From: Jeff King <peff@peff.net>
To: vi0oss <vi0oss@gmail.com>
Cc: Stefan Beller <sbeller@google.com>,
"git@vger.kernel.org" <git@vger.kernel.org>,
Stefan Beller <stefanbeller@gmail.com>
Subject: Re: [PATCH] submodule--helper: set alternateLocation for cloned submodules
Date: Thu, 8 Dec 2016 13:53:27 -0500 [thread overview]
Message-ID: <20161208185326.osknwhc654sqaq3t@sigill.intra.peff.net> (raw)
In-Reply-To: <d445a6c3-5375-22cf-4f03-1717559f1157@gmail.com>
On Thu, Dec 08, 2016 at 09:04:46PM +0300, vi0oss wrote:
> Why Git test use &&-chains instead of proper "set -e"?
Because "set -e" comes with all kinds of confusing corner cases. Using
&& chains is annoying, but rarely surprising.
One of my favorite examples is:
set -e
(
false
echo 1
) || {
echo outcome=$?
false
}
echo 2
which prints both "1" and "2".
Inside the subshell, "set -e" has no effect, and you cannot re-enable it
by setting "-e" (it's suppressed entirely because we are on the
left-hand side of an || conditional).
So you could write a function like this:
foo() {
do_one
do_two
}
that relies on catching the failure from do_one. And it works here:
set -e
foo
but not here:
set -e
if foo then
do_something
fi
And there's no way to make it work without adding back in the
&&-chaining.
-Peff
next prev parent reply other threads:[~2016-12-08 18:53 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-08 0:39 [PATCH] submodule--helper: set alternateLocation for cloned submodules vi0oss
2016-12-08 1:22 ` Stefan Beller
2016-12-08 17:46 ` Jeff King
2016-12-08 18:04 ` Stefan Beller
2016-12-08 18:04 ` vi0oss
2016-12-08 18:21 ` Stefan Beller
2016-12-08 18:53 ` Jeff King [this message]
-- strict thread matches above, loose matches on Subject: below --
2016-12-12 2:45 vi0oss
2016-12-08 1:38 vi0oss
2016-12-10 13:41 ` vi0oss
2016-12-12 5:35 ` Stefan Beller
2016-12-12 18:00 ` Junio C Hamano
2016-12-07 18:42 vi0oss
2016-12-07 20:09 ` Stefan Beller
2016-12-07 20:18 ` Junio C Hamano
2016-12-07 20:26 ` Stefan Beller
2016-12-07 20:28 ` Junio C Hamano
2016-12-07 21:24 ` vi0oss
2016-12-07 22:09 ` Stefan Beller
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