hack: update test dockerfile

[tonistiigi]

The biggest update is the separation of buildkit-containerd and container-runtime stages that can be built into separate containers and used together like.

docker build -t containerd -f ./hack/dockerfiles/test.Dockerfile --target containerd-runtime .

docker build -t buildd-containerd -f ./hack/dockerfiles/test.Dockerfile --build-arg BUILDKIT_TARGET=containerd .

docker run -d --privileged -v /tmp:/tmp:rshared --name containerd containerd

docker run -d --privileged -p 1234:1234 --volumes-from containerd buildd-containerd --addr tcp://0.0.0.0:1234 --debug

docker exec containerd ctr image ls

export BUILDKIT_HOST=tcp://127.0.0.1:1234

buildctl du

@AkihiroSuda Do you have ideas for doing the -v /tmp:/tmp:rshared part better? It is needed for mounting the subpath in buildkit and using it in containerd. Apart from being ugly it doesn't work in docker4mac for example because it tries to mount tmp from osx(/var:/tmp would work but create unexpected files).

While testing this I once got an error failed to prepare because parent doesn't exist so I think there is still some issue with containerd gc. Related to #159

Signed-off-by: Tonis Tiigi [email protected]

[AkihiroSuda]

Do you have ideas for doing the -v /tmp:/tmp:rshared

Does VOLUME /tmp work?

[tonistiigi]

@AkihiroSuda I don't think so. This would just create a shared volume but we need a shared propagation as well so the new mountpoints show up.

[AkihiroSuda]

Let's merge now and consider it again later