Find the latest Ubuntu image serials for AWS, GCP, and Azure

latest-images.sh

#!/bin/bash
# Find the latest Ubuntu image serial for any/all of AWS EC2, GCE, or Azure
# clouds.
#
# Some assumptions are made here about image particulars, e.g. region,
# root storage type, and virtualization type (the latter two are only
# applicable for AWS).
#
# This script uses the image-status snap developed and maintained by the
#   Ubuntu CPC Team:
#   - https://snapcraft.io/image-status
#   - https://github.com/smoser/talk-simplestreams/

snap_binary=$(command -v snap)
snap_path=$(command -v image-status | grep '/snap/bin/')

if [ -z "$snap_binary" ]; then
  echo "This script uses snap packages, which require snapd to be present."
  echo "Find instructions for installing snapd at the following url:"
  echo "https://snapcraft.io/docs/installing-snapd"
  exit 1
fi

if [ -z "$snap_path" ]; then
  echo "This script requires the 'image-status' snap, which is not present on"
  echo "your machine."
  echo "Please install by running 'snap install image-status'"
  exit 1
fi

CLOUD="all"
MINIMAL=""
RELEASE="bionic"
TYPE="daily"

function usage() {
    echo "$0: [-c cloud] 'ec2', 'gce', and 'azure' are supported"
    echo "    [-m] switch to indicate minimal image"
    echo "    [-r release] supported shorthand release names, e.g. 'bionic'"
    echo "                 for 18.04 images or 'xenial' for 16.04"
    echo "    [-t type] 'daily' or 'release' is supported"
    echo ""
    echo "Defaults:"
    echo "              cloud: ${CLOUD}"
    echo "              minimal: false"
    echo "              release: ${RELEASE}"
    echo "              type: ${TYPE}"
}

POSITIONAL=()

for var in "$@"; do
  if [ "$var" = "-m" ]; then
    MINIMAL="-minimal"
  else
    POSITIONAL+=("$var")
  fi
done

set -- "${POSITIONAL[@]}"

while getopts "c:m:r:t:h" opt; do
    case "${opt}" in
    c)  CLOUD="${OPTARG}";;
    m)  MINIMAL="-minimal";;
    r)  RELEASE="${OPTARG}";;
    t)  TYPE="${OPTARG}";;
    h)
        usage
        exit 0
        ;;
    \?)
        echo "Invalid option: -${OPTARG}" >&2
        usage
        exit 1
        ;;
    esac
done

TYPE="-${TYPE}${MINIMAL}"

if [ "$CLOUD" = "all" ] || [ "$CLOUD" = 'ec2' ]; then
  echo "Getting latest ${RELEASE} ec2${TYPE} image..."
  AWS=$(image-status --max 1 ec2"${TYPE}" release="${RELEASE}" region=us-west-2 root_store=ssd virt=hvm 2> /dev/null)
  AWS_SERIAL=$(echo "$AWS" | tr -s ' ' | cut -d ' ' -f2)
  echo "AWS: $AWS_SERIAL"
fi

if [ "$CLOUD" = "all" ] || [ "$CLOUD" = 'gce' ]; then
  echo "Getting latest ${RELEASE} gce${TYPE} image..."
  GCE=$(image-status --max 1 gce"${TYPE}" release="${RELEASE}" region=us-west2 2> /dev/null)
  GCE_SERIAL=$(echo "$GCE" | tr -s ' ' | cut -d ' ' -f2)
  echo "GCE: $GCE_SERIAL"
fi

if [ "$CLOUD" = "all" ] || [ "$CLOUD" = 'azure' ]; then
  echo "Getting latest ${RELEASE} azure${TYPE} image..."
  AZURE=$(image-status --max 1 azure"${TYPE}" release="${RELEASE}" region='West US 2' 2> /dev/null)
  AZURE_SERIAL=$(echo "$AZURE" | tr -s ' ' | cut -d ' ' -f2)
  echo "Azure: $AZURE_SERIAL"
fi