suppress pip-grep errors

bin/compile

@@ -159,11 +159,14 @@ source $BIN_DIR/steps/mercurial
 # Pylibmc support.
 source $BIN_DIR/steps/pylibmc
 
+# Libffi support.
+source $BIN_DIR/steps/cryptography
+
 # Install dependencies with Pip.
 source $BIN_DIR/steps/pip-install
 
 # Django collectstatic support.
-source $BIN_DIR/steps/collectstatic
+sub-env $BIN_DIR/steps/collectstatic
 
 
 # ### Finalize

bin/steps/cryptography

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+
+# This script serves as the Pylibmc build step of the
+# [**Python Buildpack**](https://github.com/heroku/heroku-buildpack-python)
+# compiler.
+#
+# A [buildpack](http://devcenter.heroku.com/articles/buildpacks) is an
+# adapter between a Python application and Heroku's runtime.
+#
+# This script is invoked by [`bin/compile`](/).
+
+# The location of the pre-compiled cryptography binary.
+VENDORED_LIBFFI="http://lang-python.s3.amazonaws.com/$STACK/libraries/vendor/libffi.tar.gz"
+
+PKG_CONFIG_PATH="/app/.heroku/vendor/lib/pkgconfig:$PKG_CONFIG_PATH"
+
+# Syntax sugar.
+source $BIN_DIR/utils
+
+bpwatch start libffi_install
+
+# If pylibmc exists within requirements, use vendored cryptography.
+if (pip-grep -s requirements.txt cffi pylibmc &> /dev/null) then
+
+  if [ -d ".heroku/vendor/lib/libffi-3.1.1" ]; then
+    export LIBFFI=$(pwd)/vendor
+  else
+    echo "-----> Noticed cffi. Bootstrapping libffi."
+    mkdir -p .heroku/vendor
+    # Download and extract cryptography into target vendor directory.
+    curl $VENDORED_LIBFFI -s | tar zxv -C .heroku/vendor &> /dev/null
+
+    export LIBFFI=$(pwd)/vendor
+  fi
+fi
+
+bpwatch stop libffi_install

bin/steps/pip-uninstall

@@ -3,7 +3,11 @@ set +e
 bpwatch start pip_uninstall
 if [[ -f .heroku/python/requirements-declared.txt ]]; then
 
-  pip-diff --stale .heroku/python/requirements-declared.txt requirements.txt > .heroku/python/requirements-stale.txt
+  cp .heroku/python/requirements-declared.txt requirements-declared.txt
+
+  pip-diff --stale requirements-declared.txt requirements.txt > .heroku/python/requirements-stale.txt
+
+  rm -fr requirements-declared.txt
 
   if [[ -s .heroku/python/requirements-stale.txt ]]; then
     puts-step "Uninstalling stale dependencies"

bin/steps/pylibmc

@@ -10,30 +10,27 @@
 # This script is invoked by [`bin/compile`](/).
 
 # The location of the pre-compiled libmemcached binary.
-VENDORED_MEMCACHED="http://cl.ly/0a191R3K160t1w1P0N25/vendor-libmemcached.tar.gz"
+VENDORED_MEMCACHED="http://lang-python.s3.amazonaws.com/$STACK/libraries/vendor/libmemcache.tar.gz"
 
 # Syntax sugar.
 source $BIN_DIR/utils
 
+
 bpwatch start pylibmc_install
 
 # If pylibmc exists within requirements, use vendored libmemcached.
-if (pip-grep -s requirements.txt pylibmc) then
+if (pip-grep -s requirements.txt pylibmc &> /dev/null) then
-  echo "-----> Noticed pylibmc. Bootstrapping libmemcached."
-  cd .heroku
 
-  if [ -d "vendor/lib/sasl2" ]; then
+  if [ -d ".heroku/vendor/lib/sasl2" ]; then
     export LIBMEMCACHED=$(pwd)/vendor
   else
+    echo "-----> Noticed pylibmc. Bootstrapping libmemcached."
+    mkdir -p .heroku/vendor
     # Download and extract libmemcached into target vendor directory.
-    curl -s -L -o tmp-libmemcached.tar.gz $VENDORED_MEMCACHED
+    curl $VENDORED_MEMCACHED -s | tar zxv -C .heroku/vendor &> /dev/null
-    tar -zxvf tmp-libmemcached.tar.gz > /dev/null
+
-    rm tmp-libmemcached.tar.gz
     export LIBMEMCACHED=$(pwd)/vendor
   fi
-
-  export LIBMEMCACHED=$(pwd)/vendor
-  cd ..
 fi
 
 bpwatch stop pylibmc_install

builds/libraries/vendor/libffi

@@ -1,6 +1,5 @@
 #!/usr/bin/env bash
-# Build Path: /app/.heroku/python/
+# Build Path: /app/.heroku/vendor/
-# Build Deps: libraries/autoconf
 
 OUT_PREFIX=$1
 
@@ -11,14 +10,12 @@ hash -r
 
 echo "Building libffi..."
 
-SOURCE_TARBALL='https://github.com/atgreen/libffi/archive/master.tar.gz'
+SOURCE_TARBALL='http://cl.ly/2s1t1u3v0N0I/download/libffi-3.1.tar'
 
-curl -L $SOURCE_TARBALL | tar xz
+curl -L $SOURCE_TARBALL | tar x
-mv libffi-master libffi
 
-cd libffi
+cd libffi-3.1
-./autogen.sh
+./configure --prefix=$OUT_PREFIX --disable-static &&
-./configure --prefix=$OUT_PREFIX --enable-shared
 make
 make install