[OpenAFS-devel] AFS vs UNICODE

[Jeffrey Altman]

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Erik Dal=E9n wrote:
> On Sat, Jul 19, 2008 at 5:13 AM, Jeffrey Altman
> <jaltman@secure-endpoints.com> wrote:
>> Erik Dal=E9n wrote:
>>> On Wed, Jul 16, 2008 at 9:38 PM, Jeffrey Altman
>>> <jaltman@secure-endpoints.com> wrote:
>>> <snip>
>>>> All directory searches and file comparisons are performed by normali=
zing
>>>> the
>>>> input from Windows and the strings from the file servers prior to
>>>> performing
>>>> the comparison.   However, non-normalized strings are always deliver=
ed to
>>>> the operating system.
>>> So, if you have an existing file in normalization D it is not possibl=
e
>>> to write a file in normalization C but otherwise the same name?
>>> (assuming it contains a composed character in the file name)
>> It doesn't matter what the normalization or lack of normalization.
>> The Windows client will only permit one instance to be created.
>
> But the two copies could be created on a Mac and Linux client. Just
> type "touch t=EBst" on both those platforms and you'll get two differen=
t
> files.
>
Other platforms do not use Normalization for comparisons.   They will=20
screw their users.
>>> But otherwise the windows clients use normalization C for files they
>>> create, right?
>> The Windows client does not normalize what is written to the file serv=
er.
>>  It writes to the file server whatever was received from Windows.
>
> But the default for windows is normalization C, right?
Windows does not normalize.  Its whatever the input mechanism produces.
>
>>> If there is two files with the same name but different normalizations=

>>> will the windows client always open and write to the one with
>>> normalization C?
>> No.  It will prefer an exact match and if that does not exist then it
>> will not permit either to be opened because the choice is ambiguous.
>> This is exactly the same behavior as is performed for case insensitive=

>> matches.
>
> Ok, so then it should be possible to open both, sounds good.
The Windows client code is correct.  The question is how we are going to =

deal with this stuff
for platforms where the process locale is not guaranteed to be UTF-8. =20
We need to figure out
how ZFS which does Unicode normalization is handling this.







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