Added helper scripts to safely compress logs with xz

compress_logs.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+ubat=$(jq '.u_bat*1000 | floor' < /tmp/solardata.json)
+ubat_thr=27400
+
+if [ "$ubat" -lt "$ubat_thr" ]; then
+	echo "Battery voltage ($ubat mV) is below threshold ($ubat_thr mV). Skipping compression."
+	exit
+fi
+
+find -name \*.csv -mtime +3 | xargs -P3 -n1 nice -n 19 ./xz_safe.sh

xz_safe.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+
+set -euo pipefail
+
+INPUT="$1"
+OUTPUT="$INPUT.xz"
+
+xz --keep "$INPUT"
+sync
+if xz -t "$OUTPUT"; then
+	rm "$INPUT"
+else
+	echo "Test of '$OUTPUT' failed!"
+fi