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Date:	Wed, 11 Jul 2018 10:14:43 +0200
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: Cygwin x86 on Windows 10 ARM64
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On Jul 11 00:36, Andrey Repin wrote:
> Greetings, David Allsopp!
>=20
> > Brian Inglis wrote:
> >> On 2018-07-10 03:51, David Allsopp wrote:
> >> > I've been trying out the x86 emulation in Microsoft's ARM64 version =
of
> >> > Windows 10 1803.
> >> >
> >> > I had two issues with Cygwin x86. The first, which is simple, is that
> >> > Windows doesn't by default create C:\Windows\SysWOW64\drivers\etc
> >> > which causes /etc/postinstall/base-files-mketc.sh to exit with an
> >> > error all the time. I wonder if there's a possible workaround to make
> >> that less intrusive?
> >> > The error message implies that it may have computed the wrong
> >> > directory, which it hasn't - it's just that the directory doesn't ex=
ist.
> >>=20
> >> Do C:\Windows\{System32,SysNative,Sys*}\drivers\etc exist under the
> >> emulator?
> >> What does "cygpath -SU" show?
>=20
> > cygpath -SU gives /proc/cygdrive/c/Windows/SysWOW64
>=20
> > Checking within C:\Windows\SysWOW64\cmd.exe (i.e. x86 cmd):
>=20
> > C:\Windows\System32\drivers\etc exists and contains expected files
> > C:\Windows\Sysnative\drivers\etc exists and contains expected files (lo=
oks identical to System32, as you'd hope)
> > C:\Windows\SysArm32\drivers does not contain an etc directory (but wasn=
't referenced)
> > C:\Windows\SysWOW64\drivers didn't contain an etc directory (I created =
one to silence the error)
>=20
> > So perhaps on WOW64 it would be worth falling back to Sysnative if etc
> > isn't found? Or even just using Sysnative by default in WOW64?
>=20
> I'd suggest using Sysnative unconditionally, and fall back to System32 if
> Sysnative not found.


Did anybody notice my reply from 8 hours earlier?
https://cygwin.com/ml/cygwin/2018-07/msg00091.html


> A better approach would be to make Cygwin trickery aware and just address=
 real
> directories instead of fake ones.
> https://msdn.microsoft.com/en-us/library/windows/desktop/aa365743.aspx

That would break existing scripts.


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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