linux-kernel - Re: [systemd-devel] [PATCH v5 12/14] autoconf: xen: enable explicit preference option for xenstored preference

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Date:	Thu, 5 Jun 2014 12:26:51 -0700
From:	Andrew Lutomirski <luto@....edu>
To:	Lennart Poettering <mzxreary@...inter.de>
Cc:	"Luis R. Rodriguez" <mcgrof@...e.com>,
	Ian Campbell <Ian.Campbell@...rix.com>,
	Keir Fraser <keir@....org>, Tim Deegan <tim@....org>,
	Ian Jackson <ian.jackson@...citrix.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	systemd-devel@...ts.freedesktop.org,
	linux-security-module@...r.kernel.org,
	Eric Biederman <ebiederm@...ssion.com>,
	Jan Beulich <jbeulich@...e.com>,
	xen-devel@...ts.xenproject.org,
	"Andrew G. Morgan" <morgan@...nel.org>
Subject: Re: [systemd-devel] [PATCH v5 12/14] autoconf: xen: enable explicit
 preference option for xenstored preference

On Thu, Jun 5, 2014 at 12:24 PM, Lennart Poettering
<mzxreary@...inter.de> wrote:
> On Thu, 05.06.14 20:01, Luis R. Rodriguez (mcgrof@...e.com) wrote:
>
>> > Hmm? You should "exec" the real daemon binary at the end, not just fork
>> > it off. That wait the shell script process is replaced by the daemon
>> > binary, which is what you want.
>>
>> I tried both just running it and also running exec foo; both presented
>> the same issue given that shell exec does not really execve.
>
> Hmmm? You shell's "exec" command doesn't actually execve()? What are you
> using? This doesn't sound very accurate...

$ strace -e execve /bin/sh -c 'exec /bin/echo test'
execve("/bin/sh", ["/bin/sh", "-c", "exec /bin/echo test"], [/* 54 vars */]) = 0
execve("/bin/echo", ["/bin/echo", "test"], [/* 54 vars */]) = 0
test
+++ exited with 0 +++

I get similar results on Ubuntu using dash.

--Andy
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