From c434f513cd97c4d8f16d8e531b179568a15aec3d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tristan=20Dani=C3=ABl=20Maat?= <tm@tlater.net>
Date: Mon, 27 Jul 2020 18:05:19 +0100
Subject: [PATCH] Use a full entrypoint instead of a runAsRoot script for
 minecraft

This needs to be done because the server does not support qemu, and
NixOS requires qemu to use the runAsRoot feature for docker images.

Instead, create the required files as part of the entrypoint.

Fixes #6
---
 etc/nixos/services/minecraft.nix | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/etc/nixos/services/minecraft.nix b/etc/nixos/services/minecraft.nix
index 5a1bb10..9f6e99b 100644
--- a/etc/nixos/services/minecraft.nix
+++ b/etc/nixos/services/minecraft.nix
@@ -1,6 +1,14 @@
 { pkgs, ... }:
 
 let
+  entrypoint = pkgs.writeScript "entrypoint.sh" ''
+                           #!${pkgs.bash}/bin/bash
+                           ${pkgs.busybox}/bin/mkdir -p /var/lib/
+                           ${pkgs.gzip}/bin/gzip -dc ${./configs/minecraft.tar.gz} | ${pkgs.gnutar}/bin/tar -xf - -C /var/lib
+                           echo 'eula=true' > /var/lib/minecraft/eula.txt
+                           cp -f ${properties} /var/lib/minecraft
+                           $@
+                         '';
   ops = pkgs.writeText "ops.json" (builtins.toJSON [
     {
       uuid = "140d177a-966f-41b8-a4c0-e305babd291b";
@@ -72,13 +80,8 @@ in
       imageFile = pkgs.dockerTools.buildImage {
         name = "tlaternet/minecraft";
         tag = "latest";
-        runAsRoot = ''
-          mkdir -p /var/lib/
-          ${pkgs.gzip}/bin/gzip -dc ${./configs/minecraft.tar.gz} | ${pkgs.gnutar}/bin/tar -xf - -C /var/lib
-          echo 'eula=true' > /var/lib/minecraft/eula.txt
-          cp -f ${properties} /var/lib/minecraft
-        '';
         config = {
+          Entrypoint = [ "${entrypoint}" ];
           Cmd = [ "${pkgs.jre_headless}/bin/java"
                   "-Xms2G"
                   "-Xmx2G"