[pkg-fso-maint] Bug#538797: nodm: breaks when NODM_X_OPTIONS includes a display number or vtN

[Vagrant Cascadian]

Package: nodm
Version: 0.5-1
Severity: normal

if NODM_X_OPTIONS includes vtN or a display, nodm still passes both to the
xinit commandline. it should probably parse NODM_X_OPTIONS and only add missing
entries.

for example:

  NODM_X_OPTIONS=":7 vt7 -br"

nodm ends up running:

  /usr/bin/xinit /usr/sbin/nodm -- vt9 :7 vt7 -br 

and X runs like so:

  X :0 vt9 :7 vt7 -br

X leaves a log in /var/log/Xorg.7.log, so it appears to think it's running on
display :7. but the session simply doesn't come up- maybe the session thinks
DISPLAY=:0.

the xinit manpage suggests that the display must be the first option passed
after -- (unless you explicitly specify an X server):

       xinit [ [ client ] options ... ] [ -- [ server ] [ display ] options ... ]

live wll,
  vagrant