docker: improve description

Author: cirosantilli

README.adoc

@@ -9,7 +9,7 @@
 :toclevels: 6
 :toc-title:
 
-Dozens of minimal operating systems to learn x86 system programming. Tested on Ubuntu 17.10 host in QEMU 2.10 and <<test-hardware,real hardware>>. Userland cheat at: https://github.com/cirosantilli/linux-kernel-module-cheat#userland-assembly ARM baremetal setup at: https://github.com/cirosantilli/linux-kernel-module-cheat#baremetal-setup
+Dozens of minimal operating systems to learn x86 system programming. Tested on Ubuntu 18.04 host in QEMU 2.11 and <<test-hardware,real hardware>>. Userland cheat at: https://github.com/cirosantilli/linux-kernel-module-cheat#userland-assembly ARM baremetal setup at: https://github.com/cirosantilli/linux-kernel-module-cheat#baremetal-setup
 
 :logo: logo.jpg
 link:{logo}[image:{logo}[]]
@@ -125,27 +125,41 @@ TODO: boot sectors that load STAGE2 are not working with the big image chainload
 
 === Getting started with Docker
 
-If you don't have an Ubuntu box, this is an easy alternative:
+If you don't have an Ubuntu box, this is an easy alternative, for the first run:
 
 ....
-sudo docker run -it --net=host ubuntu:14.04 bash
+sudo docker run --interactive --tty --name xbme --net=host ubuntu:18.04 bash
+....
+
+and the following runs:
+
+....
+sudo docker start xbme
+sudo docker exec --interactive --tty xbme bash
+sudo docker stop xbme
+....
+
+and to nuke the container later on:
+
+....
+# sudo docker rm xbme
 ....
 
 Then proceed normally in the guest: install packages, and build:
 
 ....
-apt-get update
-apt-get install git
-git clone https://github.com/cirosantilli/x86-bare-metal-examples
-cd x86-bare-metal-examples
-./configure
+apt-get update && \
+apt-get install -y git && \
+git clone https://github.com/cirosantilli/x86-bare-metal-examples && \
+cd x86-bare-metal-examples && \
+./configure -y && \
 make
 ....
 
 To overcome the lack of GUI, we can use QEMU's VNC implementation instead of the default SDL, which is visible on the host due to `--net=host`:
 
 ....
-qemu-system-i386 -hda main.img -vnc :0
+qemu-system-i386 -hda bios_hello_world.img -vnc :0
 ....
 
 and then on host:

configure

@@ -1,20 +1,28 @@
 #!/usr/bin/env bash
-#
+
 # grub-pc-bin: without it, grub-mkrescue just fails, and you have no idea why!
 # We love you, GRUB.
 # https://superuser.com/questions/603051/grub-mkrescue-not-producing-bootable-image/973021#973021
 # https://github.com/cirosantilli/x86-bare-metal-examples/issues/5#issuecomment-377948357
 # https://wiki.osdev.org/Bare_Bones
-#
-sudo apt-get install \
+
+if [ $# -eq 1 ]; then
+  sudo=
+  y=-y
+else
+  sudo=sudo
+  y=
+fi
+$sudo apt-get install $y \
   bochs \
   bochs-sdl \
   build-essential \
+  gcc \
   gcc-multilib \
   gdb \
   gnu-efi \
-  grub \
   grub-pc-bin \
+  make \
   nasm \
   qemu \
   xorriso\