From: Martin Schwenke <martin@meltin.net>
Date: Fri, 20 Apr 2018 02:12:44 +0000 (+1000)
Subject: ctdb-scripts: Add function ctdb_get_db_options()
X-Git-Url: http://git.samba.org/?p=metze%2Fsamba%2Fwip.git;a=commitdiff_plain;h=16aa9e7a303e13440d702ae444842af349db961c

ctdb-scripts: Add function ctdb_get_db_options()

This pulls database options from the configuration file, caches then
and makes the values available in scripts.

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

diff --git a/ctdb/config/functions b/ctdb/config/functions
index f3d7c163ec4f..649b367d4cb9 100755
--- a/ctdb/config/functions
+++ b/ctdb/config/functions
@@ -244,6 +244,43 @@ ctdb_get_ip_address ()
     cat "$_ip_addr_file"
 }
 
+# Cached retrieval of database options for use by event scripts.
+#
+# If the variables are already set then they should not be overwritten
+# - this should only happen during event script testing.
+ctdb_get_db_options ()
+{
+	_db_opts_file="${CTDB_SCRIPT_VARDIR}/db_options.cache"
+
+	if [ ! -f "$_db_opts_file" ] ; then
+		{
+			ctdb_translate_option "database" \
+					      "volatile database directory" \
+					      "CTDB_DBDIR"
+			ctdb_translate_option "database" \
+					      "persistent database directory" \
+					      "CTDB_DBDIR_PERSISTENT"
+			ctdb_translate_option "database" \
+					      "state database directory" \
+					      "CTDB_DBDIR_STATE"
+		} >"$_db_opts_file"
+	fi
+
+	. "$_db_opts_file"
+}
+
+ctdb_translate_option ()
+{
+	_section="$1"
+	_opt="$2"
+	_variable="$3"
+
+	# ctdb-config already prints an error if something goes wrong
+	_t=$("${CTDB_HELPER_BINDIR}/ctdb-config" get "$_section" "$_opt") || \
+		exit $?
+	echo "${_variable}=\"${_t}\""
+}
+
 ######################################################
 # wrapper around /proc/ settings to allow them to be hooked
 # for testing