Fix $HOME Mounting for WSL

[osterman]

what

• Mounting $HOME to /localhost is not working on WSL (Windows Shell for Linux)

why

• Explain why this is a problem and what is the expected behavior.
• Explain why this feature request or enhancement is beneficial.

examples

This works:

docker run -it --rm -v /C/Users/sebas_000/AppData/Local/lxss/home/martaver:/test alpine sh

This does not:

docker run -it --rm -v /home/martaver:/test alpine sh

Maybe we should do something like in the wrapper script if we detect WSL:

mount --bind /mnt/c /c

or

mount --bind /C/Users/sebas_000/AppData/Local/lxss/home/martaver /home/martaver

references

• geodesic shell doesn't mount $HOME into /localhost correctly cloudposse-archives/root.cloudposse.co#8
• Docker-compose and incorrect absolute paths for volumes microsoft/WSL#1854
• https://superuser.com/questions/1344407/docker-on-wsl-wont-bind-mount-home
• https://nickjanetakis.com/blog/setting-up-docker-for-windows-and-wsl-to-work-flawlessly

[martaver]

There's a current explicit workaround that treats WSL as a special case. The make install script needs to be updated to ensure the vendor script uses the following at line 92:

echo "# Mounting ${HOME} into container"      
      if  [[ $(cat /proc/version) =~ Microsoft ]] ;
      then        
        localHome=/$(cmd.exe /c echo %LOCALAPPDATA% | tr -d '\r' | sed -e 's/\\/\//g' -e 's/://')/lxss$HOME
        echo Detected Windows Subsystem for Linux, mounting $localHome instead of $HOME
      else
        localHome=$HOME
      fi
      DOCKER_ARGS+=(--volume=${localHome}:/localhost)

[martaver]

This script detects WSL, and if it is, figures out the local (windows) directory path to $HOME.

This works because Docker for Windows can see /c as a volume. Using Docker for Windows on hyper-v, hyper-v does not mount any volume as /home/username as in $HOME, and so using the plain $HOME var from WSL fails.

[vadim-hleif]

@martaver Hello,

• Why do you use lxss directory?
• Did you install wsl from market?
• Which version of wsl do you use?

references

• https://stackoverflow.com/questions/39886862/the-lxss-folder-in-windows-for-bash-on-ubuntu-on-windows-is-missing/47193112#47193112

[vadim-hleif]

Fixed