Re: Discovering if a file is read-only

[Alexander Larsson <alexl redhat com>]

On Thu, 2004-06-10 at 16:26, Murray Cumming wrote:
> On Wed, 2004-06-09 at 12:01 +0200, Alexander Larsson wrote:
> > On Tue, 2004-06-08 at 23:54, Murray Cumming wrote:
> > > I am examining GnomeVfsFileInfo::permissions on a GnomeVfsFileInfo that
> > > I got from gnome_vfs_get_file_info_from_handle() after opening the
> > > GnomeVfsUriHandle with gnome_vfs_open(), with the GNOME_VFS_OPEN_READ
> > > option.
> > > 
> > > When I use it on a local file that is not writable by the group, user,
> > > or others, it does not seem to set the GNOME_VFS_PERM_ACCESS_WRITABLE
> > > flag.
> > >  
> > > So, should I be able to use GNOME_VFS_PERM_ACCESS_WRITABLE to check
> > > whether the file is writable by the current user? Or do I need to use
> > > GNOME_VFS_PERM_USER_WRITE, GNOME_VFS_PERM_GROUP_WRITE,
> > > GNOME_VFS_PERM_OTHERS_WRITE and check whether the user is in the correct
> > > group?
> > 
> > Yes, that is the general idea. However you need to pass
> > GNOME_VFS_FILE_INFO_GET_ACCESS_RIGHTS to get_file_info in the options
> > parameter.
> 
> Oh, yes. We use _DEFAULT as the default value in gnome-vfsmm, but it
> does not seem to do anything useful.
> 
> >  Also, looking at the code this only seems to be implemented
> > for get_file_info, not get_file_info_from_handle().
> 
> That version makes my code look nicer anyway, and it does work. Thanks.
> I was also getting my boolean check for the flag completely wrong.
>  
> >  I guess we need to
> > implement that.  
> 
> I can confirm that. It does not seem to work when using the
> _from_handle: It never sets the GNOME_VFS_PERM_ACCESS_WRITABLE.
> 
> But I don't see where the problem is. I am comparing
> gnome_vfs_get_file_info_uri_cancellable() and
> gnome_vfs_get_file_info_from_handle_cancellable(), which seem to do much
> the same thing.

The problem is in the file module. Compare
modules/file-method.c:do_get_file_info_from_handle and do_get_file_info.

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
 Alexander Larsson                                            Red Hat, Inc 
                   alexl redhat com    alla lysator liu se 
He's a gun-slinging guitar-strumming waffle chef whom everyone believes is 
mad. She's a provocative renegade wrestler from a family of eight older 
brothers. They fight crime!