Identifying drives/volumes

[Federico Mena Quintero <federico ximian com>]

Hi,

For the GtkFileChooser's extension mechanism, I need to be able to
identify drives/volumes through a URI.  Are these guaranteed to refer
uniquely to the corresponding drive/volume?

	gnome_vfs_drive_get_activation_uri()
	gnome_vfs_volume_get_activation_uri()

Background:  a file chooser extension is an implementation of the
abstract interface GtkFileChooserExtensionIface.  This has a virtual
method called "is_volume_visible", which is used to implement lock-down:

	gboolean (* is_volume_visible) (GtkFileChooserExtension *extension,
					const char              *base_uri);

This base_uri is the URI that you would use to get to the root of a
volume.  The idea is that every time the file chooser needs to display
or enter a volume, it first asks the lock-down extension whether that
volume should be visible to the user.

So, I need to know if the activation_uri for a drive/volume is what I
need.  I don't want to expose the opaque GtkFileSystemVolume to
extensions.

  Federico