Batch file to return UNC drive

I have a client environment where installation packages are installed from a server through a service account. Users have a drive mapped to their local distribution server. However, the service account doesn't map any drives. This improves portability amongst the servers, but can trip up packages (and packagers) that assume that the drive mapping is there.

Consequently, I wrote this little batch file that will determine where the package is running from and will return (in the variable _uncshare) the UNC path of the drive. This works whether the batch file is run from a mapped drive or a UNC path. If the batch file is running from a local drive, it just returns the drive letter.

set _drive=
set _uncshare=
set _drive=%~d0
if "%_drive%"=="\\" (
for /f "tokens=1,2 delims=\" %%a in ("%~dp0") do set _uncshare=\\%%a\%%b
) ELSE (
for /f "tokens=2,3" %%a in ('net use') do if /i "%%a"=="%_drive%" set _uncshare=%%b
)
:: Below handles case where we are not running off a mapped drive - 
:: just return drive
if NOT DEFINED _uncshare set _uncshare=%_drive%
echo %_uncshare%