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 > SYSTEMROOT=C:\Windows > WINDIR=C:\Windows > 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 /proc/registry/HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Control/SystemBootDevice; echo multi(0)disk(0)rdisk(1)partition(3) 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: $ /usr/bin/env -i SYSTEMDRIVE="$SYSTEMDRIVE" /usr/bin/env SYSTEMDRIVE=C: SYSTEMROOT=C:\WINDOWS WINDIR=C:\WINDOWS -- Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada This email may be disturbing to some readers as it contains too much technical detail. Reader discretion is advised. -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
