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Raymund Will
e364307f6a
The GRUB emulator is used as a debugging utility but it could also be used as a user-space bootloader if there is support to boot an operating system. The Linux kernel is already able to (re)boot another kernel via the kexec boot mechanism. So the grub-emu tool could rely on this feature and have linux and initrd commands that are used to pass a kernel, initramfs image and command line parameters to kexec for booting a selected menu entry. By default the systemctl kexec option is used so systemd can shutdown all of the running services before doing a reboot using kexec. But if this is not present, it can fall back to executing the kexec user-space tool directly. The ability to force a kexec-reboot when systemctl kexec fails must only be used in controlled environments to avoid possible filesystem corruption and data loss. Signed-off-by: Raymund Will <rw@suse.com> Signed-off-by: John Jolly <jjolly@suse.com> Signed-off-by: Javier Martinez Canillas <javierm@redhat.com> Signed-off-by: Robbie Harwood <rharwood@redhat.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>