adjust_shutdown_schedule.sh compared only $1 and $2, so the third value passed
through unchecked in both directions: the morning shutdown window could be
shortened at will while the two evening hours were guarded.
The fix is not the obvious one. day-specific-shutdown-check.sh shuts down while
the clock is BELOW morning_end_minutes, so a LARGER MORNING_END_HOUR means a
longer shutdown window -- stricter. Copying the evening hours' `-gt` comparison
would have ratcheted it backwards and blessed exactly the loosening it was
meant to stop. The guard is `-lt`, and the inversion is now stated in the
header rather than left to be rediscovered.
Two smaller fixes in the same path: validation accepted 24 while its own error
message said 0-23, and the config is now unset before being sourced so an
unreadable file falls back to the documented loosest defaults instead of
inheriting whatever those names last held.
--restore is deliberately unchanged. It looks like a bypass, and it is one, but
it is load-bearing: shutdown_base.json says 21 while the live config is 23,
because the workout reward pushes the schedule later THROUGH --restore.
Bounding it at the base -- as was originally proposed -- would have capped the
reward at 21 and broken a daily flow. Bounding it needs a policy ceiling, which
is a decision, not a refactor.
The script is now sourceable, with the config path overridable, so the ratchet
has tests at all: 20 cases covering both directions, the source-clobber trap,
and the missing/unreadable config fallbacks. A ratchet with no test is how the
$3 gap survived for months.
Verified in a vmbox sandbox as root against a real /etc and a real chattr (the
immutable flag genuinely applied, which a tmpfs cannot do): a stricter write
lands, a looser evening hour is refused, a shortened morning window is refused
with the reason, and --restore still loosens. Not exercised against the host's
own /etc/shutdown-schedule.conf, deliberately.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01B5jMviyk15MKw1PqW1pzKr
