Re: Questions, additions, and ideas.

[Sven Luther]

On Thu, Dec 30, 2004 at 03:46:56PM -0600, address@hidden wrote:
> > Sure, that is what debian-installer's partman does. I still think a proper
> > fix in libparted itself would be better though.
> I see what you mean.  That might be little tricky. :)

Well, there may be at least two ways to do it, either have libparted do the
two way writing, or fixing it for real in the kernel.

> > > As far as the "undo" command working when the interface loads we load a
> > disk
> > > struct and modify it.  See the partition table on disk has not changed so
> > if the
> > > user feels like they have made some kind of mistake and issues a "undo"
> > then we
> > > dump the current struct and reread from disk.(Because the disk has not be
> > > altered. If I am misunderstanding please correct me.
> > 
> > How do you handle stepwise undo ? you copy the in-memory structure for all
> > steps ? 
> I have not thought of that.  I will try and think of something you have any 
> ideas?

Well, coming from a functional programing background, i would say if all the
tables where pass by value one, you just would have to keep a stack of them,
and pop them when doing undo.
This is not possible in libparted's design, but you could emulate it by
keeping a stack of copied structures, maybe ? I don't see how you could do it
otherwise.

Friendly,

Sven Luther