Heroku buildpack env with working {detect,release}

.gitignore

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+tmp/
+.rvmrc

.rvmrc.example

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+rvm use 1.9.2@cabal-heroku-buildpack
+BUILDPACK_GHC_BASE_URL="http://www.haskell.org/ghc/dist"
+GHC_BOOTSTRAP_VERSION=7.0.4
+
+export GHC_BOOTSTRAP_VERSION BUILDPACK_GHC_BASE_URL
+
+# Aruba envvars
+ARUBA_REPORT_TEMPLATES=templates
+ARUBA_REPORT_DIR=doc
+
+export ARUBA_REPORT_TEMPLATES ARUBA_REPORT_DIR

Gemfile

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+source :rubygems
+
+group :testing do
+  gem 'aruba'
+end

Gemfile.lock

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+GEM
+  remote: http://rubygems.org/
+  specs:
+    aruba (0.4.11)
+      childprocess (>= 0.2.3)
+      cucumber (>= 1.1.1)
+      ffi (>= 1.0.11)
+      rspec (>= 2.7.0)
+    builder (3.0.0)
+    childprocess (0.3.1)
+      ffi (~> 1.0.6)
+    cucumber (1.1.5)
+      builder (>= 2.1.2)
+      diff-lcs (>= 1.1.2)
+      gherkin (~> 2.8.0)
+      json (>= 1.4.6)
+      term-ansicolor (>= 1.0.6)
+    diff-lcs (1.1.3)
+    ffi (1.0.11)
+    gherkin (2.8.0)
+      json (>= 1.4.6)
+    json (1.6.5)
+    rspec (2.8.0)
+      rspec-core (~> 2.8.0)
+      rspec-expectations (~> 2.8.0)
+      rspec-mocks (~> 2.8.0)
+    rspec-core (2.8.0)
+    rspec-expectations (2.8.0)
+      diff-lcs (~> 1.1.2)
+    rspec-mocks (2.8.0)
+    term-ansicolor (1.0.7)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  aruba

README.md

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+# GHC/Cabal Heroku Buildpack
+
+This is a custom Heroku buildpack for Haskell applications that are built
+using GHC and Cabal.
+
+## Version / Dependencies
+
+Based on the current (as of this writing) Haskell Platform (2011.4.0.0 ->
+GHC v7.0.4).
+
+Work will be done after some level of stability to update this buildpack
+to support GHC 7.4.x soon thereafter.
+
+The goal will be to allow some variance of GHC and Platform versions. At
+present there are zero plans to actively support GHC 6.x with this
+buildpack. If it happens to work, then great, otherwise you are free to fork
+this repository to make it work for your needs.
+
+## Status
+
+Experimental; in progress - still testing.
+
+## Usage
+
+Like other buildpacks you will need to specify the buildpack when creating
+your Heroku application. Something like the following:
+
+    heroku create --stack cedar --buildpack https://github.com/mbbx6spp/cabal-heroku-buildpack
+
+You will also need to specify environment variables after your app is
+created. For instance,
+
+    BUILDPACK_GHC_BASE_URL
+    BUILDPACK_PLATFORM_BASE_URL
+
+These should be your S3 base URL for the GHC bootstrap and Platform
+distributions respectively.
+
+More to be said, but I am too tired to write it now.
+
+Check back soon.
+
+## Contributors
+
+* Susan Potter [mbbx6spp on GitHub](https://github.com/mbbx6spp)
+
+

Rakefile

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+# encoding: utf-8
+require 'rubygems'
+require 'bundler'
+Bundler.setup(:testing)
+
+require 'cucumber/rake/task'
+
+def darwin?
+  os=%x[uname -s]
+  "Darwin" === os
+end
+
+Cucumber::Rake::Task.new do |t|
+  opts = defined?(JRUBY_VERSION) ? %w{--tags ~@jruby} : []
+  opts += %w{--tags ~@fails-on-darwin} if darwin?
+  t.cucumber_opts = opts
+end
+
+desc "Run Cucumber features"
+task :test => [:cucumber]
+
+task :default => :test

bin/compile

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+#!/usr/bin/env bash
+# bin/compile BUILD_DIR CACHE_DIR
+
+set -e
+
+source scripts/functions
+
+BUILD_DIR=$1
+CACHE_DIR=$2
+
+## CHECK BUILDPACK_GHC_BASE_URL is set
+if [ "$BUILDPACK_GHC_BASE_URL" != "" ]; then
+  arch=$(uname -m)
+  ghcver=$GHC_BOOTSTRAP_VERSION
+  bsdir=$CACHE_DIR/bootstrap
+  ghcurl="$BUILDPACK_GHC_BASE_URL/$ghcver/ghc-$ghcver-$arch-unknown-linux.tar.bz2"
+  echo "Info: bootstrap directory: ${bsdir}";
+  echo "Info: bootstrap URL: $ghcurl";
+  if [ -f "$bsdir.completed" ]; then
+    echo "Info: already downloaded GHC bootstrap version ${ghcver}";
+  else
+    echo "Info: downloading GHC $ghcver form $ghcurl";
+    $(downloadAndExtract $bsdir $ghcurl);
+    $(configureMakeInstall $bsdir/ghc-$ghcver $BUILD_DIR/bootstrap/ghc-$ghcver);
+    touch $bsdir.completed
+  fi;
+else
+  echo "Error: please set BUILDPACK_GHC_BASE_URL";
+  exit 1;
+fi

bin/detect

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+#!/usr/bin/env bash
+# bin/detect BUILD_DIR
+set -e
+
+BUILD_DIR=$1
+echo $BUILD_DIR
+
+CABAL_FILE="$(find $BUILD_DIR -maxdepth 1 -name '*.cabal' -print -quit)"
+
+# Check a *.cabal file exists at the root of the source tree
+if [[ -e $CABAL_FILE ]]; then
+  echo "GHC/Cabal" && exit 0
+else
+  echo "nada" && exit 1
+fi

bin/release

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+#!/usr/bin/env bash
+# bin/release BUILD_DIR
+
+BUILD_DIR=$1
+
+cat <<EOF
+---
+config_vars:
+  GHC_PACKAGE_PATH: "$BUILD_DIR/ghc-packages.conf:"
+  GHCRTS: "-M512m -c70 -H128m"
+  HASKELL_PLATFORM_VERSION: 2011.4.0.0
+  GHC_BOOTSTRAP_VERSION: 7.0.4
+  BUILDPACK_GHC_BASE_URL:
+  BUILDPACK_PLATFORM_BASE_URL:
+addons:
+  - shared-database:5mb
+default_process_types:
+EOF
+

features/detect.feature

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+Feature: Detect
+
+  In order to build and deploy an application
+  As the bin/detect script of the buildpack
+  I want to determine if the source tree is buildable
+
+  Scenario: no *.cabal file
+    When I run `detect ../features/fixtures/invaliddir`
+    Then the output should contain "nada"
+    And the exit status should be 1
+
+  Scenario: a *.cabal file
+    When I run `detect ../features/fixtures/validdir`
+    Then the output should contain "GHC/Cabal"
+    And the exit status should be 0

features/release.feature

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+Feature: Release
+
+  In order to build and deploy an application
+  As the bin/release script of the buildpack
+  I want to setup the build environment
+
+  Scenario: default
+    When I run `release`
+    Then the output should contain "addons:"
+    And  the output should contain "config_vars:"
+    And  the output should contain "default_process_types:"
+    And  the exit status should be 0

features/support/env.rb

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+require 'rubygems'
+require 'aruba/cucumber'
+require 'fileutils'
+require 'rspec/expectations'
+
+ENV['PATH'] = "#{File.expand_path(File.dirname(__FILE__) + '/../../bin')}#{File::PATH_SEPARATOR}#{ENV['PATH']}"
+
+Before do
+  @aruba_timeout_seconds = 5
+  @dirs = ["bin"]
+end
+
+Aruba.configure do |config|
+  config.before_cmd do |cmd|
+    puts "About to run '#{cmd}'"
+  end
+end

scripts/functions

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+
+function indent() {
+  c='s/^/       /'
+    case $(uname) in
+      Darwin) sed -l "$c";;
+  *)      sed -u "$c";;
+  esac
+}
+
+function clearEnvironment() {
+  unset GIT_DIR
+}
+
+function downloadAndExtract() {
+  mkdir -p $1 && curl $2 -o - | tar jxf - -C $1
+}
+
+function configureMakeInstall() {
+  pushd $1
+  echo -n "Info: configure --prefix=$2"
+  ./configure --prefix=$2;
+  echo "[OK]"
+  echo -n "Info: make"
+  make
+  echo "[OK]";
+  echo -n "Info: make install"
+  make install
+  echo "[OK]"
+  popd
+}
+
+function mkCompilerDir() {
+  local compilerDir=$CACHE_DIR/compilers/$1;
+  [[ ! -d "$compilerDir" ]]; mkdir -p $compilerDir;
+  echo $compilerDir;
+}
+