Test: WSL2 support

[chrmarti]

Ref - #2779

• windows @aeschli
• windows @Tyriar

Complexity: 5

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Preparation

• Install Windows Insiders build 18917 or later and WSL2:
  • https://docs.microsoft.com/en-us/windows/wsl/wsl2-install
  • 'Slow' ring will do it.
  • Install a WSL distro, e.g. Ubuntu, through the Windows Store.
  • Switch that distro to WSL2 (see again above link).
• Install Docker Desktop 'Edge':
  • https://download.docker.com/win/edge/Docker%20Desktop%20Installer.exe
• Enable WSL2 support in Docker Desktop and the WSL distro:
  • https://docs.docker.com/docker-for-windows/wsl-tech-preview/
  • Note that there are two checkboxes, one for the feature and one for the distro, each on a different page of Docker Desktop's settings.

Testing

Test basic operations using Remote-Containers commands and the Remote Explorer while having:

• open a local folder under \\wsl$\Ubuntu\... (if Ubuntu is your distro).
• open the same folder(s) with the Remote-WSL extension.
• while being connected to a container with a WSL folder (starting from one of the two above) as its base.

You don't need to test 'attaching' to an existing container nor opening a container from a repository (these are not using WSL2). Only test opening from a folder with a devcontainer.json:

• with a single container: https://github.com/microsoft/vscode-remote-containers/blob/master/CONTRIBUTING.md#single-container-with-dockerfile-or-image
• and with Docker Compose: https://github.com/microsoft/vscode-remote-containers/blob/master/CONTRIBUTING.md#docker-compose

Check that Git credentials are forwarded from the WSL distro:

• Install Git and a Git credential helper in the WSL distro.
• Verify you can use git on a private repository without being asked for the credentials in the WSL distro.
• Verify you can do the same in a dev container started from a WSL folder.

Notes

If using a Parallels VM, make sure to enable nested virtualization and be generous with RAM and cores:

[aeschli]

Great work!