From 64c6c0fee72110f2c6c701b03ce27dbe11ab5e64 Mon Sep 17 00:00:00 2001
From: Bertrand Benjamin <benjamin.bertrand@opytex.org>
Date: Mon, 5 Aug 2019 21:36:31 +0200
Subject: [PATCH] Feat: Create new task for automatic backup on dd

---
 files/dd_borg/40-backup.rules           |  3 +
 files/dd_borg/automatic-backup.service  |  4 +
 files/dd_borg/run.sh                    | 99 +++++++++++++++++++++++++
 tasks/dd_backup.yml                     | 41 ++++++++++
 4 files changed, 147 insertions(+)
 create mode 100644 files/dd_borg/40-backup.rules
 create mode 100644 files/dd_borg/automatic-backup.service 
 create mode 100644 files/dd_borg/run.sh
 create mode 100644 tasks/dd_backup.yml

diff --git a/files/dd_borg/40-backup.rules b/files/dd_borg/40-backup.rules
new file mode 100644
index 0000000..b172ac4
--- /dev/null
+++ b/files/dd_borg/40-backup.rules
@@ -0,0 +1,3 @@
+ACTION=="add", SUBSYSTEM=="bdi", DEVPATH=="/devices/virtual/bdi/*",
+TAG+="systemd", ENV{SYSTEMD_WANTS}="automatic-backup.service"
+
diff --git a/files/dd_borg/automatic-backup.service  b/files/dd_borg/automatic-backup.service 
new file mode 100644
index 0000000..c0209d2
--- /dev/null
+++ b/files/dd_borg/automatic-backup.service 	
@@ -0,0 +1,4 @@
+[Service]
+Type=oneshot
+ExecStart=/etc/backups/run.sh
+
diff --git a/files/dd_borg/run.sh b/files/dd_borg/run.sh
new file mode 100644
index 0000000..106d487
--- /dev/null
+++ b/files/dd_borg/run.sh
@@ -0,0 +1,99 @@
+#!/bin/bash -ue
+
+# The udev rule is not terribly accurate and may trigger our service before
+# the kernel has finished probing partitions. Sleep for a bit to ensure
+# the kernel is done.
+#
+# This can be avoided by using a more precise udev rule, e.g. matching
+# a specific hardware path and partition.
+sleep 5
+
+#
+# Script configuration
+#
+
+# The backup partition is mounted there
+MOUNTPOINT=/mnt/backup
+
+# This is the location of the Borg repository
+TARGET=$MOUNTPOINT/Combava
+
+# Archive name schema
+DATE=$(date --iso-8601)-$(hostname)
+
+# This is the file that will later contain UUIDs of registered backup drives
+DISKS=/etc/backups/backup.disks
+
+# Find whether the connected block device is a backup drive
+for uuid in $(lsblk --noheadings --list --output uuid)
+do
+    if grep --quiet --fixed-strings $uuid $DISKS; then
+        break
+    fi
+    uuid=
+done
+
+if [ ! $uuid ]; then
+    echo "No backup disk found, exiting"
+    exit 0
+fi
+
+echo "Disk $uuid is a backup disk"
+partition_path=/dev/disk/by-uuid/$uuid
+# Mount file system if not already done. This assumes that if something is already
+# mounted at $MOUNTPOINT, it is the backup drive. It won't find the drive if
+# it was mounted somewhere else.
+(mount | grep $MOUNTPOINT) || mount $partition_path $MOUNTPOINT
+drive=$(lsblk --inverse --noheadings --list --paths --output name $partition_path | head --lines 1)
+echo "Drive path: $drive"
+
+#
+# Create backups
+#
+
+# Options for borg create
+BORG_OPTS="--stats --one-file-system --compression lz4 --checkpoint-interval 86400"
+
+# Set BORG_PASSPHRASE or BORG_PASSCOMMAND somewhere around here, using export,
+# if encryption is used.
+
+# No one can answer if Borg asks these questions, it is better to just fail quickly
+# instead of hanging.
+export BORG_RELOCATED_REPO_ACCESS_IS_OK=no
+export BORG_UNKNOWN_UNENCRYPTED_REPO_ACCESS_IS_OK=no
+
+# Log Borg version
+borg --version
+
+echo "Starting backup for $DATE"
+
+# This is just an example, change it however you see fit
+borg create $BORG_OPTS \
+    --exclude /media/documents/games/ \
+    --exclude /media/documents/musique/ \
+    --exclude /media/documents/photos/ \
+    $TARGET::$DATE-$$-documents \
+    /media/documents/
+
+# /home is often a separate partition / file system.
+# Even if it isn't (add --exclude /home above), it probably makes sense
+# to have /home in a separate archive.
+borg create $BORG_OPTS \
+    --exclude 'sh:/home/*/.cache' \
+    $TARGET::$DATE-$$-home \
+    /home/
+
+echo "Completed backup for $DATE"
+
+# Just to be completely paranoid
+sync
+
+if [ -f /etc/backups/autoeject ]; then
+    umount $MOUNTPOINT
+    hdparm -Y $drive
+fi
+
+if [ -f /etc/backups/backup-suspend ]; then
+    systemctl suspend
+fi
+
diff --git a/tasks/dd_backup.yml b/tasks/dd_backup.yml
new file mode 100644
index 0000000..c206cc9
--- /dev/null
+++ b/tasks/dd_backup.yml
@@ -0,0 +1,41 @@
+---
+- name: Install autofs
+  pacman:
+    name: borg
+    state: present
+
+- name: copy udev rule in /etc/backups
+  copy:
+    src: files/dd_borg/40-backup.rules
+    dest: /etc/backups/40-backup.rules
+    backup: yes
+
+- name: Link it to /etc/udev
+  file:
+    src: /etc/backups/40-backup.rules
+    dest: /etc/udev/rules.d/40-backup.rules
+    state: link
+
+- name: copy service in /etc/backups
+  copy:
+    src: files/dd_borg/automatic-backup.service
+    dest: /etc/backups/automatic-backup.service
+    backup: yes
+
+- name: Link it to /etc/udev
+  file:
+    src: /etc/backups/automatic-backup.service
+    dest: /etc/udev/rules.d/automatic-backup.service
+    state: link
+
+- name: copy run scritp
+  template:
+    src: files/dd_borg/run.sh
+    dest: /etc/backups/run.sh
+
+- name: Reload systemctl
+  systemd:
+    daemon_reload: yes
+
+- name: Reload udev
+  shell: udevadm control --reload