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fix: forge URL + firewall for isolateContainers=true

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When containers run in private netns (isolateContainers=true), host
loopback is unreachable so HIVE_FORGE_URL=http://127.0.0.1:3000 breaks.

- nix/modules/hive-network.nix: when isolateContainers is on + forge
  is enabled, open forge.httpPort on the bridge interface so agents
  can reach forgejo at bridgeIp:httpPort (forgejo binds 0.0.0.0)
- nix/modules/hive-c0re.nix: HIVE_FORGE_URL switches to bridge IP
  when network.enable && isolateContainers; loopback path retained
  when isolateContainers=false
- docs/network.md: add Forge access + Forge URL rows to effects table
- docs/gateway.md: rewrite HIVE_FORGE_URL section for both modes
This commit is contained in:
atlas 2026-06-03 16:01:23 +02:00 • committed by mara
commit c97120f016
4 changed files with 38 additions and 11 deletions
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17
docs/gateway.md
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@ -200,13 +200,20 @@ dashboard reach by design — the surface is privileged (approve /
deny / destroy) and must not be exposed without a real reverse
proxy in front.
## `HIVE_FORGE_URL`: loopback for in-cluster, sub-domain for the operator
## `HIVE_FORGE_URL`: bridge gateway for isolated agents, loopback for shared-netns
Agents poll `HIVE_FORGE_URL` for Forgejo notifications + run all
`hive-forge` calls against it. `hive-c0re.nix` pins this to
`http://127.0.0.1:<forge.httpPort>` for the in-cluster path: every
agent container shares the host's network namespace, so loopback
reaches the forge container directly with no DNS lookup needed.
`hive-forge` calls against it. `hive-c0re.nix` sets this based on the
network isolation mode:
- **`network.isolateContainers = true`**: agents run in private netns,
so host loopback is unreachable. `HIVE_FORGE_URL` is set to
`http://<bridgeIp>:<forge.httpPort>`. Forgejo binds `0.0.0.0` so it's
reachable at the bridge gateway IP. `hive-network.nix` opens
`forge.httpPort` on the bridge interface automatically.
- **`network.isolateContainers = false`** (default): agents share the host's
network namespace, so loopback reaches forgejo directly. `HIVE_FORGE_URL`
is `http://127.0.0.1:<forge.httpPort>`.
The sub-domain default (`forge.<hive-domain>`) is for **operator
browsers + cross-host clients**, not in-cluster traffic. Using the