troubles with ltsp-localappsd

i seem to be having issues with the code that runs ltsp-localappsd (from
/usr/share/ldm/rc.d/S01-localapps):

    #Launch the ltsp-localappsd to handle the apps
    (
    echo $! > $LOCALAPPSD_PIDFILE

    # if cups is installed in the chroot, use LDM_SERVER for printing
    [ -d "/etc/cups" ] && echo "ServerName ${LDM_SERVER}" > /etc/cups/client.conf

    ltsp-localappsd

    # Clean up localapps menu
    if boolean_is_true "$LOCAL_APPS_MENU"; then
        [ -x "/usr/bin/ltsp-genmenu" ] && su - ${LDM_USERNAME} -c "/usr/bin/ltsp-genmenu remove"
    fi

    # Clean up cups config
    [ -r "/etc/cups/client.conf" ] && rm -f /etc/cups/client.conf

    # Copy back passwd and group
    for i in passwd group; do
        cp "${LOCALAPPS_CACHE}/${i}" /etc/${i}
    done

    # Unmount sshfs and remove the mount dir
    fusermount -uqz ${LDM_HOME}
    rmdir ${LDM_HOME}
    rm $LOCALAPPSD_PIDFILE
    )&

the LOCALAPPS_PIDFILE doesn't get created without adding:

  mkdir -p $(dirname $LOCALAPPSD_PIDFILE)

and the pid it generates is actually for ldm-script ... so i'm not sure it's
even the right PID anyways.

but the big problem is that all the code after "ltsp-localappsd" as best
i can tell, is never run. i even put an "date >> /tmp/foobar"
immediately after ltsp-localappsd, but it never executes.

i tweaked the code in ltsp-localappsd a little to get more debugging out of it,
and it seems that the call to xatomwait never returns non-zero:

  # Poll for LTSP_COMMAND changes and execute
  while :; do
      LTSP_COMMAND="$(xatomwait LTSP_COMMAND)"
      [ "$?" != 0 ] && exit

i rewrote it also to output something when xatomwait returns non-zero, but it
never happens. but strangely, ltsp-localappsd does in fact exit; the process
stops running. i just can't figure out how, that's the only exit call and it's
in an infinite loop otherwise...

i'm stumped.

live well,
  vagrant

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