From mboxrd@z Thu Jan  1 00:00:00 1970
MIME-Version: 1.0
Date: Wed, 20 Nov 2013 12:13:51 +0100
Message-ID: <CAJUT6o616qwHvKtrRi2Rdx98r1kTAs5ejAk1tLktaoX10HLKrQ@mail.gmail.com>
From: dexen deVries <dexen.devries@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Content-Type: text/plain; charset=ISO-8859-1
Subject: [9fans] p9p mk rc help
Topicbox-Message-UUID: 8ac26b48-ead8-11e9-9d60-3106f5b1d025

Hi list,

apologies for the keyword overload ;-)

I have a plan9port mkfile using Rc (MKSHELL=$PLAN9/bin/rc), a recipe
contains pipeline: FOO_COMMAND | BAR_COMMAND.

What is the correct way of detecting failure exit status of
FOO_COMMAND (a networked operation) and ignoring exit status of
BAR_COMMAND?
the best i came up with is very ugly:

target: prereq
    FOO_COMMAND | BAR_COMMAND
    st = $status
    if (~ $st ?* ^ '|' ^ *) {
        echo FOO_COMMAND failed
        exit 3 }

seems the | in pattern has to be quoted, otherwise is interpreted as
pipe operator.

regards,
--
dx