Launch Ubuntu bionic VM with Hyper-V

delete-vm.ps1

$VMName = "Ubuntu Test"

# Delete the VM if it is around
If ((Get-VM -Name $VMName).Count -gt 0) {stop-vm $VMName -TurnOff -Confirm:$false -Passthru | Remove-VM -Force}

launch.ps1

# This script is based on
# https://github.com/BenjaminArmstrong/Hyper-V-PowerShell/blob/8d166e1c2ba71c2b5120bc5490ea9be01891ec74/Ubuntu-VM-Build/BaseUbuntuBuild.ps1
# and modified for Ubuntu bionic.

# Download from http://cloud-images.ubuntu.com/releases/bionic/release/
$imgPath = "${Env:USERPROFILE}\Downloads\ubuntu-18.04-server-cloudimg-amd64.img"

$VMName = "Ubuntu Test"
$virtualSwitchName = "Default Switch"
$vmPath = "${Env:Public}\Documents\Hyper-V\$VMName"

$vhdx = "$($vmPath)\test.vhdx"
$cloudInitIso = "$($vmPath)\metadata.iso"

& .\cloudinitiso.exe -iso $cloudInitIso

# Download qemu-img from http://www.cloudbase.it/qemu-img-windows/
# and extract it to C:\qemu-img
& C:\qemu-img\qemu-img convert -f qcow2 $imgPath -O vhdx -o subformat=dynamic $vhdx
Resize-VHD -Path $vhdx -SizeBytes 100GB

# Create new virtual machine and start it
new-vm $VMName -MemoryStartupBytes 4096mb -VHDPath $vhdx -Generation 1 `
               -SwitchName $virtualSwitchName -Path $vmPath | Out-Null
set-vm -Name $VMName -ProcessorCount 2
Set-VMDvdDrive -VMName $VMName -Path $cloudInitIso
Start-VM $VMName

# Open up VMConnect
Invoke-Expression "vmconnect.exe localhost `"$VMName`""

main.go

package main

import (
	"flag"
	"io"
	"log"
	"os"

	"github.com/diskfs/go-diskfs/filesystem/iso9660"
)

func main() {
	isoFilename := flag.String("iso", "", "output ISO filename")
	flag.Parse()

	err := run(*isoFilename)
	if err != nil {
		log.Fatal(err)
	}
}

func run(isoFilename string) error {
	file, err := os.Create(isoFilename)
	if err != nil {
		return err
	}
	defer file.Close()

	fs, err := iso9660.Create(file, 0, 0, 2048)
	if err != nil {
		return err
	}

	if err = fs.Mkdir("/"); err != nil {
		return err
	}

	if err := addFile(fs, "meta-data"); err != nil {
		return err
	}

	if err := addFile(fs, "user-data"); err != nil {
		return err
	}

	if err := fs.Finalize(iso9660.FinalizeOptions{
		RockRidge:        true,
		VolumeIdentifier: "cidata",
	}); err != nil {
		return err
	}

	return nil
}

func addFile(fs *iso9660.FileSystem, filename string) error {
	src, err := os.Open(filename)
	if err != nil {
		return err
	}
	defer src.Close()

	dest, err := fs.OpenFile("/"+filename, os.O_CREATE|os.O_WRONLY)
	if err != nil {
		return err
	}

	_, err = io.Copy(dest, src)
	if err != nil {
		return err
	}

	return nil
}

user-data

#cloud-config
password: ubuntu
chpasswd:
  expire: false

The empty meta-data is OK, but it needs to be exist.

Build cloudinitiso.exe with the following command.

go build -o cloudinitiso.exe