Eventscripts - new function ctdb_set_current_debuglevel()

This function ensures that CTDB_CURRENT_DEBUGLEVEL is set.  It works
like this:

1. If it is already set then do nothing, since it might have been set
   some other way.

   The recommended "other way" would be to add a file in rc.local.d/.

2. If it is not set then set it by sourcing
   /var/ctdb/eventscript_debuglevel.

3. If this file does not exist then create it using output from "ctdb
   getdebug".

If the optional 1st argument is set to "create" then don't source an
existing file but create a new one instead - this is useful for
creating the file just once in each event run in, say, 00.ctdb.

If there's a problem getting the debug level from ctdb then it is
silently set to 0 - no use spamming logs if our debug code is
broken...

Signed-off-by: Martin Schwenke <martin@meltin.net>

diff --git a/config/functions b/config/functions
index b04965281dbfcfe987dab89fab67a3ce5654f523..26b282aa994b7e595fe9cc9b8013b71297e7a843 100755 (executable)
--- a/config/functions
+++ b/config/functions
@@ -37,6 +37,37 @@ loadconfig () {
     _loadconfig "$@"
 }
 
+##############################################################
+# make sure CTDB_CURRENT_DEBUGLEVEL is set to the desired debug level
+# (integer)
+#
+# If it is already set then do nothing, since it might have been set
+# via a file in rc.local.d/.  If it is not set then set it by sourcing
+# /var/ctdb/eventscript_debuglevel. If this file does not exist then
+# create it using output from "ctdb getdebug".  If the option 1st arg
+# is "create" then don't source an existing file but create a new one
+# instead - this is useful for creating the file just once in each
+# event run in 00.ctdb.  If there's a problem getting the debug level
+# from ctdb then it is silently set to 0 - no use spamming logs if our
+# debug code is broken...
+ctdb_set_current_debuglevel ()
+{
+    [ -z "$CTDB_CURRENT_DEBUGLEVEL" ] || return 0
+
+    _f="$CTDB_VARDIR/eventscript_debuglevel"
+
+    if [ "$1" = "create" -o ! -r "$_f" ] ; then
+       _t=$(ctdb getdebug -Y 2>/dev/null)
+       # get last field of output
+       _t="${_t%:}"
+       _t="${_t##*:}"
+       # Defaults to 0
+       echo "export CTDB_CURRENT_DEBUGLEVEL=\"${_t:-0}\"" >"$_f"
+    fi
+
+    . "$_f"
+}
+
 ##############################################################
 # determine on what type of system (init style) we are running
 detect_init_style() {