How to query the value of %SystemDrive% in an empty environment?
Wed Aug 7 11:09:00 GMT 2019
On 8/7/19 4:33 AM, Brian Inglis wrote:
> On 2019-08-06 09:20, Michael Haubenwallner wrote:
>> using 'env -i' to create an empty environment, the SYSTEMROOT and WINDIR
>> environment variables are preserved (or recreated):
>> $ /usr/bin/env -i /usr/bin/env
>> And with cygpath, there is the -A, -D, -H, -O, -P, -S, -W and even -F flags
>> to query the values for various directories.
>> Now what I've failed to find is how to query the value for the "SystemDrive"
>> environment variable.
>> The problem behind is that I'm using "vswhere.exe" to locate some Visual Studio
>> environment from within some scripts run via 'env -i', causing vswhere.exe to
>> create a directory named "%SystemDrive%" in the current working directory:
>> So I better ensure the SystemDrive environment variable is set for vswhere.exe.
>> Any ideas?
> There is a reg entry:
> $ head
> but how do you convert that to a device letter?
> SYSTEMDRIVE is a dynamic env var created at startup pointing to the boot drive
> letter. It is not instantiated anywhere else as far I could find. A number of
> low level reg entries use that env var. Only option is to pass it through:
Heck, even CreateEnvironmentBlock() relies on SYSTEMROOT env var being set,
otherwise returning things like ProgramData="%SystemDrive%\ProgramData".
> $ /usr/bin/env -i SYSTEMDRIVE="$SYSTEMDRIVE" /usr/bin/env
Feels like the Cygwin DLL better should try to keep SYSTEMDRIVE being set, no?
/haubi/ (about to prepare some patch)
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