#!/usr/bin/python
#
# Copyright 2007, Canonical, Daniel Holbach
#
# GPL 3

import os
import sys
import glob

USAGE = \
"""compare-packages <source-package> [<directory>]

   compares contents of binary packages of <source-package> in the current
   directory with those in <directory>"""

def check_args():
    directory = "/var/cache/pbuilder/result"
    sourcepackage = ""

    if len(sys.argv) < 2:
        print USAGE
        sys.exit(1)

    if sys.argv[1] in [ '-h', '--help' ]:
	print USAGE
	sys.exit(0)
    
    if len(sys.argv) > 1:
        sourcepackage = sys.argv[1]
    if len(sys.argv) > 2:
        directory = sys.argv[2]

    return (sourcepackage, directory)


def main():
    (sourcepackage, directory) = check_args()

    (dummy, output, dummy) = os.popen3("apt-cache showsrc %s | grep ^Binary" % \
                (sourcepackage))
    binarypackages = output.read().split(":")[1].strip().split(", ")

    if not os.path.exists("/usr/bin/debdiff"):
        print >> sys.stderr, \
                "'/usr/bin/debdiff' not found, please install 'devscripts'."
        sys.exit(1)

    if not os.path.isdir(directory):
        print >> sys.stderr, "Directory %s not found." % directory
        sys.exit(1)

    for package in binarypackages:
        old = glob.glob("./%s*.deb" % package)
        new = glob.glob("%s/%s*.deb" % (directory, package))
    
        if not new or not old:
            print "Skipping %s, no matching new and old package found." % package
        else:
            print "Comparing %s and %s" % (old[0], new[0])
            sys.stdout.flush()
            os.system("debdiff %s %s" % (old[0], new[0]))
            print ''
            print '---'

if __name__ == '__main__':
    main()