Cygwin installations directly on root drive

[Ken Brown]

On 2/9/2020 8:28 AM, Dr. Volker Zell wrote:
> Hi
> 
> I always installed my Cygwin environment on the root of a dedicated drive (for 
> example D:)
> instead of the Setup.exe suggested subdirectory (for example D:\cygwin)
> 
> I recently upgraded my Cygwin system from cygwin1.dll (version 3.0.9) to the 
> latest 3.1.2-1 package.
> 
> Now whenever I call an executable linked with this dll I get the following stack 
> trace:
> 
> [04:38]D:\>Cygwin.bat
>  Â Â Â Â Â  0 [main] bash (5368) D:\bin\bash.exe: *** fatal error - add_item 
> ("\??\D:", "/", ...) failed, errno 22
> Stack trace:
> Frame        Function    Args
> 000FFFFABCCÂ  001800614DE (0018028087A, 0018025A1B9, 00800010000, 000FFFF8B40)
> 000FFFFABCCÂ  00180049249 (000FFFF9BC0, 000FFFFABCC, 00000000000, 00000000000)
> 000FFFFABCCÂ  00180049282 (000FFFF9BC0, 00000000016, 00800010000, 3A445C3F3F5C)
> 000FFFFABCCÂ  001800E23DC (000FFFFCBC0, 000FFFFCE00, 001800D2F78, 00000000000)
> 000FFFFCCD0Â  00180132725 (001800CB15C, 00000000000, 00000000000, 00000000000)
> 000FFFFCCD0Â  00180049873 (00000000000, 00000000000, 00000000000, 00000000000)
> 00000000000Â  00180048353 (00000000000, 00000000000, 00000000000, 00000000000)
> 000FFFFFFF0Â  00180048404 (00000000000, 00000000000, 00000000000, 00000000000)
> End of stack trace
> 
> [04:42]D:\>pwd
>  Â Â Â Â Â  0 [main] pwd (3192) D:\bin\pwd.exe: *** fatal error - add_item ("\??\D:", 
> "/", ...) failed, errno 22
> Stack trace:
> Frame        Function    Args
> 000FFFFABCCÂ  001800614DE (0018028087A, 0018025A1B9, 00800010000, 000FFFF8B40)
> 000FFFFABCCÂ  00180049249 (000FFFF9BC0, 000FFFFABCC, 00000000000, 00000000000)
> 000FFFFABCCÂ  00180049282 (000FFFF9BC0, 00000000016, 00800010000, 3A445C3F3F5C)
> 000FFFFABCCÂ  001800E23DC (000FFFFCBC0, 000FFFFCE00, 001800D2F78, 00000000000)
> 000FFFFCCD0Â  00180132725 (001800CB15C, 00000000000, 00000000000, 00000000000)
> 000FFFFCCD0Â  00180049873 (00000000000, 00000000000, 00000000000, 00000000000)
> 00000000000Â  00180048353 (00000000000, 00000000000, 00000000000, 00000000000)
> 000FFFFFFF0Â  00180048404 (00000000000, 00000000000, 00000000000, 00000000000)
> End of stack trace
> 
> 
> The only mention of "\\??\\D:" seems to come from the 
> ""HKEY_CURRENT_USER\Software\Cygwin\Installations"
> registry entry (see below)
> 
> I then tried new base installations under "D:\cygwin", "C:\" and "C:\cygwin":
> 
> Windows Registry Editor Version 5.00
> 
> [HKEY_CURRENT_USER\Software\Cygwin\Installations]
> "8aa36a1fe80b21a1"="\\??\\D:" <=== Broken
> "c5e39b7a9d22bafb"="\\??\\C:\\cygwin" <=== OK
> "1720b01b097bf4fc"="\\??\\D:\\cygwin" <=== OK
> "2af6b8d6450bff37"="\\??\\C:" <=== Broken
> 
> It looks like installations directly to the root of a drive DO NOT work anymore, 
> although the Cygwin
> installer still allows it (with a warning).
> 
> This all seems to be related to a patch mentioned in 
> https://cygwin.com/ml/cygwin/2019-09/msg00255.html
> 
> 
> My big problem is: ALL of my Cygwin installations on different systems now will 
> break
> during upgrade because of the initial Root-Drive install. Also the rest of my 
> ecosystem
> assumes this Root-Drive install and its a nightmare to fix.
> 
> Any chance this type of installation can be supported again?
> 
> I found a mention of Ken Brown "I think I see how to fix this.  I'll submit a 
> patch within the next few days."
> in https://cygwin.com/ml/cygwin/2020-01/msg00129.html

This has been fixed for cygwin-3.1.3, which should be released soon.  A 
workaround in the meantime is to install the latest snapshot and then re-run 
setup.  Or revert to cygwin-3.0.7.

Ken

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