###################################################################
#
#       This script is a part of the pam_script_ses_open script
#       and is not stand-alone!
#
#       It will try to mount the home directories of students
#       under /home/<user>/PERSISTENT using kerberos.
#


# Only consider users not in local user db
if ! grep -q "^${PAM_USER}:" /etc/passwd; then

	if [ -z "$PAM_USER" ]; then
		#  Ask for username
		read -p "Benutzername: " loggedInUser
	else
		loggedInUser="$PAM_USER"
	fi

	if [ -n "$PAM_AUTHTOK" ]; then
		password="$PAM_AUTHTOK"
	else
		# No password from pam stack, ask user (if we're on a console)
		if [ "x$PAM_TTY" = "xssh" ]; then
			read -p "Passwort: " password
		elif [ "x$(echo "$PAM_TTY" | cut -c 1-8)" = "x/dev/tty" ]; then
			read -p "Passwort: " password
		fi
	fi

	if [ -n "$password" ]; then
		# We know the user's password, so try to mount H-Drive
		SIGNAL=$(mktemp)
		ERRLOG=$(mktemp)
		rm -f -- "${SIGNAL}"
		( ncpmount -A "fs1-2-home.rz.hs-offenburg.de" -S "fs1-2-home.rz.hs-offenburg.de" -V "HOME/USERS/$loggedInUser" -U "$loggedInUser.HRZ.FHO" -P "$password" "$PERSISTENT_HOME_DIR" > "$ERRLOG" 2>&1 || touch "$SIGNAL" ) &
		MOUNT_PID=$!
		for COUNTER in 1 1 2 3; do
			kill -0 "$MOUNT_PID" || break
			sleep "$COUNTER"
		done
		if [ -e "${SIGNAL}" ]; then # Signal file was created, so mount failed
			slxlog "pam-offenburg" "Mount of 'HOME/USERS/$loggedInUser' to '$PERSISTENT_HOME_DIR' failed." "$ERRLOG"
		elif kill -9 "${MOUNT_PID}" 2>/dev/null; then # ncpmount is still running, consider it failed and kill it
			slxlog "pam-offenburg" "Mount of 'HOME/USERS/$loggedInUser' to '$PERSISTENT_HOME_DIR' timed out." "$ERRLOG"
		else # mounting worked
			chmod 777 "$PERSISTENT_HOME_DIR"
			PERSISTENT_OK=yes
		fi
		rm -f -- "$SIGNAL"
		rm -f -- "$ERRLOG"
	fi
fi