Re: [Tracker] Prevent removed files from being removed from the db

[Nikolaus Rath <Nikolaus rath org>]

Philip Van Hoof <spam-+mS4aLmNmLKG5XvV6lv2jw public gmane org> writes:
> On Mon, 2010-05-17 at 15:12 -0400, Nikolaus Rath wrote:
> > Philip Van Hoof <spam-+mS4aLmNmLKG5XvV6lv2jw-XMD5yJDbdMReXY1tMh2IBg public gmane org> writes:
> > > > How can Tracker (reliably) detect if a resource is on an external drive?
> > > > I can't believe that this works for anything but the trivial case where
> > > > /dev/sdX is directly mounted. But if the disk is e.g. LUKS encrypted,
> > > > then there's already a device mapper in between. It get's even worse
> > > > with all the possibilities that FUSE and bind mounts offer.
> > >
> > > HAL (or devicekit) has a unique ID for each removable device. We detect
> > > and use this unique ID for this purpose.
> > >
> > > If you can't believe this, why don't you try it?
> >
> > Because don't feel familiar enough with tracker to confirm that the data
> > has really vanished (in contrast to me not being able to find it, see my
> > other mail about problems with searching for a simple test file). 
> >
> > But I don't think there is any need for a demonstration. How can HAL (or
>
> If you don't want to demonstrate the problem, then I'm afraid that we
> don't want to help you.

Don't be so grumpy. I am just trying to learn more about the way tracker
works. Demonstrating the "problem" would have been pointless anyway,
because apparently I did not understand what you consider a removable
device.

> > devicekit, or any other program) possibly know if an arbitrary FUSE file
> > system stores its data on a removable device, the network, or just
> > copies it from /dev/urandom?
>
> > To put it differently, if I ask tracker to index /home/bla, and
> > /home/bla/mnt is a mount point with file system type 'fuse.fusexmp', how
> > are you going to determine if this is removable or not? I don't think
> > there is an API for that.
>
> We don't consider FUSE mountpoints to be removable devices.

Yes, that's what I expected and was worried about. I'm sorry if I
haven't made that clear. Luckily enough, storing the metadata in XMP
sidekick files will solve this problem for me, thanks again for the
info.


> I already explained what we consider to be a removable device. Martyn
> also replied to you that info.

I really don't mean to offend you, but it seems that I missed or
misunderstood that information. I gather that you use GIO and fall back
on HAL/devicekit, but I'm still not sure what devices will qualify as
removable.


Best,

   -Nikolaus

-- 
 ÂTime flies like an arrow, fruit flies like a Banana.Â

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