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Re: Delete from Repository

From: Karl Fogel <kfogel_at_google.com>
Date: 2006-09-06 00:24:19 CEST

I may be guilty of leading people on, here, sorry: I personally don't
have time to work on this, and realistically, it needs to have the
attention of some developer, or of people willing to drive the
discussion *and* provide a patch.

Again, I think it would be a great feature. I'll bet if someone out
there put up a $10k bounty for it, it would get done...


Michael Eager <eager@eagercon.com> writes:
> Karl Fogel wrote:
>> The hard part is to define exactly what it will do, see
>> http://subversion.tigris.org/issues/show_bug.cgi?id=516#desc17
>> for more on that.
>> We badly need the feature, everyone agrees -- but defining exactly
>> what the feature is is the hard part :-).
> I read the comments in the bug report.
> The feature I need is to remove a file/directory from the repo.
> It seems to me (naively) that this means removing any deltas,
> any history, any logs, etc. Make it as if the file/dir were
> never added in the first place. This would seem to address some
> of the problems mentioned: someone checks in binaries or checks
> in a source tree in the wrong location.
> Tagging a node as "obliterated" in the repo would not recover
> any wasted space, but it would logically act as if the file/dir
> had been deleted. A compress operation (i.e., dump/restore
> of the archive) would recover the space. Not as nice as recovering
> the space when the file/dir is obliterated, but it makes the
> obliterate function reversible. (The more secure variation
> is to replace the node data with a comment like "redacted" as
> mentioned in the bug report, but that makes the obliterate
> operation irreversible.) (This was Jason Robbins suggestion.)
> I'm a bit unclear about the comments that obliterating
> a file/dir would make working copies invalid. What happens
> when svn sees a entry for a file in a working copy when no
> file exists in the repo? Or better, what should happen?
> There were also comments about deltas against obliterated
> nodes. I'm unfamiliar with the internals of svn, but if there
> are deltas against a file which is obliterated, then it seems
> like all of these deltas should also be obliterated. I don't
> understand the comment about needing to "re-delta" nodes.
> It may be that there is a different requirement to obliterate
> some intermediate update, while retaining the file/dir in
> the repo. That's something different from what I would like
> to see. Some of the comments (like those of Ben Collins-Sussman)
> seem to address this problem.
> It seems that for many applications it would be satisfactory
> to take the repo offline while compressing (dump/restore) it,
> eliminating space used by obliterated files. There are comments
> that this is not a satisfactory solution for large repos, but it
> would seem to provide a stepping stone to a more comprehensive
> solution.
> That better solution might be to walk the database looking
> for obliterated nodes and then remove them and any nodes
> which reference them, recursively. (Obviously, this is done
> bottom up, removing nodes which have no references and removing
> the references to the nodes.) I'm speaking from a naive viewpoint,
> since I haven't looked at the code. This sounds to me like
> something which can be done in the background as a maintenance
> activity, without taking the repo offline.
> --
> Michael Eager eager@eagercon.com
> 1960 Park Blvd., Palo Alto, CA 94306 650-325-8077

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Received on Wed Sep 6 00:27:06 2006

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