Major architectural pivot per the user's "RFC 2136 mechanism for the
existing zonefiles, not a new in-memory thing" framing. The plugin no
longer maintains its own in-memory state OR serves any queries -- both
of those are now the auto plugin's job, reading the same zone files.
The plugin's sole responsibility is now: receive TSIG-authed UPDATE
messages, edit the matching zones/<zone>.zone file, bump the SOA
serial in CalVer (YYYYMMDDNN) form, and optionally auto-commit to git.
What changed:
- DELETED: store.go (in-memory recordStore), store_test.go (12 tests),
plugin_test.go (10 ServeDNS query tests), old update_test.go.
- NEW: zonefile.go -- file-backed authority for one zone. loadRRs via
miekg/dns zone parser; mutation helpers (lookupIn/nameExistsIn/
removeRRsetFrom/removeRRFrom/removeNameFrom/addRRTo) on []dns.RR
slices; bumpSerial with CalVer semantics + NN exhaustion handling;
writeAtomic via temp-file rename; commit shells to `git add && git
commit` with configurable author.
- NEW: zonefile_test.go -- 17 tests covering load/lookup/mutate/bump/
write paths.
- REWRITTEN: plugin.go -- ServeDNS is now thin: UPDATE → TSIG → handler;
everything else → Next. No synthetic SOA/NS, no query serving.
- REWRITTEN: update.go -- handleUpdate now opens the zoneFile, loads,
applies (with prereq checks against the loaded RRs), bumps serial,
writes, commits. Detects no-op updates to avoid spurious file writes.
- REWRITTEN: setup.go -- new directives: `zones-dir` (required),
`auto-commit` (default true), `git-author <name> <email>`. Dropped
`nameserver` and `persist`. Validates each declared zone has a file
on disk via os.Stat before CoreDNS finishes starting.
- REWRITTEN: setup_test.go -- 17 cases for the new grammar.
- REWRITTEN: update_test.go -- 11 cases using real temp zone files
via t.TempDir().
Total: 30 tests passing, 0 failures.
Next: Phase 2c (custom CoreDNS image, deploy, smoke test with nsupdate).
