compile

#!/usr/bin/env bash
# bin/compile <build-dir> <cache-dir>

# fail fast
set -eo pipefail

# debug
# set -x

# parse and derive params
BUILD_DIR=$1
CACHE_DIR=$2
ENV_DIR=$3

LP_DIR=`cd $(dirname $0); cd ..; pwd`

function error() {
  echo " !     $*" >&2
  exit 1
}

function topic() {
  echo "-----> $*"
}

function indent() {
  c='s/^/       /'
  case $(uname) in
    Darwin) sed -l "$c";;
    *)      sed -u "$c";;
  esac
}

# Store which STACK we are running on in the cache to bust the cache if it changes
if [ -f $CACHE_DIR/.apt/STACK ]; then
  CACHED_STACK=$(cat "$CACHE_DIR/.apt/STACK")
else
  CACHED_STACK=$STACK
fi

# Ensure we store the STACK in the cache for next time.
mkdir -p "$CACHE_DIR/.apt"
echo "$STACK" > "$CACHE_DIR/.apt/STACK"

APT_CACHE_DIR="$CACHE_DIR/apt/cache"
APT_STATE_DIR="$CACHE_DIR/apt/state"

if [ $CACHED_STACK == $STACK ]; then
  # STACK has not changed
  topic "Reusing cache"
else
  # STACK changed
  topic "Detected Stack changes, flushing cache"
  rm -rf $APT_CACHE_DIR
fi

mkdir -p "$APT_CACHE_DIR/archives/partial"
mkdir -p "$APT_STATE_DIR/lists/partial"

case "${STACK}" in
  "heroku-20" | "heroku-22")
    PACKAGES="
      fonts-liberation
      libasound2
      libatk-bridge2.0-0
      libatk1.0-0
      libatspi2.0-0
      libcups2
      libdbus-1-3
      libdrm2
      libgbm1
      libgcc1
      libglib2.0-0
      libgtk-3-0
      libnspr4
      libnss3
      libpango-1.0-0
      libpangocairo-1.0-0
      libuuid1
      libx11-xcb1
      libxcb-dri3-0
      libxcomposite1
      libxcursor1
      libxdamage1
      libxfixes3
      libxi6
      libxkbcommon0
      libxrandr2
      libxshmfence1
      libxss1
      libxtst6
    "
    ;;
  "heroku-24")
    PACKAGES="
      fonts-liberation
      libasound2t64
      libatk-bridge2.0-0
      libatk1.0-0
      libatspi2.0-0
      libcups2
      libdbus-1-3
      libdrm2
      libgbm1
      libgcc1
      libglib2.0-0
      libgtk-3-0
      libnspr4
      libnss3
      libpango-1.0-0
      libpangocairo-1.0-0
      libuuid1
      libx11-xcb1
      libxcb-dri3-0
      libxcomposite1
      libxcursor1
      libxdamage1
      libxfixes3
      libxi6
      libxkbcommon0
      libxrandr2
      libxshmfence1
      libxss1
      libxtst6
    "
    ;;
  *)
    error "STACK must be 'heroku-20', 'heroku-22' or 'heroku-24', not '${STACK}'."
esac

APT_OPTIONS="-o debug::nolocking=true -o dir::cache=$APT_CACHE_DIR -o dir::state=$APT_STATE_DIR"
APT_FLAGS="--allow-downgrades --allow-remove-essential --allow-change-held-packages"

topic "Updating apt caches"
apt-get $APT_OPTIONS update | indent

for PACKAGE in $PACKAGES; do
  if [[ $PACKAGE == *deb ]]; then
    PACKAGE_NAME=$(basename $PACKAGE .deb)
    PACKAGE_FILE=$APT_CACHE_DIR/archives/$PACKAGE_NAME.deb

    topic "Fetching $PACKAGE"
    curl -s -L -z $PACKAGE_FILE -o $PACKAGE_FILE $PACKAGE 2>&1 | indent
  else
    topic "Fetching .debs for $PACKAGE"
    apt-get $APT_OPTIONS -y $APT_FLAGS -d install --reinstall $PACKAGE | indent
  fi
done

mkdir -p $BUILD_DIR/.apt

for DEB in $(ls -1 $APT_CACHE_DIR/archives/*.deb); do
  topic "Installing $(basename $DEB)"
  dpkg -x $DEB $BUILD_DIR/.apt/
done

topic "Writing profile script"
mkdir -p $BUILD_DIR/.profile.d
cat <<EOF >$BUILD_DIR/.profile.d/puppeteer.sh
export LD_LIBRARY_PATH="\$HOME/.apt/usr/lib/x86_64-linux-gnu:\$HOME/.apt/usr/lib/i386-linux-gnu:\$HOME/.apt/usr/lib:\$LD_LIBRARY_PATH"
export LIBRARY_PATH="\$HOME/.apt/usr/lib/x86_64-linux-gnu:\$HOME/.apt/usr/lib/i386-linux-gnu:\$HOME/.apt/usr/lib:\$LIBRARY_PATH"
export INCLUDE_PATH="\$HOME/.apt/usr/include:\$HOME/.apt/usr/include/x86_64-linux-gnu:\$INCLUDE_PATH"
export CPATH="\$INCLUDE_PATH"
export CPPPATH="\$INCLUDE_PATH"
export PKG_CONFIG_PATH="\$HOME/.apt/usr/lib/x86_64-linux-gnu/pkgconfig:\$HOME/.apt/usr/lib/i386-linux-gnu/pkgconfig:\$HOME/.apt/usr/lib/pkgconfig:\$PKG_CONFIG_PATH"
EOF

export LD_LIBRARY_PATH="$BUILD_DIR/.apt/usr/lib/x86_64-linux-gnu:$BUILD_DIR/.apt/usr/lib/i386-linux-gnu:$BUILD_DIR/.apt/usr/lib:$LD_LIBRARY_PATH"
export LIBRARY_PATH="$BUILD_DIR/.apt/usr/lib/x86_64-linux-gnu:$BUILD_DIR/.apt/usr/lib/i386-linux-gnu:$BUILD_DIR/.apt/usr/lib:$LIBRARY_PATH"
export INCLUDE_PATH="$BUILD_DIR/.apt/usr/include:$BUILD_DIR/.apt/usr/include/x86_64-linux-gnu:$INCLUDE_PATH"
export CPATH="$INCLUDE_PATH"
export CPPPATH="$INCLUDE_PATH"
export PKG_CONFIG_PATH="$BUILD_DIR/.apt/usr/lib/x86_64-linux-gnu/pkgconfig:$BUILD_DIR/.apt/usr/lib/i386-linux-gnu/pkgconfig:$BUILD_DIR/.apt/usr/lib/pkgconfig:$PKG_CONFIG_PATH"

#give environment to later buildpacks
export | grep -E -e ' (LD_LIBRARY_PATH|LIBRARY_PATH|INCLUDE_PATH|CPATH|CPPPATH|PKG_CONFIG_PATH)='  > "$LP_DIR/export"

topic "Rewrite package-config files"
find $BUILD_DIR/.apt -type f -ipath '*/pkgconfig/*.pc' | xargs --no-run-if-empty -n 1 sed -i -e 's!^prefix=\(.*\)$!prefix='"$BUILD_DIR"'/.apt\1!g'