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Re: Unicode composable characters on macOS [was: Subversion 2.0]

From: Thomas Singer <thomas.singer_at_syntevo.com>
Date: Wed, 26 Jun 2019 19:11:51 +0200

Hi Branko,

Thanks for the detailed explanation. Would you mind to add the
description to the linked issue and mark it as
resolved/works-for-me/no-bug, so this information is not lost?

-- 
Best regards,
Thomas Singer
=============
syntevo GmbH
On 26/06/2019 17:39, Branko Čibej wrote:
> On 26.06.2019 10:40, Marc Strapetz wrote:
>> On 25.06.2019 23:35, Branko Čibej wrote:> On 25.06.2019 19:15, Thomas
>> Singer wrote:
>>>> What I don't like:
>>>> - after more than a decade the umlaut problem of composed/decomposed
>>>> UTF-8 has not been solved
>>>
>>> It has, actually, in Apple's APFS, where the fix belongs.
>>
>> That sounds interesting. Just to be sure, you are referring to this
>> problem:
>>
>> https://issues.apache.org/jira/browse/SVN-2464
>>
>> ? It would be great to have some more information for which OSX
>> version and which file systems the problem should be resolved.
> 
> 
> The original problem was that Apples HFS+ filesystem normalized paths to
> Unicode Normalisation Form D. In practice that meant that if you created
> a file with a name that contained a composable character, then read that
> name from the filesystem, you could get different results (i.e., the
> name was "the same" as far as Unicode normalisation is concerned, but
> the actual representation bytes were different).
> 
> The new APFS filesystem (which is the default in the last two versions
> of macOS, IIRC) doesn't do that any more.
> 
> This is on local disk, which is APFS:
> 
> brane_at_zulu:~/src/svn/test$ svnadmin create repo
> brane_at_zulu:~/src/svn/test$ svn co file://$(pwd)/repo wc
> Checked out revision 0.
> brane_at_zulu:~/src/svn/test$ touch wc/čibej
> brane_at_zulu:~/src/svn/test$ svn add wc/čibej
> A         wc/čibej
> brane_at_zulu:~/src/svn/test$ svn st wc/
> A       wc/čibej
> 
> and this is on an HFS+ disk image:
> 
> brane_at_zulu:/Volumes/hfs$ svnadmin create repo
> brane_at_zulu:/Volumes/hfs$ svn co file://$(pwd)/repo wc
> Checked out revision 0.
> brane_at_zulu:/Volumes/hfs$ touch wc/čibej
> brane_at_zulu:/Volumes/hfs$ svn add wc/čibej
> A         wc/čibej
> brane_at_zulu:/Volumes/hfs$ svn st wc/
> ?       wc/čibej
> !       wc/čibej
> 
> The second instance clearly shows that the filesystem changed the file name.
> 
> -- Brane
> 
> 
Received on 2019-06-26 19:12:09 CEST

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