From 893a49a3f3de1d0ef316bf77c0cc1bf9b7bf5ee3 Mon Sep 17 00:00:00 2001
From: Stefan Agner <stefan@agner.ch>
Date: Mon, 2 Oct 2023 08:30:20 +0200
Subject: [PATCH] Add fsfreeze support for QEMU/KVM/Proxmox installations
 (#2781)

* Add fsfreeze support for QEMU/KVM/Proxmox installations

Add fsfreeze scripts which calls the new Supervisor API to freeze Home
Assistant Core and add-ons which support the backup freeze scripts
(`backup_pre` and `backup_post`).

This allows to create safe snapshots with databases running.

* Fix lint issues
---
 .../systemd/system/qemu-guest.service.d/haos.conf |  3 +++
 .../rootfs-overlay/usr/libexec/haos-freeze-hook   | 15 +++++++++++++++
 2 files changed, 18 insertions(+)
 create mode 100644 buildroot-external/rootfs-overlay/usr/lib/systemd/system/qemu-guest.service.d/haos.conf
 create mode 100755 buildroot-external/rootfs-overlay/usr/libexec/haos-freeze-hook

diff --git a/buildroot-external/rootfs-overlay/usr/lib/systemd/system/qemu-guest.service.d/haos.conf b/buildroot-external/rootfs-overlay/usr/lib/systemd/system/qemu-guest.service.d/haos.conf
new file mode 100644
index 000000000..7d92caf11
--- /dev/null
+++ b/buildroot-external/rootfs-overlay/usr/lib/systemd/system/qemu-guest.service.d/haos.conf
@@ -0,0 +1,3 @@
+[Service]
+ExecStart=
+ExecStart=/usr/libexec/qemu-ga -m virtio-serial -p /dev/virtio-ports/org.qemu.guest_agent.0 --fsfreeze-hook /usr/libexec/haos-freeze-hook
diff --git a/buildroot-external/rootfs-overlay/usr/libexec/haos-freeze-hook b/buildroot-external/rootfs-overlay/usr/libexec/haos-freeze-hook
new file mode 100755
index 000000000..f15d058fd
--- /dev/null
+++ b/buildroot-external/rootfs-overlay/usr/libexec/haos-freeze-hook
@@ -0,0 +1,15 @@
+#!/bin/sh
+set -e
+
+action="$1"
+
+if [ "${action}" = "freeze" ]; then
+	echo "File system freeze requested, freezing Home Assistant"
+	ha backups freeze
+elif [ "${action}" = "thaw" ]; then
+	echo "File system thaw requested, thawing Home Assistant"
+	ha backups thaw
+else
+	echo "Unknown action ${action}"
+fi
+