[packagekit] Adding support for "prepare" in transaction_flags

[Sebastian Heinlein]

Am Montag, den 04.06.2012, 18:14 +0200 schrieb Anders F Björklund: 
> Richard Hughes wrote:
> 
> > On 3 June 2012 19:36, Daniel Nicoletti <dantti12 at gmail.com> wrote:
> >> Ok, it's just that for apt it would mean download only...
> > 
> > Same for yum and zif, so you might have a point. Would anybody else do
> > anything else except download? What about a source distro that needs
> > to download, make but *not* sudo make install?
> 
> For a source distribution, you will still have to install the build
> dependencies (requiring root) in order to complete the package build.
> It could of course still prepare, by downloading distfiles and patches.

How do you want to handle changes between the preparing of the action
and the final application?

A refresh cache call from PackageKit and or from native tools should
tigger a re-preparation of the system upgrade and other transaction,
since it could now include additional packages which would need to be
downloaded or would miss at run time.

How do the update-viewer and the upgrade mechanism work together? Will
all updates be installed at reboot or will the update-viewer still
install updates on request? If not how will queuing several updates in
separate transaction be handled?

Cheers,

Sebastian
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