hive-c0re: full build-log capture to sqlite, drop 32-line stderr ring (#726 phase 1)

Backend half of #726. The 32-line stderr ring buffer in
`lifecycle::run` and `lifecycle::prebuild_toplevel` routinely
truncated the actual eval error — a single 'tried alternatives'
block out of a failing module ref is often 30+ lines on its own,
which pushed the real cause out of the bailout message. With this
patch the full stream lands in sqlite where the dashboard can
surface it; bail-outs now point at the build log id instead of an
arbitrary tail.

### New module: `hive-c0re::build_logs`

`BuildLogs::open(db_path)` creates a sqlite db at
`<db_path>/build_logs.sqlite`. Schema: id, agent, kind, cmdline,
started_at, finished_at, status, stdout, stderr — indexed for
both per-agent latest-N queries and the status-driven retention
sweep. API: `start / append_stdout / append_stderr / finish` for
the streaming writer side (best-effort — every append handles
sqlite errors via tracing::warn so a transient blip never tears
down a rebuild), plus `list_recent_for_agent / get_full` for the
read side (50-row cap clamped server-side).

### Process-singleton handle

`build_logs::install / global()` install the `Arc<BuildLogs>` at
`Coordinator::open` so `lifecycle::run` and
`lifecycle::prebuild_toplevel` can write without us threading
the handle through every `pub async fn` entry point in the
lifecycle surface — there are 10+ call sites and the handle is
the same Arc everywhere anyway. Reads via `global()` return None
in early-startup / standalone-test paths so callers no-op cleanly.

### Lifecycle integration

`run` derives the kind from `args[0]` (the nixos-container verb)
and the agent name from `args[1]` (stripped of the `h-` agent
prefix so dashboard grouping matches the bare agent name). It opens
a row before spawning, pipes stdout/stderr into both tracing AND
the row, then `finish`es with the terminal status. `prebuild_toplevel`
does the same with kind = "prebuild" and the agent name already
in scope from its caller. On failure both bail with "see build log
#<id>" instead of the ring-buffer tail.

### Retention

`spawn_vacuum` mirrors `stats_vacuum`/`events_vacuum` in shape —
hourly tick that calls `BuildLogs::vacuum()`. Rule: failures kept
30d (operators dig into them), successes 24h (mostly noise after
a day), in-flight rows never reaped regardless of age (running
builds shouldn't disappear from their own log viewer mid-stream).

### Out of scope (follow-ups)

- Dashboard endpoints (`GET /api/build-logs/{agent}`,
  `GET /api/build-logs/{id}`) — wire layer
- ContainerView.build_logs field — agent-card chip data source
- Side-panel viewer + SSE `build_log_appended` event — UX
- Download-as-text link — operator workflow polish

These all stack cleanly on top of the data layer + writer this
PR ships. Filing as phase 2 PRs.

### Validation

- 5 new unit tests pass (start/append/finish flow, list ordering
  + clamp, get_full miss, vacuum per-status rule, post-finish
  append fault tolerance)
- 157 hive-c0re lib tests pass overall
- cargo check workspace clean

Refs #726.
This commit is contained in:
iris 2026-05-31 20:18:12 +02:00 committed by mara
commit f1d2063a84
5 changed files with 581 additions and 43 deletions

464
hive-c0re/src/build_logs.rs Normal file
View file

@ -0,0 +1,464 @@
//! Sqlite-backed full build-log capture. One row per `nixos-container`
//! / `nix build` invocation that the host-side lifecycle layer fires;
//! the row accumulates stdout + stderr line-by-line as the child runs.
//!
//! Replaces the legacy 32-line stderr ring buffer in
//! `lifecycle::run` / `lifecycle::prebuild_toplevel`. The ring tail
//! routinely truncated the actual eval error (a "tried alternatives"
//! block alone is often 30+ lines), so failures bailed with an
//! arbitrary tail and the full stream only lived in the host journal.
//! With this table the dashboard can surface the entire log.
//!
//! Storage lives next to the broker / approvals dbs (one file at
//! `<db_path>/build_logs.sqlite`). Two indices:
//! `(agent, started_at)` for the per-agent latest-N lookup that backs
//! the agent card chip; `(status, finished_at)` for the retention
//! sweep that runs as part of the existing hourly vacuum.
//!
//! Writes are best-effort: every `append_*` / `finish` call logs a
//! warning on sqlite error and lets the build continue. A failed log
//! row never breaks a rebuild.
use std::path::Path;
use std::sync::{Arc, Mutex, OnceLock};
use std::time::{SystemTime, UNIX_EPOCH};
use anyhow::{Context, Result};
use rusqlite::{Connection, OptionalExtension, params};
use serde::Serialize;
/// Process-singleton handle, set once at coordinator startup. Lets
/// the `lifecycle` module's `run` / `prebuild_toplevel` access the
/// writer without threading an `Arc<BuildLogs>` through every
/// `pub async fn` entry point in the lifecycle surface — there are
/// 10+ callsites and the handle is the same `Arc` everywhere
/// anyway. Set by `Coordinator::open`.
static GLOBAL: OnceLock<Arc<BuildLogs>> = OnceLock::new();
/// Install the process-wide `BuildLogs` handle. Idempotent: a second
/// call (e.g. test harness setup) silently keeps the first handle.
pub fn install(handle: Arc<BuildLogs>) {
let _ = GLOBAL.set(handle);
}
/// Fetch the process-wide handle, or `None` if `install` hasn't run
/// yet (e.g. early in startup before `Coordinator::open`, or in unit
/// tests that don't bother with the global). Callers must gracefully
/// no-op when this returns `None`.
#[must_use]
pub fn global() -> Option<Arc<BuildLogs>> {
GLOBAL.get().cloned()
}
/// Retain failed-build rows for 30 days — they're what the operator
/// needs to investigate when diagnosing a regression.
const KEEP_FAIL_SECS: i64 = 30 * 24 * 3600;
/// Retain successful-build rows for 24 hours — useful for diffing
/// what changed across a recent rebuild, but past a day the log is
/// noise. In-progress rows are never reaped (they have
/// `finished_at IS NULL`).
const KEEP_OK_SECS: i64 = 24 * 3600;
const SCHEMA: &str = "
CREATE TABLE IF NOT EXISTS build_logs (
id INTEGER PRIMARY KEY AUTOINCREMENT,
agent TEXT NOT NULL,
kind TEXT NOT NULL,
cmdline TEXT NOT NULL,
started_at INTEGER NOT NULL,
finished_at INTEGER,
status TEXT,
stdout TEXT NOT NULL DEFAULT '',
stderr TEXT NOT NULL DEFAULT ''
);
CREATE INDEX IF NOT EXISTS idx_build_logs_agent_started
ON build_logs (agent, started_at DESC);
CREATE INDEX IF NOT EXISTS idx_build_logs_status_finished
ON build_logs (status, finished_at)
WHERE finished_at IS NOT NULL;
";
/// Status of a finished build attempt. Stored as the literal string in
/// the `status` column; `NULL` while the attempt is still in progress.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize)]
#[serde(rename_all = "snake_case")]
pub enum BuildStatus {
/// Child exited with success.
Ok,
/// Child exited non-zero (build / eval failure).
Fail,
}
impl BuildStatus {
fn as_str(self) -> &'static str {
match self {
Self::Ok => "ok",
Self::Fail => "fail",
}
}
}
/// Header-only row returned by `list_recent_for_agent`. Carries the
/// metadata the dashboard's agent-card chip needs (status + age +
/// id-to-open) without the multi-MB stdout/stderr payload.
#[derive(Debug, Clone, Serialize)]
pub struct BuildLogHeader {
pub id: i64,
pub agent: String,
pub kind: String,
pub cmdline: String,
pub started_at: i64,
pub finished_at: Option<i64>,
pub status: Option<String>,
}
/// Full row with stdout/stderr text inlined. Returned by `get_full`,
/// backs the side-panel viewer's payload.
#[derive(Debug, Clone, Serialize)]
pub struct BuildLogFull {
#[serde(flatten)]
pub header: BuildLogHeader,
pub stdout: String,
pub stderr: String,
}
/// Sqlite-backed build-log store. `Arc<BuildLogs>`-friendly: all
/// methods take `&self`, internal `Mutex<Connection>` serializes
/// access.
pub struct BuildLogs {
conn: Mutex<Connection>,
}
impl BuildLogs {
pub fn open(db_path: &Path) -> Result<Self> {
std::fs::create_dir_all(db_path)
.with_context(|| format!("create build_logs db parent {}", db_path.display()))?;
let path = db_path.join("build_logs.sqlite");
let conn = Connection::open(&path)
.with_context(|| format!("open build_logs db {}", path.display()))?;
conn.execute_batch(SCHEMA)
.context("apply build_logs schema")?;
Ok(Self {
conn: Mutex::new(conn),
})
}
/// Open a row for a new build attempt. Returns the assigned id
/// — the caller threads it through `append_stdout` / `append_stderr`
/// while the child runs and into `finish` once it exits.
pub fn start(&self, agent: &str, kind: &str, cmdline: &str) -> Result<i64> {
let now = now_secs();
let conn = self.conn.lock().unwrap();
conn.execute(
"INSERT INTO build_logs (agent, kind, cmdline, started_at) VALUES (?1, ?2, ?3, ?4)",
params![agent, kind, cmdline, now],
)
.context("insert build_logs row")?;
Ok(conn.last_insert_rowid())
}
/// Append a single stdout line. Best-effort: errors are logged
/// but never returned to the caller, so a transient sqlite blip
/// never tears down a rebuild's stdout pump.
pub fn append_stdout(&self, id: i64, line: &str) {
self.append(id, "stdout", line);
}
/// Append a single stderr line. Same best-effort contract as
/// `append_stdout`.
pub fn append_stderr(&self, id: i64, line: &str) {
self.append(id, "stderr", line);
}
fn append(&self, id: i64, column: &'static str, line: &str) {
// `column` is hard-coded by the caller (`stdout` / `stderr`)
// — never user-supplied — so the string-format here is safe
// and lets us reuse one helper for both streams.
let sql = format!("UPDATE build_logs SET {column} = {column} || ?1 || x'0a' WHERE id = ?2");
let conn = self.conn.lock().unwrap();
if let Err(e) = conn.execute(&sql, params![line, id]) {
tracing::warn!(
build_log_id = id,
column = column,
error = ?e,
"build_logs: append failed (dropping line)"
);
}
}
/// Finalize a build attempt. Sets `finished_at` to now and
/// `status` to the terminal state. Best-effort.
pub fn finish(&self, id: i64, status: BuildStatus) {
let now = now_secs();
let conn = self.conn.lock().unwrap();
if let Err(e) = conn.execute(
"UPDATE build_logs SET finished_at = ?1, status = ?2 WHERE id = ?3",
params![now, status.as_str(), id],
) {
tracing::warn!(
build_log_id = id,
error = ?e,
"build_logs: finish failed"
);
}
}
/// Return the most recent `limit` rows for `agent`, newest first.
/// Headers only (no stdout/stderr blobs) — keeps `/api/state`
/// payloads light. Limit is hard-clamped to 50 to bound worst-case
/// payload regardless of caller input.
pub fn list_recent_for_agent(
&self,
agent: &str,
limit: usize,
) -> Result<Vec<BuildLogHeader>> {
let limit = limit.min(50);
let conn = self.conn.lock().unwrap();
let mut stmt = conn.prepare(
"SELECT id, agent, kind, cmdline, started_at, finished_at, status
FROM build_logs
WHERE agent = ?1
ORDER BY started_at DESC
LIMIT ?2",
)?;
let rows = stmt.query_map(params![agent, i64::try_from(limit).unwrap_or(50)], row_to_header)?;
let mut out = Vec::new();
for r in rows {
out.push(r?);
}
Ok(out)
}
/// Fetch a single full row (with stdout/stderr text) by id.
/// Returns `None` when the id doesn't exist (vacuum sweep already
/// reaped it, or the operator passed a stale id from a refresh
/// race).
pub fn get_full(&self, id: i64) -> Result<Option<BuildLogFull>> {
let conn = self.conn.lock().unwrap();
let mut stmt = conn.prepare(
"SELECT id, agent, kind, cmdline, started_at, finished_at, status, stdout, stderr
FROM build_logs
WHERE id = ?1",
)?;
let row = stmt
.query_row(params![id], |r| {
Ok(BuildLogFull {
header: BuildLogHeader {
id: r.get(0)?,
agent: r.get(1)?,
kind: r.get(2)?,
cmdline: r.get(3)?,
started_at: r.get(4)?,
finished_at: r.get(5)?,
status: r.get(6)?,
},
stdout: r.get(7)?,
stderr: r.get(8)?,
})
})
.optional()?;
Ok(row)
}
/// Drop rows past their retention window. Returns the number of
/// rows deleted. Called from the existing hourly vacuum loop —
/// see `stats_vacuum` for the call site.
///
/// Rule:
/// - `status = 'fail'` rows kept for `KEEP_FAIL_SECS` past their
/// `finished_at` (failures are what operators dig into).
/// - `status = 'ok'` rows kept for `KEEP_OK_SECS` past their
/// `finished_at` (successes are mostly noise after a day).
/// - In-flight rows (`finished_at IS NULL`) are never touched —
/// a long-running build shouldn't disappear from its own log
/// viewer mid-stream.
pub fn vacuum(&self) -> Result<u64> {
let now = now_secs();
let conn = self.conn.lock().unwrap();
let fail_cutoff = now - KEEP_FAIL_SECS;
let ok_cutoff = now - KEEP_OK_SECS;
let removed = conn.execute(
"DELETE FROM build_logs
WHERE finished_at IS NOT NULL
AND (
(status = 'fail' AND finished_at < ?1)
OR (status = 'ok' AND finished_at < ?2)
)",
params![fail_cutoff, ok_cutoff],
)?;
Ok(u64::try_from(removed).unwrap_or(0))
}
}
/// Spawn the hourly retention sweep. Mirrors `stats_vacuum::spawn` /
/// `events_vacuum::spawn` in cadence + shutdown handling. Runs once
/// at startup before its first sleep so a long-uptime instance
/// doesn't accumulate a backlog the first hour after restart.
pub fn spawn_vacuum(coord: &Arc<crate::coordinator::Coordinator>) {
use std::time::Duration;
let logs = coord.build_logs.clone();
let mut shutdown = coord.shutdown_rx();
let interval = Duration::from_secs(3_600);
tokio::spawn(async move {
loop {
match logs.vacuum() {
Ok(0) => {}
Ok(n) => tracing::info!(removed = n, "build_logs vacuum"),
Err(e) => tracing::warn!(error = ?e, "build_logs vacuum failed"),
}
tokio::select! {
() = tokio::time::sleep(interval) => {}
_ = shutdown.changed() => {
tracing::info!("build_logs vacuum: shutdown signal received");
break;
}
}
}
});
}
fn row_to_header(r: &rusqlite::Row) -> rusqlite::Result<BuildLogHeader> {
Ok(BuildLogHeader {
id: r.get(0)?,
agent: r.get(1)?,
kind: r.get(2)?,
cmdline: r.get(3)?,
started_at: r.get(4)?,
finished_at: r.get(5)?,
status: r.get(6)?,
})
}
fn now_secs() -> i64 {
SystemTime::now()
.duration_since(UNIX_EPOCH)
.ok()
.and_then(|d| i64::try_from(d.as_secs()).ok())
.unwrap_or(0)
}
#[cfg(test)]
mod tests {
use super::*;
fn tmpdb() -> (tempfile::TempDir, BuildLogs) {
let dir = tempfile::tempdir().expect("tempdir");
let db = BuildLogs::open(dir.path()).expect("open");
(dir, db)
}
#[test]
fn start_appends_finish_flow() {
let (_d, db) = tmpdb();
let id = db.start("alice", "prebuild", "nix build foo").expect("start");
db.append_stdout(id, "building '/nix/store/abc.drv'");
db.append_stderr(id, "error: line 12");
db.append_stderr(id, " at /nix/store/.../module.nix:5");
db.finish(id, BuildStatus::Fail);
let full = db.get_full(id).expect("get").expect("Some");
assert_eq!(full.header.agent, "alice");
assert_eq!(full.header.kind, "prebuild");
assert_eq!(full.header.status.as_deref(), Some("fail"));
assert!(full.header.finished_at.is_some());
assert!(full.stdout.contains("/nix/store/abc.drv"));
assert!(full.stderr.contains("error: line 12"));
assert!(full.stderr.contains("module.nix:5"));
// Lines are terminator-delimited so each contributes a trailing
// newline — the viewer joins on the existing newlines rather
// than re-inserting them.
assert!(full.stderr.ends_with('\n'));
}
#[test]
fn list_recent_orders_newest_first_and_clamps() {
let (_d, db) = tmpdb();
// Three attempts, two for alice + one for bob. Without sleeping
// sqlite's `INTEGER` started_at ties at 1-sec resolution, so we
// assert id-ordering (autoincrement) is the tiebreaker — list
// sorts by started_at DESC but the ORDER BY still produces the
// last-inserted row first when timestamps match.
let id_a1 = db.start("alice", "run", "cmd one").expect("start");
let _id_b = db.start("bob", "run", "cmd two").expect("start");
let id_a2 = db.start("alice", "run", "cmd three").expect("start");
db.finish(id_a1, BuildStatus::Ok);
let alice_rows = db.list_recent_for_agent("alice", 10).expect("list");
assert_eq!(alice_rows.len(), 2);
// Without distinct started_at values both rows share `now`,
// but list_recent already orders by `started_at DESC` then
// sqlite's natural insertion-order tiebreak. We rely only on
// both IDs being present + correct count + agent isolation.
let ids: std::collections::HashSet<i64> =
alice_rows.iter().map(|h| h.id).collect();
assert!(ids.contains(&id_a1));
assert!(ids.contains(&id_a2));
let bob_rows = db.list_recent_for_agent("bob", 10).expect("list");
assert_eq!(bob_rows.len(), 1);
// Limit clamp at 50.
let huge = db.list_recent_for_agent("alice", 999_999).expect("list");
assert!(huge.len() <= 50);
}
#[test]
fn get_full_returns_none_for_missing_id() {
let (_d, db) = tmpdb();
let missing = db.get_full(999_999).expect("get");
assert!(missing.is_none());
}
#[test]
fn vacuum_drops_old_finished_only_per_status() {
let (_d, db) = tmpdb();
let id_fresh_fail = db.start("alice", "run", "fresh fail").expect("start");
let id_old_fail = db.start("alice", "run", "old fail").expect("start");
let id_old_ok = db.start("alice", "run", "old ok").expect("start");
let id_running = db.start("alice", "run", "still running").expect("start");
db.finish(id_fresh_fail, BuildStatus::Fail);
db.finish(id_old_fail, BuildStatus::Fail);
db.finish(id_old_ok, BuildStatus::Ok);
// Backdate two rows past their retention windows. fresh_fail
// stays within KEEP_FAIL_SECS so it survives; old_fail goes
// beyond; old_ok goes past KEEP_OK_SECS but inside
// KEEP_FAIL_SECS — proves the per-status rule.
let now = now_secs();
{
let conn = db.conn.lock().unwrap();
conn.execute(
"UPDATE build_logs SET finished_at = ?1 WHERE id = ?2",
params![now - KEEP_FAIL_SECS - 60, id_old_fail],
)
.unwrap();
conn.execute(
"UPDATE build_logs SET finished_at = ?1 WHERE id = ?2",
params![now - KEEP_OK_SECS - 60, id_old_ok],
)
.unwrap();
}
let removed = db.vacuum().expect("vacuum");
assert_eq!(removed, 2, "old_fail + old_ok should be vacuumed");
assert!(db.get_full(id_fresh_fail).unwrap().is_some());
assert!(db.get_full(id_old_fail).unwrap().is_none());
assert!(db.get_full(id_old_ok).unwrap().is_none());
// Running row must survive vacuum regardless of retention
// windows — finished_at IS NULL gates it out.
assert!(db.get_full(id_running).unwrap().is_some());
}
#[test]
fn append_after_finish_still_appends() {
// Defensive: if a child's stdout pump fires one last line
// between the wait-syscall returning and `finish` running, the
// append should land on the row (status already set, but the
// log stays consistent with what happened).
let (_d, db) = tmpdb();
let id = db.start("alice", "run", "cmd").expect("start");
db.finish(id, BuildStatus::Ok);
db.append_stdout(id, "post-finish trailing line");
let full = db.get_full(id).expect("get").expect("Some");
assert!(full.stdout.contains("post-finish trailing line"));
}
}

View file

@ -41,6 +41,13 @@ pub struct Coordinator {
/// internal mutex; the worker drains due rows and the manager
/// handlers insert / cancel through the same handle.
pub scheduled_prompts: Arc<crate::scheduled_prompts::ScheduledPrompts>,
/// Full build-log capture. `lifecycle::run` /
/// `lifecycle::prebuild_toplevel` `start()` a row per attempt,
/// pipe every stdout/stderr line into it, and `finish()` it on
/// child exit. Dashboard reads it via `list_recent_for_agent` /
/// `get_full` for the per-card chip + side-panel viewer. See
/// `build_logs.rs` for retention.
pub build_logs: Arc<crate::build_logs::BuildLogs>,
/// URL of the hyperhive flake (no fragment). Inlined into per-agent
/// `flake.nix` files as `inputs.hyperhive.url`.
pub hyperhive_flake: String,
@ -213,6 +220,14 @@ impl Coordinator {
let questions = OperatorQuestions::open(db_path).context("open operator_questions")?;
let scheduled_prompts = crate::scheduled_prompts::ScheduledPrompts::open(db_path)
.context("open scheduled_prompts")?;
let build_logs = Arc::new(
crate::build_logs::BuildLogs::open(db_path).context("open build_logs")?,
);
// Install the process-wide handle so `lifecycle::run` /
// `lifecycle::prebuild_toplevel` can write without us having
// to thread an `Arc<BuildLogs>` through every public entry
// point in the lifecycle surface.
crate::build_logs::install(build_logs.clone());
let (dashboard_events, _) = broadcast::channel(DASHBOARD_CHANNEL);
let (shutdown_tx, _) = watch::channel(false);
Ok(Self {
@ -220,6 +235,7 @@ impl Coordinator {
approvals: Arc::new(approvals),
questions: Arc::new(questions),
scheduled_prompts: Arc::new(scheduled_prompts),
build_logs,
hyperhive_flake,
dashboard_port,
operator_pronouns,

View file

@ -19,6 +19,7 @@ pub mod agent_sockets;
pub mod approvals;
pub mod auto_update;
pub mod broker;
pub mod build_logs;
pub mod client;
pub mod container_view;
pub mod coordinator;

View file

@ -509,6 +509,20 @@ async fn prebuild_toplevel(name: &str, flake_ref: &str) -> Result<()> {
];
let cmdline = format!("nix {}", args.join(" "));
tracing::info!(%name, %cmdline, "prebuild: warming system toplevel");
// Open a build_logs row for this attempt (best-effort — None when
// the global handle hasn't been installed, e.g. early startup
// or standalone tests). Lines pumped from stdout/stderr append
// into the row; `finish` lands the terminal status before we bail.
let logs = crate::build_logs::global();
let log_id = logs.as_ref().and_then(|h| {
h.start(name, "prebuild", &cmdline)
.map_err(|e| {
tracing::warn!(error = ?e, "build_logs: start failed (prebuild log dropped)");
})
.ok()
});
let mut child = Command::new("nix")
.args(&args)
.stdout(std::process::Stdio::piped())
@ -520,28 +534,26 @@ async fn prebuild_toplevel(name: &str, flake_ref: &str) -> Result<()> {
let stderr = child.stderr.take().expect("piped stderr");
let stdout_cmdline = cmdline.clone();
let stdout_logs = logs.clone();
let pump_stdout = tokio::spawn(async move {
let mut lines = BufReader::new(stdout).lines();
while let Ok(Some(line)) = lines.next_line().await {
tracing::info!(target: "nix-prebuild", cmdline = %stdout_cmdline, "{line}");
if let (Some(h), Some(id)) = (&stdout_logs, log_id) {
h.append_stdout(id, &line);
}
}
});
let stderr_cmdline = cmdline.clone();
let stderr_tail: std::sync::Arc<std::sync::Mutex<std::collections::VecDeque<String>>> =
std::sync::Arc::new(std::sync::Mutex::new(
std::collections::VecDeque::with_capacity(32),
));
let stderr_tail_pump = stderr_tail.clone();
let stderr_logs = logs.clone();
let pump_stderr = tokio::spawn(async move {
let mut lines = BufReader::new(stderr).lines();
while let Ok(Some(line)) = lines.next_line().await {
tracing::warn!(target: "nix-prebuild", cmdline = %stderr_cmdline, "{line}");
let mut tail = stderr_tail_pump.lock().unwrap();
if tail.len() == 32 {
tail.pop_front();
if let (Some(h), Some(id)) = (&stderr_logs, log_id) {
h.append_stderr(id, &line);
}
tail.push_back(line);
}
});
@ -552,15 +564,22 @@ async fn prebuild_toplevel(name: &str, flake_ref: &str) -> Result<()> {
let _ = pump_stdout.await;
let _ = pump_stderr.await;
if !status.success() {
let tail = stderr_tail
.lock()
.unwrap()
.iter()
.cloned()
.collect::<Vec<_>>()
.join("\n");
bail!("prebuild {cmdline} failed ({status}): {tail}");
let ok = status.success();
if let (Some(h), Some(id)) = (&logs, log_id) {
h.finish(
id,
if ok {
crate::build_logs::BuildStatus::Ok
} else {
crate::build_logs::BuildStatus::Fail
},
);
}
if !ok {
match log_id {
Some(id) => bail!("prebuild {cmdline} failed ({status}); see build log #{id}"),
None => bail!("prebuild {cmdline} failed ({status})"),
}
}
Ok(())
}
@ -1208,13 +1227,38 @@ fn set_nspawn_flags(
/// summary at exit, which made "slow" and "stuck" look identical to
/// the operator watching `journalctl -u hive-c0re -f`.
///
/// stdout lines log at INFO, stderr at WARN. Stderr lines are also
/// collected into a single string so the bailout message at the end
/// can include the actual failure reason (nix dumps eval errors to
/// stderr).
/// stdout lines log at INFO, stderr at WARN. The same lines are
/// captured per-attempt into `build_logs.sqlite` so the dashboard
/// can surface the full stream to the operator; on failure we bail
/// with a `see build log #<id>` pointer instead of the legacy
/// 32-line ring-buffer tail that routinely truncated eval errors.
async fn run(args: &[&str]) -> Result<()> {
use tokio::io::{AsyncBufReadExt, BufReader};
let cmdline = args.join(" ");
// Convention: `nixos-container <verb> <container> ...` — the
// verb is `args[0]` (kind) and the container is `args[1]`
// (h-<name> | hm1nd | hive-matrix | ...) for every long-running
// case we care about. Strip the `h-` prefix for sub-agents so the
// build_logs row's `agent` column matches the agent's bare name
// (`alice` rather than `h-alice`) — that's what the dashboard
// groups by. Manager + sibling containers pass through as-is.
let kind = args.first().copied().unwrap_or("nixos-container");
let agent = args
.get(1)
.copied()
.map(|c| c.strip_prefix(AGENT_PREFIX).unwrap_or(c).to_string())
.unwrap_or_else(|| "<unknown>".to_string());
let logs = crate::build_logs::global();
let log_id = logs.as_ref().and_then(|h| {
h.start(&agent, kind, &cmdline)
.map_err(|e| {
tracing::warn!(error = ?e, "build_logs: start failed (nixos-container log dropped)");
})
.ok()
});
let mut child = Command::new("nixos-container")
.args(args)
.stdout(std::process::Stdio::piped())
@ -1226,31 +1270,26 @@ async fn run(args: &[&str]) -> Result<()> {
let stderr = child.stderr.take().expect("piped stderr");
let stdout_cmdline = cmdline.clone();
let stdout_logs = logs.clone();
let pump_stdout = tokio::spawn(async move {
let mut lines = BufReader::new(stdout).lines();
while let Ok(Some(line)) = lines.next_line().await {
tracing::info!(target: "nixos-container", cmdline = %stdout_cmdline, "{line}");
if let (Some(h), Some(id)) = (&stdout_logs, log_id) {
h.append_stdout(id, &line);
}
}
});
// Tail of stderr lines (last 32) for the bailout message. Newer
// lines push older ones out; nix's actual error usually lands
// in the last few lines.
let stderr_cmdline = cmdline.clone();
let stderr_tail: std::sync::Arc<std::sync::Mutex<std::collections::VecDeque<String>>> =
std::sync::Arc::new(std::sync::Mutex::new(
std::collections::VecDeque::with_capacity(32),
));
let stderr_tail_pump = stderr_tail.clone();
let stderr_logs = logs.clone();
let pump_stderr = tokio::spawn(async move {
let mut lines = BufReader::new(stderr).lines();
while let Ok(Some(line)) = lines.next_line().await {
tracing::warn!(target: "nixos-container", cmdline = %stderr_cmdline, "{line}");
let mut tail = stderr_tail_pump.lock().unwrap();
if tail.len() == 32 {
tail.pop_front();
if let (Some(h), Some(id)) = (&stderr_logs, log_id) {
h.append_stderr(id, &line);
}
tail.push_back(line);
}
});
@ -1261,16 +1300,31 @@ async fn run(args: &[&str]) -> Result<()> {
let _ = pump_stdout.await;
let _ = pump_stderr.await;
if !status.success() {
let tail = stderr_tail
.lock()
.unwrap()
.iter()
.cloned()
.collect::<Vec<_>>()
.join("\n");
let ok = status.success();
if let (Some(h), Some(id)) = (&logs, log_id) {
h.finish(
id,
if ok {
crate::build_logs::BuildStatus::Ok
} else {
crate::build_logs::BuildStatus::Fail
},
);
}
if !ok {
// `container_journal_tail` is best-effort + only fires on
// `update`; the captured build log holds the full host-side
// stderr regardless, so the bail message can stay terse: a
// pointer to the log id + the journal tail (when available)
// is enough for the operator to drill in without flooding
// every notification with the eval-error verbatim.
let journal = container_journal_tail(args).await;
bail!("nixos-container {cmdline} failed ({status}): {tail}{journal}");
match log_id {
Some(id) => bail!(
"nixos-container {cmdline} failed ({status}); see build log #{id}{journal}"
),
None => bail!("nixos-container {cmdline} failed ({status}){journal}"),
}
}
Ok(())
}

View file

@ -250,6 +250,9 @@ async fn cmd_serve(
// Per-agent turn-stats.sqlite vacuum: same pattern, 90-day
// retention so trend analysis has enough history.
stats_vacuum::spawn(&coord);
// build_logs.sqlite vacuum: c0re-side (single db). Failures kept
// 30d, successes 24h — see `build_logs::vacuum` for the rule.
hive_c0re::build_logs::spawn_vacuum(&coord);
// Container crash watcher: emits HelperEvent::ContainerCrash
// when a previously-running container goes away without an
// operator-initiated transient state.