pg_basebackup-write-dbname.v0001.patch

diff --git a/src/fe_utils/recovery_gen.c b/src/fe_utils/recovery_gen.c
index 2585f11939..de463f3956 100644
--- a/src/fe_utils/recovery_gen.c
+++ b/src/fe_utils/recovery_gen.c
@@ -49,12 +49,16 @@ GenerateRecoveryConfig(PGconn *pgconn, char *replication_slot)
 	{
 		/* Omit empty settings and those libpqwalreceiver overrides. */
 		if (strcmp(opt->keyword, "replication") == 0 ||
-			strcmp(opt->keyword, "dbname") == 0 ||
 			strcmp(opt->keyword, "fallback_application_name") == 0 ||
 			(opt->val == NULL) ||
 			(opt->val != NULL && opt->val[0] == '\0'))
 			continue;
 
+		/* Omit "dbname" in PostgreSQL 16 and earlier. */
+		if (strcmp(opt->keyword, "dbname") == 0 &&
+			PQserverVersion(pgconn) < MINIMUM_VERSION_FOR_DBNAME_PARAM)
+			continue;
+
 		/* Separate key-value pairs with spaces */
 		if (conninfo_buf.len != 0)
 			appendPQExpBufferChar(&conninfo_buf, ' ');
diff --git a/src/include/fe_utils/recovery_gen.h b/src/include/fe_utils/recovery_gen.h
index ca2c4800d0..740d90c9d8 100644
--- a/src/include/fe_utils/recovery_gen.h
+++ b/src/include/fe_utils/recovery_gen.h
@@ -20,6 +20,12 @@
  */
 #define MINIMUM_VERSION_FOR_RECOVERY_GUC 120000
 
+/*
+ * from version 17, there is a use-case for adding the dbname parameter
+ * to the generated "primary_conninfo" value
+ */
+#define MINIMUM_VERSION_FOR_DBNAME_PARAM 170000
+
 extern PQExpBuffer GenerateRecoveryConfig(PGconn *pgconn,
 										  char *replication_slot);
 extern void WriteRecoveryConfig(PGconn *pgconn, char *target_dir,