WirePuzzle Mac OS
Setting up X
Install XQuartz (X.Org X Window System that runs on MacOS)
Then in the XQuartz preferences, under the security tab, check the allow connections from network clients button
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Quickstart (tldr)
Given XQuartz is set up
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Find your IP address and allow access to the X server (assuming en0 is your network device)
pull the container
run it with the following environment variables (passing in your localIP to DISPLAY)
Now that’s fun, but let’s go through how the Dockerfile was built, and add a generic script that would ensure it would run on any MacBook.
Wire Puzzle Mac Os X
Building the Dockerfile
Using ubuntu as the base image. Let’s work out the RUN commands we’ll need.
Base software
Let’s install the packages required, xauth, xorg, and sudo since we want your non-root user to be able to escalate to root.
For the games, we’ll install gnome-games and the KDE games. the kdegames package doesn’t exist anymore, so we’ll individually install all the known packages.
Wire Puzzle Mac Os X
User configuration
We’ll create the user ubuntu with sudo privledges
Then set it as default with its home as the WORKDIR, add the /usr/games to PATH
Game list
I’d like the user to have a list of games avaiable with a description for each one. A trick is to use apt-cache search ^packagename$ to get the description, e.g.,
What we can do is run this against all the games in the /usr/games directory and redirect it to a file gamelist that we can output when the container is run. Using some xargs magic, we can speed it up during the build
where the -P flag is for Parallel mode and nproc will print the number of processing units available to the current process, so we can parallelise the process as much as possible.
Entrypoint
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We’ll set the entrypoint to be a script
where it will print the list of games, cd in /user/games, and exec whatever command is passed to the container
Putting it all together
Optimising for layers and image size we now have our Dockerfile
Running the container
I wrote a script that finds the MacBook’s active network device and the local IP, gives it access to the X server, and runs the container
it works as expected
With no arguments passed, the container will cat the gamelist file and give the user an interactive shell in the /usr/games directory. Passing a game name as an argument, the container will simply run the game.
Nice and simple! 👏