Upgrades, kernel removal and last-good-boot

[Ben Collins]

On Fri, 2008-08-15 at 15:56 +0100, Matt Zimmerman wrote:
> On Fri, Aug 15, 2008 at 09:27:52AM -0400, Ben Collins wrote:
> > On Fri, 2008-08-15 at 12:59 +0100, Matt Zimmerman wrote:
> > > On Thu, Aug 14, 2008 at 04:50:17PM -0000, Michael Vogt wrote:
> > > > Changes: 
> > > >  apt (0.7.14ubuntu6) intrepid; urgency=low
> > > >  .
> > > >    * debian/apt.conf.autoremove:
> > > >      - remove "linux-image" (and friends) from the auto-remove
> > > >        blacklist. we have the kernel fallback infrastructure now
> > > >        in intrepid (thanks to BenC)
> > > 
> > > Do we need to do anything further to ensure that this is safe for upgrades
> > > from Hardy?  Will the system always have its old kernel saved in
> > > last-good-boot before it's removed?
> > 
> > For starters, removing the kernel from this exception doesn't mean it
> > any will get automatically removed (from what I'm told).
> 
> You're correct for incremental upgrades, but if I'm not mistaken, the
> release upgrader will explicitly clean up packages which are marked
> automatic.  This may not take effect if it's using the Hardy version of apt,
> though, since it still excludes kernels.
> 
> > Secondly, we've gone to great lengths to make sure that the system is
> > never rebooted unless last-good-boot has been run. The only way that
> > saving of the kernel would fail is if the system has a read-only root,
> > from what I can tell (or runs out of inodes, since we only do
> > hardlinks).
> > 
> > I'm pretty confident in the setup, but maybe it would be worth adding to
> > the QA to check that there is a last-good-boot entry on reboot, and try
> > booting into it.
> 
> I looked at the spec, which says that the last-good-boot setup will be saved
> by an init script in runlevel 2, but I couldn't find it.  Where does this
> code live?

/etc/event/last-good-boot