Re: [Tracker] Enhancement proposal: Automatic reindexing when adding new extractors

[Adrien Bustany <madcat mymadcat com>]

On Wed, 17 Feb 2010 14:59:17 +0000, Martyn Russell <martyn lanedo com>
wrote:
> On 17/02/10 14:43, Adrien Bustany wrote:
> > > we don't have to change two files, but simply implement a method of
> > > storing the md5s.
> > But do we have one desktop file per extractor here, or one for Tracker
?
> OK, let me try to be a bit clearer :)
>
> --
>
> Most applications install a .desktop file already. In this .desktop 
> file, the mime type(s) are often included. For example:
>
> Eye of GNOME's desktop file: /usr/share/applications/eog.desktop
MimeType=image/bmp;image/gif;image/jpeg;image/jpg;image/pjpeg;image/png;image/tiff;image/x-bmp;image/x-gray;image/x-icb;image/x-ico;image/x-png;image/x-portable-anymap;image/x-portable-bitmap;image/x-portable-graymap;image/x-portable-pixmap;image/x-xbitmap;image/x-xpixmap;image/x-pcx;image/svg+xml;image/svg+xml-compressed;image/vnd.wap.wbmp;
> So, having our own .desktop file in /usr/share/tracker/extractors just 
> to duplicate the same information (which may become out of sync too) 
> seems wrong to me. Instead, I would rather have a file which has 
> something like:
>
> [eog.desktop]
> DesktopFile=/usr/share/applications/eog.desktop
> ShouldReindex=
>
> and when we install an up to date extractor which has fixes for specific

> mime types, we can then just set the ShouldReindex value to something
like:
> ShouldReindex=image/gif;
>
> and when we are done with the reindex, we can set it to nothing again.

Oooh OK I get it. But how do we are sure an application is installed ?
Should
the pdf extractor, which uses poppler, link to evince's .desktop file ?

> --
>
> Hmm, just considering this a bit more, storing a "state" in a $prefix 
> directory is not really a good idea. This means that once we have (let's

> say) reindexed the data, we would then need root permissions to change 
> the file we keep in $datadir/tracker/extractors.
>
> This also causes problems when trying to think of a cross-user solution.
The state file would be per user, since the database is per user. Stored
in
XDG_CACHE_DIR or something similar.

> > The idea was to be able to update extractors independantly from Tracker
> > itself...
>
> By "update" you mean, change this .ini type file which we keep around 
> with mime types right?
I mean shipping a new version of an extractor, which is independant from
Tracker
(3rd party extractors for example).