VsCode debug Python in docker can not spawn debugger

[mhlg]

I'm following the instructions as for https://code.visualstudio.com/docs/containers/debug-python

this used to work before upgrading docker to version 19.03.13

Python 3.7.6
Docker version 19.03.13, build 4484c46d9d

Create a project folder
mkdir my-project && cd my-project

Create a minimal python file named app.py
`
def main():
print('HELLO')

if name == "main":
main()
`

Create a python3 virtual environment.
python3 -m venv py-venv

setting.json
{ "python.pythonPath": "py-venv/bin/python" }

tasks.json
{ "version": "2.0.0", "tasks": [ { "type": "docker-build", "label": "docker-build", "platform": "python", "dockerBuild": { "tag": "pydockerdebug:latest", "dockerfile": "${workspaceFolder}/Dockerfile", "context": "${workspaceFolder}", "pull": true } }, { "type": "docker-run", "label": "docker-run: debug", "dependsOn": [ "docker-build" ], "python": { "file": "app.py" } } ] }

launch.json
{ "configurations": [ { "name": "Docker: Python - General", "type": "docker", "request": "launch", "preLaunchTask": "docker-run: debug", "python": { "pathMappings": [ { "localRoot": "${workspaceFolder}", "remoteRoot": "/app" } ], "projectType": "general" } } ] }

Create a Dockerfile
`
FROM python:3.8-slim-buster
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

WORKDIR /app
ADD . /app

RUN useradd appuser && chown -R appuser /app
USER appuser

CMD ["python", "app.py"]
`

Run Debug

and the following error occurs

Couldn't spawn debuggee: [Errno 2] No such file or directory: '/Users/.../py_docker_debug/py-venv/bin/python'

Command line:['/Users/.../py_docker_debug/py-venv/bin/python', '/debugpy', '--connect', 'host.docker.internal:52703', '--configure-qt', 'auto', '--adapter-access-token', '875b8dec0efaabdcdfad7028575706dbb916c2d8bde6e3fd8c25da2142db2a8a', 'app.py']

[int19h]

It looks like it'll require some changes on vscode-docker side to fix. I'll follow up in the original repo.

[mhlg]

on vscode-docker side to fix. I'll follow up in the original repo.

Thanks @int19h

[bwateratmsft]

This will be a dupe of #463