efrecon/redis repository overview

⁠Effortless HEALTHCHECK capable redis

This [image][https://hub.docker.com/r/efrecon/redis⁠] is to capture all possible (now, then and future) tags of the redis image and to arrange for creating an equivalent image with the same tag, but HEALTHCHECK-capabilities built in. To check for available tags, refer to the official image⁠.

⁠How

This "fools" the build process by hijacking two of the available hooks⁠, namely build and push. Instead of picking the tag from data coming from settings entered within the hub or the Docker Cloud, both hooks will go and fetch the current list of listed tags from the github project⁠. The implementation is generic enough to be applied to any other official Docker image from the library.

Once these hooks have been defined, it is possible to make the image dependent of the official redis library so that it will recreate all tags and images as soon as anything new has been pushed to it. This is less resource intensive as it sounds as Docker will typically cache most layers. Consequently, out of all the tags that are extracted each time, only a few layers are reconstructed.

In addition, the implementation uses the OCI label org.opencontainers.image.revision⁠ to detect changes. The label will be set to the relevant git revision in this repository. Change detection and image building will only happen for images that have a different checksum. New images from the original image will not yet exist and have an empty label, thus triggering the build process.

Changes to the main redis⁠ are detected through a gitlab project running talonneur⁠ and storing relevant sums using [snippets].