working dockerfile for mcmap

[deltreey]

I wanted to deploy this separate to my minecraft instance so that the load of building the map didn't interfere with my game. I'm going to do that with a docker container, so I needed mcmap available in that form. I built this for myself, but it could be useful to others, so here you go.

I am not the best with Dockerfiles, so there may be better ways to do some of the steps I did here, but as it sits, it does work and it does output an image -- tested on a 3GB world folder.

Things I would like to improve in the future:

1. I would like to output the map to a stream or something instead of a file, but I'm not familiar enough with the code to change that. This would remove the need for the second volume -- the output folder.
2. I would have preferred to use the gcc docker image as a base, but I can't find a package for debian for qt_sinks.h (it exists in libspdlog-dev on ubuntu but not on debian for some reason)

Building the docker image:

docker build -t mcmap:latest .

Running the docker container:

docker run --rm -v <world-folder>:/input -v <output-folder>:/output mcmap:latest

[spoutn1k]

Looks great ! I noticed a few things that might make the whole process easier though.

[spoutn1k]

Also, using a stream might be doable by implementing a canvas type, but I am not sure if the sequential writes are supported. If not, one could write to a temporary image and then cat it on a target stream.

[deltreey]

alright, build target specification definitely cleaned things up a lot. I tried to figure out a smart way to cat the data to stdout, but i couldn't figure it out. Anything I do modifies the docker command so much that it becomes inflexible for using other features (like outputing other dimensions. If you have other ideas i'm all ears, but here is the improved version