From 90c08ed11332b766769b2e5ba114fb7ecb34e401 Mon Sep 17 00:00:00 2001
From: Andrew Dunstan <andrew@dunslane.net>
Date: Wed, 8 Dec 2021 10:21:35 -0500
Subject: [PATCH] Check that we have a working tar before trying to use it

Issue exposed by commit edc2332550 and the buildfarm.

Backpatch to release 14 where this usage started.
---
 src/bin/pg_basebackup/t/010_pg_basebackup.pl | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/bin/pg_basebackup/t/010_pg_basebackup.pl b/src/bin/pg_basebackup/t/010_pg_basebackup.pl
index bde31b3c03d..21c92fe60d3 100644
--- a/src/bin/pg_basebackup/t/010_pg_basebackup.pl
+++ b/src/bin/pg_basebackup/t/010_pg_basebackup.pl
@@ -268,7 +268,8 @@ SKIP:
 {
 	my $tar = $ENV{TAR};
 	skip "no tar program available", 1
-	  if (!defined $tar || $tar eq '');
+	  if (!defined $tar || $tar eq ''
+		  || system_log($tar, '--version') != 0);
 
 	my $node2 = get_new_node('replica');
 
-- 
2.39.5