Cannot manage subzones that are more than one level under parent

When attempting to add NS records for a subzone that is more than one level under the parent zone OctoDNS refuses to add the record.

I would expect to be able to configure the zone in the parent zone add a zone between the parent and child.

domain.tld.yaml

---
zone.stg:
  ttl: 600
  type: NS
  values:
    - ns1.domain.tld
    - ns2.domain.tld

zone.stg.domain.tld.yaml

---
record:
  ttl: 60
  type: A
  values:
    - 1.2.3.4

stg.domain.tld.yaml does not exist, nor is stg.domain.tld. configured in OctoDNS config, nor does stg.domain.tld. exist in any DNS server.

Results in:

Traceback (most recent call last):
  File "/usr/local/bin/octodns-sync", line 11, in <module>
    load_entry_point('octodns', 'console_scripts', 'octodns-sync')()
  File "/octodns/octodns/cmds/sync.py", line 39, in main
    dry_run=not args.doit, force=args.force)
  File "/octodns/octodns/manager.py", line 302, in sync
    plans = [p for f in futures for p in f.result()]
  File "/octodns/octodns/manager.py", line 56, in result
    return self.func(*self.args, **self.kwargs)
  File "/octodns/octodns/manager.py", line 224, in _populate_and_plan
    source.populate(zone)
  File "/octodns/octodns/provider/yaml.py", line 77, in populate
    self._populate_from_file(filename, zone, lenient)
  File "/octodns/octodns/provider/yaml.py", line 62, in _populate_from_file
    zone.add_record(record, lenient=lenient)
  File "/octodns/octodns/zone.py", line 68, in add_record
    .format(record.fqdn))
octodns.zone.SubzoneRecordException: Record zone.stg.domain.tld. is under a managed subzone

[nakato]

OctoDNS doesn’t really support adding NS records to subzones, except in the case of PowerDNS, where it is defined in the provider configuration. Issue #38 seems to contain the details on this, and a NS record on '' would be silently dropped anyways in zone.py

As I use PowerDNS, my Zone’s get their self-referencing NS ('') records set via the provider plugin, however this doesn’t create NS records in the parent zone pointing to the child zone. So while zone.stg.domain.tld works by luck of domain.tld being delegated to my nameserver, domain.tld is not able to appropriately delegate the nameservers of zone.stg.domain.tld.

---

Additionally, this config also demonstrates the issue, with the same crash.

domain.tld.yaml

stg:
  ttl: 600
  type: A
  value: 1.2.3.4

zone.stg.domain.tld.yaml

---
record:
  ttl: 60
  type: A
  values:
    - 1.2.3.4

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