compile

#!/usr/bin/env bash

set -e            # fail fast
set -o pipefail   # don't ignore exit codes when piping output
# set -x          # enable debugging

# Configure directories
build_dir=$1
cache_dir=$2
env_dir=$3
bp_dir=$(cd $(dirname $0); cd ..; pwd)

# CF Common
export BUILDPACK_PATH=$bp_dir
source $bp_dir/compile-extensions/lib/common
# END CF Common

# Load some convenience functions like status(), echo(), and indent()
source $bp_dir/bin/common.sh

# Fix leak
status "Resetting git environment"
unset GIT_DIR

# Output npm debug info on error
trap cat_npm_debug_log ERR

# Look in package.json's engines.node field for a semver range
semver_range=$(cat $build_dir/package.json | $bp_dir/vendor/jq -r .engines.node)

# Resolve node version using semver.io
if is_cached
then
  node_version=$($bp_dir/bin/node $bp_dir/lib/version_resolver.js "$semver_range")
else
  node_version=$(curl --silent --get --data-urlencode "range=${semver_range}" https://semver.io/node/resolve)
fi

# Exit if no possible node version found
if [ "$node_version" == "" ]; then
  status "Node Engine matching $semver_range is not provided by this buildpack. Please upgrade your buildpack to receive the latest resources."
  exit 1
fi

# Recommend using semver ranges in a safe manner
if [ "$semver_range" == "null" ]; then
  protip "Specify a node version in package.json"
  semver_range=""
elif [ "$semver_range" == "*" ]; then
  protip "Avoid using semver ranges like '*' in engines.node"
elif [ ${semver_range:0:1} == ">" ]; then
  protip "Avoid using semver ranges starting with '>' in engines.node"
fi

# Output info about requested range and resolved node version
if [ "$semver_range" == "" ]; then
  status "Defaulting to latest stable node: $node_version"
else
  status "Requested node range:  $semver_range"
  status "Resolved node version: $node_version"
fi

# Download node from Heroku's S3 mirror of nodejs.org/dist
status "Downloading and installing node"
node_url="http://s3pository.heroku.com/node/v$node_version/node-v$node_version-linux-x64.tar.gz"
(curl `translate_dependency_url $node_url` -s --fail -o - | tar xzf - -C $build_dir)  || (echo -e "\n-----> Resource $node_url does not exist." 1>&2 ; exit 22)

# Move node (and npm) into ./vendor and make them executable
mkdir -p $build_dir/vendor
mv $build_dir/node-v$node_version-linux-x64 $build_dir/vendor/node
chmod +x $build_dir/vendor/node/bin/*
PATH=$build_dir/vendor/node/bin:$PATH

# Run subsequent node/npm commands from the build path
cd $build_dir

# If node_modules directory is checked into source control then
# rebuild any native deps. Otherwise, restore from the build cache.
if test -d $build_dir/node_modules; then
  status "Found existing node_modules directory; skipping cache"
  status "Rebuilding any native dependencies"
  npm rebuild 2>&1 | indent
elif test -d $cache_dir/node/node_modules; then
  status "Restoring node_modules directory from cache"
  cp -r $cache_dir/node/node_modules $build_dir/

  status "Pruning cached dependencies not specified in package.json"
  npm prune --production 2>&1 | indent

  if test -f $cache_dir/node/.heroku/node-version && [ $(cat $cache_dir/node/.heroku/node-version) != "$node_version" ]; then
    status "Node version changed since last build; rebuilding dependencies"
    npm rebuild 2>&1 | indent
  fi

fi

# Scope config var availability only to `npm install`
(
  if [ -d "$env_dir" ]; then
    status "Exporting config vars to environment"
    export_env_dir $env_dir
  fi

  status "Installing dependencies"
  # Make npm output to STDOUT instead of its default STDERR
  npm install --userconfig $build_dir/.npmrc --production 2>&1 | indent
)

# Persist goodies like node-version in the slug
mkdir -p $build_dir/.heroku

# Save resolved node version in the slug for later reference
echo $node_version > $build_dir/.heroku/node-version

# Purge node-related cached content, being careful not to purge the top-level
# cache, for the sake of heroku-buildpack-multi apps.
rm -rf $cache_dir/node_modules # (for apps still on the older caching strategy)
rm -rf $cache_dir/node
mkdir -p $cache_dir/node

# If app has a node_modules directory, cache it.
if test -d $build_dir/node_modules; then
  status "Caching node_modules directory for future builds"
  cp -r $build_dir/node_modules $cache_dir/node
fi

# Copy goodies to the cache
cp -r $build_dir/.heroku $cache_dir/node

status "Cleaning up node-gyp and npm artifacts"
rm -rf "$build_dir/.node-gyp"
rm -rf "$build_dir/.npm"

# If Procfile is absent, try to create one using `npm start`
if [ ! -e $build_dir/Procfile ]; then
  npm_start=$(cat $build_dir/package.json | $bp_dir/vendor/jq -r .scripts.start)

  # If `scripts.start` is set in package.json, or a server.js file
  # is present in the app root, then create a default Procfile
  if [ "$npm_start" != "null" ] || [ -f $build_dir/server.js ]; then
    status "No Procfile found; Adding npm start to new Procfile"
    echo "web: npm start" > $build_dir/Procfile
  else
    status "Procfile not found and npm start script is undefined"
    protip "Create a Procfile or specify a start script in package.json"
  fi
fi

# Add SOX binary and libraries to path
status "Adding SOX library support"
tar xzf $bp_dir/vendor/sox.tar.gz -C $build_dir/vendor/

status "Adding FFMPEG library support"
curl 'http://johnvansickle.com/ffmpeg/releases/ffmpeg-release-64bit-static.tar.xz' -o $bp_dir/vendor/ffmpeg.tar.xz
tar xJf $bp_dir/vendor/ffmpeg.tar.xz -C $build_dir/vendor/


# Update the PATH
status "Building runtime environment"
mkdir -p $build_dir/.profile.d
echo "export PATH=\"\$HOME/vendor/node/bin:\$HOME/bin:\$HOME/node_modules/.bin:\$HOME/vendor/sox/bin:\$HOME/vendor/ffmpeg-3.0.2-64bit-static:\$PATH\";" > $build_dir/.profile.d/nodejs.sh
echo "export LD_LIBRARY_PATH=\"\$HOME/vendor/sox/lib/\";" >> $build_dir/.profile.d/nodejs.sh