[Tracker] Indexing removable devices on demand

[Felipe Borges <felipe10borges gmail com>]

Hello everyone!

I'm a GSoC student working on Documents[0] in 
order to make it able to handle/manage removable-devices[1]. As a matter of
 fact, Documents uses Tracker to read and store information about 
documents on the system.

My mentor has pointed me that Tracker uses a GSetting to flag 
whether removable-devices are indexable. Since most distros ships 
Tracker with this GSetting toggled "off", and it's not desirable to have Tracker 
indexing removable devices all the time, I would like to work on Tracker
 to make it capable of indexing removable devices on an application 
basis.

As far as I am concerned, Tracker operates by monitoring and indexing files 
on specific places. In summary, we want to enhance Tracker's API to 
provide what is necessary to tell Tracker when and what to index.

I have
 written this e-mail because I want to hear from you how 
desired this feature is and suggestions on how it should be 
implemented. 

[0] https://live.gnome.org/GnomeDocuments
[1] https://live.gnome.org/SummerOfCode2012/Projects/FelipeBorges_DocumentsRemovableDevices