[darcs-users] checkpoints in darcs-2 repositories

[Eric Kow]

Warning: my understanding of this is from 2007-04 and may
(or may not) be obsolete:
  http://lists.osuosl.org/pipermail/darcs-devel/2007-April/005540.html
See David's reply too for details

On Wed, Nov 26, 2008 at 22:32:24 +1100, Trent W. Buck wrote:
>   - get --partial on a darcs-1 repo copies patches since the last
>     checkpoint.

Sounds right to me.  It copies the one big checkpoint patch, applies
it and then applies subsequent patches

>   - get --lazy on a darcs-2 repo copies *no* patches initially; all
>     patches are copied on demand.

It copies pristine files, but no patches.

>   - darcs-2 repos don't support --partial semantics, and for darcs-2
>     repos --partial is probably an alias for --lazy behaviour.

I can confirm this point (it tells you explicitly this fact)

> Does this mean that checkpoints of a darcs-2 repo are totally useless?
> If so, can we please make darcs optimize --checkpoint on a darcs-2
> repository a no-op?  Currently I have checkpoint in my ~/.darcs/defaults
> and so I'm creating around 20MB of checkpoints that (apparently) are
> never used.

Alternatively, as an optimisation we could consider making darcs 2
--lazy use checkpoints whenever they are possible.  The purpose of the
checkpoint would be to avoid fetching individual files from pristine.
But if this is not feasible or wise, then I agree that making optimize
--checkpoint a no-op is sensible.

-- 
Eric Kow <http://www.nltg.brighton.ac.uk/home/Eric.Kow>
PGP Key ID: 08AC04F9
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