linux-kernel - [PATCH] selftests/ftrace: Handle the absence of tput

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Message-Id: <20190220153706.24686-1-juergh@canonical.com>
Date:   Wed, 20 Feb 2019 16:37:06 +0100
From:   Juerg Haefliger <juerg.haefliger@...onical.com>
To:     linux-kernel@...r.kernel.org, rostedt@...dmis.org, mingo@...hat.com
Cc:     Juerg Haefliger <juergh@...onical.com>
Subject: [PATCH] selftests/ftrace: Handle the absence of tput

In environments where tput is not availbale, we get the following
error
$ ./ftracetest: 163: [: Illegal number:
because ncolors is an empty string. Fix that by setting it to 0 if the
tput command fails.

Signed-off-by: Juerg Haefliger <juergh@...onical.com>
---
 tools/testing/selftests/ftrace/ftracetest | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/ftrace/ftracetest b/tools/testing/selftests/ftrace/ftracetest
index 75244db70331..fc755e1b50f1 100755
--- a/tools/testing/selftests/ftrace/ftracetest
+++ b/tools/testing/selftests/ftrace/ftracetest
@@ -154,13 +154,13 @@ fi
 
 # Define text colors
 # Check available colors on the terminal, if any
-ncolors=`tput colors 2>/dev/null`
+ncolors=`tput colors 2>/dev/null || echo 0`
 color_reset=
 color_red=
 color_green=
 color_blue=
 # If stdout exists and number of colors is eight or more, use them
-if [ -t 1 -a "$ncolors" -a "$ncolors" -ge 8 ]; then
+if [ -t 1 -a "$ncolors" -ge 8 ]; then
   color_reset="\e[0m"
   color_red="\e[31m"
   color_green="\e[32m"
-- 
2.19.1