nut-debian/debian/nut-client.postinst

#!/bin/sh -e

handle_start_failure () {
# The nut client part (upsmon) must run in all cases except when MODE in
# /etc/nut/nut.conf is set to "none" or not set at all.
  [ -r /etc/nut/nut.conf ] && . /etc/nut/nut.conf
  if [ -d /run/systemd/system ] && [ "$MODE" = "none" -o -z "$MODE" ]; then
    return 0
  else
    return 1
  fi
}

case "$1" in

  configure)

    # make sure the nut user exists and has correct memberships
    if ! getent group nut >/dev/null; then
      addgroup --quiet --system nut
    fi
    if ! getent passwd nut >/dev/null; then
      adduser --quiet --system --ingroup nut --home /var/lib/nut --no-create-home nut
    elif ! groups nut | grep -qw nut; then
      adduser nut nut
    fi
# for Ubuntu, while waiting for a proper debconf
#    if ! groups nut | grep -qw dialout; then
#	adduser nut dialout
#    fi

    # make sure that conffiles are secured and have the correct ownerships
    # on first install
    if [ -z "$2" ] ; then
        if [ -d /etc/nut/ ] ; then
          chown root:nut /etc/nut/
        fi
        for file in nut.conf upsmon.conf upssched.conf ; do
            if [ -f /etc/nut/$file ] ; then
                chown root:nut /etc/nut/$file
                chmod 640 /etc/nut/$file
            fi
        done
    fi

    # make sure that /run/nut exists and has the correct ownerships
    if [ ! -d /run/nut ] ; then
        mkdir -p /run/nut
    fi
    if [ -d /run/nut ] ; then
        chown root:nut /run/nut
        chmod 770 /run/nut
        if which restorecon >/dev/null 2>&1; then
	    restorecon /run/nut
        fi
    fi
    ;;

  abort-upgrade|abort-remove|abort-deconfigure)
    # do nothing
    ;;

  *)
    echo "$0: incorrect arguments: $*" >&2
    exit 1
    ;;

esac

#DEBHELPER#

exit 0