Start work on an install script and add a Vagrantfile for a VM to run it

.gitignore

@@ -14,3 +14,4 @@ initrd/*
 sysroot/boot/initrd.tar
 serout
 vga_drv/vga_drv
+.vagrant

Vagrantfile

@@ -0,0 +1,69 @@
+# -*- mode: ruby -*-
+# vi: set ft=ruby :
+
+# All Vagrant configuration is done below. The "2" in Vagrant.configure
+# configures the configuration version (we support older styles for
+# backwards compatibility). Please don't change it unless you know what
+# you're doing.
+Vagrant.configure("2") do |config|
+  # The most common configuration options are documented and commented below.
+  # For a complete reference, please see the online documentation at
+  # https://docs.vagrantup.com.
+
+  # Every Vagrant development environment requires a box. You can search for
+  # boxes at https://vagrantcloud.com/search.
+  config.vm.box = "ubuntu/bionic64"
+
+  # Disable automatic box update checking. If you disable this, then
+  # boxes will only be checked for updates when the user runs
+  # `vagrant box outdated`. This is not recommended.
+  # config.vm.box_check_update = false
+
+  # Create a forwarded port mapping which allows access to a specific port
+  # within the machine from a port on the host machine. In the example below,
+  # accessing "localhost:8080" will access port 80 on the guest machine.
+  # NOTE: This will enable public access to the opened port
+  # config.vm.network "forwarded_port", guest: 80, host: 8080
+
+  # Create a forwarded port mapping which allows access to a specific port
+  # within the machine from a port on the host machine and only allow access
+  # via 127.0.0.1 to disable public access
+  # config.vm.network "forwarded_port", guest: 80, host: 8080, host_ip: "127.0.0.1"
+
+  # Create a private network, which allows host-only access to the machine
+  # using a specific IP.
+  # config.vm.network "private_network", ip: "192.168.33.10"
+
+  # Create a public network, which generally matched to bridged network.
+  # Bridged networks make the machine appear as another physical device on
+  # your network.
+  # config.vm.network "public_network"
+
+  # Share an additional folder to the guest VM. The first argument is
+  # the path on the host to the actual folder. The second argument is
+  # the path on the guest to mount the folder. And the optional third
+  # argument is a set of non-required options.
+  # config.vm.synced_folder "../data", "/vagrant_data"
+
+  # Provider-specific configuration so you can fine-tune various
+  # backing providers for Vagrant. These expose provider-specific options.
+  # Example for VirtualBox:
+  #
+  config.vm.provider "virtualbox" do |vb|
+    # Do not display the VirtualBox GUI when booting the machine
+    vb.gui = false
+
+    # Customize the amount of memory on the VM:
+    vb.memory = "4096"
+  end
+  #
+  # View the documentation for the provider you are using for more
+  # information on available options.
+
+  # Enable provisioning with a shell script. Additional provisioners such as
+  # Puppet, Chef, Ansible, Salt, and Docker are also available. Please see the
+  # documentation for more information about their specific syntax and use.
+  config.vm.provision "shell", inline: <<-SHELL
+    apt install ruby
+  SHELL
+end

install.rb

@@ -0,0 +1,94 @@
+#! /usr/bin/env ruby
+require "tempfile"
+usbdisks=`for devlink in /dev/disk/by-id/usb*; do readlink -f ${devlink}; done`
+raws=usbdisks.split("\n")
+parts=[]
+for disk in raws
+  if /(\w+)\d+/.match disk
+    parts.push disk
+  end
+end
+for disk in raws
+  if /(\w+)\d+/.match disk
+    raws.delete("/dev/#{$1}")
+  end
+end
+if raws.length==0
+  puts "No disks detected. Aborting."
+  exit 1
+end
+if parts.length>1
+  puts "Multiple partitions detected."
+  i=0
+  for part in parts
+    puts "#{i}: #{part}"
+    i+=1
+  end
+  print "Please choose partition to install to:"
+  num=gets.chomp.to_i
+  part=parts[num]
+  /(\w+)\d+/.match part
+  raw="/dev/#{$1}"
+elsif parts.length==0
+  puts "No partitions detected."
+  i=0
+  for raw in raws
+    puts "#{i}: #{raw}"
+    i+=1
+  end
+  print "Please choose disk to install to:"
+  num=gets.chomp.to_i
+  raw=raws[num]
+  print "Getting disk size..."
+  origsize=`sudo blockdev --getsize64 #{raw}`.chomp.to_i
+  unit="MB"
+  fullsize=(origsize/1024.to_f)/1024
+  if fullsize%1024==0 or fullsize>2048
+    fullsize=fullsize/1024.to_f
+    unit="GB"
+  end
+  fullsize=fullsize.floor(1)
+  puts "#{fullsize}#{unit}"
+  print "Partition size: (return for whole disk)"
+  size=gets.chomp.downcase
+  if size.match /(\d)+m/ or size.match /(\d+)mb/
+    size=(size.to_i)*1024*1024
+  elsif size.match /(\d)+g/ or size.match /(\d+)gb/
+    size=(size.to_i)*1024*1024*1024
+  elsif size==""
+    size=origsize
+  else
+    puts "Could not parse size. Aborting."
+    exit 1
+  end
+  sfdisk_input="label: dos\n- #{size/1024}KiB L"
+  tmp=Tempfile.new("myosinstall")
+  tmp.puts sfdisk_input
+  tmp.close
+  print "Partitioning..."
+  `cat #{tmp.path} | sudo sfdisk #{raw} 2>/dev/null`
+  puts "Done"
+  tmp.unlink
+  exit 1
+  puts `sudo mkfs.ext2 #{raw}`
+  part="#{raw}1"
+  raw="#{raw}"
+else
+  part=parts[0]
+  /(\w+)\d+/.match parts[0]
+  raw="/dev/#{$1}"
+end
+`mkdir -p usb`
+print "Mounting the disk..."
+`sudo mount #{part} usb`
+puts "Done"
+if !File.exists?("usb/boot")
+  puts "Installing GRUB..."
+  `sudo grub-install --boot-directory=usb/boot #{raw}`
+end
+print "Installing the OS..."
+`sudo cp -r /vagrant/sysroot/* usb`
+puts "Done"
+print "Umounting disk..."
+`sudo umount usb`
+puts "Done"