Found by running the round-8 fix in the real container instead of trusting the
unit test: a directory created 2ms AFTER `_PROCESS_START` was stamped with an
mtime 2ms BEFORE it, so the sweep deleted it as a leftover. The two sides come
from different clocks — a file's mtime from the kernel's coarse clock (one timer
tick of lag), `time.time()` from the fine one — and the unit test could not see it
because it supplies an artificial cutoff.
The window is small and lands exactly where it hurts: the sweep runs at boot, so
the session at risk is one started in the first instants after startup — the case
the guard exists for. Keep-side slack of 2s; the cost is that a leftover from the
last seconds before a restart survives until the next one.
Verified in the container: a backdated leftover is swept, a directory created by
this run is kept, and a registered live session with an old mtime is kept — 1 of 3.
Test pins the skew (mutation-checked: with the grace at 0 it goes red).
The worst one was, again, the previous round's own fix.
- Round 7 stopped awaiting the HLS sweep so startup could serve immediately — which
also made it run CONCURRENTLY with playback, and `sweep_orphans` snapshotted the
live-session set BEFORE listing the root and rmtree'd outside the lock. Since
`start_session` reuses a directory path for the same (key, offset, tag), a stale
name can become a live session at any moment. Two guards now: nothing whose mtime
is newer than this process's start is ever deleted, and the live check + rmtree
happen together under the lock, one directory at a time.
- The sweep task is awaited after cancel, so shutdown can't leave it pending.
- `_rate_limiter` used a truthiness test on its timestamp, so a `now()` of exactly
0.0 read as "never ran" — unreachable in production, but `now` exists to be
injected and a test clock starting at 0 is the obvious choice.
- The RSS total-outage error now carries the first underlying error: "all N channels
failed" is also what ONE dead feed id looks like on a small instance, and a red
card the user can't act on is its own kind of dishonest.
- The WebKit fullscreen handling moved into `lib/fullscreen` and PlexPlayer uses it
too — it had the same unprefixed-only reads in three places, including an Escape
branch that would have closed the whole player instead of leaving fullscreen.
- The `--max` CSS comment claimed `inset: 0` did the sizing; Tailwind's `w-full` is
still on the element and wins. Comment now states the real mechanism.
Verified in real Chrome (the pane can't composite or do native fullscreen):
- F fills the 1920x889 viewport; the exit pill renders top-right on the letterbox
band and overlaps NO YouTube control — the collision this round suspected does not
reproduce in this embed (its own buttons sit bottom-left / bottom-right).
- Four real ArrowDown presses while maximised: persisted volume 100 -> 80, with the
level flash visible on screen.
- A real click on the exit pill un-maximises and returns focus to the card.
- lib/fullscreen driven from a real click: enter (innerHeight 889 -> 1024), the
change listener fires exactly once per transition, exit returns to 889.
Backend suite 150 -> 158; the new sweep tests are mutation-checked, and they read
their cutoff from the filesystem rather than a clock (the container VM and the
bind-mounted host disagree by enough to make a clock-based assertion flaky).
- the sweep guard anchors the rating_key to digits: the round-2 widening had
degenerated to "anything ending in _<digits>" (backup_2024, release_10)
- RSS counts apply-side failures too, so a read-only database no longer reports
a wholly failed poll as "ok — new=0, failed=0"
- the player reads/writes its volume directly (readAccount/writeAccount): the
persisted-object hook rendered nothing and cost a second write per settle
- new tests: the sweep guard's accept/reject table, and run_ffmpeg's threading
(drain, cancel while silent, stall watchdog, stderr tail on a nonzero exit)
- the breaker sentinel is checked one way (isinstance) at all four sites
- run_rss_poll is typed dict[str, int]
All three new test groups were mutation-checked: reverting each fix turns them
red (or, for the cancel/stall pair, hangs — which is the bug itself).
peter