If wait_for_catchup fails under has_wal_read_bug, skip balance of test.

Test files should now ignore has_wal_read_bug() so long as
wait_for_catchup() is their only known way of reaching the bug.  That's
at least five files today, a number expected to grow over time.  This
commit removes skip logic from three.  By doing so, systems having the
bug regain the ability to catch other kinds of defects via those three
tests.  The other two, 002_databases.pl and 031_recovery_conflict.pl,
have been unprotected.  Back-patch to v15, where done_testing() first
became our standard.

Discussion: https://postgr.es/m/20221030031639.GA3082137@rfd.leadboat.com

1 files changed, 17 insertions, 2 deletions

diff --git a/src/test/perl/PostgreSQL/Test/Cluster.pm b/src/test/perl/PostgreSQL/Test/Cluster.pm
index d80134b26f3..d1017b746fc 100644
--- a/src/test/perl/PostgreSQL/Test/Cluster.pm
+++ b/src/test/perl/PostgreSQL/Test/Cluster.pm
@@ -2606,8 +2606,23 @@ sub wait_for_catchup
 	my $query = qq[SELECT '$target_lsn' <= ${mode}_lsn AND state = 'streaming'
          FROM pg_catalog.pg_stat_replication
          WHERE application_name IN ('$standby_name', 'walreceiver')];
-	$self->poll_query_until('postgres', $query)
-	  or croak "timed out waiting for catchup";
+	if (!$self->poll_query_until('postgres', $query))
+	{
+		if (PostgreSQL::Test::Utils::has_wal_read_bug)
+		{
+			# Mimic having skipped the test file.  If >0 tests have run, the
+			# harness won't accept a skip; otherwise, it won't accept
+			# done_testing().  Force a nonzero count by running one test.
+			ok(1, 'dummy test before skip for filesystem bug');
+			carp "skip rest: timed out waiting for catchup & filesystem bug";
+			done_testing();
+			exit 0;
+		}
+		else
+		{
+			croak "timed out waiting for catchup";
+		}
+	}
 	print "done\n";
 	return;
 }