Re: Module proposal: dconf

[Paolo Borelli <pborelli katamail com>]

Hi,

Il giorno sab, 17/10/2009 alle 02.41 +0100, Sam Thursfield ha scritto:
> On Sat, Oct 17, 2009 at 1:09 AM, Johannes <jhs jsschmid de> wrote:
> > * It is definitly important to keep the user settings over the
> > transition. So at least any setting that is mentioned in a schema file
> > has to be migrated (others are buggy, right?). I cannot say how to do
> > this but I think it is possible.
> >
> > I hope the dconf/GSettings guys will come up with some migration
> > strategy because the are likely the only ones that know about technical
> > details.
> 
> I think we need to pay attention to Ryan's comment that the GSettings
> conversion should be an opportunity for apps to tidy up their schemas
> and use the new features gsettings allows. It's a dead end doing a
> blind gconf->gsettings schema conversion: just think about how much
> richer a type system gvariant is compared to gconf's, for example. I
> know I've committed various hacks around the gconfvalue's limitiations
> and I'm sure there are examples in many gnome apps.
> 

I am sure this is true, but it would really help if you guys provided
examples of these new possibilities for those of us who are not familiar
with gsettings/dconf yet.

> With that in mind, the app is going to need a certain amount of
> involvement in the migration progress. I suggest that when an app
> migrates to gsettings, it provides a mapping in some form of the gconf
> schema to the gsettings schema. A tool can read this and migrate any
> settings in gconf to dconf when the new version is installed - either
> in 'make install' or as a post-install hook in distro packages.
> 
> A couple of points about this:
> - it needs to flag once it has done the conversion, so that old gconf
> settings don't overwrite new dconf settings each time the package is
> upgraded.

I don't think we need an explicit flag: you could check if the seetings
are present in dconf, if not, import them.

Ciao

	Paolo


> - the mapping only needs to mention gconf keys that don't have an
> obvious analogue in the gsettings schema
> - this gives app developers the minimum amount of work while allowing
> them to use new gsettings features
> 
> Sam
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