[Bug] Yarn does not work with WSL / UNC paths

[Stanzilla]

• I'd be willing to implement a fix

Describe the bug

Yarn does not work with WSL / UNC paths

To Reproduce

Run yarn on a project that is in a WSL container / UNC network share

Screenshots

If applicable, add screenshots to help explain your problem.

Environment if relevant (please complete the following information):

• OS: Windows 10 2004
• Node version 13.13.0
• Yarn version [e.g. 2.0.0-rc1, ...] 2.0.0-rc.32

Additional context

Add any other context about the problem here.

[arcanis]

This is likely a matter of adding support for such paths to fromPortablePath / toPortablePath.

[Stanzilla]

@arcanis @paul-soporan

PS Microsoft.PowerShell.Core\FileSystem::\\wsl$\Ubuntu\home\stan\projects\personal\WeakAurasCompanion> yarn
Internal Error: EPERM: operation not permitted, mkdir '\\wsl$\Ubuntu\unc'
Error: EPERM: operation not permitted, mkdir '\\wsl$\Ubuntu\unc'
PS Microsoft.PowerShell.Core\FileSystem::\\wsl$\Ubuntu\home\stan\projects\personal\WeakAurasCompanion> 

[arcanis]

@Stanzilla We currently can't reproduce it - can you dig a bit and post the stacktrace for the problematic mkdir call?

[Stanzilla]

@arcanis how would I do that?

[paul-soporan]

@Stanzilla Can you try the steps below and report back?

1. Create a new project with a package manager that works in WSL 2.
2. Add @yarnpkg/fslib, the package that contains our path and fs implementations.
3. Test the following things inside WSL 2:

const {npath, xfs} = require(`@yarnpkg/fslib`);

// This is an alias for `C:\\` in Windows
const drivePath = npath.toPortablePath(`\\\\?\\C:\\`);
// Your WSL path
const wslPath = npath.toPortablePath(__dirname);

console.log(drivePath);
console.log(wslPath);

// Obviously, you don't have to give us the contents of your folders, just report if there's an error when executing these
console.log(xfs.readdirSync(drivePath));
console.log(xfs.readdirSync(wslPath));

The problem is that currently we can't reproduce your issue. Both the path implementation and the fs implementation seem to work.

[Stanzilla]

❯ node test.js  
\\?\C:\
/home/stan/projects/personal/WeakAurasCompanion
internal/fs/utils.js:230
    throw err;
    ^

Error: ENOENT: no such file or directory, scandir '\\?\C:\'
    at Object.readdirSync (fs.js:968:3)
    at NodeFS.readdirSync (/home/stan/projects/personal/WeakAurasCompanion/node_modules/@yarnpkg/fslib/lib/NodeFS.js:250:32)
    at Object.<anonymous> (/home/stan/projects/personal/WeakAurasCompanion/test.js:12:17)
    at Module._compile (internal/modules/cjs/loader.js:1123:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1143:10)
    at Module.load (internal/modules/cjs/loader.js:972:32)
    at Function.Module._load (internal/modules/cjs/loader.js:872:14)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:71:12)
    at internal/main/run_main_module.js:17:47 {
  errno: -2,
  syscall: 'scandir',
  code: 'ENOENT',
  path: '\\\\?\\C:\\'
}

[paul-soporan]

My bad, I accidentally said "Run it in WSL 2" when I actually meant on Windows, but with the cwd inside the WSL container (Just like you originally tested Yarn when you opened the issue), so that you can test the UNC paths.

[Stanzilla]

//?/C:/
//wsl$/Ubuntu/home/stan/projects/personal/yarntest
[
  '$Recycle.Bin',
  '$WinREAgent',
  'AeroGlass',
  'bootTel.dat',
  'Config.Msi',
  'Dell',
  'Documents and Settings',
  'DumpStack.log',
  'DumpStack.log.tmp',
  'Git',
  'OneDriveTemp',
  'pagefile.sys',
  'Program Files',
  'Program Files (x86)',
  'ProgramData',
  'Recovery',
  'Software',
  'swapfile.sys',
  'System Volume Information',
  'Users',
  'Windows',
  'wslgit'
]
[ 'node_modules', 'package.json', 'index.js', 'yarn.lock' ]

[Stanzilla]

Tried again today:

➤ YN0000: Saving the new release in .yarn/releases/yarn-sources.js
➤ YN0001: Error: EPERM: operation not permitted, mkdir '\\wsl$\Ubuntu\unc'
➤ YN0000: Failed with errors in 2.91m

[merceyz]

I can't reproduce the issue after #1246 got merged so I'll close this.

---

Tried again today:

➤ YN0000: Saving the new release in .yarn/releases/yarn-sources.js
➤ YN0001: Error: EPERM: operation not permitted, mkdir '\\wsl$\Ubuntu\unc'
➤ YN0000: Failed with errors in 2.91m

@Stanzilla It looks like you're trying to update to the new version using the version that doesn't support WSL paths, if I open a WSL path and run yarn set version berry && yarn set version 2.0.0-rc.36 && yarn then it fails as expected since it doesn't contain the fix, now if I run yarn set version 2.1.0 it also fails since 2.0.0-rc.36 is the one trying to write the update in the WSL path which it doesn't support. If you remove the yarnPath entry from .yarnrc.yml and run yarn set version berry it should work.