Support for using Data Sources without access to a Docker Daemon

[jbeemster]

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Description

I have a use-case where I want to leverage the docker_registry_image data sources in an environment where I don't have access to a Docker daemon but want to be able to validate that an image exists in a registry and fetch details of that image.

Currently this error comes back:

Error: Error pinging Docker server: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

Would ideally like a way to disable needing access to the Docker daemon so I can still use resources that do not require it.

Potential Terraform Configuration

# Copy-paste your Terraform configurations here - for large Terraform configs,
# please use a service like Dropbox and share a link to the ZIP file. For
# security, you can also encrypt the files using our GPG public key.

provider "docker" {
  disable_docker_daemon_check = true|false # default: false

  registry_auth {
    address  = "registry-1.docker.io"
  }
}

[ankon]

I have a use-case where I want to leverage the docker_registry_image data sources in an environment where I don't have access to a Docker daemon but want to be able to validate that an image exists in a registry and fetch details of that image.

We have exactly the same situation: We're depending on some third-party images that change rarely, and when they do we might miss the changes for quite some time. Ideally we would have the ability to query the registry data for the latest image details (not :latest, but "latest with a tag"), and then flag that an update is needed simply in the terraform plan step (which I could run on a schedule, for instance).