ctdb-failover: Add failover configuration options

Only a "disabled" option for now.  Not documented because it isn't
used yet.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=13589

Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>

ctdb/failover/failover_conf.c

@@ -0,0 +1,53 @@
+/*
+   CTDB database config handling
+
+   Copyright (C) Martin Schwenke  2018
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "replace.h"
+
+#include "lib/util/debug.h"
+
+#include "common/conf.h"
+
+#include "failover/failover_conf.h"
+
+static bool check_static_boolean_change(const char *key,
+					bool old_value,
+					bool new_value,
+					enum conf_update_mode mode)
+{
+	if (mode == CONF_MODE_RELOAD || CONF_MODE_API) {
+		if (old_value != new_value) {
+			D_WARNING("Ignoring update of [%s] -> %s\n",
+				  FAILOVER_CONF_SECTION,
+				  key);
+		}
+	}
+
+	return true;
+}
+
+void failover_conf_init(struct conf_context *conf)
+{
+	conf_define_section(conf, FAILOVER_CONF_SECTION, NULL);
+
+	conf_define_boolean(conf,
+			    FAILOVER_CONF_SECTION,
+			    FAILOVER_CONF_DISABLED,
+			    false,
+			    check_static_boolean_change);
+}

ctdb/failover/failover_conf.h

@@ -0,0 +1,31 @@
+/*
+   CTDB failover config handling
+
+   Copyright (C) Martin Schwenke  2018
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __CTDB_FAILOVER_CONF_H__
+#define __CTDB_FAILOVER_CONF_H__
+
+#include "common/conf.h"
+
+#define FAILOVER_CONF_SECTION "failover"
+
+#define FAILOVER_CONF_DISABLED "disabled"
+
+void failover_conf_init(struct conf_context *conf);
+
+#endif /* __CTDB_FAILOVER_CONF_H__ */

ctdb/wscript

@@ -496,6 +496,10 @@ def build(bld):
                         source='event/event_conf.c',
                         deps='ctdb-util')
 
+    bld.SAMBA_SUBSYSTEM('ctdb-failover-conf',
+                        source='failover/failover_conf.c',
+                        deps='ctdb-util')
+
     bld.SAMBA_SUBSYSTEM('ctdb-legacy-conf',
                         source='server/legacy_conf.c',
                         deps='ctdb-util')