#!/usr/bin/python
#
# kabitool - Red Hat kABI extraction tool (version 2)
#
# We use this script to generate RPM dependencies based on symversions.
#
# Author: Jon Masters <jcm@redhat.com>
# Copyright (C) 2009 Red Hat, Inc.
#
# This software may be freely redistributed under the terms of the GNU
# General Public License (GPL).

# Changelog:
# 
# 2009/08/01 - New version based on kABI dep plan for RHEL6.
#

__author__ = "Jon Masters <jcm@redhat.com>"
__version__ = "$Revisions: 2.0 $"
__date__ = "$Date$"
__copyright__ = "Copyright (C) 2009 Red Hat, Inc"
__license__ = "GPL"

import getopt
import os
import re
import sha
import string
import sys

true = 1
false = 0

def load_symbols(filename):
	"""Load the kernel exported symbols from Module.symvers."""

	ksyms = open(filename,"r")

	symbols={}

	while true:
		line = ksyms.readline()
		if line == "":
			break;
		if line == "\n":
			continue
		checksum,symbol,path,license = string.split(line)

		symbols[symbol] = dict(checksum=checksum,
				       path=path,
				       license=license)

	return symbols

def output_deps(depsfile,symbols):

	deps_file = open(depsfile,"w")

	for symbol in sorted(symbols.keys()):
		deps_file.write("kernel("+symbol+") = " +
				symbols[symbol]['checksum'] + "\n")

def usage():
	print """
kabitool: process Module.symvers into useful exported kABI dependencies

	kabitool [-k kernel] [-s symbols ]

	-o		The file to output sorted dependencies to

	-s		The Module.symvers file to import from

"""

if __name__ == "__main__":

	symdeps_file = ""
	symvers_file = ""

	opts, args = getopt.getopt(sys.argv[1:], 'ho:s:')

	for o, v in opts:
		if o == "-h":
			usage()
			sys.exit(0)
		if o == "-o":
			symdeps_file = v
		if o == "-s":
			symvers_file = v
	
	if (symdeps_file == ""):
		symdeps_file = "Module.symdeps"

	if (symvers_file == ""):
		symvers_file = "Module.symvers"

	if not (os.path.isfile(symvers_file)):
		print "cannot read Module.symvers file"
		usage()
		exit(1)

	symbols = load_symbols(symvers_file)
	output_deps(symdeps_file, symbols)