Re: [RFC] "Remote helper for Subversion" project

On Sun, Mar 4, 2012 at 6:54 PM, Jonathan Nieder [off-list ref] wrote:

David Barr wrote:

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On Sat, Mar 3, 2012 at 11:27 PM, David Barr [off-list ref] wrote:

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--- a/SoC-2012-Ideas.md
+++ b/SoC-2012-Ideas.md

@@ -182,3 +182,29 @@ this project.

 Proposed by: Thomas Rast
 Possible mentor(s): Thomas Rast
+
+Remote helper for Subversion
+------------------------------------
+
+Write a remote helper for Subversion. While a lot of the underlying
+infrastructure work was completed last year, the remote helper itself
+is essentially incomplete. Major work includes:

By the way, didn't we have a remote-svn prototype?  I'm happy to merge
any old hacky thing for staging in contrib/svn-fe, as long as it is
not documented in a misleading way.

(More generally, if anyone wants to resend useful svn-fe patches, that
will help a lot.)

Found at former SoC2011Projects wiki page:
(http://git.wiki.kernel.org/articles/s/o/c/SoC2011Projects_b1f9.html#Remote_helper_for_Subversion_and_git-svn)
[vcs-svn, svn-fe: add a couple of
options](http://thread.gmane.org/gmane.comp.version-control.git/176578)
[remote-svn-alpha
updates](http://thread.gmane.org/gmane.comp.version-control.git/176617)

The introduction should be rephrased to include Dmitry's progression.

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+* Understanding revision mapping and building a revision-commit mapper.

Does this mean creating commit notes to record which subversion rev
corresponds to each commit, and marks or lightweight tags going the
other way?

Yes. I think once again, Dmitry produced a good prototype for this component.
However, I think it also potentially incorporates git-svn style
slicing of history.
That's a significant chunk of work.

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+* Working through transport and fast-import related plumbing, changing
+  whatever is necessary.

I think Dmitry and Sverre took care of most of this.

Ditto.

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+* Getting an Git-to-SVN converter merged.

Probably could fill a summer in itself.  In previous starts I think
there was some complexity creep. :/

 http://thread.gmane.org/gmane.comp.version-control.git/170290
 http://thread.gmane.org/gmane.comp.version-control.git/170551

This is my preferred focus, and is a sufficient project in its own right.

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+* Building the remote helper itself.
+
+Goal: Build a full-featured bi-directional `git-remote-svn` and get it
+      merged into upstream Git.

Sure would be neat. ;-)  Another nice piece to build would be branch
tracking / follow_parent heuristics.

As noted earlier, the remote helper itself is now half-complete.
I do think the immediate goal should be bi-direction.
The remainder is porting git-svn logic to the new helper.
However, it would be interesting to see what's missing with respect to porting

--
David Barr