postinst is in nut-client 2.7.4-5.1ubuntu2.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 | #!/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 /var/run/nut exists and has the correct ownerships
    if [ ! -d /var/run/nut ] ; then
        mkdir -p /var/run/nut
    fi
    if [ -d /var/run/nut ] ; then
        chown root:nut /var/run/nut
        chmod 770 /var/run/nut
        if which restorecon >/dev/null 2>&1; then
	    restorecon /var/run/nut
        fi
    fi
    if dpkg --compare-versions "$2" le "2.6.4-2~" &&
      [ -f /etc/init.d/nut ] ; then
        if [ "`md5sum /etc/init.d/nut | cut -d ' ' -f 1`" = 72f1dbc6b92cb4407f26605d05b12681 ]; then
            rm -f /etc/init.d/nut
        else
            mv /etc/init.d/nut /etc/init.d/nut.dpkg-old
        fi
        update-rc.d nut remove >/dev/null
    fi
    ;;
  abort-upgrade)
    # do nothing
    ;;
  abort-remove)
    # do nothing
    ;;
  abort-deconfigure)
    # do nothing
    ;;
  *)
    echo "$0: incorrect arguments: $*" >&2
    exit 1
    ;;
esac
# Automatically added by dh_systemd_enable/10.10.7ubuntu2
# This will only remove masks created by d-s-h on package removal.
deb-systemd-helper unmask 'nut-monitor.service' >/dev/null || true
# was-enabled defaults to true, so new installations run enable.
if deb-systemd-helper --quiet was-enabled 'nut-monitor.service'; then
	# Enables the unit on first installation, creates new
	# symlinks on upgrades if the unit file has changed.
	deb-systemd-helper enable 'nut-monitor.service' >/dev/null || true
else
	# Update the statefile to add new symlinks (if any), which need to be
	# cleaned up on purge. Also remove old symlinks.
	deb-systemd-helper update-state 'nut-monitor.service' >/dev/null || true
fi
# End automatically added section
# Automatically added by dh_installinit/10.10.7ubuntu2
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ]; then
	# In case this system is running systemd, we need to ensure that all
	# necessary tmpfiles (if any) are created before starting.
	if [ -d /run/systemd/system ] ; then
		systemd-tmpfiles --create /usr/lib/tmpfiles.d/nut-client.conf >/dev/null || true
	fi
fi
# End automatically added section
# Automatically added by dh_installinit/10.10.7ubuntu2
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ]; then
	if [ -x "/etc/init.d/nut-client" ]; then
		update-rc.d nut-client defaults >/dev/null
		if [ -n "$2" ]; then
			_dh_action=restart
		else
			_dh_action=start
		fi
		invoke-rc.d nut-client $_dh_action || handle_start_failure
	fi
fi
# End automatically added section
# Automatically added by dh_installdeb/10.10.7ubuntu2
dpkg-maintscript-helper rm_conffile /etc/bash_completion.d/nut 2.7.1-1~ -- "$@"
# End automatically added section
exit 0
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