ctdb-database: Define database configuration file options

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

ctdb/database/database_conf.c

@@ -0,0 +1,144 @@
+/*
+   CTDB database config handling
+
+   Copyright (C) Martin Schwenke  2018
+
+   database_conf_validate_lock_debug_script() based on
+   event_conf_validatye_debug_script():
+
+     Copyright (C) Amitay Isaacs  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 "system/filesys.h"
+#include "system/dir.h"
+
+#include "lib/util/debug.h"
+#include "lib/util/samba_util.h"
+
+#include "common/conf.h"
+#include "common/path.h"
+
+#include "database_conf.h"
+
+#define DATABASE_CONF_VOLATILE_DB_DIR_DEFAULT   CTDB_VARDIR "/volatile"
+#define DATABASE_CONF_PERSISTENT_DB_DIR_DEFAULT CTDB_VARDIR "/persistent"
+#define DATABASE_CONF_STATE_DB_DIR_DEFAULT      CTDB_VARDIR "/state"
+
+static bool check_static_string_change(const char *key,
+				       const char *old_value,
+				       const char *new_value,
+				       enum conf_update_mode mode)
+{
+	if (mode == CONF_MODE_RELOAD) {
+		if (strcmp(old_value, new_value) != 0) {
+			D_WARNING("Ignoring update of [%s] -> %s\n",
+				  DATABASE_CONF_SECTION,
+				  key);
+		}
+	}
+
+	return true;
+}
+
+static bool database_conf_validate_lock_debug_script(const char *key,
+						     const char *old_script,
+						     const char *new_script,
+						     enum conf_update_mode mode)
+{
+	char script[PATH_MAX];
+	char script_path[PATH_MAX];
+	struct stat st;
+	size_t len;
+	int ret;
+
+	if (new_script == NULL) {
+		return true;
+	}
+
+	len = strlcpy(script, new_script, sizeof(script));
+	if (len >= sizeof(script)) {
+		D_ERR("lock debug script name too long\n");
+		return false;
+	}
+
+	ret = snprintf(script_path,
+		       sizeof(script_path),
+		       "%s/%s",
+		       path_etcdir(),
+		       basename(script));
+	if (ret >= sizeof(script_path)) {
+		D_ERR("lock debug script path too long\n");
+		return false;
+	}
+
+	ret = stat(script_path, &st);
+	if (ret == -1) {
+		D_ERR("lock debug script %s does not exist\n", script_path);
+		return false;
+	}
+
+	if (! S_ISREG(st.st_mode)) {
+		D_ERR("lock debug script %s is not a file\n", script_path);
+		return false;
+	}
+	if (! (st.st_mode & S_IXUSR)) {
+		D_ERR("lock debug script %s is not executable\n", script_path);
+		return false;
+	}
+
+	return true;
+}
+
+static bool database_conf_validate_db_dir(const char *key,
+					  const char *old_dir,
+					  const char *new_dir,
+					  enum conf_update_mode mode)
+{
+	if (! directory_exist(new_dir)) {
+		D_ERR("%s \"%s\" does not exist\n", key, new_dir);
+		return false;
+	}
+
+	/* This sometimes warns but always returns true */
+	return check_static_string_change(key, old_dir, new_dir, mode);
+}
+
+void database_conf_init(struct conf_context *conf)
+{
+	conf_define_section(conf, DATABASE_CONF_SECTION, NULL);
+
+	conf_define_string(conf,
+			   DATABASE_CONF_SECTION,
+			   DATABASE_CONF_VOLATILE_DB_DIR,
+			   DATABASE_CONF_VOLATILE_DB_DIR_DEFAULT,
+			   database_conf_validate_db_dir);
+	conf_define_string(conf,
+			   DATABASE_CONF_SECTION,
+			   DATABASE_CONF_PERSISTENT_DB_DIR,
+			   DATABASE_CONF_PERSISTENT_DB_DIR_DEFAULT,
+			   database_conf_validate_db_dir);
+	conf_define_string(conf,
+			   DATABASE_CONF_SECTION,
+			   DATABASE_CONF_STATE_DB_DIR,
+			   DATABASE_CONF_STATE_DB_DIR_DEFAULT,
+			   database_conf_validate_db_dir);
+	conf_define_string(conf,
+			   DATABASE_CONF_SECTION,
+			   DATABASE_CONF_LOCK_DEBUG_SCRIPT,
+			   NULL,
+			   database_conf_validate_lock_debug_script);
+}

ctdb/database/database_conf.h

@@ -0,0 +1,34 @@
+/*
+   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/>.
+*/
+
+#ifndef __CTDB_DATABASE_CONF_H__
+#define __CTDB_DATABASE_CONF_H__
+
+#include "common/conf.h"
+
+#define DATABASE_CONF_SECTION "database"
+
+#define DATABASE_CONF_VOLATILE_DB_DIR           "volatile database directory"
+#define DATABASE_CONF_PERSISTENT_DB_DIR         "persistent database directory"
+#define DATABASE_CONF_STATE_DB_DIR              "state database directory"
+#define DATABASE_CONF_LOCK_DEBUG_SCRIPT          "lock debug script"
+
+void database_conf_init(struct conf_context *conf);
+
+#endif /* __CTDB_DATABASE_CONF_H__ */

ctdb/wscript

@@ -468,6 +468,10 @@ def build(bld):
                         source='cluster/cluster_conf.c',
                         deps='ctdb-util')
 
+    bld.SAMBA_SUBSYSTEM('ctdb-database-conf',
+                        source='database/database_conf.c',
+                        deps='ctdb-util')
+
     bld.SAMBA_SUBSYSTEM('ctdb-event-conf',
                         source='event/event_conf.c',
                         deps='ctdb-util')