#!/usr/bin/env bash
# glance_load.sh
#
# A tool for loading a remote image into an OpenStack glance image store.
# This tool has been optimized for use on CoreOS but should work for most files
# where an ETag is exposed.
#
# You will need to source your glance credentials before using this script
#
# By default we retrieve the amd64-usr alpha image, set different values to
# retrieve a specific release

set -e -o pipefail

: ${board:="amd64-usr"}
: ${release:="alpha"}

while [[ $# -gt 0 ]]; do
	case "$1" in
	http*)
		# For this convoluded trick, we take an arbitrary URL, chop it
		# up, and try to turn it into usable input for the rest of the
		# script. This is based on urls of the form:
		# https://storage.flatcar-linux.net/coreos/amd64-usr/master/version.txt
		# where the following sed expression extracts the "master"
		# portion
		baseurl="${1%/*}"
		release="${baseurl##*/}"
		break
		;;
	alpha|beta|stable)
		release="$1"
		;;
	amd64|amd64-usr)
		board="amd64-usr"
		;;
	arm64|arm64-usr)
		board="arm64-usr"
		;;
	*)
		echo "Error: Unknown arg: $1"
		exit 1
		;;
	esac
	shift
done

if [[ -z "${baseurl}" ]]; then
  baseurl="https://${release}.release.flatcar-linux.net/${board}/current"
fi

version_url="${baseurl}/version.txt"
image_url="${baseurl}/flatcar_production_openstack_image.img.bz2"

# use the following location as our local work space
tmplocation=$(mktemp -d /var/tmp/glanceload.XXX)
pushd ${tmplocation} > /dev/null 2>&1

curl --fail -s -L -O ${version_url}
. version.txt
 
# if we already have the image don't waste time
if glance image-show "Flatcar-${release}-v${Flatcar_VERSION}"; then
  echo "Image already exists."
  rm -rf ${tmplocation}
  exit 
fi

flatcarimg="flatcar_${FLATCAR_VERSION}_openstack_image.img"

# change the following line to reflect the image to be chosen, openstack
#  is used by default
curl --fail -s -L ${image_url} |  bunzip2 > ${flatcarimg}
 
# perform actual image creation
#  here we set the os_release, os_verison, os_family, and os_distro variables
#  for intelligent consumption of images by scripts
glance --os-image-api-version 1 image-create --name Flatcar-${release}-v${FLATCAR_VERSION} --progress \
  --is-public true --property os_distro=flatcar --property os_family=flatcar \
  --property os_version=${FLATCAR_VERSION} \
  --disk-format qcow2 --container-format bare --min-disk 6 --file $flatcarimg

# optionally, set --property os_release=${release} in the glance image-create
# command above and uncomment the two commands below to support searching by
# current channel as per CoreOS
#  
# grab UUID of newly created image
# new_glance_uuid=$(glance image-show CoreOS-${release}-v${COREOS_VERSION} | \
#  gawk '/ id / {print $4}')


# purge all previous tags on releases
#glance image-list --property "os_release=$release" \
#  | gawk '$4 ~ /CoreOS/ && !/'"$new_glance_uuid"'/ {printf \
#  "glance image-update --property os_distro=coreos --property \
#  os_family=coreos --property os_version=%s --purge-props %s \n",\
#  gensub(/CoreOS_v/, "", "g", $4), $2}' | sh

popd > /dev/null 2>&1

rm -rf ${tmplocation}

# vim: set ts=2 sw=2 expandtab: