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root the build the pre-start check names

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atlas 2026-10-28 21:16:54 +01:00 • committed by mara
commit 6708ef804f
2 changed files with 215 additions and 22 deletions
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10
docs/agent-lifecycle/persistence.md
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@ -406,8 +406,14 @@ repairs: the operator removes the offending entry, and the next start goes
through.
The drop-in names the `hive-priv` binary that wrote it, so a drop-in never
points at a build without the sub-command. A drop-in written by an older
hive-priv has no `ExecStartPre=` and the container starts as before.
points at a build without the sub-command. That build's store path has a GC
root, `/nix/var/nix/gcroots/hyperhive-check-rootfs/h-<name>`, written before the
drop-in and replaced on each write, so a garbage collection can't remove the
binary a restart would run. The directory sits beside `gcroots/per-container`,
which is the only gcroots path bound into a container, so only root writes it.
Destroying the container removes the drop-in and then its root; the build stays
until the next collection. A drop-in written by an older hive-priv has no
`ExecStartPre=` and no root, and the container starts as before.
The journal still ships. The agent's collector (`nix/agent-modules/otel.nix`)
reads the guest's own `/var/log/journal` and pushes it over OTLP, so no
journal link to the host takes part; nspawn skips `--link-journal=try-guest`

4
docs/trust-boundary/security.md
View file

@ -263,8 +263,8 @@ known operations; there is no arbitrary command pass-through:
| `ReloadGatewayNginx` | `systemctl reload/start/reset-failed nginx` (host unit; the unit name is hard-coded, not a parameter) |
| `WriteNspawnFlags` | write `/etc/nixos-containers/<container>.conf` (bind-mount list, network isolation vars, and `--ephemeral` after the root's salvage). hive-priv first copies a stopped container's root to the agent's `work/`, then renames it aside (it deletes nothing), following no link the container could have planted |
| `EnsureAgentSocketDir` | `mkdirat` `/run/hive-agent/<name>` `0751 root:root` under an `O_NOFOLLOW` parent fd; leaves an existing directory alone, refuses anything else |
| `WriteResourceLimits` | write `CPUQuota=`/`MemoryMax=`/`CPUWeight=`/`IOWeight=` systemd drop-in for agent container, with an `ExecStartPre=` that runs `hive-priv check-rootfs <container>` (no-follow check of the root paths the start script touches; see persistence.md) |
| `RemoveServiceDropin` | remove `container@<name>.service.d/` drop-in on destroy |
| `WriteResourceLimits` | write `CPUQuota=`/`MemoryMax=`/`CPUWeight=`/`IOWeight=` systemd drop-in for agent container, with an `ExecStartPre=` that runs `hive-priv check-rootfs <container>` (no-follow check of the root paths the start script touches; see persistence.md), and a GC root on the build it names |
| `RemoveServiceDropin` | remove `container@<name>.service.d/` drop-in on destroy, and the GC root of the hive-priv build it named |
| `DaemonReload` | `systemctl daemon-reload` |
| `ControlInfraContainer` | `systemctl <action> nginx.service` for the gateway — the `InfraContainer` enum is the allowlist, and serde rejects unknown names at the wire boundary (`hive-c0re`, the forge and the matrix have no variant, so no request can name them) |
| `SyncAgentTmpfiles` | unlink `/etc/tmpfiles.d/hyperhive-agents.conf` and return `Ok` |