#!/usr/bin/env bash
#
# Hook for updating local configuration on each pull. This will automatically put files in their
# right places, but will not enable or start any services automatically; this is left to the user.
#
# Move this to '.git/hooks/post-merge' to have to run automatically after every 'git pull' operation.
# The script assumes write access to host directories, and a CoreOS host. Don't run on other systems!

set -euo pipefail

# Base configuration variables.
ROOTDIR="$(dirname "$(git rev-parse --git-dir)")"
COREOS_CONFIG_DIR="/etc/coreos-home-server"
SYSTEMD_CONFIG_DIR="/etc/systemd/system"

function sync-coreos() {
      local from="${ROOTDIR}/config" to="${COREOS_CONFIG_DIR}"
      rsync --recursive --update --links --times --perms --delete-after --delete-excluded \
            --exclude=.git --exclude=*.fcc --exclude=*.ign --filter='protect *.env' "${from}"/*/ "${to}/"
}

function sync-systemd() {
      local from="${ROOTDIR}/config" to="${SYSTEMD_CONFIG_DIR}"
      rsync --info=name --recursive --update "${from}"/*/systemd/ "${from}"/*/*/systemd/ "${to}/"
}

function main() {
      local buffer

      # Synchronize local configuration into host directory.
      echo "Synchronizing host configuration in '${COREOS_CONFIG_DIR}'..."
      sync-coreos

      echo "Synchronizing systemd configuration in '${SYSTEMD_CONFIG_DIR}'..."
      buffer=$(sync-systemd)

      if test -n "${buffer}"; then
            echo "Systemd services updated, reloading daemon..."
            echo "${buffer}"
            sudo systemctl daemon-reload
      fi
}

# Execute program body.
main "$@"