From 5caeb99c1d75acabe423a96d2e1660366ddaea5d Mon Sep 17 00:00:00 2001
From: "Kevin Veen-Birkenbach [aka. Frantz]" <kevin@veen.world>
Date: Sun, 30 Jan 2022 13:22:47 +0100
Subject: [PATCH] created health check for btrfs

---
 playbook.yml                                  |  5 +++++
 roles/native-btrfs-health-check/README.md     |  8 +++++++
 .../files/btrfs-health-check.service          |  8 +++++++
 .../files/btrfs-health-check.sh               |  6 +++++
 .../files/btrfs-health-check.timer            |  8 +++++++
 .../handlers/main.yml                         | 12 ++++++++++
 roles/native-btrfs-health-check/meta/main.yml |  2 ++
 .../native-btrfs-health-check/tasks/main.yml  | 22 +++++++++++++++++++
 8 files changed, 71 insertions(+)
 create mode 100644 roles/native-btrfs-health-check/README.md
 create mode 100644 roles/native-btrfs-health-check/files/btrfs-health-check.service
 create mode 100644 roles/native-btrfs-health-check/files/btrfs-health-check.sh
 create mode 100644 roles/native-btrfs-health-check/files/btrfs-health-check.timer
 create mode 100644 roles/native-btrfs-health-check/handlers/main.yml
 create mode 100644 roles/native-btrfs-health-check/meta/main.yml
 create mode 100644 roles/native-btrfs-health-check/tasks/main.yml

diff --git a/playbook.yml b/playbook.yml
index 42b4356b..90f0e378 100644
--- a/playbook.yml
+++ b/playbook.yml
@@ -7,6 +7,11 @@
     - system-update
     - native-journalctl
     #- native-hostname
+- name: setup btrfs health check
+  hosts: btrfs_health_check_hosts
+  become: true
+  roles:
+    - native-btrfs-health-check
 - name: setup standard wireguard hosts
   hosts: wireguard_hosts
   become: true
diff --git a/roles/native-btrfs-health-check/README.md b/roles/native-btrfs-health-check/README.md
new file mode 100644
index 00000000..1f888ba0
--- /dev/null
+++ b/roles/native-btrfs-health-check/README.md
@@ -0,0 +1,8 @@
+# btrfs-health-check
+
+Sends a health report
+
+## see
+- https://superuser.com/questions/789303/how-to-monitor-btrfs-filesystem-raid-for-errors
+- https://unix.stackexchange.com/questions/193619/list-all-btrfs-filesystems-and-subvolumes-in-shell
+- https://www.freedesktop.org/software/systemd/man/systemd.unit.html
diff --git a/roles/native-btrfs-health-check/files/btrfs-health-check.service b/roles/native-btrfs-health-check/files/btrfs-health-check.service
new file mode 100644
index 00000000..23b65736
--- /dev/null
+++ b/roles/native-btrfs-health-check/files/btrfs-health-check.service
@@ -0,0 +1,8 @@
+[Unit]
+Description=Check btrfs status
+OnFailure=systemd-email@%n.service
+OnSuccess=systemd-email@%n.service
+
+[Service]
+Type=oneshot
+ExecStart=/bin/bash /home/administrator/scripts/btrfs-health-check/btrfs-health-check.sh
diff --git a/roles/native-btrfs-health-check/files/btrfs-health-check.sh b/roles/native-btrfs-health-check/files/btrfs-health-check.sh
new file mode 100644
index 00000000..5a8b7a00
--- /dev/null
+++ b/roles/native-btrfs-health-check/files/btrfs-health-check.sh
@@ -0,0 +1,6 @@
+#!/bin/bash
+# Checks the healt of all btrfs volumes
+for path in $(btrfs filesystem show | awk '/ path /{print $NF}')
+do
+  btrfs device stats $path
+done
diff --git a/roles/native-btrfs-health-check/files/btrfs-health-check.timer b/roles/native-btrfs-health-check/files/btrfs-health-check.timer
new file mode 100644
index 00000000..9f116f74
--- /dev/null
+++ b/roles/native-btrfs-health-check/files/btrfs-health-check.timer
@@ -0,0 +1,8 @@
+[Unit]
+Description=starts btrfs-health-check.service
+
+[Timer]
+OnCalendar=12:00
+
+[Install]
+WantedBy=timers.target
diff --git a/roles/native-btrfs-health-check/handlers/main.yml b/roles/native-btrfs-health-check/handlers/main.yml
new file mode 100644
index 00000000..a6104905
--- /dev/null
+++ b/roles/native-btrfs-health-check/handlers/main.yml
@@ -0,0 +1,12 @@
+- name: "restart btrfs-health-check.service"
+  systemd:
+    name: btrfs-health-check.service
+    state: restarted
+    enabled: yes
+    daemon_reload: yes
+- name: "restart btrfs-health-check.timer"
+  systemd:
+    name: btrfs-health-check.timer
+    state: restarted
+    enabled: yes
+    daemon_reload: yes
diff --git a/roles/native-btrfs-health-check/meta/main.yml b/roles/native-btrfs-health-check/meta/main.yml
new file mode 100644
index 00000000..9d9d34e2
--- /dev/null
+++ b/roles/native-btrfs-health-check/meta/main.yml
@@ -0,0 +1,2 @@
+dependencies:
+  - native-systemd-email
diff --git a/roles/native-btrfs-health-check/tasks/main.yml b/roles/native-btrfs-health-check/tasks/main.yml
new file mode 100644
index 00000000..0e88f5ad
--- /dev/null
+++ b/roles/native-btrfs-health-check/tasks/main.yml
@@ -0,0 +1,22 @@
+- name: "create /home/administrator/scripts/btrfs-health-check/"
+  file:
+    path: "/home/administrator/scripts/btrfs-health-check"
+    state: directory
+    mode: 0755
+
+- name: create btrfs-health-check.sh
+  copy:
+    src: btrfs-health-check.sh
+    dest: "/home/administrator/scripts/btrfs-health-check/btrfs-health-check.sh"
+
+- name: create btrfs-health-check.service
+  copy:
+    src: btrfs-health-check.service
+    dest: "/etc/systemd/system/btrfs-health-check.service"
+  notify: restart btrfs-health-check.service
+
+- name: create btrfs-health-check.timer
+  copy:
+    src: btrfs-health-check.timer
+    dest: "/etc/systemd/system/btrfs-health-check.timer"
+  notify: restart btrfs-health-check.timer