Index: ipkg-utils/ipkg-make-index
===================================================================
--- ipkg-utils.orig/ipkg-make-index	2005-03-20 18:10:54.000000000 +0000
+++ ipkg-utils/ipkg-make-index	2006-07-24 09:18:16.000000000 +0100
@@ -37,6 +37,21 @@
      if os.path.exists(pkg_dir + "/" + filename + ".asc"):
           os.rename(pkg_dir + "/" + filename + ".asc", locale_dir + "/" + filename + ".asc")
 
+def md5sum(file):
+     import md5
+     sum = md5.new()
+     f = open(file, "r")
+     while 1:
+          data = f.read(1024)
+          if not data: break
+          sum.update(data)
+     f.close()
+     if sys.version[:1] > '2':
+          # when using Python 2.0 or newer
+          return sum.hexdigest()
+     else:
+          return string.join(map((lambda x:"%02x" % ord(x)),sum.digest()),'')
+
 old_filename = None
 packages_filename = None
 filelist_filename = "Packages.filelist"
@@ -87,7 +102,7 @@
 files.sort()
 for filename in files:
      basename = os.path.basename(filename)
-     if old_pkg_hash.has_key(basename):
+     if old_pkg_hash.has_key(basename) and old_pkg_hash[basename].md5 == md5sum(filename) and old_pkg_hash[basename].size == os.stat(filename)[6]:
           if (verbose):
                sys.stderr.write("Found %s in Packages\n" % (filename,))
           pkg = old_pkg_hash[basename]
Index: ipkg-utils/ipkg.py
===================================================================
--- ipkg-utils.orig/ipkg.py	2005-01-20 23:09:10.000000000 +0000
+++ ipkg-utils/ipkg.py	2006-07-24 09:16:44.000000000 +0100
@@ -210,8 +210,13 @@
                     value = value + '\n' + line
                 if name == 'size':
                     self.size = int(value)
+	        elif name == 'md5sum':
+                    self.md5 = value
                 elif self.__dict__.has_key(name):
                     self.__dict__[name] = value
+		else:
+		    print "Lost field %s, %s" % (name,value)
+
                 if line[0] == '\n':
                     return # consumes one blank line at end of package descriptoin
             else: