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Setting up ssh public key authentication on macOS using a YubiKey 4

I largely followed Florin's blog post, but have a few notes to add regarding issues I encountered:

Basic setup notes

1. I used a YubiKey 4, while the blog describes using a YubiKey NEO. I'm sure a YubiKey 5 would also work. I'm also running macOS 10.13.6.
2. I installed GPGTools as recommended. However, as I'll note later, it seems that gpg-agent only automatically starts when gpg is used; for ssh, you'll need to ensure it's running.
3. Before generating your keys, decide what key size you want to use. If you run the list command inside gpg --edit-card, look for the Key attributes line to see what is currently selected. On my YubiKey 4, it defaulted to 2048 bits for all keys:

Key attributes ...: rsa2048 rsa2048 rsa2048

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{{- range services -}}
  {{- if .Name | contains "sidecar" | not -}}
    {{- $groupedServices := (service .Name | byMeta "caddy_enable") -}}
    {{- $enabledServices := (index $groupedServices "true" ) -}}
    {{- range $enabledServices -}}
      {{- $vhost := index .ServiceMeta "caddy_vhost" -}}
      {{- scratch.MapSetX "vhosts" $vhost . -}}
    {{- end -}}
  {{- end -}}
{{- end -}}  

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package main

import (
	"flag"
	"fmt"
	"log"
	"net/http"
	"os"

	"golang.org/x/net/webdav"

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job web {
  datacenters = ["dc1"]
  type        = "service"
  priority    = 70

  group app {
    count = 1

    task env {
      driver = "exec"

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[LINUX] Factorio Headless Server Guide

So, with credit to the Factorio wiki and cbednarski's helpful gist, I managed to eventually setup a Factorio headless server. Although, I thought the process could be nailed down/simplified to be a bit more 'tutorialised' and also to document how I got it all working for my future records.

The specific distro/version I'm using for this guide being Ubuntu Server 16.04.1 LTS. Although, that shouldn't matter, as long as your distro supports systemd (just for this guide, not a Factorio headless requirement, although most distros use it as standard now). The version of Factorio I shall be using is 0.14.20, although should work for any version of Factorio 0.14.12 and higher.

Just a note to newcomers: If there are any issues with the installation steps, people in the comments are doing a good job

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This document describes the work-in-progress C API for writing custom chips for the Wokwi simulator.

Using the API

First, make sure to include wokwi-api.h. Every external method you declare should be wrapped with the EXPORT macro (e.g. void EXPORT(my_method_name) (uint32_t arg) { ... }). The chip should declare a chip_init method. This method will be called for every new instance of the chip. If the chip has some internal state, chip_init should allocate memory for the internal state and return a pointer to this memory. This pointer will be passed in the first argument for any listener that you declare (e.g. chip_pin_change). For chip without any internal state, simply return NULL.

Here's an example of a minimal chip file:

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<?php

/**
* Lietuviškų vardų linksniai.
*
* @author Maug Lee <mauglee@gmail.com>
* @copyright Copyleft (ↄ) 2011, Maug Lee
* @version 0.3
* @package Vardai
*/

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#!/usr/bin/env bash

# install docker
# https://docs.docker.com/engine/installation/linux/ubuntulinux/

# install docker-compose
# https://docs.docker.com/compose/install/

# install letsencrypt
# https://www.digitalocean.com/community/tutorials/how-to-secure-nginx-with-let-s-encrypt-on-ubuntu-16-04

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/*   
   Copyright 2011 Martin Hawksey

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software

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class MidpointLruCache:
    def __init__(self, size, oldpercentage):
        self.size = size
        self.oldsize = size * oldpercentage / 100
        self.youngsize = size * (100 - oldpercentage) / 100

        self.youngitems = collections.OrderedDict()
        self.olditems = collections.OrderedDict()

    def __call__(self, func):