pg_rewind: test new --write-recovery-conf functionality

Author: Alexey Kondratov
Reviewed-by: Paul Guo
Discussion: https://postgr.es/m/2f726102-3f1e-bf16-061e-501919473ace@postgrespro.ru

src/bin/pg_rewind/t/001_basic.pl

 use strict;
 use warnings;
 use TestLib;
-use Test::More tests => 10;
+use Test::More tests => 11;
 
 use FindBin;
 use lib $FindBin::RealBin;

src/bin/pg_rewind/t/002_databases.pl

 use strict;
 use warnings;
 use TestLib;
-use Test::More tests => 6;
+use Test::More tests => 7;
 
 use FindBin;
 use lib $FindBin::RealBin;

src/bin/pg_rewind/t/003_extrafiles.pl

@@ -3,7 +3,7 @@
 use strict;
 use warnings;
 use TestLib;
-use Test::More tests => 4;
+use Test::More tests => 5;
 
 use File::Find;
 

src/bin/pg_rewind/t/004_pg_xlog_symlink.pl

@@ -14,7 +14,7 @@ if ($windows_os)
 }
 else
 {
-	plan tests => 4;
+	plan tests => 5;
 }
 
 use FindBin;

src/bin/pg_rewind/t/RewindTest.pm

@@ -149,7 +149,7 @@ sub start_master
 
 	# Create custom role which is used to run pg_rewind, and adjust its
 	# permissions to the minimum necessary.
-	$node_master->psql(
+	$node_master->safe_psql(
 		'postgres', "
 		CREATE ROLE rewind_user LOGIN;
 		GRANT EXECUTE ON function pg_catalog.pg_ls_dir(text, boolean, boolean)
@@ -266,9 +266,19 @@ sub run_pg_rewind
 			[
 				'pg_rewind',                      "--debug",
 				"--source-server",                $standby_connstr,
-				"--target-pgdata=$master_pgdata", "--no-sync"
+				"--target-pgdata=$master_pgdata", "-R",
+				"--no-sync"
 			],
 			'pg_rewind remote');
+
+		# Check that standby.signal has been created.
+		ok(-e "$master_pgdata/standby.signal");
+
+		# Now, when pg_rewind apparently succeeded with minimal permissions,
+		# add REPLICATION privilege.  So we could test that new standby
+		# is able to connect to the new master with generated config.
+		$node_standby->safe_psql('postgres',
+			"ALTER ROLE rewind_user WITH REPLICATION;");
 	}
 	else
 	{
@@ -289,13 +299,15 @@ sub run_pg_rewind
 		"unable to set permissions for $master_pgdata/postgresql.conf");
 
 	# Plug-in rewound node to the now-promoted standby node
+	if ($test_mode ne "remote")
+	{
 		my $port_standby = $node_standby->port;
 		$node_master->append_conf(
 			'postgresql.conf', qq(
-primary_conninfo='port=$port_standby'
-));
+primary_conninfo='port=$port_standby'));
 
 		$node_master->set_standby_mode();
+	}
 
 	# Restart the master to check that rewind went correctly
 	$node_master->start;