_bc_user=flowee
_bc_group=flowee

post_install() {
  _mkuser
  _dir="/var/lib/flowee"
  _log="/var/log/flowee"
  _cnf="/etc/flowee"
  if test ! -d "$_dir"; then
    mkdir -m 750 "$_dir"
    # disable Copy-On-Write (btrfs directories only)
    # This avoids lots of known db-corruption issues
    _is_btrfs "$_dir" && chattr +C "$_dir"
  fi
  mkdir -p -m 770 "$_log"
  chown -R $_bc_user:$_bc_group "$_dir" "$_cnf" "$_log"
}

post_upgrade() {
  _mkuser
}


# ------------------------------------------------------------------------------
# helper functions for creating flowee user / group
# ------------------------------------------------------------------------------

_mkuser() {
  getent passwd $_bc_user &>/dev/null || {
    echo -n "Creating flowee user... "
    grep -E "^$_bc_group:" /etc/group >/dev/null || groupadd $_bc_group
    useradd -m -d /etc/flowee -g $_bc_group -s /usr/bin/nologin $_bc_user 2>/dev/null
    echo "done"
  }
}

# ------------------------------------------------------------------------------
# helper functions for disabling btrfs Copy-On-Write (CoW)
# https://wiki.archlinux.org/index.php/Btrfs#Copy-On-Write_.28CoW.29
# ------------------------------------------------------------------------------

# check if dir is btrfs
_is_btrfs() {
  if [[ $(findmnt --target $1 --output FSTYPE --noheadings) == 'btrfs' ]]; then
    return 0
  else
    return 1
  fi
}