Add support for computers without NVIDIA hardware

Dockerfile

@@ -1,7 +1,6 @@
+ARG BASE_IMAGE
 
-ARG UBUNTU_VERSION
-
-FROM nvidia/opengl:1.1-glvnd-runtime-ubuntu${UBUNTU_VERSION}
+FROM ${BASE_IMAGE}
 
 # For this build, we pull the entire ros image, and then merge the filesystem
 # with the nvidia/opengl image, so that displaying to the screen on GPU

README.md

@@ -29,11 +29,11 @@ is new enough.
 Once docker is installed, run the following command, and the project should show up:
 
 ```
-docker-compose build && xhost +local:root && docker-compose up
+docker-compose build ros && xhost +local:root && docker-compose up ros
 ```
 
 This command does three things:
-1) `docker-compose build`
+1) `docker-compose build ros`
    
    This builds the project in a container. That means nothing is installed on your host machine!
    The first time this runs, this command will take a long while. After running it once, caching 
@@ -43,7 +43,7 @@ This command does three things:
 
    This command gives X the ability to display GUI's from within the docker container
 
-3) `docker-compose up`
+3) `docker-compose up ros`
 
    This runs the image specified in the `docker-compose.yml`, which by default runs
    the command `roslaunch myCobotROS control_slider.launch` within the container.

docker-compose.yml

@@ -1,9 +1,7 @@
-version: '3'
+version: '3.4'
 
-services:
-  ros:
-    image: elephantrobotics/my-cobot-ros
-    command: ["roslaunch myCobotROS control_slider.launch"]
+x-app: &common
+  command: [ "roslaunch myCobotROS control_slider.launch" ]
   privileged: true
   environment:
     PYTHONUNBUFFERED: 1
@@ -13,7 +11,21 @@ services:
     - "/tmp/.X11-unix:/tmp/.X11-unix:rw"
   build:
     context: .
-      args:
-        UBUNTU_VERSION: "16.04"
+    args: &common-args
       ROS_DISTRO: "kinetic"
       PYMYCOBOT_VERSION: ">=2<3"
+      BASE_IMAGE: nvidia/opengl:1.1-glvnd-runtime-ubuntu18.04
+
+
+services:
+  # This configuration builds the project for computers with NVIDIA hardware
+  nvidia-ros: *common
+
+  # This is the default for computers that don't have nvidia hardware accelerators
+  ros:
+    <<: *common
+    build:
+      context: .
+      args:
+        <<: *common-args
+        BASE_IMAGE: ubuntu:18.04