From 9183173480f8869bad61f71340e07c9edab91f78 Mon Sep 17 00:00:00 2001
From: anaxios <ilguappo@pm.me>
Date: Wed, 14 Aug 2024 16:44:00 -0700
Subject: [PATCH] first

---
 backup.sh | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100755 backup.sh

diff --git a/backup.sh b/backup.sh
new file mode 100755
index 0000000..1d79460
--- /dev/null
+++ b/backup.sh
@@ -0,0 +1,39 @@
+# A script to perform incremental backups using rsync
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+
+readonly KEEP="$3"
+readonly SOURCE_DIR="$1"
+readonly BACKUP_DIR="$2"
+readonly DATETIME="$(date '+%Y-%m-%d_%H:%M:%S')"
+readonly BACKUP_PATH="${BACKUP_DIR}/${DATETIME}"
+readonly LATEST_LINK="$(dirname ${BACKUP_DIR})/latest"
+
+mkdir -p "${BACKUP_DIR}"
+
+rsync -avh --delete \
+    "${SOURCE_DIR}/" \
+    --link-dest "${LATEST_LINK}" \
+    --exclude=".cache" \
+    "${BACKUP_PATH}"
+
+rm -rf "${LATEST_LINK}"
+ln -s "${BACKUP_PATH}" "${LATEST_LINK}"
+
+
+COUNT=$(ls ${BACKUP_DIR} | wc -l)
+
+if [[ ${KEEP} -lt ${COUNT} ]]; then
+
+  TRASH=$(ls ${BACKUP_DIR} | sort -r | tail -n $(( ${COUNT} - ${KEEP} )) )
+
+  for t in ${TRASH}; do
+    rm -rf "${BACKUP_DIR}/${t}"
+    echo "REMOVED: ${BACKUP_DIR}/${t}"
+  done
+
+fi
+