publish-ecr

#!/usr/bin/env bash

# Publish a container image to an ECR repository.

set -o errexit
set -o nounset
set -o pipefail

show_help() {
    >&2 echo "Usage: publish-ecr SOURCE_IMAGE [-p PLATFORM] [-t TAG]"
    >&2 echo ""
    >&2 echo "Publish an XRd container image to ECR"
    >&2 echo ""
    >&2 echo "Required arguments:"
    >&2 echo " SOURCE_IMAGE         Either a path to a local image tarball or"
    >&2 echo "                      a URL to an image repository (with tag)"
    >&2 echo ""
    >&2 echo "Optional arguments:"
    >&2 echo " -h, --help               Show this help"
    >&2 echo " -p, --platform PLATFORM  XRd platform the image is for"
    >&2 echo "                          (defaults to checking the image name)"
    >&2 echo " -t, --tag TAG            Override the target image tag"
    >&2 echo "                          (defaults to 'latest')"
    >&2 echo ""
    >&2 echo "This script requires skopeo when publishing an image archive."
    >&2 echo "When publishing from a repository, at least one of skopeo,"
    >&2 echo "docker, or podman must be available."
}

POSITIONAL_ARGS=()

# Parse the arguments
while [ $# -gt 0 ]; do
  case $1 in
    -p|--platform )
      PLATFORM="$2"
      shift
      ;;
    -t|--tag )
      TAG_OVERRIDE="$2"
      shift
      ;;
    -h|--help )
      show_help
      exit 255
      ;;
    -* )
      >&2 echo "Unknown option $1"
      show_help
      exit 1
      ;;
    * )
      POSITIONAL_ARGS+=("$1")
      ;;
  esac
  shift
done

if [ ${#POSITIONAL_ARGS[@]} -ne 1 ]; then
  >&2 echo "Exactly one positional arg required: SOURCE_IMAGE"
  show_help
  exit 1
fi

SOURCE_IMAGE=${POSITIONAL_ARGS[0]}

if [ -n "${PLATFORM:-}" ]; then
  if [ "$(echo "$PLATFORM" | tr "[:upper:]" "[:lower:]")" = "vrouter" ]; then
    TARGET_IMAGE_NAME=xrd/xrd-vrouter
  elif [ "$(echo "$PLATFORM" | tr "[:upper:]" "[:lower:]")" = "controlplane" ]; then
    TARGET_IMAGE_NAME=xrd/xrd-control-plane
  else
    >&2 echo "Invalid platform: ${PLATFORM}"
    >&2 echo "Must be either vrouter or controlplane (case-insensitive)"
    >&2 echo ""
    show_help
    exit 1
  fi
else
  case $(tr "[:upper:]" "[:lower:]" <<< "$SOURCE_IMAGE") in
    *vrouter* )
      TARGET_IMAGE_NAME=xrd/xrd-vrouter
      ;;
    *control-plane*|*controlplane* )
      TARGET_IMAGE_NAME=xrd/xrd-control-plane
      ;;
    * )
      >&2 echo "Unable to get platform from source image name."
      >&2 echo "Please specify -p or --platform with the XRd platform name (vrouter or controlplane)"
      exit 2
  esac
fi

# Check if an executable with the given name is in PATH.
# (without printing anything to console)
is_in_path () {
  type -P "$1" &> /dev/null
}

# Check what tool to use.
# Ordering is skopeo preferred, then docker, then podman.
if is_in_path "skopeo"; then
  TOOL=skopeo
elif is_in_path "docker"; then
  TOOL=docker
elif is_in_path "podman"; then
  TOOL=podman
else
  >&2 echo "None of skopeo, docker, or podman available"
  exit 3
fi

ACCOUNT_ID=$(aws sts get-caller-identity --query "Account" --output text)
AWS_REGION=$(aws configure list | grep region | awk '{print $2}')

TARGET_REGISTRY="${ACCOUNT_ID}.dkr.ecr.${AWS_REGION}.amazonaws.com"

# Log into the registry.
aws ecr get-login-password | $TOOL login --username AWS --password-stdin "${TARGET_REGISTRY}"

# Create the target repository if it doesn't exist.
aws ecr create-repository --repository-name "${TARGET_IMAGE_NAME}" || true

# Generate out the target image name.
if [ -f "$SOURCE_IMAGE" ]; then
  # Local image archive. Assume the tag is 'latest'.
  SOURCE_IMAGE_TAG="latest"
else
  # Repository URL. Try and extract the tag, if not found assume 'latest'.
  # Strip the largest prefix before (and including) ':'
  # This means if no tag is specified, the tag will be set to the full
  # image name, so check that after.
  SOURCE_IMAGE_TAG=${SOURCE_IMAGE#*:}
  if [ "$SOURCE_IMAGE_TAG" = "$SOURCE_IMAGE" ]; then
    # No tag specificed - assume it's 'latest'.
    SOURCE_IMAGE_TAG="latest"
  fi
fi

TARGET_IMAGE_TAG=${TAG_OVERRIDE:-$SOURCE_IMAGE_TAG}
TARGET_IMAGE="${TARGET_REGISTRY}/${TARGET_IMAGE_NAME}:${TARGET_IMAGE_TAG}"

# Publish the image to ECR.
if [ -f "$SOURCE_IMAGE" ]; then
  # Local image archive - only skopeo supported.
  if [ $TOOL != "skopeo" ]; then
    >&2 "Copying local image only supported with skopeo"
    exit 1
  fi
  $TOOL copy "docker-archive:${SOURCE_IMAGE}" "docker://${TARGET_IMAGE}"
else
  # Container repo URL - all tools supported.
  if [ $TOOL = "skopeo" ]; then
    $TOOL copy "docker://${SOURCE_IMAGE}" "docker://${TARGET_IMAGE}"
  else
    $TOOL pull "${SOURCE_IMAGE}"
    $TOOL tag "${SOURCE_IMAGE}" "${TARGET_IMAGE}"
    $TOOL push "${TARGET_IMAGE}"
  fi
fi

echo "Image is now available at ${TARGET_IMAGE}"