Re: [PATCH v2] fstests: btrfs: fix 006 adds _runnt_btrfs_util_prog()

[Eryu Guan <eguan@redhat.com>]

On Thu, Jun 23, 2016 at 07:03:59PM +0800, Anand Jain wrote:
> 
> 
> On 06/23/2016 06:53 PM, Eryu Guan wrote:
[snip]
> > > diff --git a/common/rc b/common/rc
> > > index a44fb8750220..2a10fbb2d341 100644
> > > --- a/common/rc
> > > +++ b/common/rc
> > > @@ -3114,6 +3114,17 @@ _min_dio_alignment()
> > >      fi
> > >  }
> > > 
> > > +run_check_dontfail()
> > > +{
> > > +	echo "# $@" >> $seqres.full 2>&1
> > > +	"$@" >> $seqres.full 2>&1 || echo "failed: '$@'"
> > > +}
> > > +
> > > +_runnt_btrfs_util_prog()
> > > +{
> > > +	run_check_dontfail $BTRFS_UTIL_PROG $*
> > > +}
> > > +
> > >  run_check()
> > >  {
> > >  	echo "# $@" >> $seqres.full 2>&1
> > > diff --git a/tests/btrfs/006 b/tests/btrfs/006
> > > index 715fd80fb6fc..9d1fe09e07de 100755
> > > --- a/tests/btrfs/006
> > > +++ b/tests/btrfs/006
> > > @@ -79,7 +79,7 @@ echo "== Show filesystem by UUID"
> > >  $BTRFS_UTIL_PROG filesystem show $UUID | _filter_btrfs_filesystem_show $TOTAL_DEVS $UUID
> > > 
> > >  echo "== Sync filesystem"
> > > -$BTRFS_UTIL_PROG filesystem sync $SCRATCH_MNT | _filter_scratch
> > > +_runnt_btrfs_util_prog filesystem sync $SCRATCH_MNT
> > 
> > Still, I don't think this helper is necessary.
> > 
> > $BTRFS_UTIL_PROG filesystem sync $SCRATCH_MNT >/dev/null
> > 
> > doesn't _fail on failure, output error messages breaks golden image, and
> > is much simpler. Do I miss anything?
> 
>  runnt_btrfs_util_prog() checks the return status of the command,
>  if failed (!0) it will echo so to break the golden image.

So it fails silently now? (return non-zero value and print no error
message) That seems a btrfs-progs bug to me.. It should print error
messages to stderr on failure, so we don't have to check the return
value explicitly.

Thanks,
Eryu