Re: git rebase regression: cannot pass a shell expression directly to --exec

>> A transparent optimization that tries execve() then falls back to the
>> user's shell sounds like a good idea.
>
> It does not really work that way. Git runs in a separate process that
> does not have access to your current shell. That's why you need to do
> 'export -f foo'.
>
> If you want git to be able to ecute the foo shell function, git needs to
> start a _new_ shell process, which reads the environment, recognize the
> exported function and run that.
>
> This is not the same as git executing the command in your shell. Not
> exported variables would not be available in this function (as it would
> be in your equivalent).