From f1546487b457e040b0c0d1f708707a08dfcdacd8 Mon Sep 17 00:00:00 2001
From: Andrew Stowell <andrew@digitaladapt.com>
Date: Mon, 27 Apr 2020 16:48:34 +0000
Subject: [PATCH] new prune-old-backups cron script.

---
 config.example.sh          |  6 ++++++
 crons/prune-old-backups.sh | 31 +++++++++++++++++++++++++++++++
 2 files changed, 37 insertions(+)
 create mode 100755 crons/prune-old-backups.sh

diff --git a/config.example.sh b/config.example.sh
index 8f2bd91..88e013b 100644
--- a/config.example.sh
+++ b/config.example.sh
@@ -10,6 +10,12 @@ declare -A STORAGE_ALERT
 # storage in GiB
 STORAGE_ALERT=(["/"]=5)
 
+# when set to 0, all backups are kept
+PRUNE_DOWN_TO=0
+
+# the directory with backups to cleanup
+PRUNE_DIRECTORY="/home/ubuntu/data"
+
 SERVER_DOMAIN="localhost"
 
 DISCORD_SERVER_NAME="<YOUR SERVER>"
diff --git a/crons/prune-old-backups.sh b/crons/prune-old-backups.sh
new file mode 100755
index 0000000..a690fc0
--- /dev/null
+++ b/crons/prune-old-backups.sh
@@ -0,0 +1,31 @@
+#!/bin/bash
+
+LOCATION=`dirname "$0"`
+
+source "${LOCATION}/../config.sh"
+
+# TODO: The maximum number of backups to keep (when set to 0, all backups are kept)
+maxNrOfBackups="$PRUNE_DOWN_TO"
+
+# TODO: The directory where you store the Nextcloud backups
+backupMainDir="$PRUNE_DIRECTORY"
+
+#
+# Delete old backups
+#
+if [ ${maxNrOfBackups} != 0 ]
+then
+    nrOfBackups=$(ls -l ${backupMainDir} | grep -c ^d)
+
+    if [[ ${nrOfBackups} > ${maxNrOfBackups} ]]
+    then
+        echo "Removing old backups..."
+        ls -t ${backupMainDir} | tail -$(( nrOfBackups - maxNrOfBackups )) | while read -r dirToRemove; do
+            echo "${dirToRemove}"
+            rm -r "${backupMainDir}/${dirToRemove:?}"
+            echo "Done"
+            echo
+        done
+    fi
+fi
+