[rancid] Cisco devices and calculating percent free

[john heasley]

Thu, Nov 12, 2020 at 07:19:36AM -0600, Chris Wopat:
> I recently updated to v3.13, I do not recall exactly what version I
> was on but it was >1 year old, and could've been HEAD based on some
> previous debugging of other issues.
> 
> Anyhow, we have many IOS devices that calculate percent free and it oscillates:
> 
> - !Flash: bootflash: 1 GB total (19% free)
> + !Flash: bootflash: 1 GB total (18% free)
> 
> Without manually patching ios.pm (or wherever this takes place) is
> there any type of config setting to just turn off showing any info
> about how much disk space is free? We get this info properly from snmp
> trending systems.
> 
> Just trying to cut down on router diffs where there were no actual
> config changes.

Except that something to writing to your flash...maybe you expect that.

anyway, private devices types without the dir commands could be
created in rancid.types.conf(5).

or, i have almost finished an option for a user-defined per-device type
postscript filter.  eg:

+# example use of the postscript directive.  This will replace control
+# characters in the output with an ASCII representation.
+arbor-ctrl;script;rancid -t arbor-ctrl
+arbor-ctrl;login;anlogin
+arbor-ctrl;module;arbor
+arbor-ctrl;inloop;arbor::inloop
+arbor-ctrl;postscript;/bin/cat -v
+arbor-ctrl;command;arbor::ShowVersion;system version
+arbor-ctrl;command;arbor::ShowVersion;system file show
+arbor-ctrl;command;arbor::ShowHardware;system hardware
+arbor-ctrl;command;arbor::ShowHardware;system show
+arbor-ctrl;command;arbor::ShowFlash;system disk show
+arbor-ctrl;command;arbor::ShowConfig;config show