From a5056198ab84d911cf8e242a8886855c81326531 Mon Sep 17 00:00:00 2001
From: Julien Lutran <julien@lutran.fr>
Date: Mon, 8 Dec 2025 16:14:46 +0100
Subject: [PATCH] Add zfs-auto-snapshot.sh script

---
 README.md            |  1 +
 zfs-auto-snapshot.sh | 29 +++++++++++++++++++++++++++++
 2 files changed, 30 insertions(+)
 create mode 100755 zfs-auto-snapshot.sh

diff --git a/README.md b/README.md
index 53ec007..710f3bc 100644
--- a/README.md
+++ b/README.md
@@ -6,3 +6,4 @@ Some helpful bash scripts for [incus](https://linuxcontainers.org/incus)
 - incus-backup: Backup instances FS and DBs to a remote location using rsync over ssh.
 - incus-copy: Run a differential copy of all running instances to a remote incus server.
 - incus-snapshot: Take a snapshot on all running instances.
+- zfs-auto-snapshot: Create and cleanup expired zfs snapshots.
diff --git a/zfs-auto-snapshot.sh b/zfs-auto-snapshot.sh
new file mode 100755
index 0000000..a63d2f9
--- /dev/null
+++ b/zfs-auto-snapshot.sh
@@ -0,0 +1,29 @@
+#!/bin/bash
+#
+# Create zfs snapshots for $DATASET
+# https://github.com/bahamas10/zfs-prune-snapshots
+#
+
+#set -x
+
+while getopts d:e: flag
+do
+    case "${flag}" in
+        d) DATASET=${OPTARG};;
+        e) EXPIRATION=${OPTARG};;
+    esac
+done
+
+DATE=$(date '+%Y-%m-%d %H:%M:%S')
+
+TS=$(date '+%s')
+ZFS=$(which zfs)
+CMD="$ZFS snapshot ${DATASET}@snap${TS}"
+echo "[${DATE}] $CMD"
+$CMD 2>&1 > /dev/null
+
+ZFS_PRUNE_SNAPSHOTS=$(which zfs-prune-snapshots)
+CMD="$ZFS_PRUNE_SNAPSHOTS -p 'snap' $EXPIRATION $DATASET"
+echo "[${DATE}] $CMD"
+$CMD 2>&1 > /dev/null
+