netdev - [PATCH iproute2 v2 1/2] tests: read limited amount from /dev/urandom

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Message-Id: <1515597097-870-2-git-send-email-christian.ehrhardt@canonical.com>
Date:   Wed, 10 Jan 2018 16:11:36 +0100
From:   Christian Ehrhardt <christian.ehrhardt@...onical.com>
To:     Netdev <netdev@...r.kernel.org>
Cc:     Luca Boccassi <bluca@...ian.org>,
        Christian Ehrhardt <christian.ehrhardt@...onical.com>
Subject: [PATCH iproute2 v2 1/2] tests: read limited amount from /dev/urandom

In some test environments like e.g. Ubuntu & Debian autopkgtest it
can happen that while generating random device names the pipes
between tr and head are considered dead while processing.
That prints (non fatal) issues like:
  Running ip/link/new_link.t [iproute2-this/4.13.0-17-generic]: tr:
write error: Broken pipe
  tr: write error
  PASS

This only happens if reading an infinite amount of chars with the
read from urandom, so reading a defined amount fixes the issue.

Signed-off-by: Christian Ehrhardt <christian.ehrhardt@...onical.com>
---
 testsuite/lib/generic.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/testsuite/lib/generic.sh b/testsuite/lib/generic.sh
index b7de704..3645ff5 100644
--- a/testsuite/lib/generic.sh
+++ b/testsuite/lib/generic.sh
@@ -87,7 +87,7 @@ ts_qdisc_available()

 rand_dev()
 {
-    echo "dev-$(tr -dc "[:alpha:]" < /dev/urandom | head -c 6)"
+    echo "dev-$(head -c 250 /dev/urandom | tr -dc '[:alpha:]' | head -c 6)"
 }

 pr_failed()
-- 
2.7.4