linux-kernel - RE: [PATCH V4 05/10] Tools: hv: Add an example script to retrieve dhcp state

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Date:	Wed, 5 Sep 2012 02:25:28 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	KY Srinivasan <kys@...rosoft.com>,
	Greg KH <gregkh@...uxfoundation.org>
CC:	"olaf@...fle.de" <olaf@...fle.de>,
	"thozza@...hat.com" <thozza@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"dcbw@...hat.com" <dcbw@...hat.com>,
	"apw@...onical.com" <apw@...onical.com>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"ben@...adent.org.uk" <ben@...adent.org.uk>
Subject: RE: [PATCH V4 05/10] Tools: hv: Add an example script to retrieve
 dhcp state

> -----Original Message-----
> From: devel [mailto:devel-bounces@...uxdriverproject.org] On Behalf Of KY
> Srinivasan
> Sent: Tuesday, September 04, 2012 8:29 PM
> To: Greg KH
> Cc: olaf@...fle.de; thozza@...hat.com; linux-kernel@...r.kernel.org;
> dcbw@...hat.com; apw@...onical.com; devel@...uxdriverproject.org;
> ben@...adent.org.uk
> Subject: RE: [PATCH V4 05/10] Tools: hv: Add an example script to retrieve dhcp
> state
> 
> 
> 
> > -----Original Message-----
> > From: Greg KH [mailto:gregkh@...uxfoundation.org]
> > Sent: Tuesday, September 04, 2012 8:04 PM
> > To: KY Srinivasan
> > Cc: olaf@...fle.de; thozza@...hat.com; linux-kernel@...r.kernel.org;
> > dcbw@...hat.com; apw@...onical.com; devel@...uxdriverproject.org;
> > ben@...adent.org.uk
> > Subject: Re: [PATCH V4 05/10] Tools: hv: Add an example script to retrieve dhcp
> > state
> >
> > On Tue, Sep 04, 2012 at 11:39:12PM +0000, KY Srinivasan wrote:
> > >
> > >
> > > > -----Original Message-----
> > > > From: Greg KH [mailto:gregkh@...uxfoundation.org]
> > > > Sent: Tuesday, September 04, 2012 6:59 PM
> > > > To: KY Srinivasan
> > > > Cc: linux-kernel@...r.kernel.org; devel@...uxdriverproject.org;
> > olaf@...fle.de;
> > > > apw@...onical.com; ben@...adent.org.uk; thozza@...hat.com;
> > > > dcbw@...hat.com
> > > > Subject: Re: [PATCH V4 05/10] Tools: hv: Add an example script to retrieve
> > dhcp
> > > > state
> > > >
> > > > On Tue, Sep 04, 2012 at 02:46:37PM -0700, K. Y. Srinivasan wrote:
> > > > > To keep the KVP daemon code free of distro specific details, we invoke an
> > > > > external script to retrieve the DHCP state. This is an example script that
> > > > > was used to test the KVP code. This script has to be implemented in a
> Distro
> > > > > specific fashion. For instance on distros that ship with Network Manager
> > > > enabled,
> > > > > this script can be based on NM APIs.
> > > > >
> > > > > Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> > > > > Reviewed-by: Haiyang Zhang <haiyangz@...rosoft.com>
> > > > > ---
> > > > >  tools/hv/hv_get_dhcp_info.sh |   25 +++++++++++++++++++++++++
> > > > >  1 files changed, 25 insertions(+), 0 deletions(-)
> > > > >  create mode 100755 tools/hv/hv_get_dhcp_info.sh
> > > > >
> > > > > diff --git a/tools/hv/hv_get_dhcp_info.sh
> b/tools/hv/hv_get_dhcp_info.sh
> > > > > new file mode 100755
> > > > > index 0000000..3de4587
> > > > > --- /dev/null
> > > > > +++ b/tools/hv/hv_get_dhcp_info.sh
> > > > > @@ -0,0 +1,25 @@
> > > > > +#!/bin/bash
> > > > > +
> > > > > +# This example script retrieves the DHCP state of a given interface.
> > > > > +# In the interest of keeping the KVP daemon code free of distro specific
> > > > > +# information; the kvp daemon code invokes this external script to
> gather
> > > > > +# DHCP setting for the specific interface.
> > > > > +#
> > > > > +# Input: Name of the interface
> > > > > +#
> > > > > +# Output: The script prints the string "Enabled" to stdout to indicate
> > > > > +#	that DHCP is enabled on the interface.
> > > >
> > > > What happens if DHCP is not enabled on the interface?  Shouldn't that
> > > > also return something other than "success"?
> > >
> > > The script is expected to write "Enabled" to stdout to indicate if DHCP is
> > enabled; if this
> > > is not the case, implicitly we assume DHCP is not enabled (since this is a binary
> > state).
> >
> > It's not really "binary" given that you are expecting "Enabled" or
> > nothing, right?  "Disabled" would make a bit more sense perhaps?
> 
> In the KVP daemon code, I currently only check for "Enabled" to see if
> DHCP is enabled.
> 
> >
> > Having a script return "nothing at all" to show the failure of a state
> > doesn't seem the wisest thing, does it?
> 
> I can certainly resubmit this patch with the change you are suggesting. This patch
> adds a new file
> and does not impact any of the other patches that follows this. Would you want
> me to resubmit all of the
> remaining patches starting with this one.

I have resent this patch with the change you have suggested. Since this patch is a 
standalone patch I have not resent the other patches that follow this patch. Let me
know if you want me to resend the remaining patches.

Regards,

K. Y 
> _______________________________________________
> devel mailing list
> devel@...uxdriverproject.org
> http://driverdev.linuxdriverproject.org/mailman/listinfo/devel
> 
> 

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