RE: sed seems to force UC filename on Mixed 8.3 filenames on FAT32

["Michel LaBarre" <michel.labarre@rogers.com>]

> -----Original Message-----
> From: cygwin-owner@cygwin.com [mailto:cygwin-owner@cygwin.com] On
> Behalf Of Corinna Vinschen
> Sent: March 5, 2018 2:55 PM
> To: cygwin@cygwin.com
> Subject: Re: sed seems to force UC filename on Mixed 8.3 filenames on
> FAT32
> 
> On Mar  5 12:46, Michel LaBarre wrote:
> > Sorry folks but I am going to top post for the sake of clarity.  The original
> msg is below for reference.
> >
> > Corinna, I ran the following and I attached the trace file:
> > 	E:\junk>ls > Zot.txt
> > 	E:\junk>ls
> > 	Zot.txt
> > 	E:\junk>strace -o d2u.trace dos2unix -n Zot.txt Zot.txt
> > 	dos2unix: converting file Zot.txt to file Zot.txt in Unix format...
> > 	E:\junk>ls
> > 	ZOT.TXT  d2u.trace
> > [...]
> 
> Thanks.  The culprit is really most likely the system.  Cygwin never
> observes or uses an all-uppercase name while doing its thing.

I agree it is likely the system but it is curious that the only program that readily displays the problem is dos2unix (and unix2dos and mac2unix and unix2mac - I tried them).  

I looked for recent similar issues and only found https://superuser.com/questions/1297658/folder-names-become-uppercase-when-syncing-to-fat32-drive
So if other users of this Win10 build start tripping on this same problem and reporting it, it may get looked at by MS.
If RedHat has some dev contacts, you might have more luck highlighting the issue than riffraff like us.

Fergus: Looking at the first trace file, the very last rename operation looks to be where the final filename is established.  If you were to compile a short program doing exactly that call will little else, you might confirm a minimal reproduceable case.

Here's one last variation:
E:\junk>ls > Abc.txt12

E:\junk>dos2unix Abc.txt12
dos2unix: converting file Abc.txt12 to Unix format...

E:\junk>ls
Abc.txt12

The target name is not 8dot3 conforming and all case is preserved.  Same with  Abcdefghijkl.txt

The target name seems to only fail when it looks to be 8dot3 conforming.

/Michel

> 
> 
> Corinna
> 
> --
> Corinna Vinschen                  Please, send mails regarding Cygwin to
> Cygwin Maintainer                 cygwin AT cygwin DOT com
> Red Hat


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