#!/usr/bin/python

import urllib2
import re
import os
from datetime import date

download = True
scriptdir = os.getcwd()
nsisdir = "C:\Program Files\NSIS"
tempdir = os.tempnam()

os.mkdir(tempdir)

def getHomePath():
        if os.name == "posix":
                return os.getenv("HOME")
        elif os.name == "nt":
                import win32com.client
                objShell = win32com.client.Dispatch("WScript.Shell")
                return objShell.SpecialFolders("MyDocuments")

try:
        os.mkdir(getHomePath() + "/av_updates")
except os.error:
        print "**** Folder exists, continuing... ****"

os.chdir(getHomePath() + "/av_updates")

if download:
	try:
		page = urllib2.urlopen("http://free.avg.com/gb-en/download-update").read()
	except urllib2.HTTPError, e:
		print '**** The server couldn\'t fulfill the request.', e.code, '****'
	except urllib2.URLError, e:
		print '**** We failed to reach a server. ', e.reason, '****'
	else:
		url1 = re.search(r"(http://download.avgfree.com/softw/90free/update/[^\"]+)\"\s+class=\"clr\"\s*>Windows[^<]+<\/a></td><td[^>]+>All\snecessary\smodules", page).group(1)
		url2 = re.search(r"(http://download\.avgfree\.com/softw/90free/update/[^\"]+)\"\s+class=\"clr\"\s*>IAVI", page).group(1)
	
		if url1 is not None:
			print os.system("wget -S -N " + url1)
		else:
			print '**** Failed to retrieve modules url. ****'
	
		if url2 is not None:
			print os.system("wget -S -N " + url2)
		else:
			print '**** Failed to retrieve database url. ****'

	print os.system("wget -S -N http://www.superantispyware.com/downloads/SASDEFINITIONS.EXE")
	print os.system("wget -S -N http://www.malwarebytes.org/mbam/database/mbam-rules.exe")
	print os.system("wget -S -N http://www.spybotupdates.biz/updates/files/spybotsd_includes.exe")

# Prepare our update script.
with open(os.path.join(scriptdir, 'av_updates.nsi'), 'r') as f:
	template = f.read()

today = date.today()

template = template.replace('{{date}}', today.isoformat())
template = template.replace('{{scriptdir}}', scriptdir)
template = template.replace('{{avg_update_1}}', re.search(r"/((\w|[-.])+)$", url1).group(1))
template = template.replace('{{avg_update_2}}', re.search(r"/((\w|[-.])+)$", url2).group(1))

# Build our script!
buildfile = os.path.join(tempdir, today.isoformat() + '.nsi')

with open(buildfile, 'w') as f:
	f.write(template)

os.chdir(nsisdir)

cmd = 'makensis "' + buildfile + '"'
print '**** ' + cmd + ' ****'
os.system(cmd)

This is a rather nasty first attempt, while it works under Windows XP there is no real error checking.

AV Updates script

Python