Public bug reported:
The proposed change allows users to enable "initrd-less" boot for
kernels that support it, by setting the GRUB_FORCE_PARTUUID
configuration variable in /etc/default/grub.
In case the user sets the variable today, the initrd line will not be
written, and some kernels will boot this way (faster, usually, since
there is no IO involved to lift the initrd from disk. This is
particularly relevant to cloud images for example).
This change allows the GRUB_FORCE_PARTUUID to be set more agressively,
by providing a fallback mechanism: should the initrd-less boot fail,
grub will try booting the same kernel with an initrd. To achieve this we
set a flag in grubenv, that is then cleaned very early in the userspace
boot process.
The rest of the behavior does not change.
Users not using initrd-less boots are unaffected by this change.
Users currently using initrd-less boots will still boot - and get a new
fallback in case the kernel they boot does not support initrd-less booting
(when upgrading or changing kernel flavor for example).
Testing done:
- Booting with and without initrd on a kernel that supports it (in this
particular case the -gcp kernel)
- Booting with and without initrd on a kernel that does *not* support it
(ensuring the fallback works)
- Tried to test the case where userspace sets "next boot" but it looks like the
feature allowing to do so regressed. This is independent of this FFe and will
be the subject of another bugreport (it's mentioned here since tangentially
relevant).
** Affects: grub2 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1754586
Title:
[FFe request] Enable booting initrd-less with fallback
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