diff --git a/script/service-runnable b/script/service-runnable
index be65640..ed90c5e 100755
--- a/script/service-runnable
+++ b/script/service-runnable
@@ -1,46 +1,62 @@
 #!/bin/bash
 # This script is part of Booth.
 # It checks whether the given resource (service) still has a chance
 # to run on the local cluster, so that booth knows whether to
 # acquire the ticket here.
 
 service="${1:?Need a resource name as first argument.}"
+if [ -z "$service" ]; then
+	ha_logger "$0: bad usage: no resource name"
+	exit 1
+fi
 tmpshadow=`mktemp booth-check.XXXXXX`
+if [ $? -ne 0 -o ! -f "$tmpshadow" ]; then
+	ha_logger "$0: mktemp failed"
+	exit 1
+fi
+
 trap "rm -f $tmpshadow" EXIT
 
 
 # We expect an output like
 #   p_dummy        (ocf::pacemaker:Dummy): Started geo-rz2-a 
 
-if crm_simulate -O $tmpshadow --ticket-grant "$BOOTH_TICKET" --simulate --live-check |
+status=`crm_simulate -O $tmpshadow --ticket-grant "$BOOTH_TICKET" --simulate --live-check 2>&1`
+if [ $? -ne 0 ]; then
+	ha_logger "$0: crm_simulate failed"
+	ha_logger "$0: crm_simulate: $status"
+	exit 1
+fi
+
+if echo "$status" |
 	sed -n '/^Revised cluster status:/,$p' |
 	egrep "^[[:space:]]+$service[[:space:]]+\(.*\):[[:space:]]+Started ([^[:space:]]+) *$" >/dev/null
 then
 	# can be started - we're done.
 	exit 0
 fi
 
 # If target-role is Stopped, it judges with being stopped explicitly.
 output=$(crm_resource --meta --get-parameter="target-role" --resource=$service 2>/dev/null)
 rc=$?
 if [ $rc -eq 0 -a "$output" = "Stopped" ]; then
 	exit 0
 fi
 
 # is ticket in standby?
 output=$(crm_ticket --ticket "$BOOTH_TICKET" --get-attr standby)
 rc=$?
 if [ $rc -eq 0 -a "$output" = true ]; then
 	exit 0
 fi
 
 # Some error occured.
 # Try to help the admin with a bit of diagnostic.
 #
 # disallow ms-resources, ie. only primitives wanted here
 if ! crm_resource -l | grep -v ":" | grep "$service" ; then
 	ha_logger "Defined resource '$service' in $BOOTH_CONF_PATH is not a primitive??"
 fi
 
 exit 1