go on a diet

bin/compile

 #!/usr/bin/env bash
-# bin/compile <build-dir> <cache-dir>
 
-# fail fast
-set -e
+set -e    # fail fast
+# set -x  # debug
 
-# debug
-# set -x
-
-# clean up leaking environment
-unset GIT_DIR
-
-# config
-SCONS_VERSION="1.2.0"
-S3_BUCKET="heroku-buildpack-nodejs"
-
-# parse and derive params
 BUILD_DIR=$1
 CACHE_DIR=$2
-LP_DIR=`cd $(dirname $0); cd ..; pwd`
-
-function error() {
-  echo " !     $*" >&2
-  exit 1
-}
-
-function mktmpdir() {
-  dir=$(mktemp -t node-$1-XXXX)
-  rm -rf $dir
-  mkdir -p $dir
-  echo $dir
-}
-
-function indent() {
-  c='s/^/       /'
-  case $(uname) in
-    Darwin) sed -l "$c";;
-    *)      sed -u "$c";;
-  esac
-}
 
-function run_npm() {
-  command="$1"
+source support/helpers.sh
 
-  cd $BUILD_DIR
-  HOME="$BUILD_DIR" $VENDORED_NODE/bin/node $VENDORED_NPM/cli.js $command 2>&1 | indent
+# download latest stable version of node
+# detect desired node version in package.json using semver
 
-  if [ "${PIPESTATUS[*]}" != "0 0" ]; then
-    echo " !     Failed to $command dependencies with npm"
-    exit 1
-  fi
-}
 
-function manifest_versions() {
-  curl "http://${S3_BUCKET}.s3.amazonaws.com/manifest.${1}" -s -o - | tr -s '\n' ' '
-}
+# if !desired
+#   (cached) ? cached : latest-stable
+# else
+#   (latest-stable satisfies desired) ? latest-stable : download
 
-function resolve_version() {
-  available_versions="$1"
-  requested_version="$2"
-  default_version="$3"
+# if desired and cached are absent, use latest
+# if desired is absent and cache is present, use cached
+# if desired is ">" and differs from cached and latest-stable, download
+# if desired is specific and differs from cached and latest-stable, download
 
-  args=""
-  for version in $available_versions; do args="${args} -v \"${version}\""; done
-
-  if [ "$2" == "" ]; then
-    args="${args} -r \"${default_version}\"";
-  else
-    args="${args} -r \"${requested_version}\"";
-  fi
+semver.satisfies('0.10.15', '>=0.10.x')
 
-  evaluated_versions=$(eval $bootstrap_node/bin/node $LP_DIR/vendor/node-semver/bin/semver ${args} || echo "")
-  echo "$evaluated_versions" | tail -n 1
-}
-
-function package_engine_version() {
-  version=$(cat $BUILD_DIR/package.json | $bootstrap_node/bin/node $LP_DIR/vendor/json/json engines.$1 2>/dev/null)
-  if [ $? == 0 ]; then
-    echo $version | sed -e 's/\([<>=]\) /\1/g'
-  fi
-}
 
-function package_resolve_version() {
-  engine="$1"
-  resolved_version=$(resolve_version "${engine_versions[$engine]}" "${engine_requests[$engine]}" "${engine_defaults[$engine]}")
-
-  if [ "${resolved_version}" == "" ]; then
-    error "Requested engine $engine version ${engine_requests[$engine]} does not match available versions: ${engine_versions[$engine]}"
-  else
-    echo $resolved_version
-  fi
-}
-
-function package_download() {
-  engine="$1"
-  version="$2"
-  location="$3"
-
-  mkdir -p $location
-  package="http://${S3_BUCKET}.s3.amazonaws.com/$engine-$version.tgz"
-  curl $package -s -o - | tar xzf - -C $location
-}
+package="http://s3pository.heroku.com/$engine-$version.tgz"
+curl $package -s -o - | tar xzf - -C $location
 
 function cat_npm_debug_log() {
   if [ -f $BUILD_DIR/npm-debug.log ]; then
     cat $BUILD_DIR/npm-debug.log
   fi
 }
-
 trap cat_npm_debug_log EXIT
 
-bootstrap_node=$(mktmpdir bootstrap_node)
-package_download "nodejs" "0.4.7" $bootstrap_node
-
-# make some associative arrays
-declare -A engine_versions
-declare -A engine_defaults
-declare -A engine_requests
-
-engine_defaults["node"]="0.10.x"
-engine_defaults["npm"]="1.3.x"
-
-engine_versions["node"]=$(manifest_versions "nodejs")
-engine_requests["node"]=$(package_engine_version "node")
-
-engine_versions["npm"]=$(manifest_versions "npm")
-engine_requests["npm"]=$(package_engine_version "npm")
-
 echo "-----> Resolving engine versions"
 
-# add a warning if no version of node specified
-if [ "${engine_requests["node"]}" == "" ]; then
-  echo
-  echo "WARNING: No version of Node.js specified in package.json, see:" | indent
-  echo "https://devcenter.heroku.com/articles/nodejs-support#versions" | indent
-  echo
-fi
-
 NODE_VERSION=$(package_resolve_version "node")
-echo "Using Node.js version: ${NODE_VERSION}" | indent
-
-NPM_VERSION=$(package_resolve_version "npm")
-echo "Using npm version: ${NPM_VERSION}" | indent
-
-# cache directories
-CACHE_STORE_DIR="$CACHE_DIR/node_modules/$NODE_VERSION/$NPM_VERSION"
-CACHE_TARGET_DIR="$BUILD_DIR/node_modules"
-
-# s3 packages
-NODE_PACKAGE="http://${S3_BUCKET}.s3.amazonaws.com/nodejs-${NODE_VERSION}.tgz"
-NPM_PACKAGE="http://${S3_BUCKET}.s3.amazonaws.com/npm-${NPM_VERSION}.tgz"
-SCONS_PACKAGE="http://${S3_BUCKET}.s3.amazonaws.com/scons-${SCONS_VERSION}.tgz"
+echo "Using node version: ${NODE_VERSION}" | indent
 
 # vendor directories
 VENDORED_NODE="$(mktmpdir node)"
 VENDORED_NPM="$(mktmpdir npm)"
 VENDORED_SCONS="$(mktmpdir scons)"
 
-# download and unpack packages
-echo "-----> Fetching Node.js binaries"
-package_download "nodejs" "${NODE_VERSION}" "${VENDORED_NODE}"
-package_download "npm" "${NPM_VERSION}" "${VENDORED_NPM}"
-package_download "scons" "${SCONS_VERSION}" "${VENDORED_SCONS}"
+echo "-----> Fetching node binary"
 
-# vendor node into the slug
+echo "-----> Vendoring node binary into slug"
 PATH="$BUILD_DIR/bin:$PATH"
-echo "-----> Vendoring node into slug"
 mkdir -p "$BUILD_DIR/bin"
 cp "$VENDORED_NODE/bin/node" "$BUILD_DIR/bin/node"
 
@@ -174,12 +58,7 @@ INCLUDE_PATH="$VENDORED_NODE/include"
 export CPATH="$INCLUDE_PATH:$CPATH"
 export CPPPATH="$INCLUDE_PATH:$CPPPATH"
 
-# install dependencies with npm
 echo "-----> Installing dependencies with npm"
 run_npm "install --production"
 run_npm "rebuild"
 echo "Dependencies installed" | indent
-
-echo "-----> Building runtime environment"
-mkdir -p $BUILD_DIR/.profile.d
-echo "export PATH=\"\$HOME/bin:\$HOME/node_modules/.bin:\$PATH\"" > $BUILD_DIR/.profile.d/nodejs.sh