Support for Docker contexts

[voroninman]

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Description

Look up the Docker host from Docker Context instead of DOCKER_HOST or the hardcoded /var/run/docker.sock. A nice bonus would be to select a context with an argument to the provider.

Potential Terraform Configuration

provider "docker" {
  context = "development"
}

In my particular case I want to the provider to work with https://github.com/abiosoft/colima. For a workaround I do export DOCKER_HOST=$(docker context inspect | jq -r '.[0].Endpoints.docker.Host').

[matifali]

Yes, it should make life easy. Currently, I am using custom logic to extract the host from the selected docker context.

[nathanblair]

Does anyone know if there is a Docker API call with the Docker context information?

I've got a fork with a fix that could work but it just relies on testing the presence of a couple possible docker.sock paths. So not very determinable.

[matifali]

docker context reads from the local ~/.docker/contexts/ directory so it does not have an API. also, this is different for each of the logged-in users.

[cryptiklemur]

This could potentially solve https://github.com/kreuzwerker/terraform-provider-docker/issues/262 as well