Support linux paths for `startingDirectory` of WSL distros

[tackyunicorn]

• Your Windows build number: Microsoft Windows [Version 10.0.18362.86]

• What you're doing and what's happening:
  Setting the starting directory for wsl in profiles.json doesn't make it point to the right directory.

1. Take the config below :-

{
        "startingDirectory": "C:/Users/joshj/AppData/Local/Packages/CanonicalGroupLimited.Ubuntu16.04onWindows_79rhkp1fndgsc/LocalState/rootfs/home/tackyunicorn",
        "guid": "{a2785f8e-72c9-4550-b406-697388644902}",
        "name": "Ubuntu",
        "colorscheme": "MonokaiVivid",
        "historySize": 9001,
        "snapOnInput": true,
        "cursorColor": "#FFFFFF",
        "cursorHeight": 25,
        "cursorShape": "vintage",
        "commandline": "wsl.exe",
        "fontFace": "Inconsolata for Powerline",
        "fontSize": 10,
        "acrylicOpacity": 1,
        "useAcrylic": true,
        "closeOnExit": true,
        "padding": "10, 10, 10, 10",
        "icon": "ms-appdata:///roaming/ubuntu.png"
}

This results in wsl starting up in the root folder

2. In this config :-

{
        "startingDirectory": "/home/tackyunicorn",
        "guid": "{a2785f8e-72c9-4550-b406-697388644902}",
        "name": "Ubuntu",
        "colorscheme": "MonokaiVivid",
        "historySize": 9001,
        "snapOnInput": true,
        "cursorColor": "#FFFFFF",
        "cursorHeight": 25,
        "cursorShape": "vintage",
        "commandline": "wsl.exe",
        "fontFace": "Inconsolata for Powerline",
        "fontSize": 10,
        "acrylicOpacity": 1,
        "useAcrylic": true,
        "closeOnExit": true,
        "padding": "10, 10, 10, 10",
        "icon": "ms-appdata:///roaming/ubuntu.png"
}

This results in wsl starting up in the Windows user folder

• What's wrong / what should be happening instead:
  The startingDirectory profile setting is not being applied correctly on a wsl profile

[caksoylar]

it looks like it expects Windows paths but passing the WSL fs paths under AppData directly doesn't work. Using the new UNC path works for me:
"startingDirectory":"//wsl$/Ubuntu/home/cem/src" -> ~/src

So do regular Windows locations:
"startingDirectory":"C:/wd" -> /mnt/c/wd

[zadjii-msft]

Hmm. We should maybe add a setting to suggest that the startingDirectory is a wsl path. Right now we're just manually setting the working directory of the client app we're starting, so we'd have to specifically know that the profile was trying to be wsl, and adjust our logic for passing in a working directory.

[sandeepkv93]

one easy hack would be inside ~/.bashrc file of wsl, add the line
cd ~

Problem solved.