Eric Kidd authored Feb 11, 2009 and Junio C Hamano committed Feb 11, 2009

9273b562 (filter-branch: Fix fatal error on bare repositories, 2009-02-03)
fixed a missing check of return status from an underlying command in
git-filter-branch, but there still are places that do not check errors.
For example, the command does not pay attention to the exit status of the
command given by --commit-filter.  It should abort in such a case.

This attempts to fix all the remaining places that fails to checks errors.

In two places, I've had to break apart pipelines in order to check the
error code for the first stage of the pipeline, as discussed here:

  http://kerneltrap.org/mailarchive/git/2009/1/28/4835614



Feedback on this patch was provided by Johannes Sixt, Johannes Schindelin
and Junio C Hamano.  Thomas Rast helped with pipeline error handling.

Signed-off-by: Eric Kidd <git@randomhacks.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>