[rancid] Ignore differences in certain lines?

[Alan McKinnon]

On 24/07/2014 20:38, Aaron Wasserott wrote:
> I got it to work, at least capturing additional input. The main thing I did to fix it was -not- put my new command at the bottom of the list. I kept getting this error:
> 
> Completed device.company.com: End of run not found
> 
> Then after moving my new command up in the commandtable array it worked fine.
> 
> Any thoughts/ideas on how to not email out based on changes to certain output?


I doubt that is possible without major surgery to the code. Two things
happen:

Files are booked into cvs/svn and that is an atomic process. CVS has to
work like that, it is almost useless otherwise.
If CVS recorded a diff, the diff is sent out as a mail.

You'll notice that CVS has no way to tag a changed line as somehow to be
recorded but not acted upon, so your only option is to hack rancid to
grab the output to be mailed and pass it through yet another perl text
parser (which you must maintain yourself)

It's so much easier to just have the rancid parser output the exact
information that you want to see. Rapidly changing data like current
state of an interface is better tracked through other monitoring tools.
Rancid is very bad at tracking state, but very very good at tracking the
changes people made on the cli (and providing restorable backups)


> 
> Thanks,
> 
> -Aaron
> 
> -----Original Message-----
> From: Rancid-discuss [mailto:rancid-discuss-bounces at shrubbery.net] On Behalf Of Aaron Wasserott
> Sent: Thursday, July 24, 2014 9:49 AM
> To: rancid-discuss at shrubbery.net
> Subject: Re: [rancid] Ignore differences in certain lines?
> 
>>> Trying to capture 'show interface status' output from Cisco IOS 
>>> switches, but ignore the output for diff purposes. Is that possible? 
>>> I guess it would have to be part of the mailer function to not send 
>>> output for certain lines.
>>>
>>>  
>>>
>>> I copied the ShowVLAN sub-routine because it already appends ! in 
>>> front of the lines, so they are not considered config lines. But 
>>> right now I can't even get the output captured.
>>>
>>> This is the new sub I am using:
>>>
>>> # This routine parses "show interface status"
>>>
>>> sub ShowIntStat {
>>>     print STDERR "    In ShowIntStat: $_" if ($debug);
>>>
>>>     #($_ = <INPUT>, return(1)) if (!$DO_SHOW_INT_STAT);
>>>
>>>     while (<INPUT>) {
>>>         tr/\015//d;
>>>         last if (/^$prompt/);
>>>         next if (/^(\s*|\s*$cmd\s*)$/);
>>>         return(1) if /^\s*\^\s*$/;
>>>         return(1) if /Line has invalid autocommand /;
>>>         return(1) if /(Invalid input detected|Type help or )/;
>>>         return(1) if /Ambiguous command/i;
>>>         # newer releases (~12.1(9)) place the vlan config in the normal
>>>         # configuration (write term).
>>>         #return(1) if ($type =~ /^(3550|4500)$/);
>>>         #return(1) if ($type !~ /^(2900XL|3500XL|6000)$/);
>>>         return(-1) if (/command authorization failed/i);
>>>         # the pager can not be disabled per-session on the PIX
>>>         if (/^(<-+ More -+>)/) {
>>>             my($len) = length($1);
>>>             s/^$1\s{$len}//;
>>>         }
>>>
>>>         ProcessHistory("COMMENTS","keysort","IO","!INT: $_");
>>>     }
>>>
>>>     ProcessHistory("COMMENTS","keysort","IO","!\n");
>>>     return(0);
>>> }
> 
>> Did you add corresponding entries to @command in the rancid script to match your new sub? Just follow the existing pattern, it's obvious how it must work.
> 
> Yep I added this line to the commandtable in the rancid file.
> 
> {'show interface status'        => 'ShowIntStat'},
> 
> It is picking it up, because if I rename the my sub-routine I see an error in the logs. So something inside the sub-routine is not parsing output right.
> 
> I'll play around with it some more.
> 
> Thanks,
> 
> -Aaron
> 
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> 


-- 
Alan McKinnon
alan.mckinnon at gmail.com