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Date: Mon, 12 Oct 2015 15:34:51 +0200
From: Olaf Hering <olaf@aepfle.de>
To: Karel Zak <kzak@redhat.com>
Cc: util-linux@vger.kernel.org
Subject: Re: regression in logger output to syslog
Message-ID: <20151012133451.GA6825@aepfle.de>
References: <20151009082541.GA9068@aepfle.de>
 <20151012104414.GF2356@ws.net.home>
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On Mon, Oct 12, Karel Zak wrote:

> On Fri, Oct 09, 2015 at 10:25:41AM +0200, Olaf Hering wrote:
> > I used a script with openSUSE 11.4 which called logger like this:
> > # logger -t "$l[$PPID] $i" "`sed -n ${c}p < $t`"
> > 
> > The tag was something like "me[123] foo: blah", and the number remained
> > stable for a single run.
> > 
> > Now with systemd and util-linux-2.26.2 the number does always change. 
> 
> Not sure if I understand the problem. How can logger update have any
> impact to the $PPID if this variable is generated by shell?

I'm sure the PPID variable itself is correct. But its value does not
appear anymore in journalctl -f.

>  $ logger --no-act --stderr --id=$PPID "this is message"
>  <13>Oct 12 12:40:07 kzak[1562]: this is message
>  $ logger --no-act --stderr --id=$PPID "this is message"
>  <13>Oct 12 12:40:07 kzak[1562]: this is message
> 
> .. still the same number. It seems that the problem is your script
> where is probably any fork/exec before logger call.

While having a 'journalctl -f &' running:

root@probook:~ # echo $PPID
2824
root@probook:~ # logger -t "me"  --id=$PPID "foo: blah"
root@probook:~ # Oct 12 15:29:55 probook.fritz.box me[6911]: foo: blah

root@probook:~ # logger -t "me"  --id=$PPID "foo: blah"
root@probook:~ # Oct 12 15:30:01 probook.fritz.box me[6912]: foo: blah
logger -t "me"  --id=$PPID "foo: blah"
root@probook:~ # Oct 12 15:30:05 probook.fritz.box me[6939]: foo: blah
root@probook:~ # logger -t "me" --no-act --stderr  --id=$PPID "foo: blah"
<13>Oct 12 15:32:26 me[2824]: foo: blah
root@probook:~ # logger -t "me" --no-act --stderr  --id=$PPID "foo: blah"
<13>Oct 12 15:32:28 me[2824]: foo: blah


So, its "systemd" who eats the required info.


Olaf