Re: Adventurous yet Safety-Minded

[yersinia <yersinia.spiros@xxxxxxxxx>]

On Wed, Mar 10, 2010 at 1:54 PM, Alexander Kahl <e-user@xxxxxxxx> wrote:

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On 03/10/2010 01:06 PM, Steven I Usdansky wrote:

There is no real recovery for traditional package systems as each change
on a package (install, update, remove etc.) changes the state of the
system as a whole, i.e. the system relies on side effects (mostly
writing files into shared/global locations) and provides no referential
transparency for such actions, same output for same input is never
guaranteed.

My (silly perhaps) personal opinion that the rollback part of a package management system depends very much on QA which are made the same packages in first place. The way you write  seems that the problem is insoluble for a package manager: if so it did seem strange that several rpm developers have lost so time to implement it in the first place and to extend it over time.  But I think this has already been discussed in the past, many time. For example http://lists.rpm.org/pipermail/rpm-maint/2008-February/001912.html

and

http://lists.rpm.org/pipermail/rpm-list/2009-April/000227.html

http://lists.rpm.org/pipermail/rpm-list/2009-April/000231.html
 
But the problem is always relevant
http://www.mancoosi.org/work/#wp3

Regards

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