Copy-on-Update Feature

Ben,

We (Dan, Mike and myself) were discussing this feature yesterday and
there are some differing thoughts on what you are attempting to do.
When we get clarity, we should probably update your notes file.

Your notes file states this as the problem to solve:

  When 'svn up' receives a copy or move (copy+delete), the existing
  locally-edited file should be copied (wc -> wc). (The status quo is
  to just delete (unversion) the edited file and add a wholly new file
  -- which greatly angers users.)

Where your notes file gets confusing is about whether you only plan to
"solve this problem" in certain situations, or always. Based on IRC
conversations, I maintain that you intend to always solve the problem.
 This is my recollection:

There are two scenarios to solve:

1) User has local edits in a file. In this scenario, Subversion
never removes the file from disk, it just makes it unversioned. So
even in the scenario where Subversion deletes the file, before sending
the copy, the local file is still going to be on disk and you should
still be able to find it to copy it. Situations where you cannot
ought to be fairly rare, error conditions.

2) User has made edits on a branch. Merge moves the file, causing
the edits on the branch to be lost. Your notes file does not
specifically talk about this scenario, but I assume it is just a
variant of the same scenario. In this case, if the local file is
available we copy it, if it is not available, we have the information
we need to copy it from the server. Meaning, the branch version of
the file is first copied to the new location, and then text deltas are
applied.

I guess now that I have written this out, your doc really only talks
about svn up, and scenario 2 only applies to merge. So maybe you do
not intend to solve this one?

-- 
Thanks
Mark Phippard
http://markphip.blogspot.com/
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