#!/bin/bash

#

# deploy-qemu IMAGE USERDATA

#

# Starts an ephemeral virtual machine in qemu, injecting configuration via

# cloud-init. Stopping this script stops the VM and discards all data.

#

# IMAGE    -- An os image that can be booted by qemu and has cloud-init

#             installed and enabled. No changes are made to this file.

#

# USERDATA -- A cloud-init user-data config file, or a directory of

#             configuration as accepted by the `gen-user-data` tool.

#

# In addition, if the QEMU_EXTRA_ARGS environment variable is defined, it adds

# its content as additional arguments to qemu.

set -euo pipefail

if [[ "$#" != 2 ]]; then

  echo "usage: $0 IMAGE USERDATA"

  exit 1

fi

scriptdir=$(dirname "$0")

image=$1

userdata=$2

read -ra qemu_extra_args <<< "${QEMU_EXTRA_ARGS:-}"

workdir=$(mktemp -d "$scriptdir/qemu-tmp-XXXXXX")

function cleanup() {

  rm -rf "$workdir"

}

trap cleanup EXIT

mkdir "$workdir/cidata"

if [ -d "$userdata" ]; then

  "$scriptdir/gen-user-data" "$userdata" > "$workdir/cidata/user-data"

else

  cp "$userdata" "$workdir/cidata/user-data"

fi

echo -e "instance-id: nocloud\nlocal-hostname: vm\n" > "$workdir/cidata/meta-data"

case $(uname -s) in

  "Linux")

    genisoimage \

      -input-charset utf-8 \

      -output "$workdir/cloudinit.iso" \

      -volid cidata \

      -joliet \

      -rock \

      -quiet \

      -graft-points \

      "$workdir/cidata/user-data" \

      "$workdir/cidata/meta-data"

    ;;

  "Darwin")

    # conviently uses the last component of source as volumeid, which has to be cidata

    hdiutil makehybrid -iso -joliet -o "$workdir/cloudinit.iso" "$workdir/cidata"

    ;;

esac

qemu-system-x86_64 \

  -M accel=kvm:hvf \

  -m 1024 \

  -snapshot \

  -cpu host \

  -net nic,model=virtio \

  -net user,hostfwd=tcp::2222-:22,hostfwd=tcp::4430-:443 \

  -cdrom "$workdir/cloudinit.iso" \

  "${qemu_extra_args[@]}" "$image"