Re: git on MacOSX and files with decomposed utf-8 file names

[Kevin Ballard <kevin@xxxxxx>]

On Jan 23, 2008, at 4:40 AM, Mike Hommey wrote:

> On Wed, Jan 23, 2008 at 03:15:02AM -0500, Kevin Ballard  
> <kevin@xxxxxx> wrote:
> > "In Mac OS X,  SMB, MSDOS, UDF, ISO 9660 (Joliet), NTFS and ZFS file
> > systems all store in one form -- NFC.  We store in NFC since that  
> > what
> > is expected for these files systems."
>
> That's the point. It's stored in NFC, but what applications see is  
> NFD.

I was actually asking for you to show this instead of just asserting  
it, but I realized I have access to an SMB share myself so I just  
tested.

And you're right. That's very curious. I guess they did that because  
the entire Carbon stack was written assuming NFD (back at the same  
time HFS+ was created), and they wanted to provide a consistent  
interface to applications. Since the filesystem already uses NFC,  
renormalizing to NFD shouldn't lose anything (want the original  
representation back? just normalize back to NFC).

> > > - Likewise for Samba shares.
> >
> > See above.
> >
> > > - When I had my problems with iso9660 rockridge volumes using NFC  
> > > (you
> > > can create that just fine with mkisofs), the volume is mounted
> > > without
> > > normalisation, i.e. if you get to a shell and want to access files,
> > > you must use NFC, but at least the Finder does transliteration at
> > > some
> > > stage, because going into the mount point and opening some files  
> > > fail
> > > because it's trying to open the file with the name transliterated to
> > > NFD. I just hope the same doesn't happen with other filesystems.
> >
> > Can you produce a reproducible set of steps for this? Because the
> > Finder shouldn't be doing any of this work on its own, all the
> > normalization stuff happens directly in HFS+.
>
> Simple : on a Linux host, create files with NFC names, and create an  
> iso
> image with mkisofs, with rockridge but no joliet. Burn this to a  
> disc, and
> insert the disc in your OSX host, and try to open files from the  
> finder.
> Interestingly, IIRC, Finder is able to copy the files, though.
>
> As a bonus, try the same with an iso volume name in NFC, it's even  
> better :
> the created mount point is NFD, but it tries to mount on the name in  
> NFC and
> fails. And then you just can't eject the CD anymore.

I was actually hoping for something I could test myself.

-Kevin Ballard

--
Kevin Ballard
http://kevin.sb.org
kevin@xxxxxx
http://www.tildesoft.com

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