#! /bin/bash

#
# This is a hook script for the yupdate tool, it is automatically executed
# after running "rake install" command.
#
# The script does several tasks:
# - it restarts the DBus service when any file in the d-installer ruby gem
#   was updated
# - saves the installed NPM packages to a cache so they can be reused in the
#   next yupdate run
#

# restart the D-Installer service if needed
function restart_service() {
  # get the service start time
  SERVICE_START=$(systemctl show d-installer | grep "^ExecMainStartTimestamp=" | sed -e "s/^ExecMainStartTimestamp=\(.*\)\$/\\1/")

  if [ -n "$SERVICE_START" ]; then
    SERVICE_START_UNIX_TIME=$(date -d "$SERVICE_START" +"%s")
    # find the date of the latest file in the d-installer gem
    # the regexp is used to ignore the d-installer-cli files
    NEWEST_FILE_TIME=$(find /usr/lib*/ruby/gems/*/gems -type f -regex '\(.*/\)?d-installer-[0-9].*\(/.*\)?' -exec stat --format '%Y' "{}" \; | sort -nr | head -n 1)

    # when a file is newer than the start time then restart the service
    if [ -n "$NEWEST_FILE_TIME" ] && [ "$SERVICE_START_UNIX_TIME" -lt "$NEWEST_FILE_TIME" ]; then
      echo "Restarting D-Installer service..."
      systemctl restart d-installer
    fi
  fi
}

# copy installed NPM packages to cache
function save_npm_cache() {
  echo "Saving NPM cache..."
  CACHEDIR="$HOME/.cache/d-installer-devel/"
  mkdir -p "$CACHEDIR"

  MYDIR=$(realpath "$(dirname "$0")")
  cp -aR "$MYDIR/web/node_modules" "$CACHEDIR"
}

restart_service

# cache the installed NPM packages
if [ "$NPM_CACHE" = "1" ] ; then
  save_npm_cache
fi