[hobbit] Debugging issues with bb-histlog.sh on 4.3.0

25 Jun 2009

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Date: Wed, 24 Jun 2009 23:16:39 -0500
From: ralphmitchell at gmail.com
To: hobbit at hswn.dk
Subject: Re: [hobbit] Debugging issues with bb-histlog.sh on 4.3.0
On Wed, Jun 24, 2009 at 10:55 PM, T.J. Yang> wrote:

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Date: Wed, 24 Jun 2009 18:42:17 -0600
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From: asparks at doublesparks.net
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To: hobbit at hswn.dk
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Subject: Re: [hobbit] Debugging issues with bb-histlog.sh on 4.3.0
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Ralph Mitchell wrote:
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On Wed, Jun 24, 2009 at 7:24 PM, Alan Sparks
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wrote:
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T.J. Yang wrote:
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I am experiencing same problem but it is on a 4.2.0 server.
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If you like, we can work together to debug this issue.
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This bug is listed on my hobbit deployment todo list .
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From: "Alan Sparks"
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I've some "random" failures on bb-histlog.sh, viewing items in
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the bb2
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event log. Some work as expected, but some when clicked appear
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to do
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nothing. Hitting the URL for that (say
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http://den2sch17/hobbit-cgi/bb-histlog.sh?HOST=den1ws063&SERVICE=nfs&TIMEBUF...
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)
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with curl shows a zero-length reply. Checking the Apache error log
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shows "Premature end of script headers: bb-histlog.sh, referer:
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http://den2sch17/hobbit/bb2.html". I have found no core files left
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behind.
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Well, I have mixed luck running under GDB... looking at the code,
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saw it
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was trying to get the CGI info from the environment so set some
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environment variables to fake up enough CGI environment to get it to
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run. But mostly wound up getting segfaults in expand_env on the
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HTMLCONTENTTYPE stuff.
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But I stumbled upon something that fixed my problem -- but not sure
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why. I edited the cgi-bin/bb-histlog.sh file, and added
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"cd /tmp" before the meat of the script. For some reason, I now
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seem to
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have no issues.
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Perhaps that ought to be "cd $BBTMP" instead?? Keep all Xymon stuff
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in one place.
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Ralph Mitchell
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BBTMP is not defined when this script runs...
Following is my debugging of my hobbit server implementation(using slightly different paths).
bb-hostsvc.sh has two lines of code.

". /etc/opt/hobbitserver42/hobbitcgi.cfg"

"exec /opt/hobbitserver42/bin/hobbitsvc.cgi $CGI_SVC_OPTS"

$CGI_SVC_OPTS variable got declared in hobbitcgi.cfg as following
CGI_SVC_OPTS="--env=/etc/opt/hobbitserver42/hobbitserver.cfg --no-svcid --history=top"
and in hobbitserver.cfg, BBTMP is declared also.
So I don't see why declaring BBTMP can help. but I did go ahead and re-declared BBTMP variable in bb-histlog.sh. The premature error message still showing in apache error_log file.
And I do see a core file under cig-bin and file command shows it is from hobbitsvc.cgi command.
But did you cd to $BBTMP as well as redefining it?? The only reason I mentioned it was that Alan reported that "cd /tmp" made it work. I just thought it would be better to cd into a place the Xymon owns.

following change still generate Premature errors.

BBTMP=/var/opt/hobbitserver42/tmp
cd ${BBTMP}
. /etc/opt/hobbitserver42/hobbitcgi.cfg
exec /opt/hobbitserver42/bin/hobbitsvc.cgi $CGI_SVC_OPTS
2. Tracing the src code now
http://hobbitmon.svn.sourceforge.net/viewvc/hobbitmon/branches/4.2.0/web/Mak...
HOBBITSVCOBJS   = hobbitsvc.o hobbitsvc-info.o hobbitsvc-trends.o
hobbitsvc.cgi is from hobbitsvc.c hobbitsvc-info.c hobbitsvc-trends.c.
tj
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Ralph Mitchell

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[hobbit] Debugging issues with bb-histlog.sh on 4.3.0

tj_yang＠hotmail.com