docker - 脚本如何区分 Docker Toolbox 和 Docker for Windows？

Question

在我目前的团队中，我们仍在从Docker Toolbox过渡到Docker Desktop for Windows。我们的许多脚本仍然假设您在 VirtualBox 上运行 Docker Toolbox（例如如何挂载驱动器，斜杠或驱动器名称如何为这些挂载工作）。

有没有一种可靠的方法可以从脚本内部判断docker是来自 Docker Toolbox 还是 Docker Desktop for Windows？

Answer 1

#!/usr/bin/env bash

dockerIsToolBox() {
  if [ "${DOCKER_TOOLBOX_INSTALL_PATH}" ];then
    echo true
  else
    echo false
  fi
}

Answer 2

Toolbox works via docker-machine. The way the docker client is directed to the virtual machine is via a number of environment variables which you can see by running docker-machine env default

SET DOCKER_TLS_VERIFY=1
SET DOCKER_HOST=tcp://192.168.99.100:2376
SET DOCKER_CERT_PATH=/user/.docker/machine/machines/default
SET DOCKER_MACHINE_NAME=default
REM Run this command to configure your shell: 
REM     @FOR /f "tokens=*" %i IN ('docker-machine env --shell cmd default') DO @%i

Docker for Mac connects directly to the /var/run/docker.sock socket which is mapped into the Docker VM so this is easy to detect by the lack of environment variables.

I believe Docker for Windows uses a named pipe in the same way (//./pipe/docker_engine) so you should also be able to tell by the lack of DOCKER_HOST in the environment.

If Docker for Windows does still use the environment, there will be differences between the Toolbox and Docker for Windows variables. DOCKER_HOST would be on a different range. DOCKER_CERT_PATH won't include machine etc.