Bug#757298: Please add fallback boot entry for sysvinit when systemd is the active init

[Michael Biebl]

Hi Colin,

you mentioned in the CTTE discussions regarding switching to systemd on
wheezy to jessie upgrade that you'd be willing to review this patch [1].
Since time is running out to get non-RC bug fixes into jessie, it would
be great to have your feedback on this patch and ideally have it
uploaded before January, 5th if you consider it reasonable.

Michael

On Thu, 07 Aug 2014 02:53:35 +0200 Michael Biebl <biebl at debian.org> wrote:
> Package: grub-common
> Version: 2.02~beta2-11
> Severity: normal
> Tags: patch
> User: pkg-systemd-maintainers at lists.alioth.debian.org
> Usertags: integration
> 
> 
> Hi,
> 
> in [1] we laid out the plan how we want to manage the transition to
> systemd as the default init on Linux for Jessie.
> 
> One aspect of that transition plan, is to make sysvinit a transitional
> package (step b/) which provides a fallback /lib/sysvinit/init binary.
> So even if systemd is the default init and the /sbin/init binary is
> provided by systemd-sysv one can use the init=/lib/sysvinit/init boot
> parameter to boot using the old sysvinit system.
> 
> This is intended as a fallback mechanism in case the system fails to
> boot with systemd so users have a simpler method to recover the system
> and examine the failure.
> 
> To make this even more straightforward, we suggest that grub provides a
> menu entry for that sysvinit fallback.
> 
> Attached is patch achieving that.
> 
> I think it would be reasonable to drop this feature again in jessie+1 or
> jessie+2.
> 
> 
> Once this patch has been applied to grub, I sysvinit would have to be
> updated to call update-grub in postinst on install|upgrade and postrm
> on remove to ensure the menu entry is up-to-date.
> Do you have any suggestions regarding the the usage of update-grub?
> 
> 
> Your feedback would be most welcome.


[1] https://lists.debian.org/debian-ctte/2014/10/msg00057.html
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