runit

finish

@@ -0,0 +1,9 @@
+#!/bin/sh
+
+[ -d '/var/cache/backlight/' ] || mkdir -p '/var/cache/backlight'
+[ -w '/var/cache/backlight/' ] || chmod 755 '/var/cache/backlight/'
+
+# Save current brightness of each card.
+for card in `find /sys/class/backlight/ -type l`; do
+    cp "$card/brightness" "/var/cache/backlight/$(basename $card)-brightness-old"
+done

install

@@ -0,0 +1,9 @@
+#!/bin/sh
+
+doas mkdir -p /etc/runit/sv/backlight/
+
+doas cp -r run /etc/runit/sv/backlight 
+doas cp -r finish /etc/runit/sv/backlight
+
+doas ln -s /etc/runit/sv/backlight /run/runit/service/
+

run

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+# Restore saved brightness for each card, if any.
+for card in $(find /sys/class/backlight/ -type l); do
+    storage_file="/var/cache/backlight/$(basename $card)-brightness-old"
+    if [ -r "$storage_file" ]; then
+        cp "$storage_file" "$card/brightness"
+    fi
+done
+
+exec chpst -b backlight pause