Re: [PATCH v1] emu/linux: work around systemctl kexec returning

[Daniel Kiper]

On Thu, Mar 23, 2023 at 11:59:51AM -0400, Robbie Harwood wrote:
> Per systemctl(1), it "is asynchronous; it will return after the reboot
> operation is enqueued, without waiting for it to complete".  This
> differs from kexec(8), which calls reboot(2) and therefore does not
> return.
>
> When not using fallback, this confusingly results in:
>
>     error trying to perform 'systemctl kexec': 0
>     Aborted. Press any key to exit.
>
> on screen for a bit, followed by successful kexec.
>
> To reduce the liklihood of hitting this case, add a delay on succesful
> return.  Ultimately, the systemd interface is racy: we can't avoid it
> entirely unless we never fallback on success.
>
> Signed-off-by: Robbie Harwood <rharwood@redhat.com>

Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

Daniel