x2goserver-xsession 4.1.0.0-3 / etc / x2go / Xsession

#!/bin/bash
#
# /etc/x2go/Xsession
#
# X2Go Xsession file -- used by x2goserver Xsession.d add-on.

# This file has been derived from the global Xsession file in Debian squeeze

set -e

X2GO_LIBEXEC_PATH="$(x2gopath libexec)";

PROGNAME=XSession-x2go

message () {
	# pretty-print messages of arbitrary length; use xmessage if it
	# is available and $DISPLAY is set
	MESSAGE="$PROGNAME: $*"
	echo "$MESSAGE" | fold -s -w ${COLUMNS:-80} >&2
	if [ -n "$DISPLAY" ] && which xmessage 1> /dev/null 2>&1; then
		echo "$MESSAGE" | fold -s -w ${COLUMNS:-80} | xmessage -center -file -
	fi
}

message_nonl () {
	# pretty-print messages of arbitrary length (no trailing newline); use
	# xmessage if it is available and $DISPLAY is set
	MESSAGE="$PROGNAME: $*"
	printf '%s' "$MESSAGE" | fold -s -w ${COLUMNS:-80} >&2;
	if [ -n "$DISPLAY" ] && which xmessage 1> /dev/null 2>&1; then
		printf '%s' "$MESSAGE" | fold -s -w ${COLUMNS:-80} | xmessage -center -file -
	fi
}

errormsg () {
	# exit script with error
	message "$*"
	exit 1
}

internal_errormsg () {
	# exit script with error; essentially a "THIS SHOULD NEVER HAPPEN" message
	# One big call to message() for the sake of xmessage; if we had two then
	# the user would have dismissed the error we want reported before seeing the
	# request to report it.
	errormsg "$*" \
	   "Please report the installed version of the \"X2Go Server\"" \
	   "package and the complete text of this error message to" \
	   "<x2go-dev@lists.x2go.org>."
}

# Load profile
for file in "/etc/profile" "$HOME/.profile" "/etc/xprofile" "$HOME/.xprofile"; do
	if [ -f "$file" ]; then
		echo "Loading profile from $file";
		set +e
		. "$file"
		set -e
	fi
done

cur_hostname="$(hostname)"
if [ -z "${cur_hostname}" ] || [ "${cur_hostname}" = "(none)" ] || [ "${cur_hostname}" = "localhost" ]; then
	errormsg "Hostname not set correctly; aborting."
fi

# initialize variables for use by all session scripts

OPTIONFILE=/etc/x2go/Xsession.options

SYSRESOURCES=/etc/x2go/Xresources
USRRESOURCES=$HOME/.Xresources-x2go

SYSSESSIONDIR=/etc/x2go/Xsession.d
USERXSESSION=$HOME/.xsession-x2go
USERXSESSIONRC=$HOME/.xsessionrc-x2go
ALTUSERXSESSION=$HOME/.Xsession-x2go
ERRFILE="${HOME}/.xsession-x2go-${cur_hostname}-errors"

# Move the old error log file away.
if [ -f "${ERRFILE}" ]; then
	if [ -L "${ERRFILE}" ]; then
		resolved_errfile="$(perl -e 'use Cwd qw (abs_path); print abs_path ("' "${ERRFILE}" '") . "\n";')"
		mv "${resolved_errfile}" "${resolved_errfile}.old" || errormsg "Unable to move symlinked old log/error file '${resolved_errfile}'; aborting."
	else
		mv "${ERRFILE}" "${ERRFILE}.old" || errormsg "Unable to move old log/error file '${ERRFILE}'; aborting."
	fi
fi

# attempt to create an error file; abort if we cannot
if (umask 177 && touch "$ERRFILE") 2> /dev/null && [ -w "$ERRFILE" ] && [ ! -L "$ERRFILE" ]; then
	chmod 600 "$ERRFILE"
elif ERRFILE=$(umask 077 && mktemp 2> /dev/null); then
	if ! ln -sf "$ERRFILE" "${TMPDIR:=/tmp}/xsession-x2go-${cur_hostname}-$USER"; then
		message "warning: unable to symlink \"$TMPDIR/xsession-x2go-${cur_hostname}-$USER\" to" \
		        "\"$ERRFILE\"; look for session log/errors in" \
		        "\"$TMPDIR/xsession-x2go-$USER\"."
	fi
else
	errormsg "unable to create X session (X2Go) log/error file; aborting."
fi

exec >>"$ERRFILE" 2>&1

echo "$PROGNAME: X session started for $LOGNAME at $(date)"


# Attempt to create a file of non-zero length in /tmp; a full filesystem can
# cause mysterious X session failures.  We do not use touch, :, or test -w
# because they won't actually create a file with contents.  We also let standard
# error from mktemp and echo go to the error file to aid the user in
# determining what went wrong.
WRITE_TEST=$(mktemp)
if ! echo "*" >>"$WRITE_TEST"; then
	message "warning: unable to write to ${WRITE_TEST%/*}; X session (X2Go) may" \
	        "exit with an error"
fi
rm -f "$WRITE_TEST"


if [ -f /etc/debian_version ] || [ -f /etc/devuan_version ]; then

	# sanity check; is our session script directory present?
	if [ ! -d "$SYSSESSIONDIR" ]; then
		errormsg "no \"$SYSSESSIONDIR\" directory found; aborting."
	fi

	# use run-parts to source every file in the session directory; we source
	# instead of executing so that the variables and functions defined above
	# are available to the scripts, and so that they can pass variables to each
	# other

	SESSIONFILES=$(run-parts --list $SYSSESSIONDIR)
	SYSSESSIONDIR=/etc/x2go/Xsession.d

	SESSIONFILES=$(run-parts --list $SYSSESSIONDIR)

	### source Xsession files
	if [ -n "$SESSIONFILES" ]; then

		set +e
		for SESSIONFILE in $SESSIONFILES; do
			"$X2GO_LIBEXEC_PATH/x2gosyslog" "$0" "info" "executing $SESSIONFILE"
			. $SESSIONFILE
		done
		set -e
	fi
elif [ -f /etc/redhat-release ] || [ -f /etc/gentoo-release ] || [ -f /etc/SUSE-brand ] || [ -f /etc/SuSE-release ] || [ -f /etc/os-rt-release ]; then

	# define a fallback... (should never be needed). The XSESSION_EXEC var gets set in
	# X2Go's x2goruncommand script and can be used with obsolete switchdesk or with
	# Xclients.d scripts (also rarely used, see below...).
	XSESSION_EXEC=${XSESSION_EXEC:-xterm}

	# Set up i18n environment
	if [ -r /etc/profile.d/lang.sh ]; then
		set +e
		. /etc/profile.d/lang.sh
		set -e
	fi

	# merge in defaults
	[ -r "$SYSRESOURCES" ] && xrdb -nocpp -merge "$SYSRESOURCES"
	[ -r "$USRRESOURCES" ] && xrdb -merge "$USRRESOURCES"

	# RHEL's Xsession file for X11 allows playing with setxkbmap / xmodmap
	# We provide this for compat, but disrecommend using it. Make sure to
	# disable any Keyboard setup in X2Go Client / PyHoca-GUI if you want to
	# use server-side key mappings.
	USRMODMAP=$HOME/.Xmodmap-x2go
	USRXKBMAP=$HOME/.Xkbmap-x2go

	SYSMODMAP=/etc/x2go/Xmodmap
	SYSXKBMAP=/etc/x2go/Xkbmap

	# merge in keymaps
	if [ -r "$SYSXKBMAP" ]; then
		setxkbmap $(cat "$SYSXKBMAP")
		XKB_IN_USE=yes
	fi

	if [ -r "$USRXKBMAP" ]; then
		setxkbmap $(cat "$USRXKBMAP")
		XKB_IN_USE=yes
	fi

	# xkb and xmodmap don't play nice together
	if [ -z "$XKB_IN_USE" ]; then
		[ -r "$SYSMODMAP" ] && xmodmap "$SYSMODMAP"
		[ -r "$USRMODMAP" ] && xmodmap "$USRMODMAP"
	fi

	unset XKB_IN_USE

	# run all system xinitrc shell scripts.
	for file in /etc/x2go/xinitrc.d/* ; do
		set +e
		[ -r "$file" ] && . $file
		set -e
	done

	# Prefix launch of session with ssh-agent if available and not already running.
	SSH_AGENT=
	if [ -x /usr/bin/ssh-agent -a -z "$SSH_AGENT_PID" ]; then
		if [ "x$TMPDIR" != "x" ]; then
			SSH_AGENT="/usr/bin/ssh-agent /bin/env TMPDIR=$TMPDIR"
		else
			SSH_AGENT="/usr/bin/ssh-agent"
		fi
	fi

	CK_XINIT_SESSION=
	if [ -x /usr/bin/ck-xinit-session -a -z "$XDG_SESSION_COOKIE" ]; then
		CK_XINIT_SESSION="/usr/bin/ck-xinit-session"
	fi

	# At the time of integrating X2Go Xsession support for RHEL6 / Fedora
	# the Xsession stuff in Fedora/RHEL6 seems to be a little mess.
	# The proposed strategy is to have Xclients.$WM.sh files in 
	# /etc/X11/xinit/Xclients.d. Currently, only wmx uses this mechanism.
	# As it is a described but rather unused ,,standard'' we will not support it
	# in X2Go for now, but leave it here as a reminder...

	# XCLIENTS_D=/etc/x2go/Xclients.d
	#if [ -d "$XCLIENTS_D" -a -x "$XCLIENTS_D/Xclients.${XSESSION_EXEC}.sh" ]; then
	#	exec /bin/bash -c "exec -l \"$SHELL\" -c \"$CK_XINIT_SESSION $SSH_AGENT $XCLIENTS_D/Xclients.$1.sh\""
	#fi

	# switchdesk support is also totally deprecated in RHEL, but we leave it here
	# as a reminder, as well, in case we need it in the future for special setups...
	#if [ -x "$SWITCHDESKPATH/Xclients.${XSESSION_EXEC}" ]; then
	#	exec /bin/bash -c "exec -l \"$SHELL\" -c \"$SWITCHDESKPATH/Xclients.${XSESSION_EXEC}\""
	#fi

	exec $CK_XINIT_SESSION $SSH_AGENT /bin/bash -c "exec -l \"$SHELL\" -c \"$STARTUP\""
else
	errormsg 'Unknown operating system, XSession startup not implemented!'
fi

exit 0