Containers

Below are the test cases used to confirm container identification. These assume a user is running on Ubuntu 20.04 LTS or later. Essentially, each test case is to launch a container, copy the whatsthis binary over, and run it. Finally, confirm the container is correctly reported.

Docker

snap install docker
docker run --detach --tty --name test ubuntu
docker cp whatsthis test:/
docker exec -it test /whatsthis
docker container rm --force test

LXC

snap install lxc
lxc launch ubuntu-daily:focal test
lxc file push whatsthis test/root/whatsthis
lxc exec test /root/whatsthis
lxc delete --force test

Podman

snap install podman
podman run --detach --tty --name test ubuntu
podman cp whatsthis test:/
podman exec -it test /whatsthis
podman container rm --force test

WSL

Enable WSL

Open a PowerShell console as Administrator and run the following to enable WSL and WSL 2:

dism.exe /online /enable-feature /featurename:Microsoft-Windows-Subsystem-Linux /all /norestart
dism.exe /online /enable-feature /featurename:VirtualMachinePlatform /all /norestart

There is an additional kernel update package required for download here. Once installed, reboot the system to begin using WSL.

For more details see these official instructions here.

WSL Version

To set WSL 2 as the default version run the following as Administrator in a PowerShell console:

wsl --set-default-version 2

It can be helpful to switch between WSL 1 and WSL 2 during testing. Users can list all distributions and change the version of any running distribution by running.

wsl --list --all
wsl --set-version <distro> [2|1]

Testing

Finally, to test the binary on a WSL distribution, copy it from your local filesystem by accessing it from /mnt/c:

cp /mnt/c/Users/<username>/Documents... whatthis
./whatsthis