linux-kernel - [PATCH] sefltests/ftrace: Use /bin/echo for output with options

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Message-Id: <154350406317.4422.7595059658374071660.stgit@devbox>
Date:   Fri, 30 Nov 2018 00:07:43 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     linux-kselftest@...r.kernel.org, shuah@...nel.org,
        Steven Rostedt <rostedt@...dmis.org>
Cc:     mhiramat@...nel.org, Tom Zanussi <zanussi@...nel.org>,
        linux-kernel@...r.kernel.org,
        Daniel Díaz <daniel.diaz@...aro.org>
Subject: [PATCH] sefltests/ftrace: Use /bin/echo for output with options

Use /bin/echo for console output with options like non
newline (-n) and/or backslash escape (-e).

Tom Zanussi reported that when he tested ftracetest, it
shows "-e" and "-n" options on the console, since a system
which uses dash as the alias of /bin/sh, uses dash built-in
echo command which doesn't accept "-e".

To avoid this issue, use /bin/echo instead of echo for
the output with options.

Fixes: 8f381ac4d321 ("selftests/ftrace: Add color to the PASS / FAIL results")
Link: http://lkml.kernel.org/r/cover.1542221862.git.tom.zanussi@linux.intel.com
Reported-by: Tom Zanussi <zanussi@...nel.org>
Suggested-by: Tom Zanussi <zanussi@...nel.org>
Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
---
 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..ba670b452bdb 100755
--- a/tools/testing/selftests/ftrace/ftracetest
+++ b/tools/testing/selftests/ftrace/ftracetest
@@ -173,8 +173,8 @@ strip_esc() {
 }
 
 prlog() { # messages
-  echo -e "$@"
-  [ "$LOG_FILE" ] && echo -e "$@" | strip_esc >> $LOG_FILE
+  /bin/echo -e "$@"
+  [ "$LOG_FILE" ] && /bin/echo -e "$@" | strip_esc >> $LOG_FILE
 }
 catlog() { #file
   cat $1