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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 19:44:13 +0000
Message-ID: <2c9fa755-ad12-262b-d175-c20eb8e0b1e5@cornell.edu>
References: <20191204210222 DOT GA3578 AT shackleton DOT labs DOT net> <754a577d-dac1-16e0-56a7-8be8ab1d424c AT cornell DOT edu> <20191205091807 DOT GG3337 AT calimero DOT vinschen DOT de> <20191205125227 DOT GH3337 AT calimero DOT vinschen DOT de> <04da8ce9-0163-8381-644f-cc7c0f81a5f5 AT cornell DOT edu> <20191205191648 DOT GC5146 AT calimero DOT vinschen DOT de>
In-Reply-To: <20191205191648.GC5146@calimero.vinschen.de>
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On 12/5/2019 2:16 PM, Corinna Vinschen wrote:
> On Dec  5 16:10, Ken Brown wrote:
>> 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?
> 
> Not at all.  The strace doesn't show any attempt to open Z:.

Then I wonder what's different about Wilfed's setup that causes an attempt to 
open Z: when it's offline.

I'm grasping at straws, but could the difference be related to the fact that his 
drive Z: is not a Samba share?  Here's an excerpt from the mount output in one 
of his earlier emails (when Z: is online):

V: on /cygdrive/v type smbfs (binary,noacl,posix=0,user,noumount,auto)
W: on /cygdrive/w type smbfs (binary,noacl,posix=0,user,noumount,auto)
X: on /cygdrive/x type smbfs (binary,noacl,posix=0,user,noumount,auto)
Y: on /cygdrive/y type smbfs (binary,noacl,posix=0,user,noumount,auto)
Z: on /cygdrive/z type cifs (binary,noacl,posix=0,user,noumount,auto)
                        ^^^^

Ken

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