Re: [PATCH 03/15] rebase, sequencer: remove the broken GIT_QUIET handling

> From: Elijah Newren <newren@gmail.com>
>
> The GIT_QUIET environment variable was used to signal the non-am
> backends that the rebase should perform quietly.  The preserve-merges
> backend does not make use of the quiet flag anywhere (other than to
> write out its state whenever it writes state), and this mechanism was
> broken in the conversion from shell to C.  Since this environment
> variable was specifically designed for scripts and the only backend that
> would still use it is no longer a script, just gut this code.