nsupdate.sh: ns_getdomain selects wrong server to send updates about uacme

[ndilieto]

I think you are right. nsupdate.sh was contributed by Michel Stam, so let's ask him what he thinks before deciding how to fix it.

@MichelStam have you got any comments on this?

[MichelStam]

Hi,

Good review.

• I agree that subdomains are not handled as best as they should. Intention is to extract the NS records to see which nameservers need to be tested for the presence/absence of the acme record. The dig for the SOA record is to verify which server qualifies as the primary NS and will get the nsupdate command.
• Dropping RNDC_KEY entirely would break multi-view DNS setups. By utilising the key you can force the correct view to be shown to dig.
• Script was written for bash, so probably changing it to bash would be preferable
• gethostname is indeed not used anymore. It was in an older version of the script and could be removed.

Cheers,

Michel