#!/bin/bash

# cron-harness
# by Jon Jensen <jon@endpoint.com>
# $Id: cron-harness,v 1.3 2005/12/31 15:28:25 jon Exp $
#
# Invocation:
# cron-harness [ -e email@address ] some-program and its args
#
# Run some program. If it returns an error exit value, either email its
# output somewhere (if the -e option is given) or simply send it to stdout
# (the default); otherwise be silent.

email=
while getopts e: opts
do
	if [ "$opts" = e ]; then
		email=$OPTARG
	elif [ "$opts" = '?' ]; then
		echo "cron-harness: Error parsing options" >&2
		exit 1
	fi
done
shift $(($OPTIND - 1))

if [ -z "$*" ]; then
	echo "cron-harness: No command given" >&2
	exit 1
fi

outfile=`mktemp -t cron-harness.out.XXXXXXXXXX`
if [ $? -ne 0 ]; then
	echo "cron-harness: Error creating temporary file" >&2
	exit 1
fi

exit=0

$* > $outfile 2>&1

if [ $? -ne 0 ]; then
	if [ -n "$email" ]; then
		hostname=`hostname | sed 's/\..*//'`
		mail -s "cron-harness: Error running $1 on $hostname" $email < $outfile
	else
		cat $outfile
	fi
	exit=2
fi

rm -f $outfile

exit $exit