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Garry Tan
e3c235ae5c
design/src/daemon-client.ts implements the CLI side of the daemon lifecycle:
ensureDaemon() (the spawn-or-attach decision), publishBoard(), and the
$D daemon stop|status helpers.
Modeled on browse/src/cli.ts:317-415 — same health-check-first attach,
same fs.openSync('wx') lock, same re-read-state-INSIDE-the-lock guard
against two CLIs both deciding "no daemon, spawn." Two design-specific
safety properties added beyond browse:
1. verifyIdentity before any SIGTERM/SIGKILL. Reads the running process's
cmdline (/proc/PID/cmdline on Linux, `ps -p PID -o command=` on macOS)
and only signals if it contains CMDLINE_MARKER ("gstack-design-daemon",
passed as argv at spawn time). Prevents a stale state file from
causing us to kill an unrelated process that inherited the PID.
2. Refuse-kill-with-active-boards on version mismatch. Browse silently
restarts; here in-memory board history would vanish, so the client
prints a user-actionable WARNING and exit 1 instead. Users explicitly
`$D daemon stop` to override.
Spawn uses Node child_process.spawn (NOT Bun.spawn().unref) because of
the macOS session-detach quirks browse already discovered. Stdio is
redirected to ~/.gstack/design-daemon-startup.log, which the client
tails into stderr if waitForHealthOrError times out — no more silent
"daemon failed for some unknowable reason."
daemon-state.ts gains DESIGN_DAEMON_STATE_FILE env override so tests
can point both client and spawned daemon at a per-test path without a
shared cwd.
design/test/daemon-discovery.test.ts: 17 tests, all green in ~8s. Covers:
spawn-fresh, attach-existing, stale-state-file (pid dead), PID-reuse
safety (uses the test runner's own PID as the bait — verifyIdentity
catches the cmdline mismatch, daemon not signaled), version-mismatch
with/without active boards (the active-boards case runs a subprocess
and asserts exit 1 + WARNING in stderr), publishBoard 200 + 409,
shutdownDaemon refuse/force/unresponsive paths, daemonStatus.
The daemon-discovery suite is split out of daemon.test.ts because each
real spawn costs ~200ms; the in-process daemon.test.ts (30 tests, 70ms)
covers the same handler logic without the spawn overhead.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>