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83499f1a95
In v2.672 the default boot behavior of cloud images changed: - Prior to v2.672, cloud images with the linux-generic kernel attempt to boot without an initramfs, would fail, and then retry with an initramfs. - After v2.672, cloud images with the linux-generic kernel boot with an initramfs on the first try. While the behavior is different between the two, they both result in an instance that has booted with an initramfs. To ensure the changes in v2.672 do not regress, we need an automated way to check if we are attempting to boot without an initramfs and failing. With this change, when we attempt to boot with an initramfs and fail, initrdless_boot_fallback_triggered is set to non-zero in the grubenv. This value can be checked after boot by looking in /boot/grub/grubenv or by using the grub-editenv list command.