mara on PR #740 comment 9295: "we decided to go with the json" (issue #15 comment 9270:
"nginx container lives in system config, so it cannot be just rebuilt
from meta flake. go for the json file the c0re writes").
Drops:
- `cfg.agents` listOf str option
- Replicated FNV-1a hash + char-code table + manager-port special case
- Drift-hazard comment (no more rust↔nix constant sync)
Adds:
- `cfg.agentPortsFile = "/var/lib/hyperhive/agent-ports.json"` (default,
nullable to disable) — path to a JSON map of `{ "<name>": <port> }`
written by hive-c0re on every topology change.
- `agentPortsTable` reads the file at eval time via
`builtins.fromJSON (builtins.readFile path)`, guarded by
`builtins.pathExists` so a missing file gracefully defaults to `{}`.
- Per-agent locations generated via `lib.mapAttrs'` over the table —
one location block per entry; empty table → empty attrset → no
per-agent blocks, pre-#15 shape.
Rust-side dependency: hive-c0re needs to emit the JSON file on every
topology change. Coordinating with damocles via a separate ping — the
nix side ships now with safe defaults (missing file = no routes, no
behavior change vs main).
Verified:
- nix eval with `/tmp/test-agent-ports.json` → 4 per-agent blocks at
correct ports (8178 iris, 8267 argus, 8304 atlas, 8549 damocles)
- nix eval with nonexistent file → only `/` location (graceful default)
- full container toplevel builds clean with matrix on
Empty file case mirrors the previous empty-list default — purely
additive, old `<host>:<port>/` direct reach untouched, no per-agent
blocks until c0re writes the JSON. Operator can also `null` the
option to disable entirely.
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