diff --git a/debian/copyright b/debian/copyright
index f1c5b02..2bfa848 100644
--- a/debian/copyright
+++ b/debian/copyright
@@ -194,10 +194,10 @@ Files: doc/pull-debian-debdiff.1,
        ubuntutools/update_maintainer.py,
        update-maintainer,
        wrap-and-sort
-Copyright: 2010, Benjamin Drung <bdrung@ubuntu.com>
-           2010, Evan Broder <evan@ebroder.net>
-           2008, Siegfried-Angel Gevatter Pujals <rainct@ubuntu.com>
-           2010, Stefano Rivera <stefanor@ubuntu.com>
+Copyright: 2010,      Benjamin Drung <bdrung@ubuntu.com>
+           2010,      Evan Broder <evan@ebroder.net>
+           2008,      Siegfried-Angel Gevatter Pujals <rainct@ubuntu.com>
+           2010-2011, Stefano Rivera <stefanor@ubuntu.com>
 License: ISC
  Permission to use, copy, modify, and/or distribute this software for any
  purpose with or without fee is hereby granted, provided that the above
diff --git a/pull-debian-debdiff b/pull-debian-debdiff
index 053f5c5..5e68237 100755
--- a/pull-debian-debdiff
+++ b/pull-debian-debdiff
@@ -2,7 +2,7 @@
 # pull-debian-debdiff - find and download a specific version of a Debian
 #                       package and its immediate parent to generate a debdiff.
 #
-# Copyright (C) 2010, Stefano Rivera <stefanor@ubuntu.com>
+# Copyright (C) 2010-2011, Stefano Rivera <stefanor@ubuntu.com>
 # Inspired by a tool of the same name by Kees Cook.
 #
 # Permission to use, copy, modify, and/or distribute this software for any
@@ -105,19 +105,7 @@ def main():
         Logger.error(str(e))
         sys.exit(1)
     oldpkg.unpack()
-
-    cmd = ['debdiff', oldpkg.dsc_name, newpkg.dsc_name]
-    difffn = newpkg.dsc_name[:-3] + 'debdiff'
-    Logger.command(cmd + ['> %s' % difffn])
-    debdiff_file = open(difffn, 'w')
-    if subprocess.call(cmd, stdout=debdiff_file) > 2:
-        Logger.error('Debdiff failed.')
-        sys.exit(1)
-    debdiff_file.close()
-    cmd = ('diffstat', '-p0', difffn)
-    Logger.command(cmd)
-    subprocess.check_call(cmd)
-    print 'file://' + os.path.abspath(difffn)
+    print 'file://' + oldpkg.debdiff(newpkg, diffstat=True)
 
 if __name__ == '__main__':
     main()
diff --git a/ubuntutools/archive.py b/ubuntutools/archive.py
index e144557..f337240 100644
--- a/ubuntutools/archive.py
+++ b/ubuntutools/archive.py
@@ -1,7 +1,7 @@
 # archive.py - Functions for dealing with Debian source packages, archives,
 #              and mirrors.
 #
-# Copyright (C) 2010, Stefano Rivera <stefanor@ubuntu.com>
+# Copyright (C) 2010-2011, Stefano Rivera <stefanor@ubuntu.com>
 #
 # Permission to use, copy, modify, and/or distribute this software for any
 # purpose with or without fee is hereby granted, provided that the above
@@ -27,6 +27,8 @@ Approach:
 3. Verify checksums.
 """
 
+from __future__ import with_statement
+
 import hashlib
 import os.path
 import subprocess
@@ -74,13 +76,12 @@ class Dsc(debian.deb822.Dsc):
             if os.path.getsize(pathname) != size:
                 return False
             hash_func = getattr(hashlib, alg)()
-            f = open(pathname, 'rb')
-            while True:
-                buf = f.read(hash_func.block_size)
-                if buf == '':
-                    break
-                hash_func.update(buf)
-            f.close()
+            with open(pathname, 'rb') as f:
+                while True:
+                    buf = f.read(hash_func.block_size)
+                    if buf == '':
+                        break
+                    hash_func.update(buf)
             return hash_func.hexdigest() == digest
         return False
 
@@ -270,16 +271,15 @@ class SourcePackage(object):
         except urllib2.HTTPError:
             return False
 
-        out = open(pathname, 'wb')
-        while True:
-            block = in_.read(10240)
-            if block == '':
-                break
-            out.write(block)
-            Logger.stdout.write('.')
-            Logger.stdout.flush()
+        with open(pathname, 'wb') as out:
+            while True:
+                block = in_.read(10240)
+                if block == '':
+                    break
+                out.write(block)
+                Logger.stdout.write('.')
+                Logger.stdout.flush()
         in_.close()
-        out.close()
         Logger.stdout.write(' done\n')
         Logger.stdout.flush()
         if self.dsc and not url.endswith('.dsc'):
@@ -313,6 +313,24 @@ class SourcePackage(object):
         Logger.command(cmd)
         subprocess.check_call(cmd, cwd=self.workdir)
 
+    def debdiff(self, newpkg, diffstat=False):
+        """Write a debdiff comparing this src pkg to a newer one.
+        Optionally print diffstat.
+        Return the debdiff filename.
+        """
+        cmd = ['debdiff', self.dsc_name, newpkg.dsc_name]
+        difffn = newpkg.dsc_name[:-3] + 'debdiff'
+        Logger.command(cmd + ['> %s' % difffn])
+        with open(difffn, 'w') as f:
+            if subprocess.call(cmd, stdout=f, cwd=self.workdir) > 2:
+                Logger.error('Debdiff failed.')
+                sys.exit(1)
+        if diffstat:
+            cmd = ('diffstat', '-p1', difffn)
+            Logger.command(cmd)
+            subprocess.check_call(cmd)
+        return os.path.abspath(difffn)
+
 
 class DebianSourcePackage(SourcePackage):
     "Download / unpack a Debian source package"