Re: VCS comparison table

Dear diary, on Wed, Oct 18, 2006 at 02:38:37AM CEST, I got a letter
where Aaron Bentley [off-list ref] said that...

Petr Baudis wrote:

quoted

quoted

this only makes sense if
you have a fast access to the repository (otherwise, you consider your
local repository as a cache, and you're ready to pay the disk space
price to save your bandwidth). In this case, it's often in your
filesystem (local or NFS).

So how is the light checkout actually implemented? Do you grab the
complete new snapshot each time the remote repository is updated?

No, the lightweight checkouts store very little.  They have
- a copy of tree shape (filenames, paths, sha1 sums) from the last
  commit.
- a copy of tree shape for the current working directory
- a map from stat values to sha-1 hashes

I see, I guess that means "the index file and tree objects for the last
commit" in git-speak. Thanks.

quoted

Do all
the (at least read-only, like "log" and "diff", perhaps "status")
commands work on such a light checkout?

Yes.  And if you check out from a read-write branch, all write commands,
work, too.

Ok, one last question - do you do most of the work locally, fetching
bits of data as you need, or remotely, only taking input/producing
output over the network (the pserver model)?

-- 
				Petr "Pasky" Baudis
Stuff: http://pasky.or.cz/
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