linux-kernel - Re: [PATCH v3 13/14] tracing/selftest: Add selftests to test trace

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Date:   Mon, 28 May 2018 21:20:55 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tom Zanussi <tom.zanussi@...ux.intel.com>,
        Clark Williams <williams@...hat.com>,
        Karim Yaghmour <karim.yaghmour@...rsys.com>,
        Brendan Gregg <bgregg@...flix.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Yann Ylavic <ylavic.dev@...il.com>,
        linux-rt-users@...r.kernel.org, Shuah Khan <shuahkhan@...il.com>
Subject: Re: [PATCH v3 13/14] tracing/selftest: Add selftests to test
 trace_marker histogram triggers

On Mon, 28 May 2018 01:32:58 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> Hi Steve,
> 
> On Fri, 25 May 2018 17:13:53 -0400
> Steven Rostedt <rostedt@...dmis.org> wrote:
> 
> > On Fri, 25 May 2018 17:12:29 -0400
> > Steven Rostedt <rostedt@...dmis.org> wrote:
> > 
> >    
> > > #!/bin/sh  
> > 
> > Hmm, I think I need to make this #!/bin/bash
> >   
> > > test_trace() {
> > >     file=$1
> > >     x=$2
> > > 
> > >     cat $file | while read line; do
> > > 	if [ "$line" != "${line/\#/}" ]; then
> > > 	    continue
> > > 	fi
> > > 	echo "testing $line for >$x<"
> > > 	if [ "$line" == "${line/>$x</}" ]; then  
> > 
> > The ${line/>$x</} is unique to bash I believe.  
> 
> Hmm, could you try to use only posix-shell based test ?
> Since I would like to keep this can run on small 
> environment, like busybox, etc.
>

Like something like this?

-- Steve

diff --git a/tools/testing/selftests/ftrace/test.d/trigger/trigger-trace-marker-snapshot.tc b/tools/testing/selftests/ftrace/test.d/trigger/trigger-trace-marker-snapshot.tc
index c6c50a2..3a3c33d 100644
--- a/tools/testing/selftests/ftrace/test.d/trigger/trigger-trace-marker-snapshot.tc
+++ b/tools/testing/selftests/ftrace/test.d/trigger/trigger-trace-marker-snapshot.tc
@@ -41,11 +41,13 @@ test_trace() {
     x=$2
 
     cat $file | while read line; do
-	if [ "$line" != "${line/\#/}" ]; then
+	comment=`echo $line | sed -e 's/^#//'`
+	if [ "$line" != "$comment" ]; then
 	    continue
 	fi
 	echo "testing $line for >$x<"
-	if [ "$line" == "${line/>$x</}" ]; then
+	match=`echo $line | sed -e "s/>$x<//"`
+	if [ "$line" == "$match" ]; then
 	    fail "$line does not have >$x< in it"
 	fi
 	let x=$x+2