Re: [PATCH] filter-branch: Export variable `workdir' for --commit-filter

> According to `git help filter-branch':
>
>        --commit-filter <command>
>            ...
>            You can use the _map_ convenience function in this filter,
>            and other convenience functions, too...
>            ...
>
> However, it turns out that `map' hasn't been usable because it depends
> on the variable `workdir', which is not propogated to the environment
> of the shell that runs the commit-filter <command>...