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From:	Ken Brown <kbrown AT cornell DOT edu>
To:	"cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject:	Re: 3.0.7(0.338/5/3): Possible reference to Developer's instances of dev files in deployed build
Date:	Thu, 5 Dec 2019 16:10:00 +0000
Message-ID:	<04da8ce9-0163-8381-644f-cc7c0f81a5f5@cornell.edu>
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On 12/5/2019 7:52 AM, Corinna Vinschen wrote:
> On Dec  5 10:18, Corinna Vinschen wrote:
>> On Dec  4 21:41, Ken Brown wrote:
>>> The difference is that NtCreateFile doesn't fail with
>>> STATUS_OBJECT_NAME_NOT_FOUND in the other cases, so the code containing the
>>> assertion doesn't get run.
>>>
>>> BTW, I just tried the following on my system:
>>>
>>> $ ls z:\\
>>> ls: cannot access 'z:\': No such file or directory
>>>
>>> strace shows that NtCreateFile fails with STATUS_OBJECT_PATH_NOT_FOUND in this
>>> case, so again the code containing the assertion is not run.
>>>
>>> To be continued...
>>
>> So, maybe we could just check if ext_here - path > 2, i. e.
>>
>>      if (status == STATUS_OBJECT_NAME_NOT_FOUND && ext_here - path > 2)
>>
>> That excludes "X:" paths from this special handling for DOS-only drives.
> 
> The only problem here is that I can't reproduce the assertion failure.
> 
> I created a Samba share on a Linux machine, mounted it as drive Z:,
> and set the "always available offline" property of the drive.
> 
> After syncing I accessed the drive, then I stopped Samba on the Linux
> server to switch the drive into offline mode.  Then I ran `ls -la
> /cygdrive/z'.  After a few secs I got the offline content cached on the
> local machine.  I also tried `ls -la /cygdrive/' and `cd /cygdrive; ls
> -la', but every time I got the expected output.  In the cases I tried
> to list /cygdrive itself I got the expected output, all drives except
> the z drive.
> 
> I tried this with Cygwin 3.1.0-0.8.x86_64 on Windows 7 and Windows 10.
> 
> So either there's something very special in Wilfed's setup, or I'm
> doing something wrong.  Which is it?

How does your strace output compare to Wilfed's when you list /cygdrive?  Does 
it show a failed attempt to list Z: with an error from NtCreateFile?

Ken

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