#!/bin/sh

set -e

. /usr/share/debconf/confmodule

THIS_PACKAGE=sddm
DEFAULT_DISPLAY_MANAGER_FILE=/etc/X11/default-display-manager

# creating sddm group if he isn't already there
if ! getent group sddm >/dev/null; then
    addgroup --system sddm
fi

# creating sddm user if he isn't already there
if ! getent passwd sddm >/dev/null; then
    adduser --system --ingroup sddm --home /var/lib/sddm sddm
    usermod -c "Simple Desktop Display Manager" sddm
    usermod -d "/var/lib/sddm"                  sddm
    usermod -g "sddm"                           sddm
    usermod -s "/bin/false"                     sddm
fi

if [ ! -e /var/lib/sddm ]; then
    # If sddm was purged while running, the home dir gets removed but the user
    # remains (as deluser refuses to delete a user that's in use).
    mkdir -p /var/lib/sddm
fi

if [ -d /var/lib/sddm ]; then
    # There has been a -R in version prior to 0.19
    # but this opens up symlink attacks. Remove it.
    chown sddm:sddm /var/lib/sddm
    chmod 0750 /var/lib/sddm
fi

# debconf is not a registry, so we only fiddle with the default file if it
# does not exist
if ! [ -e "$DEFAULT_DISPLAY_MANAGER_FILE" ]; then
    if db_get shared/default-x-display-manager; then
        if [ -z "$RET" ]; then
            RET="$THIS_PACKAGE"
        fi
        if [ "$THIS_PACKAGE" != "$RET" ]; then
            echo "Please be sure to run \"dpkg --configure $RET\"."
        fi
        if db_get "$RET"/daemon_name; then
            echo "$RET" > "$DEFAULT_DISPLAY_MANAGER_FILE"
        fi
    fi
fi

# remove the displaced old default display manager file if it exists
if [ -e "$DEFAULT_DISPLAY_MANAGER_FILE.dpkg-tmp" ]; then
    rm "$DEFAULT_DISPLAY_MANAGER_FILE.dpkg-tmp"
fi

# debconf hangs if sddm gets started below without this
db_stop || true

if [ "$1" = "configure" ]; then
    invoke-rc.d dbus reload || true
fi

DEFAULT_SERVICE=/etc/systemd/system/display-manager.service
# set default-display-manager systemd service link according to our config
if [ "$1" = configure ] && [ -d /etc/systemd/system/ ]; then
    if [ -e "$DEFAULT_DISPLAY_MANAGER_FILE" ]; then
        SERVICE=/lib/systemd/system/$(basename $(cat "$DEFAULT_DISPLAY_MANAGER_FILE")).service
        if [ -h "$DEFAULT_SERVICE" ] && [ $(readlink "$DEFAULT_SERVICE") = /dev/null ]; then
            echo "Display manager service is masked" >&2
        elif [ -e "$SERVICE" ]; then
            ln -sf "$SERVICE" "$DEFAULT_SERVICE"
        else
            echo "ERROR: $SERVICE is the selected default display manager but does not exist" >&2
        fi
    fi
fi


if [ -x /etc/init.d/sddm ]; then
    update-rc.d sddm defaults >/dev/null 2>&1
fi

touch /var/log/sddm.log
chown sddm:sddm /var/log/sddm.log

#DEBHELPER#

exit 0