buildahscript proof of concept

server-build.py

#!/usr/bin/env buildahscript
#| pip: requests
#| arg: eula: bool
#| arg: version: str = "latest"
#| arg: type: str = "vanilla"

with TemporaryDirectory() as td:
    bin = td / 'bin'
    bin.mkdir()
    with workspace('rust:buster') as build:
        build.copy_in('cmd', '/tmp/cmd')
        build.copy_in('localmc', '/tmp/localmc')
        build.run(['cargo', 'build', '--release'], pwd='/tmp/cmd')
        build.copy_out('/tmp/cmd/target/release/cmd', bin / 'cmd')

    with workspace('rust:buster') as build:
        build.copy_in('status', '/tmp/status')
        build.copy_in('localmc', '/tmp/localmc')
        build.copy_in('mcproto-min-async', '/tmp/mcproto-min-async')
        build.run(['cargo', 'build', '--release'], pwd='/tmp/status')
        build.copy_out('/tmp/status/target/release/status', bin / 'status')

    # Download & extract mc-server-runner
    with requests.get('https://github.com/itzg/mc-server-runner/releases/download/1.3.3/mc-server-runner_1.3.3_linux_amd64.tar.gz') as resp:
        resp.raise_for_status()
        with tarfile.open(resp, 'r|*') as tf:
            for entry in tf:
                if entry.name == 'mc-server-runner':
                    tf.extract(entry, bin / 'mc-server-runner')

    with workspace('openjdk:8-jre-slim') as cont:
        cont.copy_in(bin / 'cmd', '/usr/bin/cmd')
        cont.copy_in(bin / 'status', '/usr/bin/status')
        cont.copy_in(bin / 'mc-server-runner', '/mc-server-runner')

        # TODO: Build /mc

        cont.voumes |= {
            "/mc/world", "/mc/server.properties", "/mc/logs",
            "/mc/crash-reports", "/mc/banned-ips.json",
            "/mc/banned-players.json", "/mc/ops.json", "/mc/whitelist.json",
        }
        cont.entrypoint = ["/mc-server-runner", "-shell", "/bin/sh"],
        cont.cmd = ["/mc/launch"],
        cont.healthcheck = ["status"],
        cont.healthcheck_start_period = "5m",

        return cont.commit()