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feat(agent-queue): refuse a second run when a daemon is already active

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cmd_run now checks daemon.pid liveness up front: if a run loop is alive it exits
with an error (protecting the single-launcher invariant locking depends on); a
stale daemon.pid (dead pid) is cleared and the run proceeds.
This commit is contained in:
saravanakumardb1 2026-05-28 22:21:31 -07:00
parent 11935d0539
commit a849a30e11
1 changed files with 8 additions and 0 deletions
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8
agent-queue/agent-queue.sh
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@ -340,6 +340,14 @@ cmd_run() {
*) die "run: unknown arg '$1'";; *) die "run: unknown arg '$1'";;
esac esac
done done
# Refuse to start a second run loop against the same queue — two daemons would
# break the single-launcher invariant that per-cwd locking relies on.
local dpid=""
[[ -f "$STATE/daemon.pid" ]] && dpid=$(cat "$STATE/daemon.pid" 2>/dev/null)
if [[ -n "$dpid" ]] && kill -0 "$dpid" 2>/dev/null; then
die "a run loop is already active (pid $dpid). Use 'stop' first, or a different AGENT_QUEUE_ROOT."
fi
[[ -n "$dpid" ]] && log "clearing stale daemon.pid ($dpid)"
echo "$$" > "$STATE/daemon.pid" echo "$$" > "$STATE/daemon.pid"
trap 'rm -f "$STATE/daemon.pid"; log "run loop stopped"; exit 0' INT TERM trap 'rm -f "$STATE/daemon.pid"; log "run loop stopped"; exit 0' INT TERM
log "run loop started (max=$MAX_CONCURRENCY, default engine=$DEFAULT_ENGINE). Ctrl-C to stop." log "run loop started (max=$MAX_CONCURRENCY, default engine=$DEFAULT_ENGINE). Ctrl-C to stop."