debootstrap_x86 qemu 자동 설치 스크립트

#!/usr/bin/env bash

set -eux

suite=xenial

debootstrap_dir=$suite
img_file=${suite}.ext4.img
kernel=/vmlinuz
initrd=/initrd.img

sudo apt install -y \
  debootstrap \
  qemu-system-x86 \
;

if [ ! -d "$debootstrap_dir" ]; then
  # Create debootstrap directory.
  sudo debootstrap \
    "$suite" \
    "$debootstrap_dir" \
    http://archive.ubuntu.com/ubuntu \
  ;

  # Set root password.
  echo 'root:root' | sudo chroot "$debootstrap_dir" chpasswd

  # Remount root filesystem as rw.
  cat << EOF | sudo tee "$debootstrap_dir/etc/fstab"
/dev/sda / ext4 errors=remount-ro,acl 0 1
EOF

  # Automaticaly start networking.
  # Otherwise network commands fail with:
  #     Temporary failure in name resolution
  # https://gist.github.com/corvax19/6230283#gistcomment-1940694
  cat << EOF | sudo tee "$debootstrap_dir/etc/systemd/system/dhclient.service"
[Unit]
Description=DHCP Client
Documentation=man:dhclient(8)
Wants=network.target
Before=network.target
[Service]
Type=forking
PIDFile=/var/run/dhclient.pid
ExecStart=/sbin/dhclient -4 -q
[Install]
WantedBy=multi-user.target
EOF

  sudo ln -sf /etc/systemd/system/dhclient.service \
    "${debootstrap_dir}/etc/systemd/system/multi-user.target.wants/dhclient.service"
fi

if [ ! -f "$img_file" ]; then
  # Create disk image
  dd if=/dev/null of="$img_file" bs=1M seek=2048
  mkfs.ext4 "$img_file"
  mnt_dir="${suite}_mnt"
  mkdir "$mnt_dir"
  sudo mount -t ext4 "$img_file" "$mnt_dir"
  sudo cp -r "$debootstrap_dir/." "$mnt_dir"
  sudo umount "$mnt_dir"
  rmdir "$mnt_dir"
fi

sudo qemu-system-x86_64 \
  -append 'console=ttyS0 root=/dev/sda' \
  -drive "file=${img_file},format=raw" \
  -enable-kvm \
  -nographic \
  -serial mon:stdio \
  -m 2G \
  -kernel "$kernel" \
  -initrd "$initrd" \
;