function print_help() {
  echo "Usage: `basename $0` command [options]"
  echo ""
  echo "Commands:"
  echo "  status [site]    return status information about site configurations"
  echo "  init <site>      initialize site structure"
  echo "  update <site>    update to new version"
  echo ""
}

function site_init() {
  if [ ! $1 ]; then
    echo "ERROR: site parameter mandatory"
    exit 1
  fi
  CONF_PATH="$CONF_DIR/conf.d/$1.conf"
  if [ ! -f $CONF_PATH ]; then
    echo "Site configuration not found: " $1
    exit 1
  fi
  source $CONF_PATH
  if [ -f "$SITE_ROOT/w/public/index.php" ]; then
    echo "Cannot override an existing deployment: $SITE_ROOT/w"
    exit 1
  fi
  # cleanup previous broken deployment
  rm -rf $SITE_ROOT/slot0
  # create directory structure
  for dir in slot0 slot1; do
    mkdir -p $SITE_ROOT/$dir
    chown $FILE_OWNER:$FILE_GROUP $SITE_ROOT/$dir
  done
  target_dir="$SITE_ROOT/slot0"
  # fetch and extract release tarball
  umask 0027
  if [[ $SOURCE_TARBALL == http* ]]; then
    echo "Download from http!"
    curl $SOURCE_TARBALL | tar -xzv -C $target_dir --strip-components 1 --no-same-permissions
  else
    echo "extract from local file system"
    if [ ! -f $SOURCE_TARBALL ]; then
      echo "Source tarball not found: $SOURCE_TARBALL"
      exit 1
    fi
    tar -xzvf $SOURCE_TARBALL -C $target_dir --strip-components 1 --no-same-permissions
  fi
  chown -R $FILE_OWNER:$FILE_GROUP $target_dir
  umask 0022
  # link configuration files managed by puppet
  ln -sf /etc/openstackid/environment.php $target_dir/bootstrap/environment.php
  ln -sf /etc/openstackid/recaptcha.php $target_dir/app/config/packages/greggilbert/recaptcha/$LARAVEL_ENV/config.php
  ln -sf /etc/openstackid/database.php $target_dir/app/config/$LARAVEL_ENV/database.php
  ln -sf /etc/openstackid/log.php $target_dir/app/config/$LARAVEL_ENV/log.php
  # convert app/storage into symlink and set permissions
  mv $target_dir/app/storage $SITE_ROOT/
  chmod 02770 $SITE_ROOT/storage
  find $SITE_ROOT/storage/ -type d -exec chmod 0775 {} \;
  find $SITE_ROOT/storage/ -type f -exec chmod 0664 {} \;
  rm -rf $target_dir/app/storage
  ln -s $SITE_ROOT/storage $target_dir/app
  # populate application database
  cd $target_dir
  php artisan migrate --env=$LARAVEL_ENV
  php artisan db:seed --env=$LARAVEL_ENV
  # activate site
  rm -rf $SITE_ROOT/w
  ln -s $SITE_ROOT/slot0 $SITE_ROOT/w
}

function site_status() {
  if [ ! $1 ]; then
    echo "ERROR: site parameter mandatory"
    exit 1
  fi
  CONF_PATH="$CONF_DIR/conf.d/$1.conf"
  if [ ! -f $CONF_PATH ]; then
    echo "Site configuration not found: $1"
    exit 0
  fi
  source $CONF_PATH
  if [ ! -f "$SITE_ROOT/w/public/index.php" ]; then
    if [ -d "$SITE_ROOT/slot0" ]; then
      echo "PENDING"
    else
      echo "N/A"
      exit 1
    fi
  else
    echo "INSTALLED"
  fi
}

function site_update() {
  if [ ! $1 ]; then
    echo "ERROR: missing site parameter"
    exit 1
  fi
  CONF_PATH="$CONF_DIR/conf.d/$1.conf"
  if [ ! -f $CONF_PATH ]; then
    echo "Site configuration not found: $1"
    exit 0
  fi
  source $CONF_PATH
  SITE_LINK=`readlink -f $SITE_ROOT/w`
  ACTIVE_SLOT=`basename $SITE_LINK`
  case $ACTIVE_SLOT in
    slot0)
      TARGET_SLOT='slot1'
      ;;
    slot1)
      TARGET_SLOT='slot0'
      ;;
    *)
      echo "Invalid active slot"
      exit 1
  esac
  echo "Target slot: $TARGET_SLOT"
  target_dir="$SITE_ROOT/$TARGET_SLOT"
  rm -rf $target_dir
  mkdir $target_dir
  # fetch and extract release tarball
  umask 0027
  if [[ $SOURCE_TARBALL == http* ]]; then
    echo "Download from http!"
    curl $SOURCE_TARBALL | tar -xzv -C $target_dir --strip-components 1 --no-same-permissions
  else
    echo "extract from local file system"
    if [ ! -f $SOURCE_TARBALL ]; then
      echo "Source tarball not found: $SOURCE_TARBALL"
      exit 1
    fi
    tar -xzvf $SOURCE_TARBALL -C $target_dir --strip-components 1 --no-same-permissions
  fi
  chown -R $FILE_OWNER:$FILE_GROUP $target_dir
  umask 0022
  # link configuration files managed by puppet
  ln -sf /etc/openstackid/environment.php $target_dir/bootstrap/environment.php
  ln -sf /etc/openstackid/recaptcha.php $target_dir/app/config/packages/greggilbert/recaptcha/$LARAVEL_ENV/config.php
  ln -sf /etc/openstackid/database.php $target_dir/app/config/$LARAVEL_ENV/database.php
  ln -sf /etc/openstackid/log.php $target_dir/app/config/$LARAVEL_ENV/log.php
  # link shared app/storage directory
  rm -rf $target_dir/app/storage
  ln -s $SITE_ROOT/storage $target_dir/app
  # populate application database
  cd $target_dir
  php artisan migrate --env=$LARAVEL_ENV
  # activate site
  rm -rf $SITE_ROOT/w
  ln -s $target_dir $SITE_ROOT/w
}