[windows] How to get and format a host disk inside a windows container

[andyzhangx]

Description

The problem here is How to get and format a host disk inside a windows container?.

Background:
I am now implmenting azure disk CSI driver, it works well on Linux, while I am thinking how to enable disk CSI driver on Windows, there is a potential blocking issue here.
On Linux, we usually use volume mapping to map /dev to a container, and we could formant and mount that disk inside a container, that's the solution on Linux.
While on windows, how could I do that since there is no such /dev dir, on kubernetes, I implemented that by Get-Disk powershell command which is actually running on host, code is like following:

	cmd := `Get-Disk | select number, location | ConvertTo-Json`
	output, err := exec.Run("powershell", "/c", cmd)

How to get and format a host disk inside a windows container?
This is a common blocking issue for making all disk related CSI driver work on windows.

cc @jhowardmsft @feiskyer @khenidak @PatrickLang @KnicKnic @taylorb-microsoft

Steps to reproduce the issue:

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Output of docker version:

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Output of docker info:

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[feiskyer]

I don't think it's possible now. We could make CSI services running outside of containers (same as kube-proxy).

[olljanat]

@andyzhangx I assume that you are talking about data drives here? Not the ones where container it selves is running?

On Linux, we usually use volume mapping to map /dev to a container, and we could formant and mount that disk inside a container, that's the solution on Linux.

What prevents you to just mount directory which contains VHDX files inside of container and use it same way than /dev folder on Linux?

[andyzhangx]

@olljanat In that way, the host already mounts that vhdx file to a directory, while in CSI scenario, the mount process should happen inside container. This is the difference between Windows and Linux, in Linux, all devices are files while not for Windows. Anyway, I will try to set POC as a process in windows.

[lowenna]

Closing. This issue is about additional functionality needing feature work from the platform. @andyzhangx Please follow up internally as a first step.