Re: [Tracker] fd.o compliant thumbnailing

["Edward Duffy" <eduffy gmail com>]

On 1/13/07, Jamie McCracken <jamiemcc blueyonder co uk> wrote:
> Edward Duffy wrote:
> > Ok.  Here's a patch to tracker-thumbnailer to
> >  1) Remove the old style /path/to/mime/type_thumbnailer
> >  2) Support the Thundar style .desktop file
> >  3) If ^^^^^ fails, try gconf's
> > /desktop/gnome/thumbnailers/mime type/command key
> >  4) Add .desktop thumbnailers for OO.o, Dia, pdf, and ps (all depend
> > on imagemagick)
> >
> > The thumbnails that get generated are not immediately found by
> > nautilus (killall nautilus fixes that), however Thundar appears to be
> > tracking ~/.thumbnails, so the thumbnails generated by tracker show
> > up.
> >
>
> thanks - mostly ok but...
>
> a few snags:
>
> 1) do a svn update - bits of quite old code are in your patch
damn.. 20 revisions off.
> 2) I dont like the fact that we are parsing desktop files and checking
> gconf every time the thumbnailer is called.
me neither...I was hoping to find some serialization mechanism in
glib, but no such luck.

> We need to be smarter than that - perhaps stick a GHashTable for
> mime->thumbnailer in the tracker struct (tracker-utils.h) and load all
> the thumbs/mime at trackerd startup rather than each time we index a
> file. That way we can quickly get at the thumbnailer for a mime while
> indexing.
not sure how that would get to tracker-thumbnailer. (?)

> 3) tracker-thumbnailer should set an alarm for the thumbnailer it spawns
> (just in case of reap failure).
this ones been bugging me!  I thought for sure if program A calls
program B which calls program C, and program B dies, program C should
die too!
Guess I'm going to just have to bite the bullet and explicitly set
alarams everywhere.

> if it plays out well we could adopt the same desktop format for text
> filters (and metadata extractors too once I have altered the code for
> that to support external ones like strigii's xmlindexer and third party
> ones as well)
>
> --
> Mr Jamie McCracken
> http://jamiemcc.livejournal.com/