etc/vps-postcreate

#!/bin/bash
#  Copyright (C) 2000-2006 SWsoft. All rights reserved.
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software
#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
#
# This scripts performe postinstall tasks:
# 1. Randomizes crontab for given VPS so all crontab tasks
#  of all VPSs will not start at the same time.
# 2. Disables root password if it is empty.
#
# Parameters are passed in environment variables.
# Required parameters:
#   VE_ROOT - root directory of this VPS
# Optional parameters:
#   DIST    - name of the distro this VPS runs

function randcrontab()
{
FILE=$VE_ROOT"/etc/crontab"

	if [ ! -f $FILE ]
	then
		vzwarning "No such file $FILE"
		return 1
	fi

	FILE_TMP=`mktemp $FILE.XXXXXX` || return 1;

	cat $FILE | awk '
BEGIN { srand(); }
{
	if ($0 ~ /^[ \t]*#/ || $0 ~ /^[ \t]+*$/) {
		print $0;
        	next;
	}
	if ((n = split($0, ar, /[ \t]/)) < 7) {
		print $0;
		next;
	}
	# min
	if (ar[1] ~ /^[0-9]+$/) {
#		print "->"  $0;
		ar[1] = int(rand() * 59);
	}
	# hour
	if (ar[2] ~ /^[0-9]+$/) {
		ar[2] = int(rand() * 6);
	}
	# day
	if (ar[3] ~ /^[0-9]+$/) {
		ar[3] = int(rand() * 31) + 1;
	}
	line = ar[1];
	for (i = 2; i <= n; i++) {
		line = line " "  ar[i];
	}
	print line;
} 
' > $FILE_TMP && cat $FILE_TMP > $FILE
	rm -f $FILE_TMP
}

function disableroot()
{
FILE=$VE_ROOT"/etc/passwd"

	if [ ! -f $FILE ]
	then
		vzwarning "No such file $FILE"
		return 1
	fi

	if grep "^root::" $FILE >/dev/null 2>&1
	then
		FILE_TMP=`mktemp $FILE.XXXXXX` || return 1;
		sed 's/^root::/root:!!:/g' < $FILE > $FILE_TMP && cat $FILE_TMP > $FILE
		rm -f $FILE_TMP
	fi
}

function setupifup()
{
	FILE=$VE_ROOT"/sbin/ifup"

	if [ ! -f $FILE ]; then 
		return 0
	fi

	if grep 'if \[ "\${DEVICE}" = "lo" \]; then' $FILE >/dev/null 2>&1; then
		cp -fp $FILE $FILE.$$ 
		/bin/sed -e "s/if \[ "\${DEVICE}" = "lo" \]; then/if \[ "${IPADDR}" = "127.0.0.1" \]; then/" < $FILE > $FILE.$$
		if [ $? -eq 0 ]; then
			mv -f ${FILE}.$$ ${FILE}
		fi
		rm -f ${FILE}.$$ 2>/dev/null

	fi
}

[ -z "${VE_ROOT}" ] && exit 20

randcrontab 
disableroot
setupifup

exit 0