From daf09961389dd422581d73a2002e838bf5fd2c27 Mon Sep 17 00:00:00 2001
From: Thomas Kolb <cfr34k-git@tkolb.de>
Date: Sun, 2 Jul 2023 16:41:37 +0200
Subject: [PATCH] Added helper scripts to safely compress logs with xz

---
 compress_logs.sh | 11 +++++++++++
 xz_safe.sh       | 14 ++++++++++++++
 2 files changed, 25 insertions(+)
 create mode 100755 compress_logs.sh
 create mode 100755 xz_safe.sh

diff --git a/compress_logs.sh b/compress_logs.sh
new file mode 100755
index 0000000..1255664
--- /dev/null
+++ b/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
diff --git a/xz_safe.sh b/xz_safe.sh
new file mode 100755
index 0000000..785dade
--- /dev/null
+++ b/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