[Kde-pim] Akonadi mail migration

[Kevin Krammer]

On Tuesday, 2009-06-30, Jon Armond wrote:

> In the current incarnation the kmail migrator simply goes through the list
> of accounts creating corresponding akonadi resources.
>
> As Kevin notes, folders are more complex because some are depended on by
> some accounts and can be made of mixed maildir/mbox trees.
>
> So I'm going to write something that constructs a skeletal representation
> of the folder tree, migrates that to akonadi LocalFolders (asking questions
> as necessary), fixing up the config file (so accounts and filters etc still
> point at the right folders). Then migrating the accounts is simple.

Right.
I think the key is to transform the tree, a bit like applying a XSLT 
transformation but with several processing phases and potentially 
asynchronous.

Phase one: build current trees (imap and dimap should at least be represented 
by a top level node) from on-disk structure and config.

Phase two: evaluate current situation, e.g. whether it is a mixed tree, 
whether there are folders designated as special folders, etc.

Phase three: restructure trees (based on policy or user decisions) in memory, 
perhaps keeping a list of actions for each node.
I imagine this phase to be undo/redo capable, i.e. allowing and advanced user 
to check "what-if" scenarios.

Phase four: copy/move/convert data, e.g. create maildir from mbox, move 
subdirectory maildir out of tree

Phase five: create necessary Akonadi resources. Necessary probably also in the 
sense to check whether some of them already exist

Phase six: synchronize the collection trees and apply collection 
settings/attributes. Map collection identifiers from/to folder identifiers for 
updating filters and application specific folder configs.
Fetch items of mbox resources and apply flags/attributes from index files.

Phase seven: optional cleanup, e.g. remove index files, dimap caches, etc.

Some things can potentially be parallelized.

Cheers,
Kevin

-- 
Kevin Krammer, KDE developer, xdg-utils developer
KDE user support, developer mentoring

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