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A `--setup` step in `git filter-branch` makes it much easier to define the initial values of variables used in the real filters. Also sourcing/defining utility functions here instead of `--env-filter` improves performance and minimizes clogging the output in case of errors. Signed-off-by: Andreas Heiduk <asheiduk@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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