case sensitivity bug?

[Brian Inglis]

On 2016-09-21 10:59, Ken Brown wrote:
> On 9/21/2016 12:32 PM, Brian Inglis wrote:
>> On 2016-09-20 18:33, Ken Brown wrote:
>>> I've set up my Cygwin installation to be case sensitive, following the
>>> instructions at
>>> https://cygwin.com/cygwin-ug-net/using-specialnames.html#pathnames-casesensitive
>>> But it doesn't seem to be working as I expect.  For example:
>>> $ mkdir a
>>> $ mkdir A
>>> $ ls -al [aA]
>>> a:
>>> total 100
>>> drwxr-xr-x+ 1 kbrown       None 0 2016-09-20 20:18 ./
>>> drwxrwxrwt+ 1 kbrown-admin None 0 2016-09-20 20:19 ../
>>> A:
>>> total 100
>>> drwxr-xr-x+ 1 kbrown       None 0 2016-09-20 20:19 ./
>>> drwxrwxrwt+ 1 kbrown-admin None 0 2016-09-20 20:19 ../
>>> $ mv a A
>>> mv: cannot move 'a' to a subdirectory of itself, 'A/a'
>>> Why does mv think that A and a are the same directory?
>>> Here's another example, where mv should simply do a rename, but it
>>> doesn't:
>>> $ rmdir A
>>> $ mv a A
>>> $ ls -al a
>>> total 100
>>> drwxr-xr-x+ 1 kbrown       None 0 2016-09-20 20:18 ./
>>> drwxrwxrwt+ 1 kbrown-admin None 0 2016-09-20 20:30 ../
>>> $ ls -al A
>>> ls: cannot access 'A': No such file or directory
>>> cygcheck output is attached.
>> Windows Win32 and WoW are case insensitive but case preserving where the
>> underlying
>> filesystem supports case sensitivity; POSIX subsystem is case sensitive:
>> https://support.microsoft.com/en-us/kb/100625 (N.B. NT 3.1!)
>> Nitty gritties:
>> http://www.nicklowe.org/2012/02/understanding-case-sensitivity-in-windows-obcaseinsensitive-file_case_sensitive_search/
> Thanks for the pointers, but I'm not sure how that's related to my
> bug report. Did you read the section of the Cygwin User Guide that I
> cited?

If Cygwin uses underlying NT... OS calls for all operations, it should be case-sensitive,
but any underlying Win... subsystem calls will be case-insensitive, and YMMV, just as
if you used a native Windows command.

Maybe stat the file and strace that or the failing ls command above to see what's happening.

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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