Re: Unicode filenames with Apple File System and UIManagedDocument
Re: Unicode filenames with Apple File System and UIManagedDocument
- Subject: Re: Unicode filenames with Apple File System and UIManagedDocument
- From: Alastair Houghton <email@hidden>
- Date: Thu, 23 Mar 2017 08:53:23 +0000
On 22 Mar 2017, at 18:00, David Duncan <email@hidden> wrote:
>
> So there was another explanation posted on the bug that I’m not certain you got, but which I think may explain.
>
> Basically the concept is that since APFS doesn’t normalize file names, if you store file names in some other storage (say in your preferences) then what could happen is this:
>
> 10.2: File is saved with a file name handed to the file system in NFC form. File system converts the file name to NFD. You store it as NFC.
> 10.3: File system is converted to APFS, and the file name is NFD. You try to look up the file as NFC, and it fails.
This is going to cause problems, though, when things migrate from HFS+ to APFS, because the HFS normalisation *isn’t* a standard one. In particular, it certainly *isn’t* NFD for the current version of Unicode.
The only obvious solution for that would be to have the HFS+ to APFS migration tool *re-normalise* the filenames (maybe it does?), but that’s bound to break things in the (presumably quite common) case where the filename stored in e.g. a plist was originally obtained from the filesystem.
Kind regards,
Alastair.
--
http://alastairs-place.net
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