preliminary test and implementation for iojs support

bin/compile

@@ -33,6 +33,7 @@ export NODE_MODULES_CACHE=${NODE_MODULES_CACHE:-true}
 
 ####### Determine current state
 
+iojs_engine=$(read_json "$build_dir/package.json" ".engines.iojs")
 node_engine=$(read_json "$build_dir/package.json" ".engines.node")
 node_previous=$(file_contents "$cache_dir/node/node-version")
 npm_engine=$(read_json "$build_dir/package.json" ".engines.npm")
@@ -49,7 +50,12 @@ warn_node_modules "$modules_source"
 ####### Vendor in binaries
 
 head "Installing binaries"
-install_node
+if [ "$iojs_engine" == "" ]; then
+  install_node
+else
+  install_iojs
+fi
+node_engine=`node --version`
 install_npm
 
 ####### Build the project's dependencies

bin/test

@@ -18,6 +18,14 @@ testDetectWithoutPackageJson() {
   assertCapturedError 1 ""
 }
 
+testIoJs() {
+  compile "iojs"
+  assertCaptured "Node engine:         1.0."
+  assertCaptured "(iojs)"
+  assertCaptured "detected node version: v1.0."
+  assertCapturedSuccess
+}
+
 testNoVersion() {
   compile "no-version"
   assertCaptured "Node engine:         unspecified"

lib/build.sh

@@ -55,12 +55,16 @@ get_modules_cached() {
 
 show_current_state() {
   echo ""
-  info "Node engine:         ${node_engine:-unspecified}"
+  if [ "$iojs_engine" == "" ]; then
+    info "Node engine:         ${node_engine:-unspecified}"
+  else
+    achievement "iojs"
+    info "Node engine:         $iojs_engine (iojs)"
+  fi
   info "Npm engine:          ${npm_engine:-unspecified}"
   info "Start mechanism:     ${start_method:-none}"
   info "node_modules source: ${modules_source:-none}"
   info "node_modules cached: $modules_cached"
-
   echo ""
 
   printenv | grep ^NPM_CONFIG_ | indent
@@ -85,6 +89,24 @@ install_node() {
   PATH=$heroku_dir/node/bin:$PATH
 }
 
+install_iojs() {
+  # Resolve non-specific iojs versions using semver.herokuapp.com
+  if ! [[ "$node_engine" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
+    info "Resolving iojs version ${iojs_engine:-(latest stable)} via semver.io..."
+    iojs_engine=$(curl --silent --get --data-urlencode "range=${iojs_engine}" https://semver.herokuapp.com/iojs/resolve)
+  fi
+
+  # TODO: remove nightly, point at /dist once that's available
+  info "Downloading and installing iojs $iojs_engine..."
+  download_url="https://iojs.org/download/nightly/v$iojs_engine-nightly201501135ea716d895/iojs-v$iojs_engine-nightly201501135ea716d895-linux-x64.tar.gz"
+  curl $download_url -s -o - | tar xzf - -C /tmp
+
+  # Move iojs/node (and npm) binaries into .heroku/node and make them executable
+  mv /tmp/iojs-v$iojs_engine-nightly201501135ea716d895-linux-x64/* $heroku_dir/node
+  chmod +x $heroku_dir/node/bin/*
+  PATH=$heroku_dir/node/bin:$PATH
+}
+
 install_npm() {
   # Optionally bootstrap a different npm version
   if [ "$npm_engine" != "" ]; then

lib/common.sh

@@ -21,6 +21,12 @@ warning() {
   echo "" >> $warnings
 }
 
+achievement() {
+  local msg=$1
+  echo "       ACHIEVEMENT UNLOCKED: $msg :)"
+  echo ""
+}
+
 file_contents() {
   if test -f $1; then
     echo "$(cat $1)"

test/iojs/package.json

+{
+  "name": "node-buildpack-test-app",
+  "version": "0.0.1",
+  "description": "node buildpack integration test app",
+  "repository" : {
+    "type" : "git",
+    "url" : "http://github.com/example/example.git"
+  },
+  "dependencies": {
+    "hashish": "*"
+  },
+  "engines": {
+    "iojs": "1.0.x"
+  },
+  "scripts": {
+    "postinstall": "echo \"detected node version:\" `node --version`"
+  }
+}