Date:	Tue, 25 Sep 2012 19:48:30 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	Steven Rostedt <srostedt@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: ktest.pl always returns 0?

On Tue, 2012-09-25 at 16:33 -0400, Steven Rostedt wrote:
> On Tue, 2012-09-25 at 12:40 -0700, Greg KH wrote:
> 
> > Hey, it's not my fault your employer has a crummy email system that
> > can't handle remote access well, I just went off of the Author: line in
> > your ktest.pl kernel commits :)
> 
> Yeah, I'm not upset by it. I just want to warn people that there's times
> I may spend long periods of not answering that email.
> 
> > 
> > > > I'm trying to use ktest to do build tests of the stable patch series to
> > > > verify I didn't mess anything up, but I'm finding that ktest always
> > > > returns 0 when finished, no matter if the build test was successful or
> > > > failed.
> > > 
> > > Hmm, I should fix that. Yeah, I agree, if it fails a test it should
> > > return something other than zero. But I think that only happens if you
> > > have DIE_ON_FAILURE = 0. As IIRC, the perl "die" command should exit the
> > > application with an error code.
> > > 
> > > But yeah, I agree, if one of the tests fail, the error code should not
> > > be zero. I'll write up a patch to fix that. Or at least add an option to
> > > make that happen.
> > 
> > That would be great.
> > 
> > > > Is this right?  Is there some other way to determine if ktest fails
> > > > other than greping the output log?
> > > 
> > > If you have DIE_ON_FAILURE = 1 (default) it should exit with non zero.
> > 
> > It doesn't do that, test it and see (this is with what is in Linus's
> > 3.6-rc7 tree, I didn't test linux-next if that is newer, my apologies.)
> 
> This should have been something from day one. I'll go ahead and try it
> out. According to the perl-doc man pages the "die" command has:
> 
>            If an uncaught exception results in interpreter exit, the exit
>            code is determined from the values of $! and $? with this
>            pseudocode:
> 
>                exit $! if $!;              # errno
>                exit $? >> 8 if $? >> 8;    # child exit status
>                exit 255;                   # last resort
> 
> I'll investigate this further.
> 
> > 
> > > > Oh, and any hints on kicking off a ktest process on a remote machine in
> > > > a "simple" way?  I'm just using ssh to copy over a script that runs
> > > > there, wrapping ktest.pl up with other stuff, I didn't miss the fact
> > > > that ktest itself can run remotely already, did I?
> > > 
> > > I'm a little confused by this question. Do you want a server ktest? That
> > > is, have a ktest daemon that listens for clients that sends it config
> > > files and then runs them? That would actually be a fun project ;-)
> > > 
> > > You're not running ktest on the target machine are you? The way I use it
> > > is the following:
> > > 
> > > I have a server that I ssh to and run ktest from. It does all the builds
> > > there on the server and this server has a means to monitor some target.
> > > I use ttywatch that connects to the serial of the target, in which ktest
> > > uses to read from.
> > > 
> > > Sometimes this "server" is the machine I'm logged in to.  And I just run
> > > ktest directly.
> > > 
> > > Can you explain more of what you are looking for?
> > 
> > I want to be able to say:
> > 	- take this set of stable patches and go run a 'make
> > 	  allmodconfig' build on a remote machine and email me back the
> > 	  answer because I might not be able to keep an internet
> > 	  connection open for the next 5-15 minutes it might take to
> > 	  complete that task.
> 
> I cheat and run all my ktests in screen sessions ;-)
> 
> > 
> > I don't do boot tests with these kernel build tests, although sometime
> > in the future it would be nice to do that.  Right now I do that testing
> > manually, as it's pretty infrequent (once per release usually.)
> > 
> > So yes, a 'ktest' server would be nice.  I've attached the (horrible)
> > script below that I'm using for this so far.  It seems to work well, and
> > I can do builds on a "cloud" server as well as my local build server
> > just fine, only thing needed to do is change the user and machine name
> > in the script.
> 
> This looks like my next "when I have time" project ;-).
> 
> 
> > 
> > I know ktest doesn't handle quilt patches yet, which is why I apply them
> > "by hand" now to a given git tree branch, if you ever do add that
> > option, I'll gladly test it out and change my script to use whatever
> > format it needs.
> > 
> 
> Yeah, I need to make ktest work with quilt, as I'm still a fan.
> 
> But currently the ones that pay me actually are giving me things to do.
> Something about satisfying customers or some other crap. Thus, my "down
> time" is limited at the moment :-(  But when things on the customer side
> slows down again, I'll definitely work on these changes.
> 
> Thanks for the ideas! I'm actually looking forward to working on this.
> But in the mean time, I will test the next time ktest fails on me to see
> what the result of $? is.
> 

I just forced a build failure to see what ktest would show. This is my
result:

cp /home/rostedt/work/git/configs/ixf/config-use /home/rostedt/work/git/nobackup/ixf/trace/.config ... SUCCESS
touch /home/rostedt/work/git/nobackup/ixf/trace/.config ... SUCCESS
Applying minimum configurations into /home/rostedt/work/git/nobackup/ixf/trace/.config.new
mv /home/rostedt/work/git/nobackup/ixf/trace/.config.new /home/rostedt/work/git/nobackup/ixf/trace/.config ... SUCCESS
GCC_VERSION=4.6.0 distmake-64 O=/home/rostedt/work/git/nobackup/ixf/trace oldnoconfig ... SUCCESS
GCC_VERSION=4.6.0 distmake-64 O=/home/rostedt/work/git/nobackup/ixf/trace -j40 ... FAILED!
CRITICAL FAILURE... failed build
 See /home/rostedt/work/git/nobackup/ixf/ixf.log for more info.
failed build
[rostedt@...ora git]$ echo $?
25


So it seems that if DIE_ON_FAILURE is set, it returns non-zero error.
But if it doesn't then it wont. But for that, I have this patch:


--- ktest.pl.orig	2012-09-25 19:43:08.608524543 -0400
+++ ktest.pl	2012-09-25 19:46:21.795560499 -0400
@@ -3709,4 +3709,5 @@
 
 doprint "\n    $successes of $opt{NUM_TESTS} tests were successful\n\n";
 
-exit 0;
+# Return number of failures (Yeah if we had 256 tests fail this breaks)
+exit $opt{NUM_TESTS} - $successes


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