Import the watchdog script

A script to be run periodically and check for health of daemons.

watchdog/watchdog.sh

+#!/bin/sh
+
+set -ex
+
+# Configuration
+SERVICES="ucollect"
+TEMPFILE=/tmp/watchdog.tmp.$$
+
+# Grap current list of processes, strip off the header and keep only the first and last column.
+# Seems like our ps doesn't know how to specify format, so we have to get through the
+# human-friendly crap
+ps | tail -n+2 | sed -e 's/^ *\([0-9][0-9]*\)\(  *[^ ]*\)\{3\} */\1 /'>"$TEMPFILE"
+
+for SERVICE in $SERVICES ; do
+	# Get the claimed PID of the service
+	PID=`cat /var/run/"$SERVICE".pid || echo 'No such PID available'`
+	FILE=/tmp/watchdog-"$SERVICE"-missing
+	# Look if there's a process with such name and PID in as reliable way as shell allows
+	if grep "^$PID " "$TEMPFILE" | sed -e 's/^[^ ]*//' | grep "$SERVICE">/dev/null ; then
+		# It runs. Remove any possible missing note from previous run.
+		rm -f "$FILE"
+	else
+		if test -f "$FILE" ; then
+			# It is not there and was not there the previous time. Restart.
+			/etc/init.d/"$SERVICE" restart
+			echo "Restarted $SERVICE" | logger -t watchdog -p daemon.warn
+			rm -f "$FILE"
+		else
+			# It was here previously, but it is not here now. Note it is
+			# missing (it may be temporary state, in the middle of upgrade,
+			# for example.
+			touch "$FILE"
+		fi
+	fi
+done
+
+rm "$TEMPFILE"