RFC: handling kernel cmdline options in gadget snaps

Oliver Grawert ogra at ubuntu.com
Wed Jul 8 13:05:30 UTC 2015

Am Mittwoch, den 08.07.2015, 13:55 +0200 schrieb Alexander Sack:
> On Tue, Jul 7, 2015 at 8:05 PM, Sergio Schvezov
> <sergio.schvezov at canonical.com> wrote:
> > On Tue, Jul 07, 2015 at 11:37:12AM -0600, Ben Howard wrote:
> >>
> >> What about making /etc/default/grub.d a writable path? Then a user would
> >> simply need to provide a config with
> >> GRUB_CMDLINE_LINUX_DEFAULT="console=tty1".
> >>
> >> But I think that this highlights the need for providing a simple way for
> >> users to populate the writable paths at build time. As I have been
> >> building Cloud Images, its a PITA to populate the writable paths. I
> >> think that having a "--writable <tarball>" option that takes <tarball>
> >> and populates /writable with the contents could solve a lot of pain.
> >> Having this feature would mean that instead of having to support the
> >> never-ending whack-a-mole requirements of "--<whatever>", users could
> >> use "--writable <tarball>".
> >
> > I;m lobbying for doing most of this through snappy config. A big blob of
> > config to setup and I don't mind having a syntax that looks like:
> >
> >     ubuntu-device-flash core 15.04 --config config.yaml ...
> >
> > For what it's worth, those grub dirs have become irrelevant and snappy
> > has complete control of the bootloader in the development series. You
> > can easily write your own grub.cfg from the gadget today.
> I agree that snappy config feels the way to go. That's how you do it
> after first boot and how you do things when producing factory images
> (through config in gadget). Having and overwrite option in udf for
> when developing your custom gadget sounds super sensible too and doing
> this will avoid adding more and more special config flags in udf.

yeah, while i find it awful to have to create a complete yaml file for
just changing a single option, this looks like the most sensible way to
go, thanks !!


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