linux-kernel - Re: [PATCH 4/4] selftests: ftrace: Output only to console with "--logdir -"

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Date:   Wed, 5 Jul 2017 12:25:06 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     linux-kselftest@...r.kernel.org, shuah@...nel.org,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        naresh.kamboju@...aro.org
Subject: Re: [PATCH 4/4] selftests: ftrace: Output only to console with
 "--logdir -"

On Tue,  4 Jul 2017 15:38:55 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> Output logs only to console if "-" is given to --logdir
> option. In this case, ftracetest doesn't record any log
> on the disk, and all logs immediately shown (including
> all command logs.) Since there is no "tee" in the middle
> of command and console, it outputs the log really soon.
> 
> This option is useful only when the console is logged.
> 
> Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> ---
>  tools/testing/selftests/ftrace/ftracetest |   29 +++++++++++++++++++++--------
>  1 file changed, 21 insertions(+), 8 deletions(-)
> 
> diff --git a/tools/testing/selftests/ftrace/ftracetest b/tools/testing/selftests/ftrace/ftracetest
> index 892ca4e..25792ee 100755
> --- a/tools/testing/selftests/ftrace/ftracetest
> +++ b/tools/testing/selftests/ftrace/ftracetest
> @@ -19,6 +19,7 @@ echo "		-vvv       Alias of -v -v -v (Show all commands immediately)"
>  echo "		--fail-unsupported Treat UNSUPPORTED as a failure"
>  echo "		-d|--debug Debug mode (trace all shell commands)"
>  echo "		-l|--logdir <dir> Save logs on the <dir>"
> +echo "		            If <dir> is -, all logs output in console only"
>  exit $1
>  }
>  
> @@ -127,14 +128,20 @@ if [ -z "$TRACING_DIR" -o ! -d "$TRACING_DIR" ]; then
>  fi
>  
>  # Preparing logs
> -LOG_FILE=$LOG_DIR/ftracetest.log
> -mkdir -p $LOG_DIR || errexit "Failed to make a log directory: $LOG_DIR"
> -date > $LOG_FILE
> +if [ "x$LOG_DIR" = "x-" ]; then
> +  LOG_FILE=
> +  date
> +else
> +  LOG_FILE=$LOG_DIR/ftracetest.log
> +  mkdir -p $LOG_DIR || errexit "Failed to make a log directory: $LOG_DIR"
> +  date > $LOG_FILE
> +fi
> +
>  prlog() { # messages
> -  echo "$@" | tee -a $LOG_FILE
> +  [ -z "$LOG_FILE" ] && echo "$@" || echo "$@" | tee -a $LOG_FILE
>  }
>  catlog() { #file
> -  cat $1 | tee -a $LOG_FILE
> +  [ -z "$LOG_FILE" ] && cat $1 || cat $1 | tee -a $LOG_FILE
>  }
>  prlog "=== Ftrace unit tests ==="
>  
> @@ -255,12 +262,18 @@ __run_test() { # testfile
>  # Run one test case
>  run_test() { # testfile
>    local testname=`basename $1`
> -  local testlog=`mktemp $LOG_DIR/${testname}-log.XXXXXX`
> +  if [ "$LOG_FILE" ] ; then

Shouldn't this be

	if [ ! -z "$LOG_FILE" ]; then

?

> +    local testlog=`mktemp $LOG_DIR/${testname}-log.XXXXXX`
> +  else
> +    local testlog=`/proc/self/fd/1`

cute trick.

> +  fi
>    export TMPDIR=`mktemp -d /tmp/ftracetest-dir.XXXXXX`
>    testcase $1
>    echo "execute$INSTANCE: "$1 > $testlog
>    SIG_RESULT=0
> -  if [ $VERBOSE -ge 3 ]; then
> +  if [ -z "$LOG_FILE" ]; then
> +    __run_test $1 2>&1
> +  elif [ $VERBOSE -ge 3 ]; then
>      __run_test $1 | tee -a $testlog 2>&1
>    elif [ $VERBOSE -eq 2 ]; then
>      __run_test $1 2>> $testlog | tee -a $testlog
> @@ -270,7 +283,7 @@ run_test() { # testfile
>    eval_result $SIG_RESULT
>    if [ $? -eq 0 ]; then
>      # Remove test log if the test was done as it was expected.
> -    [ $KEEP_LOG -eq 0 ] && rm $testlog
> +    [ $KEEP_LOG -eq 0 -a "$LOG_FILE" ] && rm $testlog

again, don't we need to test "$LOG_FILE"?

-- Steve

>    else
>      [ $VERBOSE -eq 1 -o $VERBOSE -eq 2 ] && catlog $testlog
>      TOTAL_RESULT=1