postinst is in icinga2-common 2.4.1-2ubuntu1.
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 | #!/bin/sh
# postinst script for icinga2-common
set -e
setperm() {
    user="$1"
    group="$2"
    mode="$3"
    file="$4"
    shift 4
    # only do something when no setting exists
    if ! dpkg-statoverride --list "$file" >/dev/null 2>&1; then
      chown "$user":"$group" "$file"
      chmod "$mode" "$file"
    fi
}
is_fresh_install()
{
    if [ -z "$2" ] ; then
        return 0
    fi
    return 1
}
dpkg-maintscript-helper rm_conffile \
   "/etc/bash_completion.d/icinga2" "2.4.1-2~" -- "$@"
case "$1" in
    configure)
        if ! getent passwd nagios > /dev/null ; then
            echo 'Adding system-user for nagios' 1>&2
            adduser --system --group --home /var/lib/nagios \
                    --disabled-login --force-badname nagios > /dev/null
        fi
        # explicitly set permissions on some files that are dependent
        # on the uid/gid of the nagios user, which is dynamically created.
        setperm nagios nagios 0750 /etc/icinga2
        setperm nagios adm 2751 /var/log/icinga2
        setperm nagios adm 2751 /var/log/icinga2/compat
        setperm nagios adm 2755 /var/log/icinga2/compat/archives
        setperm nagios adm 2751 /var/log/icinga2/crash
        setperm nagios nagios 0750 /var/lib/icinga2
        setperm nagios nagios 0750 /var/lib/icinga2/api
        setperm nagios nagios 0750 /var/lib/icinga2/api/log
        setperm nagios nagios 0750 /var/lib/icinga2/api/repository
        setperm nagios nagios 0750 /var/lib/icinga2/api/zones
        setperm nagios www-data 0750 /var/cache/icinga2
        setperm nagios nagios 0750 /var/spool/icinga2
        setperm nagios nagios 0770 /var/spool/icinga2/perfdata
        setperm nagios nagios 0750 /var/spool/icinga2/tmp
    ;;
    abort-upgrade|abort-remove|abort-deconfigure)
    ;;
    *)
        echo "postinst called with unknown argument \`$1'" >&2
        exit 1
    ;;
esac
init_failed ()
{
    echo "Icinga 2 was unable to start due to configuration errors.";
    echo "Please fix them and manually restart the icinga2 daemon using";
    echo " ´service icinga2 start´";
}
# Automatically added by dh_systemd_enable
# This will only remove masks created by d-s-h on package removal.
deb-systemd-helper unmask icinga2.service >/dev/null || true
# was-enabled defaults to true, so new installations run enable.
if deb-systemd-helper --quiet was-enabled icinga2.service; then
	# Enables the unit on first installation, creates new
	# symlinks on upgrades if the unit file has changed.
	deb-systemd-helper enable icinga2.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 icinga2.service >/dev/null || true
fi
# End automatically added section
# Automatically added by dh_installinit
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ]; then
	if [ -x "/etc/init.d/icinga2" ]; then
		update-rc.d icinga2 defaults >/dev/null
	fi
	if [ -x "/etc/init.d/icinga2" ] || [ -e "/etc/init/icinga2.conf" ]; then
		invoke-rc.d icinga2 start || exit $?
	fi
fi
# End automatically added section
exit 0
 |