A bash script to pull and recompress the home-assistant docker image for use with older docker installs (eg on Synology DSM 6)

pull_homeassistant_image.sh

#!/usr/bin/env bash
set -euo pipefail

TMP="$(mktemp -d)"
trap 'rm -rf "$TMP"' EXIT

docker run --rm \
    -v "$TMP:/images" \
    --entrypoint sh \
    quay.io/skopeo/stable \
    -ec '
        echo "Pulling image and recompressing layers..."
        skopeo copy \
            --dest-compress \
            --dest-compress-format gzip \
            docker://homeassistant/home-assistant:latest \
            dir:/images/home-assistant

        echo "Creating image tar file..."
        skopeo copy \
            dir:/images/home-assistant \
            docker-archive:/images/home-assistant.tar:homeassistant/home-assistant:latest
    '

echo "Loading image into docker..."
docker load --input "$TMP/home-assistant.tar"