hive-priv: create agent socket dirs on start; drop hyperhive-agents.conf
/etc/tmpfiles.d/hyperhive-agents.conf was a boot-time backstop (#2290) that pre-created every agent's bind sources. The start preamble already creates them for every c0re-driven start, and on this host only hive-c0re starts agent containers. The file was also the reason the socket dir's owner had to be declared there, which is how it spent its life at `0777 root root` whenever the uid could not be resolved (#4742). - hive-priv gains `EnsureAgentSocketDir { name }`, called from `set_nspawn_flags` in every start path. It creates `/run/hive-agent/<name>` `0751 root:root` with mkdirat relative to an O_DIRECTORY|O_NOFOLLOW fd for the parent. An existing entry has to be a directory (fstatat AT_SYMLINK_NOFOLLOW); anything else is refused, and a directory is left alone. hive-c0re's own create_dir_all went: its /run is read-only under ProtectSystem=strict. - The container's `hive-agent-user-migrate` activation chowns that dir to the agent user and sets 0751, the same way it already handles state/ and harness/. It refuses a symlink or non-directory there, since `test -d` and chmod follow links. No host-side passwd parse, and no window where the dir is world-writable. - `/run/hyperhive/agents/<name>` stays created by hive-c0re itself (`ensure_agent_runtime_dir`). It holds the `mcp.sock` that hive-c0re binds as hive-core, so it must not become root- or agent-owned. - The `/run/hive-agent` parent is declared in hive-priv.nix, `0755 root:root`, instead of hive-gateway's hive-core rule. hive-priv is its only writer now, and hive-priv's ReadWritePaths needs it to exist. - The manager start in `ensure_root_agent` now goes through `converge_start_preamble` + `start_with_fallback`. It was a bare start, so after a reboot the manager's bind sources existed only because of the tmpfiles file, and its limits drop-in did not exist at all. - Removed: `sync_tmpfiles`, `agent_uid_gid` / `parse_passwd_uid_gid`, `priv_client::sync_agent_tmpfiles`, `AgentTmpfilesEntry`, the tmpfiles body builder and their tests, plus the three call sites. - Legacy: hive-priv unlinks the file at every start, ignoring ENOENT. `SyncAgentTmpfiles` stays one release as a payload-ignoring variant that does the same unlink and returns Ok, for an older hive-c0re. Salvaged from #4752: the boundary.md correction that nginx only dials, because ProtectSystem=strict makes its /run read-only. Behaviour change: a manual `nixos-container start h-<name>` right after a reboot, before hive-c0re has started that agent, now fails on a missing bind source instead of starting. Closes #4742
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atlas
mara
parent
e7456a49ff
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2252c55df8
21 changed files with 369 additions and 421 deletions
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@ -290,6 +290,7 @@ known operations; there is no arbitrary command pass-through:
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| `ReadContainerJournal` | `journalctl -M <container> -n <n> [filters...]` |
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| `ReloadGatewayNginx` | `systemctl reload/start/reset-failed nginx` (host unit; the unit name is hard-coded, not a parameter) |
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| `WriteNspawnFlags` | write `/etc/nixos-containers/<container>.conf` (bind-mount list + network isolation vars) |
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| `EnsureAgentSocketDir` | `mkdirat` `/run/hive-agent/<name>` `0751 root:root` under an `O_NOFOLLOW` parent fd; leaves an existing directory alone, refuses anything else |
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| `WriteResourceLimits` | write `CPUQuota=`/`MemoryMax=`/`CPUWeight=`/`IOWeight=` systemd drop-in for agent container |
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| `RemoveServiceDropin` | remove `container@<name>.service.d/` drop-in on destroy |
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| `DaemonReload` | `systemctl daemon-reload` |
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@ -297,7 +298,7 @@ known operations; there is no arbitrary command pass-through:
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| `WriteAgentMatrixToken` | write `0600` credential file into agent state dir |
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| `RestartMatrixDaemon` | `systemctl --machine=h-<name> restart hive-matrix-daemon.service` |
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| `ControlInfraContainer` | `systemctl <action> container@<container>.service` — the `InfraContainer` enum is the allowlist, and serde rejects unknown names at the wire boundary (`hive-c0re` has no variant, so no request can name it) |
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| `SyncAgentTmpfiles` | write `/etc/tmpfiles.d/hyperhive-agents.conf` for the agent set, then `systemd-tmpfiles --create` |
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| `SyncAgentTmpfiles` | legacy: unlink `/etc/tmpfiles.d/hyperhive-agents.conf` and return `Ok`; kept one release for an older hive-c0re |
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| `SetAgentPaused` | create / remove the `<state>/<name>/harness/paused` marker that parks an agent's turn loop |
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| `WriteAgentGithubToken` | write `0600` `github-token` into agent state dir (same semantics as the forge/matrix token writes) |
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| `WriteAgentExtraForgeAccount` / `DeleteAgentExtraForgeAccount` | write / remove `forge-<label>-token` + a `forge-<label>.json` base-URL sidecar, both `0600`. hive-priv validates `label` as a plain identifier before it reaches the filename — an unchecked one traverses out of the state dir |
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