python 3 compatibility

bin/compile

@@ -150,6 +150,9 @@ mkdir -p $(dirname $PROFILE_PATH)
 # Install Python.
 source $BIN_DIR/steps/python
 
+# Sanity check for setuptools/distribute.
+source $BIN_DIR/steps/setuptools
+
 # Uninstall removed dependencies with Pip.
 source $BIN_DIR/steps/pip-uninstall
 
@@ -159,6 +162,9 @@ 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
 

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 $BIN_DIR/utils
+
+bpwatch start libffi_install
+
+# If pylibmc exists within requirements, use vendored cryptography.
+if (pip-grep -s requirements.txt cffi crytography &> /dev/null) then
+
+  if [ -d ".heroku/vendor/lib/libffi-3.1.1" ]; then
+    export LIBFFI=$(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/pylibmc

@@ -15,12 +15,13 @@ VENDORED_MEMCACHED="http://lang-python.s3.amazonaws.com/$STACK/libraries/vendor/
 # 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
 
-  if [ -d "vendor/lib/sasl2" ]; then
+  if [ -d ".heroku/vendor/lib/sasl2" ]; then
     export LIBMEMCACHED=$(pwd)/vendor
   else
     echo "-----> Noticed pylibmc. Bootstrapping libmemcached."

bin/steps/setuptools

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+# Syntax sugar.
+source $BIN_DIR/utils
+
+if (pip-grep -s requirements.txt setuptools distribute &> /dev/null) then
+
+  puts-warn 'The package setuptools/distribute is listed in requirements.txt.'
+  puts-warn 'Please remove to ensure expected behavior. '
+
+fi

builds/libraries/libffi

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+OUT_PREFIX=$1
+
+# Use new path, containing autoconf.
+export PATH="/app/.heroku/python/bin/:$PATH"
+hash -r
+
+
+echo "Building libffi..."
+
+SOURCE_TARBALL='http://cl.ly/2s1t1u3v0N0I/download/libffi-3.1.tar'
+
+curl -L $SOURCE_TARBALL | tar x
+
+cd libffi-3.1
+./configure --prefix=$OUT_PREFIX --disable-static &&
+make
+make install
+
+# Cleanup
+cd ..

builds/libraries/vendor/libffi

@@ -1,6 +1,5 @@
 #!/usr/bin/env bash
-# Build Path: /app/.heroku/python/
-# Build Deps: libraries/autoconf
+# Build Path: /app/.heroku/vendor/
 
 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='ftp://sourceware.org/pub/libffi/libffi-3.1.tar.gz'
 
-curl -L $SOURCE_TARBALL | tar xz
-mv libffi-master libffi
+curl -L $SOURCE_TARBALL | tar x
 
-cd libffi
-./autogen.sh
-./configure --prefix=$OUT_PREFIX --enable-shared
+cd libffi-3.1
+./configure --prefix=$OUT_PREFIX --disable-static &&
 make
 make install
 

builds/runtimes/pypy-2.3

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
-# Build Deps: libraries/sqlite
+# Build Deps: libraries/sqlite, libraries/libffi
 
 # NOTICE: This formula only works for the cedar-14 stack, not cedar.
 

vendor/pip-pop/pip-diff

@@ -79,18 +79,18 @@ def diff(r1, r2, include_fresh=False, include_stale=False):
         r1 = Requirements(r1)
         r2 = Requirements(r2)
     except ValueError:
-        print 'There was a problem loading the given requirements files.'
+        print('There was a problem loading the given requirements files.')
         exit(os.EX_NOINPUT)
 
     results = r1.diff(r2, ignore_versions=True)
 
     if include_fresh:
         for line in results['fresh']:
-            print line.project_name if include_versions else line
+            print(line.project_name if include_versions else line)
 
     if include_stale:
         for line in results['stale']:
-            print line.project_name if include_versions else line
+            print(line.project_name if include_versions else line)
 
 
 

vendor/pip-pop/pip-grep

@@ -41,7 +41,7 @@ def grep(reqfile, packages, silent=False):
     except ValueError:
 
         if not silent:
-            print 'There was a problem loading the given requirement file.'
+            print('There was a problem loading the given requirement file.')
 
         exit(os.EX_NOINPUT)
 
@@ -52,12 +52,12 @@ def grep(reqfile, packages, silent=False):
             if requirement.req.project_name in packages:
 
                 if not silent:
-                    print 'Package {} found!'.format(requirement.req.project_name)
+                    print('Package {} found!'.format(requirement.req.project_name))
 
                 exit(0)
 
     if not silent:
-        print 'Not found.'.format(requirement.req.project_name)
+        print('Not found.'.format(requirement.req.project_name))
 
     exit(1)