Make sure we use Python 2.7.9 and OpenSSL 1.0.1 when building OSX binary

Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>

script/build-osx

@@ -1,5 +1,8 @@
 #!/bin/bash
 set -ex
+
+PATH="/usr/local/bin:$PATH"
+
 rm -rf venv
 virtualenv -p /usr/local/bin/python venv
 venv/bin/pip install -r requirements.txt

script/prepare-osx

@@ -2,20 +2,51 @@
 
 set -ex
 
+python_version() {
+  python -V 2>&1
+}
+
+openssl_version() {
+  python -c "import ssl; print ssl.OPENSSL_VERSION"
+}
+
+desired_python_version="2.7.9"
+desired_python_brew_version="2.7.9"
+python_formula="https://raw.githubusercontent.com/Homebrew/homebrew/1681e193e4d91c9620c4901efd4458d9b6fcda8e/Library/Formula/python.rb"
+
+desired_openssl_version="1.0.1j"
+desired_openssl_brew_version="1.0.1j_1"
+openssl_formula="https://raw.githubusercontent.com/Homebrew/homebrew/62fc2a1a65e83ba9dbb30b2e0a2b7355831c714b/Library/Formula/openssl.rb"
+
+PATH="/usr/local/bin:$PATH"
+
 if !(which brew); then
   ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
 fi
 
 brew update
 
-if [ ! -f /usr/local/bin/python ]; then
-  brew install python
+if !(python_version | grep "$desired_python_version"); then
+  if brew list | grep python; then
+    brew unlink python
+  fi
+
+  brew install "$python_formula"
+  brew switch python "$desired_python_brew_version"
 fi
 
-if [ -n "$(brew outdated | grep python)" ]; then
-  brew upgrade python
+if !(openssl_version | grep "$desired_openssl_version"); then
+  if brew list | grep openssl; then
+    brew unlink openssl
+  fi
+
+  brew install "$openssl_formula"
+  brew switch openssl "$desired_openssl_brew_version"
 fi
 
+echo "*** Using $(python_version)"
+echo "*** Using $(openssl_version)"
+
 if !(which virtualenv); then
   pip install virtualenv
 fi