vmbuilder for gyf304 / vmcli

ubuntu.sh

#!/bin/bash
set -e

# this script creates a ubuntu VM which the current user's
# username and ssh public key.

# uncomment the following line to keep temp files
skip_cleanup=1

# disk size, default to 4096 mb
disk_size=4096 # 4096 MB

# write default config, change if needed
cat << EOF > vm.conf
kernel=vmlinux
initrd=initrd
cmdline=console=hvc0 irqfixup root=/dev/vda
cpu-count=1
memory-size=1024
disk=disk.img
cdrom=seed.iso
network=nat
EOF

arch="$(/usr/bin/uname -m)"

if [ "$arch" = "x86_64" ]; then
	arch="amd64"
fi

if [ ! -e ~/.ssh/id_rsa.pub ]; then
	echo "cannot find ~/.ssh/id_rsa.pub, stop" >&2
	exit 1
fi

# download files
if [ "$arch" = "amd64" ]; then
/usr/bin/curl -C - -o vmlinux "https://cloud-images.ubuntu.com/releases/focal/release/unpacked/ubuntu-20.04-server-cloudimg-$arch-vmlinuz-generic"
else
/usr/bin/curl -C - -o vmlinux.gz "https://cloud-images.ubuntu.com/releases/focal/release/unpacked/ubuntu-20.04-server-cloudimg-$arch-vmlinuz-generic"
gunzip vmlinux.gz
fi

/usr/bin/curl -C - -o initrd "https://cloud-images.ubuntu.com/releases/focal/release/unpacked/ubuntu-20.04-server-cloudimg-$arch-initrd-generic"

/usr/bin/curl -C - -o disk.tar.gz "https://cloud-images.ubuntu.com/releases/focal/release/ubuntu-20.04-server-cloudimg-$arch.tar.gz"

tar xzvf disk.tar.gz
mv "focal-server-cloudimg-$arch.img" disk.img
rm README

# create cloudinit config
rm -f seed.iso
mkdir iso_folder

cat << EOF > iso_folder/user-data
#cloud-config
users:
  - default
  - name: $USER
    lock_passwd: False
    gecos: $USER
    groups: [adm, audio, cdrom, dialout, dip, floppy, lxd, netdev, plugdev, sudo, video]
    sudo: ["ALL=(ALL) NOPASSWD:ALL"]
    shell: /bin/bash
    ssh-authorized-keys: 
      - $(cat ~/.ssh/id_rsa.pub | head -n 1)
bootcmd:
  - apt remove -y irqbalance
network:
    version: 2
    renderer: networkd
    ethernets:
        enp0s1:
            dhcp4: true
EOF

touch iso_folder/meta-data
hdiutil makehybrid -iso -joliet -iso-volume-name cidata  -joliet-volume-name cidata -o seed.iso iso_folder
rm -rf iso_folder

# expand disk to 4GB
/bin/dd if=/dev/null of=disk.img bs=1m count=0 seek="$disk_size"

# perform clean up
if [ "$skip_cleanup" != "" ]; then
	exit 0
fi

rm disk.tar.gz