Add opencontainer labels to Docker images

[RyanNgWH]

It would be great if the Docker container images had opencontainers labels. I have seen this across multiple other containers and believe this is the standard for labeling images.

https://github.com/opencontainers/image-spec/blob/main/annotations.md

Adding labels such as org.opencontainers.image.version will provide a way to obtain the current version of the running docker image which can be useful in automating the process of checking for updates.

Doing a docker inspect on the current images shows no labels. Here is an example of the Jellyfin docker image with opencontainers labels:

"Labels": {
    "org.opencontainers.image.description": "The Free Software Media System",
    "org.opencontainers.image.documentation": "https://jellyfin.org/docs/",
    "org.opencontainers.image.source": "https://github.com/jellyfin/jellyfin",
    "org.opencontainers.image.title": "Jellyfin",
    "org.opencontainers.image.url": "https://jellyfin.org",
    "org.opencontainers.image.version": "10.9.8"
}

[joshtrichards]

Looks like some of the other Docker Official program images support this. It would require changes to our update script and possibly Dockerfile templates I guess.

MariaDB image's approach:

• https://github.com/MariaDB/mariadb-docker/blob/8b9a47d0544826a8fb7c01b4308b400c3f6e529f/update.sh#L73-L91
• https://github.com/MariaDB/mariadb-docker/blob/8b9a47d0544826a8fb7c01b4308b400c3f6e529f/Dockerfile.template#L69-L79

For us the equivalent would be somewhere around here:

• docker/update.sh

  Lines 106 to 128 in e6d0240

  	template="Dockerfile-${base[$variant]}.template"
  	echo "# DO NOT EDIT: created by update.sh from $template" > "$dir/Dockerfile"
  	cat "$template" >> "$dir/Dockerfile"
  	echo "updating $fullversion [$1] $variant"
  	# Replace the variables.
  	sed -ri -e '
  	s/%%ALPINE_VERSION%%/'"$alpineVersion"'/g;
  	s/%%DEBIAN_VERSION%%/'"$debianVersion"'/g;
  	s/%%PHP_VERSION%%/'"$phpVersion"'/g;
  	s/%%VARIANT%%/'"$variant"'/g;
  	s/%%VERSION%%/'"$fullversion"'/g;
  	s/%%DOWNLOAD_URL%%/'"$(sed -e 's/[\/&]/\\&/g' <<< "$url")"'/g;
  	s/%%DOWNLOAD_URL_ASC%%/'"$(sed -e 's/[\/&]/\\&/g' <<< "$ascUrl")"'/g;
  	s/%%CMD%%/'"${cmd[$variant]}"'/g;
  	s|%%VARIANT_EXTRAS%%|'"${extras[$variant]}"'|g;
  	s/%%APCU_VERSION%%/'"${pecl_versions[APCu]}"'/g;
  	s/%%MEMCACHED_VERSION%%/'"${pecl_versions[memcached]}"'/g;
  	s/%%REDIS_VERSION%%/'"${pecl_versions[redis]}"'/g;
  	s/%%IMAGICK_VERSION%%/'"${pecl_versions[imagick]}"'/g;
  	s/%%CRONTAB_INT%%/'"$crontabInt"'/g;
  	' "$dir/Dockerfile"

• Debian
• Alpine

[J0WI]

docker-library/official-images#3540 (comment)

This doesn't sound very encouraging