#!/bin/bash
# postinst script for core-agent-linux
#
# see: dh_installdeb(1)

set -e

# The postinst script may be called in the following ways:
#   * <postinst> 'configure' <most-recently-configured-version>
#   * <old-postinst> 'abort-upgrade' <new version>
#   * <conflictor's-postinst> 'abort-remove' 'in-favour' <package>
#     <new-version>
#   * <postinst> 'abort-remove'
#   * <deconfigured's-postinst> 'abort-deconfigure' 'in-favour'
#     <failed-install-package> <version> 'removing'
#     <conflicting-package> <version>
#
#    For details, see http://www.debian.org/doc/debian-policy/ or
# https://www.debian.org/doc/debian-policy/ch-maintainerscripts.html or
# the debian-policy package


debug() {
    if [ "${DEBDEBUG}" == "1" ]; then
        echo -e "$@"
    fi
}

is_static() {
    [ -f "/lib/sytemd/system/$1" ] && ! grep -q '^[[].nstall]' "/lib/systemd/system/$1"
}

is_masked() {
    if [ ! -L /etc/systemd/system/"$1" ]
    then
       return 1
    fi
    target=$(readlink /etc/systemd/system/"$1" 2>/dev/null || :)
    if [ "$target" = "/dev/null" ]
    then
       return 0
    fi
    return 1
}

mask() {
    ln -sf /dev/null /etc/systemd/system/"$1"
}

unmask() {
    if ! is_masked "$1"
    then
        return 0
    fi
    rm -f /etc/systemd/system/"$1"
}

preset_units() {
    local represet=
    while read -r action unit_name
    do
        if [ "$action" = "#" ] && [ "$unit_name" = "Units below this line will be re-preset on package upgrade" ]
        then
            represet=1
            continue
        fi
        echo "$action $unit_name" | grep -q '^[[:space:]]*[^#;]' || continue
        if ! [ -n "$action" ] || ! [ -n "$unit_name" ]; then
            continue
        fi
        if [ "$2" = "initial" ] || [ "$represet" = "1" ]
        then
            if [ "$action" = "disable" ] && is_static "$unit_name"
            then
                if ! is_masked "$unit_name"
                then
                    # We must effectively mask these units, even if they are static.
                    deb-systemd-helper mask "${unit_name}" > /dev/null 2>&1 || true
                fi
            elif [ "$action" = "enable" ] && is_static "$unit_name"
            then
                if is_masked "$unit_name"
                then
                    # We masked this static unit before, now we unmask it.
                    deb-systemd-helper unmask "${unit_name}" > /dev/null 2>&1 || true
                fi
                systemctl --no-reload preset "$unit_name" >/dev/null 2>&1 || :
            else
                systemctl --no-reload preset "$unit_name" >/dev/null 2>&1 || :
            fi
        fi
    done < "$1"

    systemctl daemon-reload
}

installSerialConf() {
    debug "Installing over-ridden serial.conf init script..."
    if [ -e /etc/init/serial.conf ]; then
        cp /usr/share/qubes/serial.conf /etc/init/serial.conf
    fi
}

case "${1}" in
    configure)
        # Initial installation of package only
        # ($2 contains version number on update; nothing on initial installation)
        if [ -z "${2}" ]; then

            debug "FIRST INSTALL..."
            # Location of files which contains list of protected files
            # shellcheck source=init/functions
            . /usr/lib/qubes/init/functions

            # ensure that hostname resolves to 127.0.1.1 resp. ::1 and that /etc/hosts is
            # in the form expected by qubes-sysinit.sh
            if ! is_protected_file /etc/hostname ; then
                for ip in '127\.0\.1\.1' '::1'; do
                    if grep -q "^${ip}\(\s\|$\)" /etc/hosts; then
                        sed -i "/^${ip}\s/,+0s/\(\s$(hostname)\)\+\(\s\|$\)/\2/g" /etc/hosts || true
                        sed -i "s/^${ip}\(\s\|$\).*$/\0 $(hostname)/" /etc/hosts || true
                    else
                        echo "${ip//\\/} $(hostname)" >> /etc/hosts || true
                    fi
                done
            fi

            # remove hostname from 127.0.0.1 line (in debian the hostname is by default
            # resolved to 127.0.1.1)
            if ! is_protected_file /etc/hosts ; then
                sed -i "/^127\.0\.0\.1\s/,+0s/\(\s$(hostname)\)\+\(\s\|$\)/\2/g" /etc/hosts || true
            fi

            # Set default "runlevel"
            rm -f /etc/systemd/system/default.target
            ln -s /lib/systemd/system/multi-user.target /etc/systemd/system/default.target

            # Systemd preload-all
            preset_units /lib/systemd/system-preset/75-qubes-vm.preset initial

            # Maybe install overridden serial.conf init script
            installSerialConf
        else
            preset_units /lib/systemd/system-preset/75-qubes-vm.preset upgrade
        fi
        systemctl reenable haveged

        debug "UPDATE..."
        # disable some Upstart services
        for init in plymouth-shutdown \
                    prefdm \
                    splash-manager \
                    start-ttys \
                    tty ; do
            dpkg-divert --divert /etc/init/${init}.conf.qubes-disabled --package qubes-core-agent --rename --add /etc/init/${init}.conf
        done
        dpkg-divert --divert /etc/init/serial.conf.qubes-orig --package qubes-core-agent --rename --add /etc/init/serial.conf

        if [ ! -L /etc/systemd/system/rpcbind.service ]; then
            ln -s /dev/null /etc/systemd/system/rpcbind.service
        fi

        # Remove old firmware updates link
        if [ -L /lib/firmware/updates ]; then
            rm -f /lib/firmware/updates
        fi

        # remove old symlinks
        if [ -L /etc/systemd/system/sysinit.target.wants/qubes-random-seed.service ]; then
            rm /etc/systemd/system/sysinit.target.wants/qubes-random-seed.service
        fi
        if [ -L /etc/systemd/system/multi-user.target.wants/qubes-mount-home.service ]; then
            rm /etc/systemd/system/multi-user.target.wants/qubes-mount-home.service
        fi

        if ! dpkg-statoverride --list /var/lib/qubes/dom0-updates >/dev/null 2>&1; then
            dpkg-statoverride --update --add user user 775 /var/lib/qubes/dom0-updates
        fi

        glib-compile-schemas /usr/share/glib-2.0/schemas || true


        # Update Qubes App Menus
        /usr/lib/qubes/qubes-trigger-sync-appmenus.sh || true
        ;;

    abort-upgrade|abort-remove|abort-deconfigure)
        exit 0
        ;;

    triggered)
        for trigger in ${2}; do
            case "${trigger}" in

                /usr/share/applications)
                    debug "Updating Qubes App Menus..."
                    /usr/lib/qubes/qubes-trigger-sync-appmenus.sh || true
                    ;;

                # Install overridden serial.conf init script
                /etc/init/serial.conf)
                    installSerialConf
                    ;;

            esac
        done
        exit 0
        ;;

    *)
        echo "postinst called with unknown argument \`${1}'" >&2
        exit 1
        ;;
esac

# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.

#DEBHELPER#

exit 0

# vim: set ts=4 sw=4 sts=4 et :