Re: VFS Permission Management

On 11.06.2012 11:30, Weltall wrote:
> Today the student working on VFSv2 (Eunsoo/touko) asked what to do if
> his idea regarding a Set/GetPermission interface was ok.
> I've discussed it a bit with jorrit and we wanted to see what others
> thing about it.
> Essentially touko suggested these signatures:
> virtual bool GetPermission (const char *FileName, const char *User,
> csFilePermission &oPerm) = 0;
> virtual bool SetPermission (const char *FileName, const char *User,
> const csFilePermission &iPerm) = 0;
> 
> for the interface.
> csFilePermission should have something similar to the unix style (so
> r/w/x or octals) and user would be the "numeric constants on unix, and
> security tokens (user/group) on windows". 

Would ‘User’ control the owner of the file? Or would it rather control
to whom the given permissions apply (i.e. like an ACL)?

> Probably the x flag will have
> to be emulated in windows by doing something (as jorrit noticed) like
> cygwin by checking the extension and setting the +x depending on that.

FWIW, there could perhaps be a method (global constant?) that can be
used to query whether the +x flag is emulated or not.
(I tend towards an actual method – conceivably, there can be
implementations that return that flag correctly on every platform, for
example an archive-based file system.)

> I'm not so sure about the user having a different behaviour depending on
> the os, probably would be better to abstract it more considering also
> that it would be missing the group field on unix systems.

I guess if my first question is answered it will also provide part of an
answer to this.

-f.r.

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