A helper script to create xhyve virtual machines with cloud-init support.

xhyvemake-instance.sh

#!/bin/sh
# Copyright (c) 2020 Georgios Politis
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.

XHYVE_HOME=${XHYVE_HOME:-"$HOME/Virtual Machines"}

oups () {
  echo "$1" 1>&2
  exit 1
}

usage () {
  oups "Usage: $0 INSTANCE_NAME DISK_IMAGE [--vcpus=VCPUS] [--memory=MEMORY]"
}

if [ $# -lt 2 ]
then
  usage
fi

INSTANCE_NAME="$1"
INSTANCE_HOME="$XHYVE_HOME/$INSTANCE_NAME"
if [ -d "$INSTANCE_HOME" ]
then
  oups "The specified instance already exists."
fi

MACHINE_HOME="$2"
MACHINE_DISK="$MACHINE_HOME/disk.img"
MACHINE_VMLINUZ="$MACHINE_HOME/vmlinuz"
MACHINE_INITRD="$MACHINE_HOME/initrd"
if [ ! -f "$MACHINE_DISK" -o ! -f "$MACHINE_VMLINUZ" -o ! -f "$MACHINE_INITRD" ]
then
  oups "The machine is not found."
fi

mkdir -p "$INSTANCE_HOME"

INSTANCE_SEED_DIR=`mktemp -d`
INSTANCE_SEED_ISO="$INSTANCE_HOME/seed.iso"
INSTANCE_METADATA="$INSTANCE_SEED_DIR/meta-data"
INSTANCE_USERDATA="$INSTANCE_SEED_DIR/user-data"

cat << EOF > $INSTANCE_USERDATA
#cloud-config
ssh_authorized_keys:
  - `cat $HOME/.ssh/id_rsa.pub`
packages:
  - python
  - avahi-daemon
EOF

cat << EOF > "$INSTANCE_METADATA"
local-hostname: $INSTANCE_NAME
EOF

hdiutil makehybrid -o "$INSTANCE_SEED_ISO" -hfs -joliet -iso -default-volume-name cidata "$INSTANCE_SEED_DIR"

rm -rf "$INSTANCE_SEED_DIR"

INSTANCE_LAUNCH="$INSTANCE_HOME/xhyverun-instance.sh"
INSTANCE_DISK="$INSTANCE_HOME/disk.img"
INSTANCE_VMLINUZ="$INSTANCE_HOME/vmlinuz"
INSTANCE_INITRD="$INSTANCE_HOME/initrd"
INSTANCE_CPU=1
INSTANCE_MEM=1G

qemu-img convert -O raw "$MACHINE_DISK" "$INSTANCE_DISK"
ln "$MACHINE_VMLINUZ" "$INSTANCE_VMLINUZ"
ln "$MACHINE_INITRD" "$INSTANCE_INITRD"

cat << EOF > "$INSTANCE_LAUNCH"
#!/bin/sh

exec xhyve \\
  -A \\
  -c $INSTANCE_CPU \\
  -m $INSTANCE_MEM \\
  -s 0:0,hostbridge \\
  -s 2,virtio-net \\
  -s 3:0,ahci-cd,"$INSTANCE_SEED_ISO" \\
  -s 4,virtio-blk,"$INSTANCE_DISK" \\
  -s 31,lpc \\
  -l com1,stdio \\
  -f "kexec,$INSTANCE_VMLINUZ,$INSTANCE_INITRD,earlyprintk=serial console=ttyS0 root=/dev/vda1 ro"
EOF

chmod +x "$INSTANCE_LAUNCH"