Re: [coldsync-hackers] Categories in conduits

[Christophe Beauregard <christophe dot beauregard at sympatico.ca>]

On Saturday 21 February 2004 18:49, Marco van Beek wrote:
> Hi All,
>
> I have added some code in one of my conduits to synchronise (fetch, dump
> actually) an application's categories (in this case Memo), and it would
> appear that I can write to the PDB file during the fetch phase (using
> both addCategory and renameCategory), and those changes are there in the
> dump phase. They are still there on the next cycle.
>
> However, this data is not being send down to the palm.

Yeah, I've had to restore a lot from backup lately and I've really noticed 
that categories aren't synched. It's been something that I've wanted to 
fix, but it's a very thorny problem.

> The only conduit I can find is in CVS (std-categories), and that would
> seem to infer that I have to mark the category record as dirty (as you
> would with a standard data record).
>
> If this is the case, is it just a matter of something like:

Not so simple, unless I'm reading wrong. coldsync's generic sync 
(coldsync/src/conduits/generic.cc) ignores the appinfo block. So even if 
you set the dirty flags, your changes won't get sent to the PDA or vice 
versa.

The only way to "sync" the PDA and backup databases is to actually copy the 
AppInfo block directly.

std-categories includes some (commented out) code to handle uploading 
appinfo changes to the PDA. As it's written, it's a one-way copy from the 
PDA to the backup. Actually, it's worse than that because everything up to 
that commented out line seems to assume that all the changes will go all 
the way through.

The copy-appinfo conduit shows how to copy the categories _from_ the PDA, 
although it doesn't try the more sophisticated merge algorithm that 
std-categories does. Copying to the PDA should be about as easy. That might 
be adequate if all you'rem doing is renaming categories.

In any case, you'll need an actual sync conduit to do the work. You won't be 
able to make it happen with just fetch and dump conduits.

c.
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