import re
import os
import popen2
import sys
import string

# Function to parse out the...
#
#  append="mem=768M"
#
# ...line from lilo.conf to give us
#  (in this case) the '768'
####

def getACTMemoryStartFromLilo():

   # open 'lilo.conf'
   liloFile = open("/etc/lilo.conf", 'r')

   # Pattern for matching comments so we can ignore them
   commentMatcher = re.compile('#.*')

   # Pattern for figuring out the start of a stanza
   imageMatcher = re.compile('.*image[\s]*=.*')

   # Pattern for finding the 'label=linux' line in the stanza
   #  This makes sure we found the correct stanza.
   labelMatcher = re.compile('.*label[\s]*=[\s]*linux.*')

   # Pattern for matching and extracting the...
   #  append="mem=768M"
   # ...line
   memMatcher = re.compile('.*append[\s]*=[\s]*\"[\s]*mem[\s]*\=[\s]*([0-9]+)[\s]*M')

   done = 0
   labelFound = 0   # flag
   memoryFound = 0  # flag

   detectedMemoryOffset = 0

   while done == 0:
      thisLine = liloFile.readline()
      if not thisLine:
         done = 1

      thisLine = commentMatcher.sub('', thisLine)
      thisLine = string.strip(thisLine)

      if thisLine != "":

         matchResult = imageMatcher.match(thisLine)

   # at the start of a new stanza reset our flags
         if matchResult:
            labelFound = 0
            memoryFound = 0
            detectedMemoryOffset = 0

         matchResult = labelMatcher.match(thisLine)
         if matchResult:
            labelFound = 1
            if memoryFound:
               done = 1

         matchResult = memMatcher.match(thisLine)
         if matchResult:
            detectedMemoryOffset = int(matchResult.group(1))
            memoryFound = 1
            if labelFound:
               done = 1

   return detectedMemoryOffset

-- MattWalsh - 11 Dec 2001