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The wheel-write-via-udev approach for charge_control_end_threshold has
been broken since 2026-04-08: the audit-remediation commit added
ACTION=="add" to the rule, but the threshold attribute doesn't exist
yet at the add event on Lenovo, so chmod fails silently and permissions
are never set. moonarch-batsaver-toggle has been returning Permission
denied since.
Replace the udev-rule approach with a pkexec helper:
defaults/bin/moonarch-batsaver-apply privileged: validate + write
defaults/bin/moonarch-batsaver-toggle user: read sysfs, dispatch via pkexec
defaults/bin/moonarch-batsaver-restore boot-time root restore (extracted
from inline ExecStart for clarity)
Default Standard-pkexec prompt — password cached per session for the
~5min auth window; no polkit no-password rule, no privilege escalation
surface from misvalidated input. Same pattern Battery-Health-Charging
GNOME extension uses.
The boot-time restore service now skips the kernel write when the
sysfs value already matches the saved state (Lenovo drivers reject
same-value writes with EINVAL).
DECISIONS.md documents the failure analysis and trade-offs.
CLAUDE.md updated to describe the new flow.
moonarch-doctor: udev-effectiveness check removed.
23 lines
625 B
Bash
Executable File
23 lines
625 B
Bash
Executable File
#!/usr/bin/bash
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# ABOUTME: Toggles battery conservation mode between 80% and 100% charge limit.
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# ABOUTME: Reads sysfs as user, dispatches the privileged write via pkexec.
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THRESHOLD_FILE="/sys/class/power_supply/BAT0/charge_control_end_threshold"
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CONSERVATION_LIMIT=80
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[[ -f "$THRESHOLD_FILE" ]] || exit 1
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CURRENT=$(cat "$THRESHOLD_FILE")
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[[ "$CURRENT" =~ ^[0-9]+$ ]] || exit 1
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if [[ "$CURRENT" -le "$CONSERVATION_LIMIT" ]]; then
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NEW=100
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else
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NEW="$CONSERVATION_LIMIT"
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fi
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pkexec /usr/bin/moonarch-batsaver-apply "$NEW" || exit 1
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# Signal Waybar to refresh the batsaver module (SIGRTMIN+9)
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pkill -RTMIN+9 waybar
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