pythonPath not respected in remote container

[syagev]

• VSCode Version: 1.38.1
• Local OS Version: Window 10 1903
• Remote OS Version: Ubuntu 18.04
• Remote Extension/Connection Type: Docker

Steps to Reproduce:

1. Create a project with pipenv
2. In the folder settings.json point pythonPath to the python interpreter in the virtualenv (i.e. something like C:\Users\username\.virtualenvs\SomeProject-09hncfd\bin\python.exe
3. Create a custom Dockerfile based of Ubuntu 18.04 and build image (e.g. my-image:latest), in this image create a virtualenv based on the project's Pipfile using pipenv. Assume the virtualenv (in the image) is created at /root/.local/share/virtualenvs/SomeProject-1298hf
4. Setup remote like so:

"image": "my-image:latest",
"settings": {
  "terminal.integrated.shell.linux": "/bin/bash",
  "python.pythonPath": "/root/.local/share/virtualenvs/SomeProject-1298hf/bin/python",
  "python.linting.enabled": true,
  "python.linting.pylintEnabled": true,
  "python.linting.pylintPath": "/root/.local/share/virtualenvs/SomeProject-1298hf/bin/pylint"
},

5. Open VSCode remote, run the project.
6. An error message appears: "You need to select a Python interpreter ..."

Does this issue occur when you try this locally?: No
Does this issue occur when you try this locally and all extensions are disabled?: No

In remote mode, VSCode doesn't seem to respect the pythonPath settings - it does not find the python in the virtualenv (although it's there). In the terminal the project can be run using either one of these commands:

1. pipenv run myscript.py from the project's folder, or
2. /root/.local/share/virtualenvs/SomeProject-1298hf/bin/python myscript.py

However in the Python Interpreter Selection only the system's Python installs appear (/usr/bin/python3, /usr/local/bin/python3)

Possibly related:
#187
#141

[chrmarti]

Closing in favor of microsoft/vscode-python#7813. Thanks.