Juergen Schoenwaelder <j.schoenwael...@jacobs-university.de> wrote:
> On Thu, Jun 27, 2019 at 10:04:50PM +0200, Martin Bjorklund wrote:
> > Juergen Schoenwaelder <j.schoenwael...@jacobs-university.de> wrote:
> > > On Thu, Jun 27, 2019 at 09:52:56PM +0200, Martin Bjorklund wrote:
> > > > > Yes, good point, I think the phrase "by a different hardware
> > > > > component" should be removed. It seems last-change should change when
> > > > > I unplug a component and I plug it back shortly after, i.e., a
> > > > > component is replaced by itself. So we have:
> > > > >
> > > > > "The last time a new hardware component has been added to the
> > > > > '/hardware/component' list, or a hardware component has been
> > > > > removed from the '/hardware/component' list, or a hardware
> > > > > component in the '/hardware/component' list has been
> > > > > replaced."
> > > >
> > > > I think that this is still not clear what it means that a component
> > > > has been replaced. Do you mean "replaced by a different hardware
> > > > component"?
> > > >
> > > > Otherwise (unplug then plug in the same component), the system either
> > > > detects the removal and thus updates last-change, or it doesn't detect
> > > > the quick removal/insertion, and then it can't do anything. Thus, I
> > > > don't think this case needs special treatment, and the text could be
> > > > just:
> > > >
> > > > "The last time a new hardware component has been added to the
> > > > '/hardware/component' list, or a hardware component has been
> > > > removed from the '/hardware/component' list."
> > > >
> > >
> > > The question is whether every implementor will figure out that if the
> > > component found in some slot x-y-z is different from what is expected
> > > to be in slot x-y-z, this must be seen as a remove + add combination.
> > > If we include 'replace', then it may be clearer that even in the case
> > > where what is in slot x-y-z has changed, the last-change must be
> > > updated. (That is, the list element with the same name still exists
> > > but it is different from what was there before with the same name.)
> >
> > But then we're back to where we started - what exactly does "different
> > from what was there before" mean? Presumably that some leaf's value
> > is different...?
> >
>
> Go back some emails, I have removed the 'different' phrase.
Perhaps we can say:
[...] or a hardware
component in the '/hardware/component' list has been
replaced with a new hardware component with the same
name.
/martin
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