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Re: Moves in FSFS

From: Branko Čibej <brane_at_wandisco.com>
Date: Wed, 11 Sep 2013 20:32:28 +0200

On 11.09.2013 20:09, Julian Foad wrote:
>> Proposal: Resurrect keeping the old node-line IDs, iff
>> (a) the copy source (or a parent) got deleted in the next revision
>> (b) no copies of that node (or any parent) were added since the source rev.
>> That should keep normal copying relatively cheap and still provide the
>> special behavior for our "undo" use-case.
> I think you mean that the user-level copy should do this automatically. Perhaps so. That need not be implemented in the FS layer; the FS layer could just provide the primitives necessary to implement it.

This actually breaks the semantics of "copy" for no readily apparent
reason. It's much more interesting IMO to consider how such a concept
would be presented in the UI.

I'll just note that resurrecting deleted nodes is orthogonal to the
issue of move tracking. It's moderately easily done in the current
top-down DAG model, since "delete" simply means "remove edge from
graph"; and it's also provided for in the metadata-ng design.

-- 
Branko Čibej | Director of Subversion
WANdisco // Non-Stop Data
e. brane_at_wandisco.com
Received on 2013-09-11 20:33:06 CEST

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