From f002ceeae67113eb5a13af3c91aa2b86bc324565 Mon Sep 17 00:00:00 2001
From: Ian Barwick <ian.barwick@enterprisedb.com>
Date: Wed, 11 May 2022 15:25:38 +0900
Subject: [PATCH] Disable exclusive backup check in PostgreSQL 15 and later

Exclusive backup functionality was removed in core commit 39969e2a
so we can and must avoid checking for exclusive backups.
---
 dbutils.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/dbutils.c b/dbutils.c
index 791d7d7c..875a9697 100644
--- a/dbutils.c
+++ b/dbutils.c
@@ -2139,7 +2139,13 @@ server_in_exclusive_backup_mode(PGconn *conn)
 {
 	BackupState backup_state = BACKUP_STATE_UNKNOWN;
 	const char *sqlquery = "SELECT pg_catalog.pg_is_in_backup()";
-	PGresult   *res = PQexec(conn, sqlquery);
+	PGresult   *res = NULL;
+
+	/* Exclusive backup removed from PostgreSQL 15 */
+	if (PQserverVersion(conn) >= 150000)
+		return BACKUP_STATE_NO_BACKUP;
+
+	res = PQexec(conn, sqlquery);
 
 	if (PQresultStatus(res) != PGRES_TUPLES_OK)
 	{