Update python-docutils build to use python3 and preserve cache

config/patches/readline/readline-6.2-curses-link.patch

+link readline directly to ncurses since it needs symbols from it
+
+upstream readline does this on purpose (no direct linking), but
+it doesn't make much sense in a Linux world
+
+--- a/support/shobj-conf
++++ b/support/shobj-conf
+@@ -42,7 +42,7 @@
+ SHOBJ_LIBS=
+
+ SHLIB_XLDFLAGS=
+-SHLIB_LIBS=
++SHLIB_LIBS='-lncurses -ltinfo'
+
+ SHLIB_DOT='.'
+ SHLIB_LIBPREF='lib'

config/software/python-docutils.rb

@@ -20,10 +20,9 @@ name "python-docutils"
 default_version "0.11"
-dependency "pip"
-dependency "python"
+dependency "python3"
 build do
   env = with_standard_compiler_flags(with_embedded_path)
-  command "#{install_dir}/embedded/bin/pip install --compile --build #{Time.now.to_i} docutils==#{version}", env: env
+  command "#{install_dir}/embedded/bin/pip3 install --compile docutils==#{version}", env: env
 end

config/software/python3.rb

+#
+# Copyright:: Copyright (c) 2013-2014 Chef Software, Inc.
+# Copyright:: Copyright (c) 2016 GitLab B.V.
+# License:: Apache License, Version 2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+name "python3"
+default_version "3.4.3"
+
+dependency "readline"
+dependency "ncurses"
+dependency "zlib"
+dependency "openssl"
+dependency "bzip2"
+
+source :url => "http://python.org/ftp/python/#{version}/Python-#{version}.tgz",
+       :md5 => '4281ff86778db65892c05151d5de738d'
+
+relative_path "Python-#{version}"
+
+LIB_PATH = %W(#{install_dir}/embedded/lib #{install_dir}/embedded/lib64 #{install_dir}/embedded/libexec #{install_dir}/lib #{install_dir}/lib64 #{install_dir}/libexec)
+
+env = {
+  "CFLAGS" => "-I#{install_dir}/embedded/include -O3 -g -pipe",
+  "LDFLAGS" => "-Wl,-rpath,#{LIB_PATH.join(',-rpath,')} -L#{LIB_PATH.join(' -L')} -I#{install_dir}/embedded/include"
+}
+
+build do
+  command ["./configure",
+           "--prefix=#{install_dir}/embedded",
+           "--enable-shared",
+           "--disable-sqlite3",
+           "--with-dbmliborder="].join(" "), env: env
+  make env: env
+  make "install", env: env
+
+  # There exists no configure flag to tell Python to not compile readline support :(
+  block do
+    FileUtils.rm_f(Dir.glob("#{install_dir}/lib/python3.4/lib-dynload/dbm.*"))
+  end
+end

config/software/readline.rb

+name "readline"
+default_version "6.2"
+
+# http://buildroot-busybox.2317881.n4.nabble.com/PATCH-readline-link-directly-against-ncurses-td24410.html
+# https://bugzilla.redhat.com/show_bug.cgi?id=499837
+# http://lists.osgeo.org/pipermail/grass-user/2003-September/010290.html
+# http://trac.sagemath.org/attachment/ticket/14405/readline-tinfo.diff
+dependency "ncurses"
+
+source :url => "ftp://ftp.cwru.edu/pub/bash/readline-6.2.tar.gz",
+       :md5 => "67948acb2ca081f23359d0256e9a271c"
+
+relative_path "#{name}-#{version}"
+
+build do
+  env = {
+      "CFLAGS" => "-I#{install_dir}/embedded/include",
+      "LDFLAGS" => "-Wl,-rpath,#{install_dir}/embedded/lib -L#{install_dir}/embedded/lib"
+  }
+
+  configure_command = [
+      "./configure",
+      "--with-curses",
+      "--prefix=#{install_dir}/embedded"
+  ].join(" ")
+
+  patch :source => "readline-6.2-curses-link.patch" , :plevel => 1
+  command configure_command, :env => env
+  command "make", :env => env
+  command "make install", :env => env
+
+end