duplicity 0.6.23

Include pip lockfile/paramiko dependencies.

Closes Homebrew/legacy-homebrew#26393.
Closes Homebrew/legacy-homebrew#26417.

Formula/duplicity.rb

@@ -2,17 +2,33 @@
 
 class Duplicity < Formula
   homepage 'http://www.nongnu.org/duplicity/'
-  url 'http://code.launchpad.net/duplicity/0.6-series/0.6.22/+download/duplicity-0.6.22.tar.gz'
-  sha1 'afa144f444148b67d7649b32b80170d917743783'
+  url 'http://code.launchpad.net/duplicity/0.6-series/0.6.23/+download/duplicity-0.6.23.tar.gz'
+  sha1 '0b8664d55c24957b3b19e903c0d69673f2bfa166'
 
   depends_on :python
   depends_on 'librsync'
   depends_on 'gnupg'
 
   option :universal
 
+  resource 'lockfile' do
+    url 'https://pypi.python.org/packages/source/l/lockfile/lockfile-0.9.1.tar.gz'
+    sha1 '9870cc7e7d4b23f0b6c39cf6ba597c87871ac6de'
+  end
+
+  resource 'paramiko' do
+    url 'https://pypi.python.org/packages/source/p/paramiko/paramiko-1.12.1.tar.gz'
+    sha1 '3809737533b3055b9822a86bee6bd1629144204d'
+  end
+
   def install
     ENV.universal_binary if build.universal?
+
+    ENV.prepend_create_path 'PYTHONPATH', libexec+'lib/python2.7/site-packages'
+    install_args = [ "setup.py", "install", "--prefix=#{libexec}" ]
+    resource('lockfile').stage { system "python", *install_args }
+    resource('paramiko').stage { system "python", *install_args }
+
     system "python", "setup.py", "install", "--prefix=#{prefix}"
 
     bin.env_script_all_files(libexec+'bin', :PYTHONPATH => ENV['PYTHONPATH'])