speeding up git-svn when directories are copied?

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When importing a whole repository, git-svn currently takes a _lot_ of
time. Almost all of it seems to be spent getting the full text of each
and every file when a tag or new branch is created.

If I remember correctly (but it was quite a while since I looked at
it), git-svnimport didn't ask the Subversion server for all the files;
it just noticed when the server said that a new directory was a copy
of an old directory, which makes them just as fast as any other commit
that doesn't change a gazillion files. (I've had an import running for
a few hours now, and have checked on it about a dozen times; every
single time, it was importing a new tag or branch. This suggests that
making these go as fast as regular commits would speed up the import
by more than a factor 10.)

Have you looked at doing this with git-svn? If it's not on your to-do
list, I might take a stab at it at some point. But I only speak the
copy-n-paste dialect of perl, so I'll need to find a largish block of
uninterrupted time first. :-)

-- 
Karl Hasselström, kha@xxxxxxxxxxx
      www.treskal.com/kalle
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