AW: Let's discuss about unicode compositions for filenames!

Hi,

Von: Stefan Sperling [mailto:stsp_at_elego.de]
> On Sun, Jan 29, 2012 at 07:38:44PM +0900, Hiroaki Nakamura wrote:
>> I read the note about unicode compositions for filenames
>> http://svn.apache.org/repos/asf/subversion/trunk/notes/unicode-composition-for-filenames and would like to drive the discussion.
[...]
> We could also open the parent directory, read all the filenames within it, normalise them all, and then search the resulting list. This works, expect if a name exists twice, once in NFC form and once in NFD form. We'd somehow have to solve the name collision in the filesystem.

This sounds astonishingly similar to the lower/upper case problem of UN*X vs. Mac/Win.

> But it gets worse. Recall the filesystem name collision problem mentioned above. This problem can also happen in the repository filesystem! For instance, assume that in the repository there already exist two filenames, one NFD, the other NFC, but they both are actually the same name.

The same here. So whatever solution is found for one of those problems could also help to solve (or mitigate) the other problem.

> These are the questions which we'll need to answer to solve this issue.
> I honestly do not have good answers. I hope that you will find ways of solving these problems.

Maybe the best solution to this issue is a client-only solution, in a similar way the case sensitivity problem is tackled.

Best regards

Markus Schaber

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