Script para baixar os updates do AVG

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#!/bin/sh
###############################################################################
#
# Copyright (C) 2002,2003 Grando, Marcus
#
# 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.
#
###############################################################################
#
# avg_update.sh - Script para baixar o Update do AVG
#
# Marcus Grando 
# <marcus at sbh dot eng dot br>
#
# Versao 0.9.2 - 06/10/2003
#
# TODO: setar automaticamente as variaveis?
#
# CHANGELOG:
#
# 0.9.3: Erro ao fazer o download do arquivo que esta com o tamanho errado,
#        estava baixando um arquivo *.1, foi alterada a opcao no wget para
#        que funcione corretamente (-N).
# 0.9.2: Recriar o arquivo svg6info.ctl, pois o que ele baixa do servidor
#        nao funciona, pois tem o "../xx/", ao final eh recriado o arquivo.
#

##
## sair()
##
erro_var=""
sair() {
  echo "ERRO: Ocorreu algum erro na definicao da variavel '$erro_var'";
  exit 1;
}

##
## Variaveis
##
home=/home/avgupdate; [ ! -d $home ]&& erro_var="home" sair
url=http://www.grisoft.com/softw/60/fe
arqinfo=avg6info.ctf
log=avg_update.log
email=marcus@sbh.eng.br

##
## Programas
##
rm=/bin/rm; [ ! -x $rm ]&& erro_var="rm" sair
touch=/bin/touch; [ ! -x $touch ]&& erro_var="touch" sair
wget=/usr/bin/wget; [ ! -x $wget ]&& erro_var="wget" sair
mail=/bin/mail; [ ! -x $mail ]&& erro_var="mail" sair
grep=/bin/grep; [ ! -x $grep ]&& erro_var="grep" sair
cut=/usr/bin/cut; [ ! -x $cut ]&& erro_var="cut" sair
echo=/bin/echo; [ ! -x $echo ]&& erro_var="echo" sair
find=/usr/bin/find; [ ! -x $find ]&& erro_var="find" sair
xargs=/usr/bin/xargs; [ ! -x $xargs ]&& erro_var="xargs" sair
cat=/bin/cat; [ ! -x $cat ]&& erro_var="cat" sair
ps=/bin/ps; [ ! -x $ps ]&& erro_var="ps" sair
awk=/usr/bin/awk; [ ! -x $awk ]&& erro_var="awk" sair
ls=/bin/ls; [ ! -x $ls ]&& erro_var="ls" sair

##
## Vai para o $home
##
cd $home

##
## Previne para que nao ocorra outro update
##
if [ -f "prevent_update" ]; then
  psavg=`$ps -aux | $grep wget | $grep avg`
  if [ "$psavg" != "" ]; then
    $echo "Existe outro arquivo \"prevent_update\"" | $mail -s "[AVG-Update] Erro" $email
    exit 3
  fi
else
  $touch prevent_update
fi

##
## Remove arquivos $arqinfo/$log
##
[ -f $arqinfo ] && $rm -rf $arqinfo
[ -f $log ] && $rm -rf $log

##
## Download do $arqinfo
##
$wget -o $log $url/$arqinfo

##
## Testa se existe o $arqinfo
##
if [ -f "$arqinfo" ]; then
  bin_update=`$cat $arqinfo | $awk 'gsub(/("|.*\/.*\/)/,"") {print $1}'`
else
  $cat $log | $mail -s AVG-Update $email
  exit 3
fi

##
## Procura pelos .bin antigos e remove eles
##
old_bin=`$find . -name "*.bin" | $awk 'gsub(/.\//,"") {print}'`
if [ "$old_bin" != "" ]; then
  for i in $old_bin; do
    remove_old=true
    for n in $bin_update; do
      if [ "$i" = "$n" ]; then
        remove_old=false
      fi
    done
    if $remove_old; then
      $rm -rf $i
    fi
  done
fi

##
## Download dos novos .bin
##
envia_email=false
for i in $bin_update; do
  arq_down=`$cat $arqinfo | $grep $i | $awk 'gsub(/"/,"") {print $1}'`
  if [ -f $i ]; then
    size_arqinfo=`$cat $arqinfo | $grep $i | $awk '{print $2}' | $cut -d= -f2`
    size_ls=`$ls -lk $i | $awk '{print $5}'`
    if [ "$size_arqinfo" != "$size_ls" ]; then
      $wget -N -a $log $url/$arq_down
      envia_email=true
    fi
  else
    $wget -N -a $log $url/$arq_down
    envia_email=true
  fi
done

##
## Gera arquivo avg6info.ctf
if [ -f $arqinfo ]; then
  $cat $arqinfo | $awk '{gsub(/..\/.*\//,"")} {print}' > $arqinfo
fi 
    
##
## Envia email
##
if $envia_email; then
  $cat $log | $mail -s "[AVG-Update] Atualizado" $email
fi

##
## Remove arquivo $prevent_update
##
$rm -rf prevent_update

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