Test: User env variables for dev container features

[chrmarti]

Refs: devcontainers/spec#91

• anyOS @eleanorjboyd
• anyOS @weinand

Complexity: 4

Create Issue

---

• Requires Dev Containers extension 0.261.0.
• Have a workspace folder with the following 3 files:
• .devcontainer/devcontainer.json:

{
	"image": "mcr.microsoft.com/devcontainers/base:0-focal",
	"features": {
		"./test-feature": "latest"
	}
}

• .devcontainer/test-feature/devcontainer-feature.json:

{
	"id": "test-feature"
}

• .devcontainer/test-feature/install.sh:

#!/bin/sh

printenv >/printenv.env

• Reopen this folder in a dev container and verify that /printenv.env has _REMOTE_USER, _CONTAINER_USER, _REMOTE_USER_HOME and _CONTAINER_USER_HOME.
• Add the following to the devcontainer.json:

	"containerUser": "vscode",
	"remoteUser": "root",

• Rebuild the container and verify that /printenv.env has the updated values.

[weinand]

works fine for me on macOS and a Docker container.

[eleanorjboyd]

works as well for me, macOS and Docker container