Re: How to get fs index from controller handle.

[Andrew Fish <afish@apple.com>]

> On Apr 6, 2017, at 3:30 AM, Amit kumar <akamit91@hotmail.com> wrote:
> 
> Hi,
> 
> I want to get the fs index from the controller handle.
> e.g In map command i see my controller is mapped to fs10. 
> So i there any API i can use in my code to get the fs index( which is 10 as in example) from the controller handle. 
> 

Amit,

It is important to remember that fs0:, and the other device names are a Shell concept and not an EFI concept. So they only exist in the context of the shell. 

I took a quick look and I did not see an easy way to do this with the current Shell APIs. 

In the older Shell you could use this  protocol  EfiShellEnvironment2 Protocol has a function that converts a EFI_DEVICE_PATH_PROTOCOL (would be on your controller handle) to a CHAR16. Thus you can get the volume name the Shell would display to the user. I don't the index exists as a concept.  So  EFI_SHELL_ENVIRONMENT2.GetFsName() and  EFI_SHELL_ENVIRONMENT2.GetFsDevicepath() are the closest thing I can think of. 
https://github.com/tianocore/edk2/blob/master/ShellPkg/Include/Protocol/EfiShellEnvironment2.h#L812 <https://github.com/tianocore/edk2/blob/master/ShellPkg/Include/Protocol/EfiShellEnvironment2.h#L812>

The only problem with that is EfiShellEnvironment2 is not produced by the Shell by default. 

  ## This flag is used to control the protocols produced by the shell
  #  If TRUE the shell will produce EFI_SHELL_ENVIRONMENT2 and EFI_SHELL_INTERFACE
  gEfiShellPkgTokenSpaceGuid.PcdShellSupportOldProtocols|FALSE|BOOLEAN|0x00000002

I've use the EFI_SHELL_ENVIRONMENT2 in the past to enable a non Shell application to print out volume names that match the map command of the shell. Hopefully some one knows how to do this in the modern Shell?

Thanks,

Andrew Fish

> Regards 
> Amit
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