The subtree search returned early whenever it found *any* group member,
so an in-tree stage that was busy or sleeping on a timer masked a
reparented member genuinely parked on the tty.
Checking every member instead would have meant a /proc scan per session
per tick whenever nothing was parked — the common case. ProcGroups
snapshots /proc once per activity pass and indexes by process group, so
the cost is one walk however many sessions the daemon owns, and the
subtree walk disappears: the index is a superset of it.
Also fixes the background-helper test, which had stopped discriminating.
It polled until awaiting_input was true and caught a moment before the
helper spawned, so it passed against a deepest-descendant walk too. It now
waits for the helper to exist first. Both regression tests were re-checked
by patching each old implementation back in.
Reported in review on #51.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
A member of the foreground group can sit outside the pane's subtree: a
stage that forks a terminal-reading child and exits leaves that child
reparented to init while it keeps the foreground pgid. The subtree search
finds nothing and the session reads as idle.
An empty subtree result now falls back to scanning /proc for the group.
The scan only runs when the cheap path found nothing, so the common case
still costs a handful of reads.
Tested at the level it can honestly be tested: scan_for_pgid against this
process's own group, and against a group that cannot exist. Reproducing
the reparenting scenario end to end is not practical — setpgid across
sessions is EPERM, and from a shell the window closes as soon as the shell
reclaims the terminal.
Reported in review on #51.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
tpgid names a process *group*, not a process. Its leader can exit while
another member still holds the terminal — a foreground pipeline whose
first stage finished — and then /proc/<tpgid> does not exist, so reading
it directly reported the session idle while it sat waiting on the user.
awaiting_input now searches the pane's subtree for live processes whose
pgrp matches, and asks whether any is parked on the tty. Members stay in
that subtree because their parent shell is alive, so they never reparent.
Reported in review on #51. The regression test needs an interactive shell
— job control is what puts a pipeline in its own process group — and waits
for the leader to actually be gone before asserting, otherwise it passes
against the old lookup while the shell is still foreground.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
awaiting_input walked `children` to the deepest descendant, guessing that
the newest child is the foreground one. An agent that starts a background
helper and then blocks on read landed on the helper, so a session genuinely
waiting on the user was reported as idle.
tpgid in /proc/<pid>/stat is the kernel's own answer — the foreground
process group of the controlling terminal — and the group leader's pid is
the group id. One field read replaces a 64-deep walk.
Adds tests/activity.rs: the first end-to-end coverage of this pipeline,
which had none. The background-helper case fails against the old walk and
passes against tpgid.
Also makes the attach handler subscribe before upgrading. Checking
existence and then subscribing inside the callback left a window for the
liveness watcher to reap in between, which attach::serve compensated for
with a clean close; acquiring the subscription up front means the 404 and
the subscription are one step and the window does not exist.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Add an orthogonal activity dimension to sessions, inferred entirely from
structured tmux/`/proc` state — no PTY byte-stream parsing, no work on the
attach hot path.
Protocol: `ActivityState` enum (Active/Idle/AwaitingInput) + three additive,
serde-defaulted `Session` fields (`foreground`, `activity`, `last_activity_at`)
so the snapshot/diff flow stays forward-compatible with older daemons.
Detection (piggybacks the existing ~2s liveness tick, no new timer):
- foreground command via `tmux list-panes -F '#{pane_pid} #{pane_current_command}
#{pane_tty}'`;
- quiescence from a per-`PtyBridge` last-read `Instant`, bumped in `run_reader`;
- AwaitingInput via best-effort `/proc` walk to the deepest descendant: state
`S` + a non-timer `wchan` + an stdio fd on the pane tty. (`/proc/pid/syscall`
is ptrace-gated and unreadable for own sessions, so `wchan` distinguishes a
blocking read from a plain `sleep`.)
- combine: recent output → Active; else input-blocked → AwaitingInput; else
Idle. Emit `SessionUpdated` only on (activity, foreground) change — no diff
storms at steady state.
`maestro list` gains an ACTIVITY column and shows the live foreground. Pure
combine/parse logic is unit-tested; an e2e asserts `cat` → AwaitingInput and
`sleep` → Idle with correct foreground against real tmux.
Closes#18Closes#8
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
naps62-yoloandClaude Opus 4.8