Re: [PATCH] Parse commandline in grub-xen

[Andrei Borzenkov <arvidjaar@gmail.com>]

В Mon, 11 May 2015 14:55:34 +0200
"Vladimir 'phcoder' Serbinenko" <phcoder@gmail.com> пишет:

> On May 11, 2015 2:04 PM, "Andrei Borzenkov" <arvidjaar@gmail.com> wrote:
> >
> > В Mon, 11 May 2015 13:51:48 +0200
> > Olaf Hering <olaf@aepfle.de> пишет:
> >
> > > On Mon, May 11, Vladimir 'phcoder' Serbinenko wrote:
> > >
> > > >
> > > > On May 11, 2015 1:23 PM, "Olaf Hering" <olaf@aepfle.de> wrote:
> > > > >
> > > > > On Mon, May 11, Vladimir 'phcoder' Serbinenko wrote:
> > > > >
> > > > > > Do you really own all those installs to be able to speak on
> behalf of all
> > > > of
> > > > > > them?
> > > > >
> > > > > Since there is zero upstream support for anything regarding grub xen
> > > > > distros are forced to provide their own grub-xen binary for dom0.
> This
> > > > > includes at least some script to do something useful within the very
> > > > > first grub-xen. So in this sense its up to whoever creates such dom0
> > > > > binary to handle variables as needed, and document the implemented
> > > > > features.
> > > > >
> > > > And your point is?
> > >
> > > That this patch gets in as is?
> > >
> > > How do you envison a way to select a boot device, or set debug=all or
> > > whatever a script may interpret?
> >
> > Either by allowing ${grub.arg.XXX} (not sure if current grammar accepts
> > it) or by adding getarg command, something like
> >
> I prefer the former. But probably fwarg. Would be a better prefix. This way
> one can do:
> extra="grub.root=xvda1"
> And then get it as fwarg.grub.root whereas root for Linux would be
> fwarg.root and thus avoiding any conflict

Using it as variable name means change to parser with possible side
effects; also it means it will go into core for every platform, even if
platform itself does not support such variable passing, increasing its
size. Having it as external command does not require any core changes,
will be used only when needed and could be modeled after getopt e.g.
allowing loop over arguments.

> > getarg --name debug --set debug
> >
> > You do not control what arguments grub gets - end use (admin) controls
> > it. You cannot force end user to actually strictly comply with what you
> > expect. As example, grub.cfg you recently submitted has
> >
> > if [ -n "hddev" ]
> >
> > without initializing it first. So administrator setting this variable
> > will unintentionally change behavior of script.
> >
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