eec908bdb7
Rewrite two bare issue references (#4472, #4477) as self-standing prose per check-issue-refs.sh's requirement — no markdown exemption, hash-number tags are dead weight to a public forge-mirror reader. Apply iris's vale fix to docs/agent-lifecycle/approvals.md (passive voice, two contractions, one auto- hyphenation).
525 lines
24 KiB
Rust
525 lines
24 KiB
Rust
//! Per-container host-side config: the nspawn conf rewrite (bind mounts,
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//! network isolation, forwarded credentials), the systemd resource-limits
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//! drop-in, and the `write_dropins` verb that re-applies both.
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use std::path::{Path, PathBuf};
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use anyhow::{Context, Result};
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use hive_priv_sock::{BindMount, CredentialMount};
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use hive_sh4re::permissions::Capability;
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use crate::coordinator::{AgentPaths, HiveEnv};
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use super::{
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AGENT_PREFIX, CONTAINER_RUNTIME_MOUNT, CONTAINER_SHARED_MOUNT, container_claude_mount,
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container_name, validate,
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};
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/// Re-apply the per-container host-side config: nspawn flags (bind
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/// mounts etc.), the systemd resource-limits drop-in, and a daemon
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/// reload so both take effect on the next unit (re)start. Idempotent —
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/// the job queue's `WriteDropin` node, also folded into every `Swap`
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/// (rebuild is the reconcile verb).
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pub async fn write_dropins(name: &str, hive: &HiveEnv, paths: &AgentPaths) -> Result<()> {
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validate(name)?;
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let container = container_name(name);
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set_nspawn_flags(&container, &paths.agent, &paths.claude, &paths.notes).await?;
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let (cpu_quota, memory_max) =
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crate::resource_limits::effective(name, &hive.agent_cpu_quota, &hive.agent_memory_max);
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set_resource_limits(
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&container,
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&cpu_quota,
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&memory_max,
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hive.agent_cpu_weight,
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hive.agent_io_weight,
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)
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.await?;
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systemd_daemon_reload().await
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}
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/// Write a systemd drop-in for `container@<container>.service` that applies
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/// the agent's effective resource caps — its per-agent overrides from
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/// `meta/resource-limits.json` where set, the hive-wide defaults
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/// otherwise. Goes under `/run/systemd/system/...` so it's ephemeral
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/// (regenerated on every spawn / rebuild).
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///
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/// The weights are hive-wide (`services.hyperhive.agentCpuWeight` /
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/// `agentIoWeight`) — unlike the caps they have no per-agent override in
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/// `meta/resource-limits.json`, so they come straight off [`HiveEnv`].
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/// `None` (the nix option set to `null`) means the weight line is left out
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/// and the container keeps the kernel default.
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async fn set_resource_limits(
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container: &str,
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cpu_quota: &str,
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memory_max: &str,
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cpu_weight: Option<u32>,
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io_weight: Option<u32>,
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) -> Result<()> {
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crate::priv_client::write_resource_limits(
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container, memory_max, cpu_quota, cpu_weight, io_weight,
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)
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.await
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}
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async fn systemd_daemon_reload() -> Result<()> {
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crate::priv_client::daemon_reload().await
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}
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/// Where the manager sees the applied trees of every agent, read-only.
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/// Manager runs `git fetch /applied/<n>/.git refs/tags/*:refs/tags/applied/*`
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/// to learn what hive-c0re deployed (or rejected, or failed to
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/// build); the RO bind makes accidental writes impossible from
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/// inside the container.
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pub const CONTAINER_MANAGER_APPLIED_MOUNT: &str = "/applied";
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/// Host path behind every `/agents/<name>/config` mount: the **applied**
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/// (deployed) repo, not the working clone at `agents/<name>/config`. That
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/// clone is where a config change is staged, so it can hold a proposal
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/// that is still under review or was rejected outright — mounting it shows
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/// an agent a config which does not govern it. Both mounts (an agent's own
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/// and a parent's view of a child's) go through here so they cannot drift.
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///
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/// Never empty under a live container: `provision_container` runs
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/// `setup_applied` before `create_only` makes the container at all.
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fn config_bind_source(name: &str) -> PathBuf {
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crate::paths::applied_dir(name)
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}
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/// Append bind flags for `child`'s state and config dirs into `binds`.
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/// See docs/agent-lifecycle/persistence.md ("Parent access to child state") for what a
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/// parent may touch and why. Creates missing host-side directories so
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/// nspawn doesn't refuse to start; missing dirs are non-fatal.
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///
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/// **Three dirs, three different answers** — the uniformity of the
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/// original loop is what hid that:
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///
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/// - `state` is **read-write**: a parent reads and writes a child's notes
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/// to recover it, which is the one case that needs to work while the
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/// child is down.
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/// - `config` is **read-only**, and read-only for the *parent* is the
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/// point: a config change is a PR against the child's repo on the
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/// forge, reviewed and merged, never an edit in place. A writable mount
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/// here is a second path to the same file that skips the review — the
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/// boundary would then be a convention rather than a permission.
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/// - `harness` is **absent entirely**. It holds the child's own runtime
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/// material — `bash-tasks/`, turn-stats and event sqlite dbs — none of
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/// which a parent has a stated reason to read, let alone write.
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/// hive-c0re still reads it directly on the host (`stats::hive_stats`),
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/// which needs no bind mount into the parent.
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///
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/// ⚠️ The config-repo seeding hive-c0re does at spawn is **not** affected by
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/// the `config` flag and must not be read as a reason to widen it: that runs
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/// as hive-c0re against the host path (see `lifecycle::setup_proposed`), and
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/// `read_only` on a bind constrains writers *inside* the container only.
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fn bind_child_agent_dirs(child: &str, binds: &mut Vec<BindMount>) {
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let Ok(child) = hive_types::Ident::parse(child) else {
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tracing::warn!(%child, "skipping child bind: invalid agent name");
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return;
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};
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let child_root = crate::paths::agent_state_dir(&child);
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for (sub, host, read_only) in [
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("state", child_root.join("state"), false),
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("config", config_bind_source(child.as_str()), true),
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] {
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let _ = std::fs::create_dir_all(&host);
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binds.push(BindMount {
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host_path: host.to_string_lossy().into_owned(),
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container_path: format!("/agents/{child}/{sub}"),
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read_only,
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});
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}
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}
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/// Env var naming the host directory `swarm-bao-queue-agent.service` lands
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/// this hive's agent queue credential in. Set by the hive-c0re NixOS module
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/// from `deploy.hive-controller.queue.agentCredentialDir`; absent means this
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/// daemon runs outside its unit, which is the same "no queue credential"
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/// answer as an empty directory.
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const QUEUE_CREDENTIAL_DIR_ENV: &str = "HIVE_C0RE_AGENT_QUEUE_CREDENTIAL_DIR";
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/// systemd credential ids the two files arrive under inside the container.
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/// `nix/agent-modules/queue.nix` spells the same two names in the harness
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/// unit's `LoadCredential=`; neither side can discover the other's, so a
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/// rename here is a rename there.
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const QUEUE_SECRET_CREDENTIAL: &str = "hive-queue-agent-secret";
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const QUEUE_CLIENT_ID_CREDENTIAL: &str = "hive-queue-agent-client-id";
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/// Forward this hive's agent queue credential into `agent_name`'s container
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/// as two systemd credentials, or nothing when the publisher has not landed
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/// it yet.
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///
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/// **A credential and not a bind mount, because of the mode.** The secret is
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/// `root:0600` on the host and the harness runs as the unprivileged agent
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/// user, so a bind would deliver a file that user cannot open. nspawn's
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/// `--load-credential` is read by the container manager as root and
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/// re-exposed under the consuming unit's own `User=`, which is the whole
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/// difference. hive-c0re never reads the bytes either way — it runs as
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/// `hive-core` and only ever needs to know the file is *there*, which a
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/// `0755` directory permits.
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///
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/// **Absent files are legal.** Authelia mints the secret on its first boot
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/// and a publisher on that host puts it in the store, so "nothing at that
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/// path" is the ordinary early state of a swarm rather than a fault. Saying
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/// so at `info!` is what keeps it from being invisible: without a line here,
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/// an agent that never connects looks identical to one that was never
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/// configured.
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fn queue_agent_credentials(agent_name: &str, dir: Option<&Path>) -> Vec<CredentialMount> {
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let Some(dir) = dir else {
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tracing::info!(
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%agent_name,
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"no {QUEUE_CREDENTIAL_DIR_ENV} in this daemon's environment — agent gets no swarm queue credential"
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);
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return Vec::new();
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};
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let secret = dir.join("secret");
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let client_id = dir.join("client_id");
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// Both or neither, for the same reason `QueueConfig::from_env` refuses a
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// half-set environment: a client holding one of the two comes up fine and
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// never connects.
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if !secret.is_file() || !client_id.is_file() {
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tracing::info!(
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%agent_name, dir = %dir.display(),
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"swarm queue credential not published yet — agent gets no swarm queue credential"
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);
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return Vec::new();
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}
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vec![
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CredentialMount {
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name: QUEUE_SECRET_CREDENTIAL.to_owned(),
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host_path: secret.to_string_lossy().into_owned(),
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},
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CredentialMount {
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name: QUEUE_CLIENT_ID_CREDENTIAL.to_owned(),
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host_path: client_id.to_string_lossy().into_owned(),
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},
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]
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}
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/// Idempotently rewrite the lines in `/etc/nixos-containers/<container>.conf`
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/// that hive-c0re owns: `PRIVATE_NETWORK` (always 1), `HOST_ADDRESS` (the
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/// bridge gateway IP) and `EXTRA_NSPAWN_FLAGS` (the runtime-dir bind). What
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/// those network vars mean and why isolation is unconditional:
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/// `docs/networking/network.md` § *What the Rust side does*.
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///
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/// ⚠️ The start script expands `$EXTRA_NSPAWN_FLAGS` unquoted into the
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/// `systemd-nspawn` command.
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#[allow(
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clippy::too_many_lines,
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reason = "one contiguous nspawn-flag assembly block; the length is the flag \
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surface itself, splitting it would just hide the shape"
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)]
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async fn set_nspawn_flags(
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container: &str,
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runtime_dir: &Path,
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claude_dir: &Path,
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notes_dir: &Path,
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) -> Result<()> {
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// Ensure /shared directory exists before binding. systemd-nspawn requires the bind source to exist.
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let shared_root = crate::paths::shared_root();
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std::fs::create_dir_all(&shared_root)
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.with_context(|| format!("create {}", shared_root.display()))?;
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// Make /shared writable by every agent. Containers share host uids (no
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// PrivateUsers), but each agent is a distinct unix user, so a root-owned
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// 0755 dir leaves them unable to write — the documented "read/write for
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// all agents" contract was broken. A setgid group would need a
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// pinned GID declared in every container plus all agent users joined to
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// it (cross-container coordination + a rebuild cascade); instead we use
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// the /tmp model — sticky world-writable (1777). The sticky bit lets any
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// agent create files while protecting each agent's entries from deletion
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// by the others, and matches /shared's documented "free-for-all, may be
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// deleted/lost" semantics without touching any per-agent config.
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{
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use std::os::unix::fs::PermissionsExt as _;
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let perms = std::fs::Permissions::from_mode(0o1777);
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std::fs::set_permissions(&shared_root, perms)
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.with_context(|| format!("chmod 1777 {}", shared_root.display()))?;
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}
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// Ensure /knowledge dir exists. It may be empty until forge seeds it;
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// nspawn refuses to start if the bind source is missing entirely.
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std::fs::create_dir_all(crate::knowledge::LOCAL_DIR)
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.with_context(|| format!("create {}", crate::knowledge::LOCAL_DIR))?;
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// Logical agent name — strip the `h-` prefix.
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// For the manager: `h-ruth` → `ruth`. For sub-agents: `h-iris` → `iris`.
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let agent_name = container.strip_prefix(AGENT_PREFIX).unwrap_or(container);
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// Claude credentials land at `/home/<agent>/.claude` so the
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// `claude` CLI (which reads `$HOME/.claude`) finds them. The
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// harness service's environment sets `HOME` to the same path
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// (`agent.nix` / `ruth.nix` templates), so no `--setenv` plumbing
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// is needed here — the bind alone is enough.
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let claude_mount = container_claude_mount(agent_name);
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// The agent's own swarm-queue credential — the one thing forwarded in
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// here, and forwarded *as a credential* rather than a bind for the
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// reason `queue_agent_credentials` records.
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let queue_credential_dir = std::env::var_os(QUEUE_CREDENTIAL_DIR_ENV).map(PathBuf::from);
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let mut load_creds = queue_agent_credentials(agent_name, queue_credential_dir.as_deref());
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// The agent's own identity *at* the swarm secret store, collected under
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// this hive's certificate and forwarded the same way and for the same
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// reason. Staged here rather than at spawn because this is the one place
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// that writes the container's credential list — see
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// `super::agent_identity` for the whole hop.
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load_creds.extend(super::agent_identity::stage(agent_name).await);
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let mut binds: Vec<BindMount> = vec![
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BindMount {
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host_path: runtime_dir.to_string_lossy().into_owned(),
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container_path: CONTAINER_RUNTIME_MOUNT.to_owned(),
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read_only: false,
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},
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BindMount {
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host_path: claude_dir.to_string_lossy().into_owned(),
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container_path: claude_mount,
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read_only: false,
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},
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BindMount {
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host_path: shared_root.to_string_lossy().into_owned(),
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container_path: CONTAINER_SHARED_MOUNT.to_owned(),
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read_only: false,
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},
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BindMount {
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host_path: crate::knowledge::LOCAL_DIR.to_owned(),
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container_path: crate::knowledge::CONTAINER_MOUNT.to_owned(),
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read_only: true,
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},
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];
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// Own state, harness, and config dirs — same for every agent including
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// the manager. Config is RO: an agent must not edit its own config; changes
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// only ever flow through the approval queue.
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binds.push(BindMount {
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host_path: notes_dir.to_string_lossy().into_owned(),
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container_path: format!("/agents/{agent_name}/state"),
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read_only: false,
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});
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if let Some(state_parent) = notes_dir.parent() {
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let harness_dir = state_parent.join("harness");
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if !harness_dir.exists() {
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let _ = std::fs::create_dir_all(&harness_dir);
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}
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binds.push(BindMount {
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host_path: harness_dir.to_string_lossy().into_owned(),
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container_path: format!("/agents/{agent_name}/harness"),
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read_only: false,
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});
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}
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hive_types::Ident::parse(agent_name)
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.map_err(|e| anyhow::anyhow!("invalid agent name {agent_name:?}: {e}"))?;
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let own_config = config_bind_source(agent_name);
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std::fs::create_dir_all(&own_config)
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.with_context(|| format!("create {}", own_config.display()))?;
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binds.push(BindMount {
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host_path: own_config.to_string_lossy().into_owned(),
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container_path: format!("/agents/{agent_name}/config"),
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read_only: true,
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});
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// Topology-driven child mounts: every direct child of this agent gets
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// its state dir RW and its config dir RO. See `bind_child_agent_dirs`
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// for why each is what it is.
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let direct_children = crate::topology::children_of(agent_name);
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for child in &direct_children {
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bind_child_agent_dirs(child, &mut binds);
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}
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// `ManageRootAgent` capability: additionally mount *every* agent in
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// the hive as a virtual child. Enables recovery — the holder can
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// update another agent's config even when that agent is down. Also
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// grants RO access to /applied and /meta.
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//
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// ⚠️ "every agent" reads as a widening next to the `children_of`
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// mounts above, so: it is the definition of this capability, not an
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// accident of how the set is computed. The grant used to hang off a
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// `can_manage_top_level_agents` role and cover `top_level_agents()`
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// — i.e. `parent.is_none()` — which was "everything outside the
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// hierarchy". With that hierarchy removed, every agent is
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// parentless, so that set *was* every agent anyway; the capability
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// now says so out loud instead of deriving it from a field that no
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// longer discriminates.
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if crate::capabilities::has_cap(agent_name, Capability::ManageRootAgent) {
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// Skipping self is a no-op, not a narrowing: `agent_notes_dir` is
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// `agent_state_dir/state` and `config_bind_source` is shared, so
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// binding the holder as its own virtual child reproduced the two
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// own-dir mounts pushed above, byte for byte.
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for other in crate::topology::all_agents() {
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if other != agent_name && !direct_children.contains(&other) {
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bind_child_agent_dirs(&other, &mut binds);
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}
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}
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// systemd-nspawn refuses to start a container whose bind
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// source doesn't exist. The meta repo is created by the
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// startup migration, but make sure the directory is there
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// before the role holder comes up in case set_nspawn_flags
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// fires first (e.g. cold start with no agents).
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let meta_root = crate::paths::meta_root();
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std::fs::create_dir_all(&meta_root)
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.with_context(|| format!("create {}", meta_root.display()))?;
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binds.push(BindMount {
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host_path: crate::paths::applied_root().to_string_lossy().into_owned(),
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container_path: CONTAINER_MANAGER_APPLIED_MOUNT.to_owned(),
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read_only: true,
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});
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binds.push(BindMount {
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host_path: meta_root.to_string_lossy().into_owned(),
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container_path: crate::meta::CONTAINER_MANAGER_META_MOUNT.to_owned(),
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read_only: true,
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});
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}
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// Web-socket subdir: bind-mount `/run/hive-agent/<name>/` into the
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// container so the harness can bind `web.sock` there and the host-side
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// gateway sees it. Subdir bind (not socket file) keeps the inode
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// visible after the harness unlinks a stale socket on rebind.
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// Applies to manager and sub-agents alike.
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let socket_dir = crate::agent_sockets::agent_dir_for(agent_name);
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std::fs::create_dir_all(&socket_dir)
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.with_context(|| format!("create {}", socket_dir.display()))?;
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// Ownership is NOT repaired here. The dir's owner + mode are declared by
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// the tmpfiles.d entry (`SyncAgentTmpfiles`), which is the mechanism that
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// re-applies on every boot and every spawn — so a chown made here was
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// silently reverted the next time any agent was spawned or destroyed.
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// This `create_dir_all` only covers the window before that sync lands.
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binds.push(BindMount {
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host_path: socket_dir.to_string_lossy().into_owned(),
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container_path: socket_dir.to_string_lossy().into_owned(),
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read_only: false,
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});
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// Every container runs in a private network namespace with a veth
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// pair attached to the host bridge — including the manager (all
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// hive-c0re<->agent comms go through bind-mounted UDS, not TCP).
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// There is no non-isolated mode to fall back to, and the settings
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// are process-global, so anything wrong here was already fatal at
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// daemon startup; this call cannot newly fail.
|
|
let isolation = super::network_isolation_from_env()?;
|
|
tracing::info!(
|
|
%agent_name, gateway_ip = %isolation.gateway_ip, bridge = %isolation.bridge,
|
|
"network isolation: PRIVATE_NETWORK=1 (DHCP)"
|
|
);
|
|
|
|
// Delegate the actual conf-file rewrite to hive-priv (runs as root).
|
|
crate::priv_client::write_nspawn_flags(container, &binds, isolation, &load_creds).await
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::{
|
|
BindMount, QUEUE_CLIENT_ID_CREDENTIAL, QUEUE_SECRET_CREDENTIAL, bind_child_agent_dirs,
|
|
queue_agent_credentials,
|
|
};
|
|
|
|
fn child_binds() -> Vec<BindMount> {
|
|
let mut binds = Vec::new();
|
|
bind_child_agent_dirs("kiddo", &mut binds);
|
|
binds
|
|
}
|
|
|
|
/// The boundary, asserted as a whole rather than per-dir: a parent
|
|
/// sees a child's `state` and `config`, and nothing else.
|
|
#[test]
|
|
fn parent_sees_only_child_state_and_config() {
|
|
let paths: Vec<String> = child_binds()
|
|
.into_iter()
|
|
.map(|b| b.container_path)
|
|
.collect();
|
|
assert_eq!(paths, ["/agents/kiddo/state", "/agents/kiddo/config"]);
|
|
}
|
|
|
|
/// The `config` mount names the **deployed** tree, not the working
|
|
/// clone the proposal is staged in. Asserted as "outside the child's
|
|
/// own dir" rather than by equality: the point is that the two are
|
|
/// different objects, which is what makes the mount unable to show a
|
|
/// config that was never approved. Equality with `applied_dir` would
|
|
/// restate the implementation and pass under any future relocation.
|
|
#[test]
|
|
fn child_config_mount_is_the_deployed_tree_not_the_working_clone() {
|
|
let working_clone =
|
|
crate::paths::agent_state_dir(&hive_types::Ident::parse("kiddo").expect("valid ident"));
|
|
let config = child_binds()
|
|
.into_iter()
|
|
.find(|b| b.container_path.ends_with("/config"))
|
|
.expect("a config bind");
|
|
assert!(
|
|
!std::path::Path::new(&config.host_path).starts_with(&working_clone),
|
|
"config mount must not come from the child's working clone: {}",
|
|
config.host_path
|
|
);
|
|
}
|
|
|
|
/// The regression this exists for. `harness` holds the child's own
|
|
/// runtime material and was only ever mounted because one loop
|
|
/// treated all three dirs alike — re-adding it to that loop is a
|
|
/// one-word change that nothing else would catch.
|
|
#[test]
|
|
fn parent_never_sees_a_child_harness_dir() {
|
|
for bind in child_binds() {
|
|
assert!(
|
|
!bind.container_path.contains("harness"),
|
|
"child harness must not be bound into a parent: {}",
|
|
bind.container_path
|
|
);
|
|
assert!(
|
|
!bind.host_path.contains("harness"),
|
|
"child harness must not be bound into a parent: {}",
|
|
bind.host_path
|
|
);
|
|
}
|
|
}
|
|
|
|
/// An unparseable name yields no mounts at all — the guard must fail
|
|
/// closed, since the alternative is a path built from unvalidated
|
|
/// input.
|
|
#[test]
|
|
fn an_invalid_child_name_binds_nothing() {
|
|
let mut binds = Vec::new();
|
|
bind_child_agent_dirs("../escape", &mut binds);
|
|
assert!(binds.is_empty());
|
|
}
|
|
|
|
/// The ordinary state of a swarm before the publisher on the authelia
|
|
/// host has run: the directory is named and empty. Forwarding a
|
|
/// credential whose source does not exist would make every agent
|
|
/// container refuse to start, so this has to be silence-with-a-log
|
|
/// rather than a partial list.
|
|
#[test]
|
|
fn an_unpublished_queue_credential_forwards_nothing() {
|
|
let dir = tempfile::tempdir().expect("tempdir");
|
|
assert!(queue_agent_credentials("iris", None).is_empty());
|
|
assert!(queue_agent_credentials("iris", Some(dir.path())).is_empty());
|
|
std::fs::write(dir.path().join("secret"), "s").expect("write secret");
|
|
assert!(
|
|
queue_agent_credentials("iris", Some(dir.path())).is_empty(),
|
|
"a secret with no client id is not a usable credential"
|
|
);
|
|
}
|
|
|
|
/// Both files present: two credentials, named the same two ids the
|
|
/// harness unit imports, pointing at the two files the reader unit
|
|
/// wrote.
|
|
#[test]
|
|
fn a_published_queue_credential_forwards_both_files() {
|
|
let dir = tempfile::tempdir().expect("tempdir");
|
|
std::fs::write(dir.path().join("secret"), "s").expect("write secret");
|
|
std::fs::write(dir.path().join("client_id"), "hive-h1-agent").expect("write client_id");
|
|
let creds = queue_agent_credentials("iris", Some(dir.path()));
|
|
let named: Vec<(String, String)> = creds
|
|
.into_iter()
|
|
.map(|c| (c.name, c.host_path))
|
|
.collect::<Vec<_>>();
|
|
assert_eq!(
|
|
named,
|
|
[
|
|
(
|
|
QUEUE_SECRET_CREDENTIAL.to_owned(),
|
|
dir.path().join("secret").to_string_lossy().into_owned(),
|
|
),
|
|
(
|
|
QUEUE_CLIENT_ID_CREDENTIAL.to_owned(),
|
|
dir.path().join("client_id").to_string_lossy().into_owned(),
|
|
),
|
|
]
|
|
);
|
|
}
|
|
}
|