For systemd, added some extra tests

This is to make sure that it's only launched after MySQL & ROBUST have
started.

systemd.scripts/is-service-up.sh

@@ -0,0 +1,58 @@
+#!/bin/bash
+
+# Usage: 
+# `is-service-up.sh [service name] [sleeping time in seconds] [grep search string to check]
+# where only $1 is mandatory, the rest optional
+# e. g. `is-service-up.sh some.service 60 ' active'`
+# Note that this script cannot return any output, which will be ignored by
+# systemctl.
+# (gwyneth 20211118)
+
+# Extract parameters, if they exist
+# At least, we need the service name; abort otherwise with error 22 (invalid
+# argument) (gwyneth 20211118)
+if [ $# -eq 0 ]; then exit 22; fi
+
+# echo "Arguments: $1 $2"
+# init variables with command-line arguments
+serviceName="$1"
+sleepTime="$2"
+
+if [ -z $sleepTime ]
+then
+	sleepTime=60
+fi
+
+# echo "Service: $serviceName $sleepTime"
+
+# First, check that the service is active and enabled.
+# is-enabled is not totally quiet (even with --quiet) so we redirect stderr
+# to /dev/null
+function is_service_active {
+#	echo "Inside function call, launching command"
+	/usr/bin/systemctl --quiet is-active $serviceName | /usr/bin/systemctl --quiet is-enabled $serviceName > /dev/null 2>&1
+#	/usr/bin/systemctl status $serviceName | /usr/bin/grep $searchString > /dev/null 2>&1
+	local retvalue=$?
+#	echo "Inside function call, result was: "$retvalue
+	return $retvalue
+}
+
+
+# Debugging... (one day, it will be a command option...)
+#is_service_active
+#echo "Debug run: "$?
+#if [ $? -eq 0 ]
+#then
+#	echo "Active, status was $?"
+#else
+#	echo "Dead, status was $?"
+#fi
+
+# Loop until service becomes active; sleep a bit between checks
+is_service_active
+until [ $? -eq 0 ]
+do
+#	echo "Got $?" 
+	sleep $sleepTime
+	is_service_active
+done