Devuan bug report logs - #633
qemu-guest-agent: Guest agent does not shut down the guest when requested to

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Package: sysvinit; Maintainer for sysvinit is Devuan Developers <devuan-dev@lists.dyne.org>; Source for sysvinit is src:sysvinit.

Reported by: Fabio Muzzi <debianbugs@kurgan.org>

Date: Sat, 20 Nov 2021 19:12:01 UTC

Severity: grave

Tags: chimaera

Found in version 2.96-7+devuan1

Fixed in versions 3.00-1+devuan1, 2.96-7+devuan2

Done: dak@devuan.org

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Subject: bug#633: gdb trace - and a workaround
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From: Fabio Muzzi <debianbugs@kurgan.org>
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I have gone further and run gdb.

It seems that the agent actually tries to call /sbin/shutdown with the following parameters:

"-h -P +0 hypervisor initiated shutdown"


But if I run shutdown manually with  these parameters, I get an error and the help message shows up:



root@fileserver:/sbin# /sbin/shutdown -h -P +0 hypervisor initiated shutdown
Usage:    shutdown [-akrhPHfFnc] [-t sec] time [warning message]
                  -a:      use /etc/shutdown.allow
                  -k:      don't really shutdown, only warn.
                  -r:      reboot after shutdown.
                  -h:      halt after shutdown.
                  -P:      halt action is to turn off power.
                           can only be used along with -h flag.
                  -H:      halt action is to just halt.
                           can only be used along with -h flag.
                  -f:      do a 'fast' reboot (skip fsck).
                  -F:      Force fsck on reboot.
                  -n:      do not go through "init" but go down real fast.
                  -c:      cancel a running shutdown.
                  -q:      quiet mode - display fewer shutdown warnings.
                  -Q:      full quiet mode - display only final shutdown warning.
                  -t secs: delay between warning and kill signal.
                  ** the "time" argument is mandatory! (try "now") **



So it seems that /sbin/shutdown does not like the command line that qemu-agent uses.

It seems that the Devuan shutdown command wants a mandatory "time", so for example

shutdown -h -P now

works.

But the qemu agent uses a syntax that is wrong for the Devuan shutdown binary, while it works fine for the systemd-infested shutdown that is just a link to systemcl (in Debian 11).


A workaroung is to rename /sbin/shutdown and create a script that calls shutdown with a command line that it accepts, like:


/sbin/shutdown -h -P now hypervisor initiated shutdown

Notice the "now" instead of the "+0" in the arguments.


-- 
Fabio "Kurgan" Muzzi

- IZ4UFQ -

"Il massimo danno con il minimo sforzo"

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