Error trying to build over WSL path

[bmc-msft]

Problem
When trying to build a project over a WSL mount, cargo is unable to lock Cargo.lock and generates an error

Steps

1. Install rust in Windows
2. Checkout a simple rust project in WSL (such as /tmp/testing)
3. In powershell, change directories to \\wsl$\<Distro>\tmp\testing, then run cargo build

PS Microsoft.PowerShell.Core\FileSystem::\wsl$\Ubuntu\tmp\testing> cargo build --release
error: failed to lock file: \wsl$\Ubuntu\tmp\testing\Cargo.lock

Caused by:
Incorrect function. (os error 1)
PS Microsoft.PowerShell.Core\FileSystem::\wsl$\Ubuntu\tmp\testing>

Possible Solution(s)

Notes

Output of cargo version:

cargo 1.40.0-nightly (a429e8c 2019-10-04)

[guanqun]

I can reproduce this issue. The root cause is that it's not allowed to acess file (here, locking file) via \\wsl$\<Distro>, from Microsoft's doc, it's more likley a network sharing thing, or implemented via 9p server. I double the locking api from winapi is implemented or even available.

It's purely a platform specific issue, and related to how files within WSL can be accessed in Win app.