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container stats: measure agent disk usage through hive-priv, unknown on failure

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The disk sampler ran `du -sxb` as the unprivileged hive-core user over
each agent's state/, work/ and container rootfs. hive-core cannot read
the rootfs or all of the agent-owned files, so `du` failed and each
failed path silently counted as 0: the dashboard showed a few MB for
agents using over 13 GB.

Add a hive-priv `MeasureAgentDisk { agent_name }` op. hive-priv
validates the name, derives the three paths itself (the request carries
no path), skips the ones that don't exist, and runs one
`du -s -x -b -c -P` as root with a 10 min timeout. A timeout, a non-zero
exit or output without a `total` line is an error.

hive-c0re calls it every 30 min instead of running `du` every 5 min:
each pass walks every agent's full tree as root on the disk the agents
work on, and the sizes move slowly. A failed measurement is cached as
None, so `disk_bytes` is null, the OTel storage.usage sample is omitted
and the dashboard shows "unknown", never 0.

`Coordinator::agent_work_dir` had no other caller and is removed.

Closes #4956
This commit is contained in:
atlas 2026-10-05 16:12:33 +02:00 • committed by mara
commit 98ccc31e2b
10 changed files with 244 additions and 179 deletions
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1
docs/trust-boundary/security.md
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@ -292,6 +292,7 @@ known operations; there is no arbitrary command pass-through:
| `EnsureBtrfsQuota` | `btrfs quota enable <AGENT_STATE_ROOT>`. Operator opt-in — enabling forces a full rescan |
| `ReadSubvolumeUsage` | `btrfs qgroup show -f --raw <state>/<name>` |
| `SetSubvolumeQuota` | `btrfs qgroup limit <bytes\|none> <state>/<name>` |
| `MeasureAgentDisk` | `du -s -x -b -c -P` over `<state>/<name>/state`, `<state>/<name>/work` and `/var/lib/nixos-containers/h-<name>`, killed after 10 min. hive-priv derives the paths from the name; the request carries none |
| `SnapshotAgentSubvolume` | `btrfs subvolume snapshot -r <agent_root> <snapshot_path>` — the frozen point-in-time copy a migration streams from |
| `DeleteAgentSnapshot` | `btrfs subvolume delete <snapshot_path>` |
| `SendAgentSnapshotToFile` | `btrfs send [-p <parent>] <snapshot>` into a bare filename under `MIGRATE_STAGING_ROOT`; refuses to overwrite an existing export |