Xsession

#! /bin/sh
# Xsession - run as user
# Copyright (C) 2016 Pier Luigi Fiorini <pierluigi.fiorini@gmail.com>

# This file is extracted from kde-workspace (kdm/kfrontend/genkdmconf.c)
# Copyright (C) 2001-2005 Oswald Buddenhagen <ossi@kde.org>

# Note that the respective logout scripts are not sourced.
case $SHELL in
  */bash)
    [ -z "$BASH" ] && exec $SHELL --login $0 "$@"
    shopt -q login_shell || exec $SHELL --login $0 "$@"
    set +o posix
    ;;
  */zsh)
    [ -z "$ZSH_NAME" ] && exec $SHELL --login $0 "$@"
    [[ -o login ]] || exec $SHELL --login $0 "$@"
    emulate -R sh
    ;;
  */csh|*/tcsh)
    # [t]cshrc is always sourced automatically.
    # Note that sourcing csh.login after .cshrc is non-standard.
    xsess_tmp=`mktemp /tmp/xsess-env-XXXXXX`
    $SHELL -c "if (-f /etc/csh.login) source /etc/csh.login; if (-f ~/.login) source ~/.login; /bin/sh -c 'export -p' >! $xsess_tmp"
    . $xsess_tmp
    rm -f $xsess_tmp
    ;;
  */fish)
    [ -f /etc/profile ] && . /etc/profile
    [ -f $HOME/.profile ] && . $HOME/.profile
    xsess_tmp=`mktemp /tmp/xsess-env-XXXXXX`
    $SHELL --login -c "/bin/sh -c 'export -p' > $xsess_tmp"
    . $xsess_tmp
    rm -f $xsess_tmp
    ;;
  *) # Plain sh, ksh, and anything we do not know.
    [ -f /etc/profile ] && . /etc/profile
    [ -f $HOME/.profile ] && . $HOME/.profile
    ;;
esac

[ -f /etc/xprofile ] && . /etc/xprofile
[ -f /usr/local/etc/xprofile ] && . /usr/local/etc/xprofile
[ -f $HOME/.xprofile ] && . $HOME/.xprofile

# run all system xinitrc shell scripts.
if [ -d /etc/X11/xinit/xinitrc.d ]; then
  for i in /etc/X11/xinit/xinitrc.d/* ; do
  if [ -x "$i" ]; then
    . "$i"
  fi
  done
fi

# Load Xsession scripts
# OPTIONFILE, USERXSESSION, USERXSESSIONRC and ALTUSERXSESSION are required
# by the scripts to work
xsessionddir="/etc/X11/Xsession.d"
OPTIONFILE=/etc/X11/Xsession.options
USERXSESSION=$HOME/.xsession
USERXSESSIONRC=$HOME/.xsessionrc
ALTUSERXSESSION=$HOME/.Xsession

if [ -d "$xsessionddir" ]; then
    for i in `ls $xsessionddir`; do
        script="$xsessionddir/$i"
        echo "Loading X session script $script"
        if [ -r "$script"  -a -f "$script" ] && expr "$i" : '^[[:alnum:]_-]\{1,\}$' > /dev/null; then
            . "$script"
        fi
    done
fi

if [ -d /etc/X11/Xresources ]; then
  for i in /etc/X11/Xresources/*; do
    [ -f $i ] && xrdb -merge $i
  done
elif [ -f /etc/X11/Xresources ]; then
  xrdb -merge /etc/X11/Xresources
fi
[ -f $HOME/.Xresources ] && xrdb -merge $HOME/.Xresources

if [ -f "$USERXSESSIONRC" ]; then
  . "$USERXSESSIONRC"
fi
if [ -f "$USERXSESSION" ]; then
  . "$USERXSESSION"
fi

if [ -z "$*" ]; then
    exec xmessage -center -buttons OK:0 -default OK "Sorry, $DESKTOP_SESSION is no valid session."
else
    exec $@
fi