Re: [PATCH v2 1/5] common: re-enable tests that require scratch dev on NFS

[Dave Chinner <david@fromorbit.com>]

On Wed, Nov 12, 2014 at 12:36:13PM -0600, Steve French wrote:
> On Fri, Oct 31, 2014 at 12:03 PM, Eryu Guan <eguan@redhat.com> wrote:
> > This commit disables tests requires scratch dev running on NFS
> >
> > c041421 xfstests: stop special casing nfs and udf
> >
> > Now re-enable them to get a larger test coverage on NFS.
> >
> > Signed-off-by: Eryu Guan <eguan@redhat.com>
> > ---
> >  common/rc | 22 +++++++++++++++++++---
> >  1 file changed, 19 insertions(+), 3 deletions(-)
> >
> > diff --git a/common/rc b/common/rc
> > index 747cf72..ae03712 100644
> > --- a/common/rc
> > +++ b/common/rc
> > @@ -551,6 +551,14 @@ _mkfs_dev()
> >      rm -f $tmp_dir.mkfserr $tmp_dir.mkfsstd
> >  }
> >
> > +# remove all files in $SCRATCH_MNT, useful when testing on NFS/CIFS
> > +_scratch_cleanup_files()
> > +{
> > +       _scratch_mount
> > +       rm -rf $SCRATCH_MNT/*
> > +       _scratch_unmount
> > +}
>
> There should be a check to make sure SCRATCH_MNT exists before you
> wipe the whole disk ....
> 
> so if no SCRATCH_MNT then this does rm -rf/*
> right ... (and wipes out your whole system ...)

You can't get to that function until after all the checks that
SCRATCH_MNT exists. i.e. this happens during _scratch_mkfs, and that
is only called in tests after all the startup checks validate
devices and mounts exist. i.e. see common/config::get_next_config()

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com