#!/usr/bin/bash

#
# deploy-openstack IMAGE USERDATA
#
# Starts an openstack instance, injecting configuration via cloud-init. It
# assumes that an openstackrc file has been sourced into the environment.
#
# CONFIG   -- A JSON file containing configuration for an openstack deployment,
#             containing "image", "flavor", "network" (same as openstack server
#             create arguments), and "extra-args".
#
# USERDATA -- A cloud-init user-data config file, or a directory of
#             configuration as accepted by the `gen-user-data` tool.
#

set -euo pipefail

if [[ "$#" != 2 ]]; then
  echo "usage: $0 CONFIG USERDATA"
  exit 1
fi

scriptdir=$(dirname "$0")
config=$1
userdata=$2

# Verify that an openstackrc file has been sourced. This will fail when the
# variables do not exist.
printenv OS_PROJECT_NAME OS_USERNAME > /dev/null

workdir=$(mktemp -d "$scriptdir/qemu-tmp-XXXXXX")
function cleanup() {
  rm -rf "$workdir"
}
trap cleanup EXIT

if [ -d "$userdata" ]; then
  "$scriptdir/gen-user-data" "$userdata" > "$workdir/user-data"
else
  cp "$userdata" "$workdir/user-data"
fi

name=$(jq -r '.name // ""' "$config")
image=$(jq -r '.image // ""' "$config")
flavor=$(jq -r '.flavor // ""' "$config")
network=$(jq -r '.network // ""' "$config")
extra_args=$(jq -r '.extra_args // ""' "$config")

if [[ -z "$name" || -z "$image" || -z "$flavor" ]]; then
  echo "at least 'name', 'image', and 'flavor' must be set in $config"
  exit 1
fi

if openstack server show "$name" 2>/dev/null >/dev/null; then
  echo "server '$name' already exists - delete it with"
  echo ""
  echo "    openstack server stop $name"
  echo "    openstack server delete $name"
  exit 1
fi

openstack server create \
  --wait \
  --image "$image" \
  --flavor "$flavor" \
  --user-data "$workdir/user-data" \
  ${network:+--network "$network"} \
  ${extra_args:+$extra_args} \
  "$name"