Re: [Qemu-trivial] [PATCH] qga: Fix shutdown command of guest agent to work with SysV

[Michael Tokarev <mjt@tls.msk.ru>]

06.11.2013 05:54, whitearchey wrote:
> For now guest agent uses following command to shutdown system:
> shutdown -P +0 "blabla"
> but this syntax works only with shutdown command from systemd or upstart,
> because SysV shutdown requires -h switch.
>
> Following patch changes the command so it works with systemd, upstart and SysV

While the patch is one-liner indeed, it is a bit more than trivial.
Because it changes things in a non-obvious way, especially when
multiple systems are concerned.  Cc'ing qemu-devel@ due to this.

> --- a/qga/commands-posix.c
> +++ b/qga/commands-posix.c
> -        execle("/sbin/shutdown", "shutdown", shutdown_flag, "+0",
> +        execle("/sbin/shutdown", "shutdown", "-h", shutdown_flag, "+0",

Note that shutdown command is not in POSIX, despite the fact
that this is put into commands-posix.c

Note also that even shutdown from sysvinit on linux has another
option, -P, which mean poweroff, while -h means "halt OR poweroff"
(the latter is a bit unclear).

Does the same work on other *nixes?  *BSD?  Solaris?

Thanks,

/mjt