#!/bin/sh
# Olivier S. Masse  2006/02/28
#
# This script update root's crontab with a template that you can distribute
# in a package.
#
# How it works:
#
# 1. Create a file named /var/spool/cron/crontabs/root.gold
# 2. Put in it every entry you would like to replicate on all your systems
# 3. The crontab will be updated each time you run this script
#
# Copyright (c) 2007, Olivier S. Masse
#
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice, this
#   list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice,
#   this list of conditions and the following disclaimer in the documentation
#   and/or other materials provided with the distribution.
# * Neither the name of Olivier S. Masse nor the names of its contributors
#   may be used to endorse or promote products derived from this software
#   without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#

tempfile="/tmp/$$"

cat /var/spool/cron/crontabs/root | awk '{

	print;
	while ((getline) && (!(match($0, "#__begin_common_crontab"))))
	{
		print;
	}
	exit;

}' >$tempfile

echo "#__begin_common_crontab" >>$tempfile
echo "# warning: do not erase the previous line" >>$tempfile

cat /var/spool/cron/crontabs/root.gold >>$tempfile

echo "# warning: do not erase the following line" >>$tempfile
echo "#__end_common_crontab" >>$tempfile

cat /var/spool/cron/crontabs/root | awk '{

	while (!(match($0, "#__end_common_crontab")) && (getline))
	{
		;
	}
	while (getline)
	{
		print;
	}	
}' >>$tempfile

cat $tempfile
mv $tempfile /var/spool/cron/crontabs/root

# using /sbin/init.d/cron stop hangs this script due to a stupid
# ps -ef in it. So I must kill it myself.
kill $(ps -ef | awk '/\/usr\/sbin\/cron/ {print $2}')
/sbin/init.d/cron start