Re: [PATCH 2/2] filter-branch: fail gracefully when a filter fails

Johannes Schindelin [off-list ref] writes:

On Thu, 5 Jul 2007, Jeff King wrote:

quoted

status=`((cmd1; echo $? >&3) | cmd2) 3>&1`

Cute.

This is the replacement patch, then (I guess there are still some nits to 
be had, so I did not redo the proper patch yet):
...
+	(sed -e '1,/^$/d' <../commit |
+		(eval "$filter_msg" ||
+		 die "msg filter failed: $filter_msg" 2>&3) |
+		(sh -c "$filter_commit" "git commit-tree" $(git write-tree) \
+			$parentstr > ../map/$commit ||
+		 die "commit filter failed: $filter_commit" 2>&3)) 3>&1 |
+	 grep . && die

You certainly meant "grep >&2 ." at the end of that pipeline;
while I welcome people to be aware that it is possible with
esoteric shell redirection games, I personally feel this is not
worth it.