[borgbackup_client] Add initial role defintion

roles/borgbackup_client/defaults/main.yml

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+---
+borg_keep_daily: 7
+borg_keep_weekly: 4
+borg_keep_monthly: 12
+...

roles/borgbackup_client/handlers/main.yml

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+---
+- name: Run systemd daemon-reload
+  systemd:
+    daemon_reload: true
+
+- name: Start and enable borgmatic timer
+  systemd:
+    name: borgmatic.timer
+    state: started
+    enabled: true
+
+- name: Start and enable borgmatic service
+  systemd:
+    name: borgmatic.service
+    state: started
+    enabled: true
+...

roles/borgbackup_client/tasks/main.yml

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+---
+- name: Pin borgmatic
+  template:
+    src: "apt/{{ item }}.j2"
+    dest: "/etc/apt/{{ item }}"
+  loop:
+    - sources.list.d/bullseye.list
+    - preferences.d/borgmatic-bullseye
+  when:
+    - ansible_distribution == "Debian"
+    - ansible_distribution_major_version | int <= 10
+    - ansible_distribution_release != "bullseye"
+
+- name: Don't pin borgmatic if we are on bullseye
+  file:
+    path: "/etc/apt/{{ item }}"
+    state: absent
+  loop:
+    - sources.list.d/bullseye.list
+    - preferences.d/borgmatic-bullseye
+  when:
+    - ansible_distribution == "Debian"
+    - ansible_distribution_release == "bullseye"
+
+- name: Install borgmatic
+  apt:
+    name: borgmatic
+  register: apt_result
+  retries: 3
+  until: apt_result is succeeded
+
+- name: Create SSH key
+  openssh_keypair:
+    path: /etc/borgbackup/id_remote
+    type: ed25519
+    owner: root
+    group: root
+    mode: u=r,g=r,o=
+  register: ssh_key
+
+- name: Add public key to remote
+  delegate_to: "{{ borg_server_host }}"
+  become: "{{ borg_server_user }}"
+  authorized_key:
+    exclusive: false
+    key: "{{ ssh_key.public_key }}"
+    key_options: >-
+      command="borg serve --restrict-to-path {{ borg_host_dir }},
+      no-agent-forwarding,
+      no-port-forwarding,
+      no-pty,
+      no-user-rc,
+      no-X11-forwarding
+  vars:
+     borg_host_dir: "{{ borg_server_base_dir }}/{{ ansible_fqdn }}"
+
+- name: Add borgmatic configuration file
+  become: true
+  template:
+    src: borgmatic.conf.j2
+    dest: /etc/borgmatic/config.yaml
+    owner: root
+    group: root
+    mode: u=rw,g=r,o=
+
+- name: Install timer and service for borgmatic
+  template:
+    src: "{{ item }}.j2"
+    dest: "/etc/systemd/system/{{ item }}"
+    owner: root
+    group: root
+    mode: u=rw,g=r,o=
+  loop:
+    - borgmatic.timer
+    - borgmatic.service
+  notify:
+    - Run systemd daemon-reload
+    - Start and enable borgmatic timer
+    - Start and enable borgmatic service
+
+- include_role: update_motd
+  vars:
+    key: 10-borgmatic
+    message: Borgmatic (client) est installé dans /etc/borgmatic/config.yaml.
+...

roles/borgbackup_client/templates/borgmatic.service.j2

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+{{ ansible_managed | comment }}
+
+[Unit]
+Description=Service for borgmatic backup
+Wants=network-online.target
+After=network-online.target
+ConditionACPower=true
+
+[Service]
+Type=oneshot
+ProtectSystem=full
+CapabilityBoundingSet=CAP_DAC_READ_SEARCH CAP_NET_RAW
+
+# Lower CPU and I/O priority.
+Nice=19
+CPUSchedulingPolicy=batch
+IOSchedulingClass=best-effort
+IOSchedulingPriority=7
+IOWeight=100
+
+Restart=no
+# Prevent rate limiting of borgmatic log events. If you are using an older version of systemd that
+# doesn't support this (pre-240 or so), you may have to remove this option.
+LogRateLimitIntervalSec=0
+
+# Delay start to prevent backups running during boot. Note that systemd-inhibit requires dbus and
+# dbus-user-session to be installed.
+ExecStartPre=sleep 1m
+ExecStart=systemd-inhibit --who="borgmatic" --why="Prevent interrupting scheduled backup" /usr/bin/borgmatic --syslog-verbosity 1

roles/borgbackup_client/templates/borgmatic.timer.j2

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+{{ ansible_managed | comment }}
+
+[Unit]
+Description=Timer for borgmatic backup
+
+[Timer]
+OnCalendar=daily
+
+[Install]
+WantedBy=timers.target

roles/borgbackup_client/templates/config.yaml.j2

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+---
+{{ ansible_managed | comment }}
+
+location:
+  source_directories: {{ borg_backup_directories | to_nice_yaml }}
+  repositories:
+   - {{ borg_server_user }}@{{ borg_server_host }}:{{ borg_host_dir }}
+
+retention:
+  keep_daily: "{{ borg_keep_daily }}"
+  keep_weekly: "{{ borg_keep_weekly }}"
+  keep_monthly: "{{ borg_keep_yearly }}"
+
+consistency:
+  checks:
+    - repository
+    - archives
+
+{% if postgresql_databases is defined %}
+hooks:
+  postgresql_databases:
+    - name: all
+{% endif %}
+...
+