Cygwin installations directly on root drive
Dr. Volker Zell
vzell@volkerzell.de
Sun Feb 9 13:28:00 GMT 2020
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
     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
     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
Thanks
 Volker
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