add rotate.sh

.gitignore

@@ -5,3 +5,4 @@ cheap_slot_data.json
 solcast_data.json
 vendor/*
 Gemfile.lock
+logs/*

README.md

@@ -91,6 +91,13 @@ There's also a wrapper script, `octolux.sh`, which will divert output to a logfi
 0,30 * * * * /home/pi/octolux/octolux.sh
 ```
 
+To complement the wrapper script, there's a log rotation script which you can use like this:
+
+```
+59 23 * * * /home/pi/octolux/rotate.sh
+```
+
+This will move the current `octolux.log` into `logs/octolux.YYYYMMDD.log` at 23:59 each night.
 
 
 ## Development Notes

rotate.sh

@@ -0,0 +1,8 @@
+#! /bin/bash
+
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+
+mkdir -p $DIR/logs
+
+DATE=`date +%Y%m%d`
+mv $DIR/octolux.log $DIR/logs/octolux.$DATE.log