migrating from svn: How to clean up history?

Hello,

I'm one of the developers of www.pyinstaller.org, a tool for bundling/packagin Python scripts and al required modules into a single executable for easy distribution. We are in the process of migrating from Subversion to git.

Our SVN-Repo contains some stuff we do not want or do not need in the git repo. How can we clean this up?

1) Useless commits e.g. tagging -> I want to remove these
2) copy or move mistakes -> I want to "correct" the copy

Example for 1): This occurs e.g. if this is done

svn cp trunk tags/v0.1 -m 'release v0.1' <<<--- this on in not needed svn rm tags/v0.1 -m 'release v0.1' svn cp trunk tags/v0.1 -m 'release v0.1'

In this case I want to completely eliminate the first commit.

Example for 2): This occurs e.g. if this is done

svn cp trunk tags/v0.1 -m 'release v0.1' svn cp trunk tags/v0.1 -m 'release v0.1' <<-- actually copies to tags/v0.1/trunk

In this case I want to change eliminate the first commit (this is he same as case 1) and rewrite commit 2 to rewrite the path.

I already did some experiments with `git filter-branch` without success. (I manage renaming the tags, though.)

Any hints how to to this clean-up?