Make pg_regress a tad simpler and more general-purpose by removing its

code to forcibly drop regressuser[1-4] and regressgroup[1-2].  Instead,
let the privileges.sql test do that for itself (this is made easy by
the recent addition of DROP ROLE IF EXISTS).  Per a recent patch proposed
by Joachim Wieland --- the rest of his patch is superseded by the
rewrite into C, but this is a good idea we should adopt.

src/test/regress/expected/privileges.out

 --
 -- Test access privileges
 --
+-- Clean up in case a prior regression run failed
+-- Suppress NOTICE messages when users/groups don't exist
+SET client_min_messages TO 'error';
+DROP ROLE IF EXISTS regressgroup1;
+DROP ROLE IF EXISTS regressgroup2;
+DROP ROLE IF EXISTS regressuser1;
+DROP ROLE IF EXISTS regressuser2;
+DROP ROLE IF EXISTS regressuser3;
+DROP ROLE IF EXISTS regressuser4;
+RESET client_min_messages;
+-- test proper begins here
 CREATE USER regressuser1;
 CREATE USER regressuser2;
 CREATE USER regressuser3;

src/test/regress/pg_regress.sh

 #! /bin/sh
-# $PostgreSQL: pgsql/src/test/regress/pg_regress.sh,v 1.64 2006/01/05 03:01:38 momjian Exp $
+# $PostgreSQL: pgsql/src/test/regress/pg_regress.sh,v 1.65 2006/07/18 00:32:41 tgl Exp $
 
 me=`basename $0`
 : ${TMPDIR=/tmp}
@@ -555,18 +555,6 @@ if [ $? -ne 0 ]; then
 fi
 
 
-# ----------
-# Remove regressuser* and regressgroup* user accounts.
-# ----------
-
-message "dropping regression test user accounts"
-"$bindir/psql" -q -X $psql_options -c 'DROP GROUP regressgroup1; DROP GROUP regressgroup2; DROP USER regressuser1, regressuser2, regressuser3, regressuser4;' $dbname 2>/dev/null
-if [ $? -eq 2 ]; then
-    echo "$me: could not drop user accounts"
-    (exit 2); exit
-fi
-
-
 # ----------
 # Install any requested PL languages
 # ----------

src/test/regress/sql/privileges.sql

@@ -2,6 +2,23 @@
 -- Test access privileges
 --
 
+-- Clean up in case a prior regression run failed
+
+-- Suppress NOTICE messages when users/groups don't exist
+SET client_min_messages TO 'error';
+
+DROP ROLE IF EXISTS regressgroup1;
+DROP ROLE IF EXISTS regressgroup2;
+
+DROP ROLE IF EXISTS regressuser1;
+DROP ROLE IF EXISTS regressuser2;
+DROP ROLE IF EXISTS regressuser3;
+DROP ROLE IF EXISTS regressuser4;
+
+RESET client_min_messages;
+
+-- test proper begins here
+
 CREATE USER regressuser1;
 CREATE USER regressuser2;
 CREATE USER regressuser3;