From mboxrd@z Thu Jan  1 00:00:00 1970
From: Junio C Hamano <gitster@pobox.com>
Subject: Re: [PATCH v3 3/4] refs: make refs/worktree/* per-worktree
Date: Fri, 14 Aug 2015 10:10:20 -0700
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Cc: David Turner <dturner@twopensource.com>,
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To: Michael Haggerty <mhagger@alum.mit.edu>
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In-Reply-To: <55CDA445.9090503@alum.mit.edu> (Michael Haggerty's message of
	"Fri, 14 Aug 2015 10:18:13 +0200")
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Michael Haggerty <mhagger@alum.mit.edu> writes:

> I don't see how that can help. The result of a pipeline is taken from
> the last command. The exit codes of earlier commands in the pipeline are
> lost in the sands of time:
>
>     $ false | true
>     $ echo $?
>     0
>     $ false | ( ! false )
>     $ echo $?
>     0
>
> Working around this POSIX shell limitation is surprisingly awkward in a
> general-purpose script. But in this case you could use a temporary file:
>
>     git for-each-ref >refs-actual &&
>     ! grep refs/worktree <refs-actual && [...]

It is not just "you could", but that is what you "should" do, if you
cared the exit status from for-each-ref.

Thanks.