't use pg_authid because only superusers can view it. */
+ 	res = executeQueryOrDie(conn,
+ 							"SELECT rolsuper "
+ 							"FROM pg_catalog.pg_roles "
+ 							"WHERE rolname = current_user");
+ 
+ 	if (PQntuples(res) != 1 || strcmp(PQgetvalue(res, 0, 0), "t") != 0)
+ 		pg_log(PG_FATAL, "the database user is not a superuser\n");
+ 
+ 	PQclear(res);
+ 
+ 	PQfinish(conn);
+ }
+ 
+ 
+ /*
   *	check_for_isn_and_int8_passing_mismatch()
   *
   *	/contrib/isn relies on data type int8, and in 8.4 int8 can now be passed
diff --git a/contrib/pg_upgrade/server.c b/contrib/pg_upgrade/server.c
new file mode 100644
index 9a55075..d6efe9a
*** a/contrib/pg_upgrade/server.c
--- b/contrib/pg_upgrade/server.c
*************** connectToServer(ClusterInfo *cluster, co
*** 27,33 ****
  
  	if (conn == NULL || PQstatus(conn) != CONNECTION_OK)
  	{
! 		pg_log(PG_REPORT, "Connection to database failed: %s\n",
  			   PQerrorMessage(conn));
  
  		if (conn)
--- 27,33 ----
  
  	if (conn == NULL || PQstatus(conn) != CONNECTION_OK)
  	{
! 		pg_log(PG_REPORT, "connection to database failed: %s\n",
  			   PQerrorMessage(conn));
  
  		if (conn)
*************** start_postmaster(ClusterInfo *cluster)
*** 189,195 ****
  	if ((conn = get_db_conn(cluster, "template1")) == NULL ||
  		PQstatus(conn) != CONNECTION_OK)
  	{
! 		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",
--- 189,197 ----
  	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",
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