Homework_2_Runlevel

Runlevel

import re,tarfile

runlevel = re.compile("env DEFAULT_RUNLEVEL=\d*$")
initdefault = re.compile(".*:initdefault:.*$")

# Open archive 
tar_archive = tarfile.open("etc.tar.gz", "r:gz")

# Extract necessary file
file = tar_archive.extractfile("etc/init/rc-sysinit.conf")

# Try to open file inittab
try:
	init_file = tar_archive.extractfile('etc/inittab')
	init = True
except Exception:
	init = False

# Variable to safe runlevel
level = 0

if (init):

	# If file inittab exists
	for line in init_file:
		if initdefault.search(line) != None:
			level = line[3]
else:

	# Search in file rc-sysinit.conf
	for line in file:
		if runlevel.search(line) != None:
			level = line[len(line)-2]

# Print result
print str(level)