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Re: Would branching across repositories be theoretically possible?

From: Daniel Shahaf <danielsh_at_elego.de>
Date: Tue, 1 Jan 2013 21:52:20 +0200

Ben Reser wrote on Mon, Dec 31, 2012 at 17:41:36 -0800:
> On Mon, Dec 31, 2012 at 4:47 PM, Daniel Shahaf <danielsh_at_elego.de> wrote:
> > (This is currently not possible because svnsync assumes that it writes
> > to the repository root and assumes revnums in the src and dest
> > repositories must equal; with the change, what will have to be equal is
> > some sort of svn:sync-source-revision revprop on file://$PWD/r/llvm)
> >
> > (BTW, an obvious improvement would be to mirror only a part of the llvm
> > history --- either temporally (only N recent revisions), spatially (only
> > some subtrees), or both.)
> I've actually looked at adjusting svnsync to handle this but I just
> haven't gotten back to actually doing the work. So many things to do
> so little time. :D
> This might be a stop gap way of handling this but the better solution
> long term is what Branko was talking about with being able to svn cp
> between repos and then handle the merges.

Certainly it's possible to implement cross-repository 'svn cp' without
teaching svnsync to use non-root fspaths for destination.

> If both things are equal time or the cp/merge between repos is only
> slightly more time I'd say we shouldn't bother with the svnsync
> solution since in my opinion it pollutes the svnsync tool.

Non-root-fspath destinations are IMO a natural extension; they just
transform svnsync from "make a full copy of a versioned tree" to "make
a full copy of a versioned subtree".

I'm digressing a bit, but svnsync also needs to learn not to create
empty revisions for revisions that don't touch the synced subtree, when
the sync src is a repository subtree. (Currently a svnsync mirror of
https://svn.apache.org/repos/asf/subversion would have 1.4M revisions;
there is no good reason it should have more than 63138 revisions (that's
the "predecessor count" of the /subversion node in the /asf repository).)


Received on 2013-01-01 20:53:22 CET

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