Instructions

The solution provided works this way:

• Create a Docker-in-Docker image
• Run the image and download docker images from inside
• Create a new image from the running container
• Push the image to a registry

1. Build the base dind image

docker build . -t dind-ddev-base

2. Download ddev images on running container

Run the base image with bash entrypoint:

docker run \
  --privileged -it --rm \
  --name dind-ddev-base \
  --volume $(pwd)/imagelists:/imagelists \
  --entrypoint=bash \
  dind-ddev-base

Run a script that prepares the filesystem and download docker images.

ddev-download-images.sh

By the default the script downloads only the minimal images required by DDEV core.

You can pass additional images lists as arguments. Some lists are provided in imagelists/ folder:

ddev-download-images.sh /imagelists/aljibe.list /imagelists/metadrop.list

Add your custom lists to imagelists/. As an example, you can obtain the list of all images used by a project with:

cd <path-to-ddev-project>
ddev debug compose-config |grep -i image: | grep -v built | awk '{print $2}' | sort | uniq -u > myproject.list
mv myproject.list <path-to-dind-ddev-project>/imagelists

3. Generate a new image fron running container

This generates dind-ddev image with all images inside.

Note we're adding a label to link the generated image to its original repo. If you're generating an image on your own, adjust it to suit your needs.

docker commit \
  --change='ENTRYPOINT ["/usr/local/bin/entrypoint.sh"]' \
  --change='LABEL org.opencontainers.image.source=https://github.com/metadrop/dind-ddev' \
  dind-ddev-base dind-ddev

Now you can stop the container from step 2.

Verify

Run the image:

docker run --privileged --rm --name dind-ddev dind-ddev

Check images are there:

docker exec dind-ddev docker image ls

Publish

export GH_USER=
export CR_PAT=
echo $CR_PAT | docker login ghcr.io -u $GH_USER --password-stdin
LOCAL_IMAGE=dind-ddev
docker image tag $LOCAL_IMAGE ghcr.io/metadrop/dind-ddev/$LOCAL_IMAGE:latest
docker push ghcr.io/metadrop/dind-ddev/$LOCAL_IMAGE:latest