[rancid] frr/zebra more info

[heasley]

Mon, Mar 09, 2026 at 11:27:13AM -0700, Randy Bush:
> currently, for frr systems,
>   o i use `zebra` in the `router.db` definition
>   o the rancid user on the target is ssh keyed (with command
>     restriction)
>   o the `/etc/passwd` entry for rancid has the shell defined as
>     `/home/rancid/do-vtysh`
>   o that script simply does `sudo /bin/vtysh`
> 
> and that works for the `show running config`
> 
> but i would also like to capture, archive, and diff
>   o `/etc/network/interfaces` and
>   o `/etc/nftables.conf`
> 
> do i hack the `/home/rancid/do-vtysh` script to simply `cat` them to
> stdout?  i dread creating a new, or augmenting existing, rancid device
> type.

I doubt that will work.  I expect it will just be filtered.

Maybe adding to the command list like:
	<name>;command;rancid::<writefunc>;start-shell cat /etc/network/interfaces

does that command actually work?  docs imply that it does.