#!/usr/bin/python
#
# pkgdiff -- check slackware package names against installed versions
#
# usage: See usage method, below.
#
# 1.0,14-Sep-2007: initial release
#
# Copyright (c) 2007 Brian "Beej Jorgensen" Hall <beej@beej.us>
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

import sys
import os
import os.path
import glob

PKGPATH='/var/adm/packages'

class AppContext(object):
	def __init__(self, argv):
		self.filenamelist = []
		self.scriptname = os.path.basename(argv[0])
		i = 1
		while i < len(argv):
			if argv[i] == "-h" or argv[i] == "--help":
				self.usageExit()
			else:
				self.filenamelist.append(argv[i])
			i += 1

		if self.filenamelist == []:
			self.usageExit()

	def usageExit(self):
		sys.stderr.write("usage: %s package1 [ package2 ... ]\n" % \
				self.scriptname)
		sys.exit(1)

	def msg(self, s):
		sys.stderr.write("%s: %s\n" % (self.scriptname, s))

def parsePackageName(n):
	s = n.split("-")
	l = len(s)
	if l < 4:
		raise Exception("package name must be new style: %s" % n)

	else: # l >= 4
		try:
			i = s[-1].index('.')
			s[-1] = s[-1][0:i]
		except:
			pass
		return ["-".join(s[0:len(s)-3])] + s[-3:]

def main(argv):
	ac = AppContext(argv)

	for fn in ac.filenamelist:
		try:
			(pname, ver, arch, build) = parsePackageName(fn)
		except:
			ac.msg("ignoring non-standard package name: %s" % fn)
			continue

		#sys.stdout.write("%s-%s-%s-%s\n" % (pname, ver,arch,build))
		candnames = glob.glob(os.sep.join((PKGPATH, '%s-*' % pname)))
		if len(candnames) == 0:
			sys.stdout.write("%s: not installed\n" % pname)
		else:
			for inspname in candnames:
				inspname = os.path.basename(inspname)
				try:
					(ipname, iver, iarch, ibuild) = parsePackageName(inspname)
				except:
					ac.msg("ignoring non-standard package name (installed): %s" % inspname)
					continue
				if ipname != pname:
					continue  # not this package (different name)
				elif iver != ver:
					sys.stdout.write("%s-%s: installed version: %s\n" % \
							(pname, ver, iver))
				elif iarch != arch:
					sys.stdout.write("%s-%s: installed arch: %s\n" % \
							(pname, arch, iarch))
				elif ibuild != build:
					sys.stdout.write("%s-%s: installed build: %s\n" % \
							(pname, build, ibuild))
				else:
					#ac.msg("%s: installed and current" % (pname))
					pass

	return 0

if __name__ == "__main__": sys.exit(main(sys.argv))