linux-kernel - Re: [PATCH] ftrace/selftests: Add softlink to latest log directory

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Date:   Mon, 11 Sep 2023 09:21:05 +0900
From:   Masami Hiramatsu (Google) <mhiramat@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Linux Trace Kernel <linux-trace-kernel@...r.kernel.org>,
        linux-kselftest@...r.kernel.org, Shuah Khan <shuah@...nel.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH] ftrace/selftests: Add softlink to latest log directory

On Fri, 8 Sep 2023 18:17:21 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> From: Steven Rostedt (Google) <rostedt@...dmis.org>
> 
> When I'm debugging something with the ftrace selftests and need to look at
> the logs, it becomes tedious that I need to do the following:
> 
>  ls -ltr logs
>  [ copy the last directory ]
>  ls logs/<paste-last-dir>
> 
> to see where the logs are.
> 
> Instead, do the common practice of having a "latest" softlink to the last
> run selftest. This way after running the selftest I only need to do:
> 
>  ls logs/latest/
> 
> and it will always give me the directory of the last run selftest logs!
> 

Nice! I like this and this looks good to me.

Acked-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>

Thank you!

> Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
> ---
> 
> diff --git a/tools/testing/selftests/ftrace/ftracetest b/tools/testing/selftests/ftrace/ftracetest
> index cb5f18c06593..7df8baa0f98f 100755
> --- a/tools/testing/selftests/ftrace/ftracetest
> +++ b/tools/testing/selftests/ftrace/ftracetest
> @@ -124,6 +124,7 @@ parse_opts() { # opts
>      ;;
>      --logdir|-l)
>        LOG_DIR=$2
> +      LINK_PTR=
>        shift 2
>      ;;
>      *.tc)
> @@ -181,7 +182,10 @@ fi
>  TOP_DIR=`absdir $0`
>  TEST_DIR=$TOP_DIR/test.d
>  TEST_CASES=`find_testcases $TEST_DIR`
> -LOG_DIR=$TOP_DIR/logs/`date +%Y%m%d-%H%M%S`/
> +LOG_TOP_DIR=$TOP_DIR/logs
> +LOG_DATE=`date +%Y%m%d-%H%M%S`
> +LOG_DIR=$LOG_TOP_DIR/$LOG_DATE/
> +LINK_PTR=$LOG_TOP_DIR/latest
>  KEEP_LOG=0
>  KTAP=0
>  DEBUG=0
> @@ -207,6 +211,10 @@ else
>    LOG_FILE=$LOG_DIR/ftracetest.log
>    mkdir -p $LOG_DIR || errexit "Failed to make a log directory: $LOG_DIR"
>    date > $LOG_FILE
> +  if [ "x-$LINK_PTR" != "x-" ]; then
> +    unlink $LINK_PTR
> +    ln -fs $LOG_DATE $LINK_PTR
> +  fi
>  fi
>  
>  # Define text colors


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>