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Re: svn_client_log - add copyto as partner of copyfrom?

From: Branko Čibej <brane_at_xbc.nu>
Date: 2004-05-01 21:57:49 CEST

John Peacock wrote:

> Barry Scott wrote:
>>> If you come up with a brilliant way to determine and populate that
>>> copyto info, you just let me know.
>> So its a good idea, but its hard to implement?
>> How do you populate the copy_from list? Isn't the copy_to list the same
>> problem? On a copy you have to record the copy_to info on the src
>> and copy_from in the dest.
> I think part of the issue is that copy_from is a one-to-one
> relationship (a file can only be copied from one file). copy_to,
> however, is potentially one-to-many, which complicates the storage on
> the source (since you have to track each and every copy_to). A single
> file could potentially be used as the source for every other file in
> the repository, so you'd have to have an way of storing a limitless
> number of copy_to pointers in a way that wouldn't be slow to add new
> values.

That's not so hard to do if you use indexes.

> It's also something that would mean the repository format would change
> completely,

Not "completely", but incompatibly. Adding forward pointers to the
schema is on my list for 2.0.

> plus I don't know how difficult it would be to recreate the copy_to
> list during conversion. It would require at least one extra pass
> through the data to read the copy_from's and intuit the copy_to's.

Now that's simple. If you can reproduce every copy during a dump/load,
then obviously you can populate all copy-from and copy-to data.

-- Brane

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Received on Sat May 1 21:58:23 2004

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