#!/bin/sh
#
# This is SORT OF LIKE an X session, but not quite.  You get a command as the
# first argument (it could be multiple words, so run it with "eval").  As a
# special case, the command can be:
#  failsafe - Run an xterm only
#  default - Run the appropriate Xclients startup (see the code below)
#  custom - Run ~/.xsession and if that's not available run 'default'
#
# (Note that other arguments could also follow, but only the command one is
# right now relevant and supported)
#
# The output is ALREADY redirected to .xsession-errors in GDM.  This way
# .xsession-errors actually gets more output such as if the PreSession script
# is failing.  This also prevents DoS attacks if some app in the users session
# can be prodded to dump lots of stuff on the stdout/stderr.  We wish to be
# robust don't we?  In case you wish to use an existing script for other DM's,
# you can just not redirect when GDMSESSION is set.  GDMSESSION will always
# be set from gdm.
#
# Also note that this is not run as a login shell, this is just executed.
# This is why we source the profile files below.
#
# based on:
# $XConsortium: Xsession /main/10 1995/12/18 18:21:28 gildea $

# this will go into the .xsession-errors along with all other echo's
# good for debugging where things went wrong
echo "$0: Beginning session setup..."

# First read /etc/profile and .profile
test -f /etc/profile && . /etc/profile
test -f "$HOME/.profile" && . "$HOME/.profile"
# Second read /etc/xprofile and .xprofile for X specific setup
test -f /etc/xprofile && . /etc/xprofile
test -f "$HOME/.xprofile" && . "$HOME/.xprofile"
# Third read .bash_profile for keychain to work correctly
test -f "$HOME/.bash_profile" && . "$HOME/.bash_profile"

# Translation stuff
if [ -x "/usr/libexec/gdmtranslate" ] ; then
  gdmtranslate="/usr/libexec/gdmtranslate"
else
  gdmtranslate=
fi

# Note that this should only go to zenity dialogs which always expect utf8
gettextfunc () {
  if [ "x$gdmtranslate" != "x" ] ; then
    "$gdmtranslate" --utf8 "$1"
  else
    echo "$1"
  fi
}

zenity=`which zenity 2>/dev/null`

command="$1"

if [ -z "$command" ] ; then
  command=failsafe
fi

if [ x"$command" = xfailsafe ] ; then
  if [ -n "$zenity" ] ; then
    "$zenity" --info --text `gettextfunc "This is the failsafe xterm session.  Windows now have focus only if you have your cursor above them.  To get out of this mode type 'exit' in the window in the upper left corner"`
  else
    echo "$0: Starting the failsafe xterm session."
  fi
  exec xterm -geometry 80x24+0+0
fi

# Note: ~/.xsession-errors is now done in the daemon so that it
# works for ALL sessions (except ones named 'Failsafe')

# clean up after xbanner
freetemp=`which freetemp 2>/dev/null`
if [ -n "$freetemp" ] ; then
	"$freetemp"
fi

userresources="$HOME/.Xresources"
usermodmap="$HOME/.Xmodmap"
userxkbmap="$HOME/.Xkbmap"

sysresources=/etc/X11/Xresources 
sysmodmap=/etc/X11/Xmodmap 
sysxkbmap=/etc/X11/Xkbmap

rh6sysresources=/etc/X11/xinit/Xresources 
rh6sysmodmap=/etc/X11/xinit/Xmodmap 


# merge in defaults
if [ -f "$rh6sysresources" ]; then
    xrdb -merge "$rh6sysresources"
fi

if [ -f "$sysresources" ]; then
    xrdb -merge "$sysresources"
fi

if [ -f "$userresources" ]; then
    xrdb -merge "$userresources"
fi

# merge in keymaps
if [ -f "$sysxkbmap" ]; then
    setxkbmap `cat "$sysxkbmap"`
    XKB_IN_USE=yes
fi

if [ -f "$userxkbmap" ]; then
    setxkbmap `cat "$userxkbmap"`
    XKB_IN_USE=yes
fi

#
# Eeek, this seems like too much magic here
#
if [ -z "$XKB_IN_USE" -a ! -L /etc/X11/X ]; then
    if grep '^exec.*/Xsun' /etc/X11/X > /dev/null 2>&1 && [ -f /etc/X11/XF86Config ]; then
       xkbsymbols=`sed -n -e 's/^[     ]*XkbSymbols[   ]*"\(.*\)".*$/\1/p' /etc/X11/XF86Config`
       if [ -n "$xkbsymbols" ]; then
           setxkbmap -symbols "$xkbsymbols"
           XKB_IN_USE=yes
       fi
    fi
fi

# xkb and xmodmap don't play nice together
if [ -z "$XKB_IN_USE" ]; then
    if [ -f "$rh6sysmodmap" ]; then
       xmodmap "$rh6sysmodmap"
    fi

    if [ -f "$sysmodmap" ]; then
       xmodmap "$sysmodmap"
    fi

    if [ -f "$usermodmap" ]; then
       xmodmap "$usermodmap"
    fi
fi

unset XKB_IN_USE

# Normalize languages, some places/distros screw us up in /etc/profile,
# so in case the user did select a language
if [ -n "$GDM_LANG" ]; then
  LANG="$GDM_LANG"
  export LANG

  if [ -n "$LC_ALL" ]; then
    if [ "$LC_ALL" != "$LANG" ]; then
      LC_ALL="$LANG"
    fi
  else
    unset LC_ALL
  fi

  if [ -n "$LANGUAGE" ]; then
    if [ "$LANGUAGE" != "$LANG" ]; then
      LANGUAGE="$LANG"
    fi
  else
    unset LANGUAGE
  fi

  if [ -n "$LINGUAS" ]; then
    if [ "$LINGUAS" != "$LANG" ]; then
      LINGUAS="$LANG"
    fi
  else
    unset LINGUAS
  fi
fi

# 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

if [ "x$command" = "xcustom" ] ; then
  if [ -x "$HOME/.xsession" ]; then
    command="$HOME/.xsession"
  else
    echo "$0: Cannot find ~/.xsession will try the default session"
    command="default"
  fi
fi

if [ "x$command" = "xdefault" ] ; then
  if [ -x "$HOME/.Xclients" ]; then
    command="$HOME/.Xclients"
  elif [ -x /etc/X11/xinit/Xclients ]; then
    command="/etc/X11/xinit/Xclients"
  elif [ -x /etc/X11/Xclients ]; then
    command="/etc/X11/Xclients"
  else
    echo "$0: Cannot find Xclients"
    # FIXME: kind of an evil failsafe
    command="xsm"
  fi
fi

# add ssh-agent if found
sshagent="`which ssh-agent 2>/dev/null`"
if [ -n "$sshagent" ] && [ -x "$sshagent" ] && [ -z "$SSH_AUTH_SOCK" ]; then
    command="$sshagent -- $command"
elif [ -z "$sshagent" ] ; then
    echo "$0: ssh-agent not found!"
fi

echo "$0: Setup done, will execute: $command"

eval exec $command

echo "$0: Executing $command failed, will run xterm"

if [ -n "$zenity" ] ; then
	"$zenity" --info --text `gettextfunc "I could not start your session and so I have started the failsafe xterm session.  Windows now have focus only if you have your cursor above them.  To get out of this mode type 'exit' in the window in the upper left corner"`
fi

exec xterm -geometry 80x24+0+0