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run agent containers on an ephemeral root, salvaging the old one first

Browse source 
hive-priv copies a stopped container's root to the agent's work dir and
renames it aside before passing nspawn --ephemeral; the agent's nix state
moves to the persistent profiles bind. Adds the agent-ephemeral-rootfs vm
test and a module-eval case for the nix state redirect.
This commit is contained in:
atlas 2026-10-28 19:15:26 +01:00 • committed by mara
commit 81439fa710
2 changed files with 1238 additions and 39 deletions
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3
docs/scheduler/ci.md
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@ -119,7 +119,8 @@ builds all of them nightly at 02:30; a failing test fails that run. To run one
by hand, start the workflow from the forge UI (Actions, vm-nightly, Run
workflow, optional `test` input), or run
`nix build .#vmTests.x86_64-linux.<name>` on a host with KVM. Current tests:
`hive-squid`.
`agent-ephemeral-rootfs` (the switch of an agent container to an ephemeral
root, through the real hive-priv unit) and `hive-squid`.
## Configuration reference

2
docs/scheduler/observability.md
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@ -340,7 +340,7 @@ exists, so off-the-shelf OTEL/Grafana container dashboards work. Resource
| `container.memory.usage` | `By` | gauge | `memory.current` |
| `hyperhive.container.memory.limit` | `By` | gauge | `memory.max` (custom — semconv has no `.limit` metric; omitted when unlimited) |
| `hyperhive.container.memory.peak` | `By` | gauge | `memory.peak` (custom — no semconv metric; omitted if unavailable) |
| `hyperhive.container.storage.usage` | `By` | gauge | `state/` + `work/` + writable rootfs, measured by `hive-priv` every 30 min (custom — semconv only has `disk.io`; omitted while unknown: not measured yet, or the last measurement failed) |
| `hyperhive.container.storage.usage` | `By` | gauge | `state/` + `work/` + the root template (the live ephemeral layer isn't counted), measured by `hive-priv` every 30 min (custom — semconv only has `disk.io`; omitted while unknown: not measured yet, or the last measurement failed) |
| `hyperhive.container.cpu.percent` | `%` | gauge | host-normalised percent (custom — no `rate()` needed) |
| `hyperhive.agent.unrestricted_internet` | `1` | gauge | the agent's `unrestricted_internet` flag in the swarm permissions this hive last read: `1` on, `0` off; a flag never set reads `1`. Omitted while the stored permissions file is unreadable |
| `hyperhive.agent.closure_pullable` | `1` | gauge | `1` when this hive can fetch the agent's latest closure from the swarm's binary cache and verify its signature, else `0` with a `reason` label (`no-record`, `rev-mismatch`, `not-cached`, `no-credentials`, `fetch-failed`, `bad-signature`; see [the builder docs](../swarm/builder.md#what-hives-do-with-the-cache)). Omitted before the first probe pass, every 5 minutes |