From 115a7075633899408fc1ab85f3bc2e5deeaa5e45 Mon Sep 17 00:00:00 2001
From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Thu, 9 Nov 2017 11:30:30 -0500
Subject: [PATCH] Fix bogus logic for checking executables' versions within
 pg_upgrade.

Somebody messed up a refactoring here.  As it stood, we'd check pg_ctl's
--version output twice for each cluster.  Worse, the first check for the
new cluster's version happened before we'd done any validate_exec checks
there, breaking the check ordering the code intended.

A. Akenteva

Discussion: https://postgr.es/m/f9266a85d918a3cf3a386b5148aee666@postgrespro.ru
---
 src/bin/pg_upgrade/exec.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/src/bin/pg_upgrade/exec.c b/src/bin/pg_upgrade/exec.c
index 59ddc16d6b8..810a5a0c3c5 100644
--- a/src/bin/pg_upgrade/exec.c
+++ b/src/bin/pg_upgrade/exec.c
@@ -382,12 +382,11 @@ check_bin_dir(ClusterInfo *cluster)
 	validate_exec(cluster->bindir, "pg_ctl");
 
 	/*
-	 * Fetch the binary versions after checking for the existence of pg_ctl,
-	 * this gives a correct error if the binary used itself for the version
-	 * fetching is broken.
+	 * Fetch the binary version after checking for the existence of pg_ctl.
+	 * This way we report a useful error if the pg_ctl binary used for version
+	 * fetching is missing/broken.
 	 */
-	get_bin_version(&old_cluster);
-	get_bin_version(&new_cluster);
+	get_bin_version(cluster);
 
 	/* pg_resetxlog has been renamed to pg_resetwal in version 10 */
 	if (GET_MAJOR_VERSION(cluster->bin_version) < 1000)
-- 
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