#!/usr/bin/python2

# Generates a changelog between build trees.
#
# Usage: treediff tree1 tree2

timeformat="%a %b %d %Y"

import getopt
import string
import glob
import sys
import rpm
import os
import time
from stat import *

args = sys.argv[1:]

if not args or not args[0] or not args[1]:
   print "Usage: treediff newtree oldtree\n"
   sys.exit(-1)
tree1 = args[0]
tree2 = args[1]

new = []
axed = []
changed = []

def formatRPMChangeLogs(hdr, num = 3):
   s = []
   names = hdr[rpm.RPMTAG_CHANGELOGNAME]
   times = hdr[rpm.RPMTAG_CHANGELOGTIME]
   text = hdr[rpm.RPMTAG_CHANGELOGTEXT]
   if len(names) == 1:
        times = [times]
   for i in range(0, num):
      if num > len(names) -1:
	continue
      s.append("* %s %s" %(time.strftime(timeformat, time.gmtime(times[i])),
                           names[i]))
      s.append("%s\n" %(text[i]))
   return string.joinfields(s, "\n")

ts = rpm.TransactionSet()
ts.setVSFlags(-1)

filelist = os.listdir('%s/source/SRPMS/' % tree1)
filelist.sort()
for file in filelist:
   if file[-4:] != '.rpm': continue
   # is same version in old tree?
   if os.path.exists("%s/source/SRPMS/%s" %(tree2,file)):
      continue

   fd = os.open("%s/source/SRPMS/%s" %(tree1,file), os.O_RDONLY)
   h = ts.hdrFromFdno(fd)
   os.close(fd)

   oldversion = glob.glob("%s/source/SRPMS/%s*" %(tree2, h[rpm.RPMTAG_NAME]))
   if not oldversion:
      new.append('New package %s\n\t%s\n' % (h[rpm.RPMTAG_NAME], h[rpm.RPMTAG_SUMMARY]))
   else:
      fd = os.open(oldversion[0], os.O_RDONLY)
      oldh = ts.hdrFromFdno(fd)
      os.close(fd)
      newCL = string.split(formatRPMChangeLogs(h), "\n")
      oldCL = string.split(formatRPMChangeLogs(oldh), "\n")      
      clist = []
      if newCL and oldCL:
         while (newCL[0] != oldCL[0]):
            clist.append(newCL[0])
            newCL=newCL[1:]
            if not newCL:
               break
      elif newCL:
         clist = newCL
      if h[rpm.RPMTAG_EPOCH] is None:
         epoch = ""
      else:
         epoch = "%s:" %(h[rpm.RPMTAG_EPOCH],)
      nvr = "%s-%s%s-%s" % (h[rpm.RPMTAG_NAME], epoch, h[rpm.RPMTAG_VERSION], h[rpm.RPMTAG_RELEASE])
      hashes = "-" * len(nvr)
      changed.append("%s\n%s\n%s" % (nvr,hashes,string.join(clist,'\n')))

for file in os.listdir('%s/source/SRPMS/' % tree2):
   if file[-4:] != '.rpm': continue
   fd = os.open("%s/source/SRPMS/%s" %(tree2, file), os.O_RDONLY)
   h = ts.hdrFromFdno(fd)
   os.close(fd)
   if not glob.glob('%s/source/SRPMS/%s*' % (tree1, h[rpm.RPMTAG_NAME])):
      axed.append('Removed package %s\n' % (h[rpm.RPMTAG_NAME],))

if not changed:
	changed = [ '(none)', ]

print string.join(new,'\n'),'\n\n',string.join(axed,'\n'),'\nUpdated Packages:\n\n',string.join(changed,'\n')