get-latest-sidecar-images

#!/bin/bash
# Copyright 2023 The Kubernetes Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# ---
# Script generates a file with the latest tags and associated manifest digests for each sidecar image at OUTPUT_FILEPATH

set -euo pipefail # Exit on any error

# --- Environment Variables
export SCRIPT_PATH ROOT_DIRECTORY IMAGE_DIGESTS_TEMPLATE_FILEPATH OUTPUT_FILEPATH
SCRIPT_PATH=$(dirname $(realpath "$0"))
ROOT_DIRECTORY="$SCRIPT_PATH/../.."
OUTPUT_FILEPATH=${OUTPUT_FILEPATH:="$ROOT_DIRECTORY/hack/release-scripts/image-digests.yaml"}

tmp_filename=$(mktemp)

# --- Script Tools
log() {
  printf "%s [INFO] - %s\n" "$(date +"%Y-%m-%d %H:%M:%S")" "${*}" >&2
}

check_dependencies() {
  local readonly dependencies=("yq" "git" "crane")

  for cmd in "${dependencies[@]}"; do
    if ! command -v "${cmd}" &>/dev/null; then
      log "${cmd} could not be found, please install it."
      exit 1
    fi
  done
}

error_handler() {
  printf "Error occurred in script: %s, at line: %s. Command: %s. Error: %s\n" "$1" "$2" "$BASH_COMMAND" "$3" >&2
  exit 1
}

trap 'error_handler ${LINENO} $? "$BASH_COMMAND"' ERR

# --- Script
trap 'rm $tmp_filename' EXIT

generate_image_digests_file() {
  touch "$OUTPUT_FILEPATH"

  yq '.sidecars.snapshotter.image = "public.ecr.aws/eks-distro/kubernetes-csi/external-snapshotter/csi-snapshotter"' -i "$OUTPUT_FILEPATH"
  yq '.sidecars.attacher.image = "public.ecr.aws/eks-distro/kubernetes-csi/external-attacher"' -i "$OUTPUT_FILEPATH"
  yq '.sidecars.provisioner.image = "public.ecr.aws/eks-distro/kubernetes-csi/external-provisioner"' -i "$OUTPUT_FILEPATH"
  yq '.sidecars.resizer.image = "public.ecr.aws/eks-distro/kubernetes-csi/external-resizer"' -i "$OUTPUT_FILEPATH"
  yq '.sidecars.livenessProbe.image = "public.ecr.aws/eks-distro/kubernetes-csi/livenessprobe"' -i "$OUTPUT_FILEPATH"
  yq '.sidecars.nodeDriverRegistrar.image = "public.ecr.aws/eks-distro/kubernetes-csi/node-driver-registrar"' -i "$OUTPUT_FILEPATH"
  yq '.sidecars.volumemodifier.image = "public.ecr.aws/ebs-csi-driver/volume-modifier-for-k8s"' -i "$OUTPUT_FILEPATH"
}

crane_get_latest_image_tag() {
  image=$1

  export TAG
  TAG=$(crane ls "$image" | sed '/latest/d' | sort -V | tail -1) # Get tag for $image with latest semvar
}

update_sidecars_source_of_truth() {
  yq '.sidecars | keys | .[]' "$OUTPUT_FILEPATH" >"$tmp_filename"

  for sidecar in $(cat "$tmp_filename"); do
    log "Updating $sidecar in $OUTPUT_FILEPATH"
    image=$(yq ".sidecars.$sidecar.image" "$OUTPUT_FILEPATH")

    export TAG
    crane_get_latest_image_tag "$image"
    yq ".sidecars.$sidecar.tag = env(TAG)" -i "$OUTPUT_FILEPATH"

    export DIGEST
    DIGEST=$(crane digest "$image:$TAG")
    yq ".sidecars.$sidecar.manifestDigest = env(DIGEST)" -i "$OUTPUT_FILEPATH"
  done
}

main() {
  check_dependencies
  generate_image_digests_file
  update_sidecars_source_of_truth
}

main