Add option to change screen resolution using an environment variable

Dockerfile

@@ -15,6 +15,7 @@ ENV LC_ALL C.UTF-8
 ENV LANG en_US.UTF-8
 ENV LANGUAGE en_US.UTF-8
 ENV TZ=Europe/Zurich
+ENV SCREEN_RESOLUTION 1024x768
 RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
 
 # Add the octave repo

README.md

@@ -24,6 +24,8 @@ The Octave GUI have to be accessed through a browser in a noVNC windows.
 * `firefox http://localhost:8083`
 * octave is launched, just run some script e.g. my_sombrero.m
 
+Adding the parameter `-e SCREEN_RESOLUTION=<width>x<height>` the screen size displayed is adjusted to the one in the environment variable. By default it is 1024x768.
+
 ### Manual Build
 
 * `docker build -t epflsti/octave-x11-novnc-docker:latest .`

supervisord.conf

@@ -2,7 +2,7 @@
 nodaemon=true
 
 [program:X11]
-command=/usr/bin/Xvfb :0 -screen 0 1024x768x24
+command=/usr/bin/Xvfb :0 -screen 0 %(ENV_SCREEN_RESOLUTION)sx24
 autorestart=true
 
 [program:x11vnc]