DriveInfo.DriveType reports "unknown" in Windows Subsystem for Linux

[ericeil]

Running on Ubuntu in Windows Subsystem for Linux, on rs_prerelease build 14915, DriveInfo.DriveType reports "Unknown" for both the Linux file system (/, /usr, etc.) and mounted Windows drives (/mnt/c, etc). I would expect it to report "fixed" for at least the Linux file system, and preferably the mounted Windows drives as well.

The df -T command reports file system names for these, so apparently there is some info available:

Filesystem     Type  1K-blocks      Used Available Use% Mounted on
rootfs         lxfs  498859004 167549372 331309632  34% /
data           lxfs  498859004 167549372 331309632  34% /data
cache          lxfs  498859004 167549372 331309632  34% /cache
mnt            lxfs  498859004 167549372 331309632  34% /mnt
none           tmpfs 498859004 167549372 331309632  34% /dev
none           tmpfs 498859004 167549372 331309632  34% /run
none           tmpfs 498859004 167549372 331309632  34% /run/lock
none           tmpfs 498859004 167549372 331309632  34% /run/shm
none           tmpfs 498859004 167549372 331309632  34% /run/user
none           drvfs 498859004 167549372 331309632  34% /mnt/c

(note that / is "lxfs" and /mnt/c is "drvfs."

This causes a failure in the DriveInfo tests (in DriveInfoUnixTests.PropertiesOfValidDrive). I'll be conditionally disabling that test for now.

[sunilmut]

Thanks Eric for reporting this. We have opened a bug internally to track this.

[misenesi]

Discussed with Eric offline. The issues seems to be that the DriveInfo.DriveType doesn't recognize drvfs and lxfs.

[karelz]

It looks like we need another case in switch statement for these 2 file systems in DriveInfo.DriveType.

[weshaggard]

I hit this same test failure when running the tests in an ubuntu docker image on windows.