ctdb-scripts: Drop unnecessary complexity from wrapper

All of this logic was necessary when ctdbd did poor PID file and
socket handling.  Those things are now solid, so remove this
unnecessary logic.

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

diff --git a/ctdb/config/ctdbd_wrapper b/ctdb/config/ctdbd_wrapper
index a507f489bccaa9b7ffea7d771dc53ceb63c8789a..1f79e606a44da0b99bae051d825de39a5d535237 100755 (executable)
--- a/ctdb/config/ctdbd_wrapper
+++ b/ctdb/config/ctdbd_wrapper
@@ -28,32 +28,6 @@ ctdbd="${CTDBD:-/usr/local/sbin/ctdbd}"
 
 ############################################################
 
-# ctdbd_is_running()
-
-# Check if ctdbd is running.  ctdbd is only considered to running if
-# the PID in the PID file is active and is called "ctdbd".  Return
-# true if this is the case.  Print the PID regardless, since it can be
-# used to kill stale processes in the session.
-
-ctdbd_is_running ()
-{
-       if read _pid 2>/dev/null <"$pidfile" ; then
-               echo "$_pid"
-
-               # This could be optimised with ps options -q and -h.
-               # However, -q is not generally available because it is
-               # fairly new and -h is not in some older distros.  The
-               # options below are portable.
-               _cmd=$(ps -p "$_pid" -o comm | tail -n +2)
-               [ "$_cmd" = "ctdbd" ]
-       else
-               # Missing/empty PID file
-               return 1
-       fi
-}
-
-############################################################
-
 # If necessary, mount volatile database directory on tmpfs
 dbdir_tmpfs_start ()
 {
@@ -151,28 +125,10 @@ export_debug_variables ()
     [ -n "$CTDB_DEBUG_LOCKS" ] && export CTDB_DEBUG_LOCKS
 }
 
-kill_ctdbd ()
-{
-    _session="$1"
-
-    if [ -n "$_session" ] ; then
-       pkill -9 -s "$_session" 2>/dev/null
-    fi
-}
-
 ############################################################
 
 start()
 {
-    if _session=$(ctdbd_is_running) ; then
-       echo "CTDB is already running"
-       return 0
-    fi
-
-    # About to start new $ctdbd.  The main daemon is not running but
-    # there may still be other processes around, so do some cleanup.
-    kill_ctdbd "$_session"
-
     dbdir_tmpfs_start
 
     # build_ctdb_options() takes no arguments
@@ -242,44 +198,20 @@ start()
 
 stop()
 {
-    if ! _session=$(ctdbd_is_running) ; then
-       echo "CTDB is not running"
-       return 0
-    fi
-
-    $CTDB shutdown
-
-    # Wait for remaining CTDB processes to exit...
-    _timeout=${CTDB_SHUTDOWN_TIMEOUT:-30}
-    _count=0
-    _terminated=false
-    while [ "$_count" -lt "$_timeout" ] ; do
-       if ! pkill -0 -s "$_session" 2>/dev/null ; then
-           _terminated=true
-           break
-       fi
-
-       _count=$((_count + 1))
-       sleep 1
-    done
-
-    if ! $_terminated ; then
-       echo "Timed out waiting for CTDB to shutdown.  Killing CTDB processes."
-       kill_ctdbd "$_session"
-       drop_all_public_ips >/dev/null 2>&1
-
-       sleep 1
-
-       if pkill -0 -s "$_session" ; then
-           # If SIGKILL didn't work then things are bad...
-           echo "Failed to kill all CTDB processes.  Giving up."
-           return 1
+       $CTDB shutdown
+
+       # The above command is important and needs to stand out, so
+       # post-check exit status
+       # shellcheck disable=SC2181
+       if [ $? -ne 0 ] ; then
+               echo "Error while shutting down CTDB"
+               drop_all_public_ips >/dev/null 2>&1
+               return 1
        fi
-    fi
 
-    dbdir_tmpfs_stop
+       dbdir_tmpfs_stop
 
-    return 0
+       return 0
 }
 
 ############################################################