VSCode DevContainers: How do you mount a home file on both MAC and Windows - docker

Question

I am using VSCode devcontainers, how do you have a mount section in the devcontainers.json with that is compatible for both windows and MAC? I have a problem accessing the source=... section under the "mounts" section.
// For format details, see https://aka.ms/vscode-remote/devcontainer.json or this file's README at:
// https://github.com/microsoft/vscode-dev-containers/tree/v0.106.0/containers/python-3
{
"name": "Python 3",
"context": "..",
"dockerFile": "Dockerfile",
// Set *default* container specific settings.json values on container create.
"settings": {
"terminal.integrated.shell.linux": "/bin/bash",
"python.pythonPath": "/usr/local/bin/python",
"python.linting.enabled": true,
"python.linting.pylintEnabled": true,
"python.linting.pylintPath": "venv/bin/pylint",
},
// Change <username> to user path (Ex. /Users/vfrank/ on a MAC)
"mounts": [
"source=<full home path>/.aws/credentials,target=/home/vscode/.aws/credentials,type=bind,consistency=cached"
],
// Add the IDs of extensions you want installed when the container is created.
"extensions": [
"ms-python.python"
],
// Use 'forwardPorts' to make a list of ports inside the container available locally.
// "forwardPorts": [],
// Use 'postCreateCommand' to run commands after the container is created.
"postCreateCommand": "echo 'done'",
// Uncomment to connect as a non-root user. See https://aka.ms/vscode-remote/containers/non-root.
"remoteUser": "vscode"
}
Works on MAC but not on Windows
"mounts": [
"source=${localEnv:HOME}${localEnv:USERPROFILE}/.aws/credentials,target=/home/vscode/.aws/credentials,type=bind,consistency=cached"
]
Works on windows but not on MAC
"mounts": [
"source=~/.aws/credentials,target=/home/vscode/.aws/credentials,type=bind,consistency=cached"
]
I have docker file sharing setup for C drive on Windows and /Users on MAC, but the error I am getting when using devcontainers is that the folder or file does not exist. I can make it work on both computers so it is not related to file permissions or access from docker.
I am looking for a single source=... command that works on both Windows (10+) and MAC.

Answer 1

If you do this:
"source=${localEnv:HOME}${localEnv:USERPROFILE}\\.aws\\credentials,target=/root/.aws/credentials,type=bind,consistency=cached"
Then only one expansion will be non-empty on each platform and you will get the result you want.