Added borg backup role

defaults/main.yml

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+---
+borg_prune_arguments: '--keep-within 30d'
+...

files/borg.fact

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+#!/bin/sh
+
+echo '{'
+if [ -e '/root/.ssh/borg.pub' ]; then
+    pubkey=`cat /root/.ssh/borg.pub | tr -d "\n"`
+    echo -ne '  "pubkey": "'$pubkey'"'
+    pubkey_prefix=",\n"
+fi
+if [ -e '/srv/borg/repos/' ]; then
+    echo -ne "${pubkey_prefix:-}"'  "repos": {'"\n"
+    for repo in `ls /srv/borg/repos/`; do
+        id=`awk '/^id =/ {print $3}' /srv/borg/repos/${repo}/config`
+        echo -ne ${repo_prefix:-}'    "'$repo'": "'$id'"'
+        repo_prefix=",\n"
+    done
+    echo -ne "\n  }"
+fi
+echo -ne "\n}"

tasks/client.yml

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+---
+- name: generate borg ssh key on client
+  openssh_keypair:
+    owner: root
+    mode: 0400
+    path: /root/.ssh/borg
+    type: ed25519
+  register: borg_ssh_key
+
+- name: reload ansible_local
+  setup: filter=ansible_local
+  when: borg_ssh_key.changed
+
+- name: Enforce borg authorized key on server
+  authorized_key:
+    user: borg
+    key: "{{ ansible_local.borg.pubkey }}"
+    key_options: 'command="cd /srv/borg/repos/{{ ansible_hostname }}; borg serve --restrict-to-path /srv/borg/repos/{{ ansible_hostname }}",restrict'
+  delegate_to: "{{ borg_server }}"
+
+- name: create borg client repo directory on server
+  file:
+    path: "/srv/borg/repos/{{ ansible_hostname }}"
+    state: directory
+    owner: borg
+    mode: 0700
+  delegate_to: "{{ borg_server }}"
+
+- name: create borg client repo on server
+  command: "borg init --encryption=none /srv/borg/repos/{{ ansible_hostname }}"
+  become: yes
+  become_method: su
+  become_user: borg
+  delegate_to: "{{ borg_server }}"
+  args:
+    creates: "/srv/borg/repos/{{ ansible_hostname }}/config"
+
+- name: reload ansible_local
+  setup: filter=ansible_local
+  delegate_to: "{{ borg_server }}"
+  delegate_facts: True
+  when: hostvars[borg_server]['ansible_local']['borg']['repos'][ansible_hostname] is not defined
+
+- name: make the server known to the client
+  lineinfile:
+    line: "{{ borg_server }} ecdsa-sha2-nistp256 {{ hostvars[borg_server]['ansible_ssh_host_key_ecdsa_public'] }}"
+    path: /root/.ssh/known_hosts
+    create: yes
+
+- name: make the repo directory on the client
+  file:
+    state: directory
+    path: "/root/.config/borg/security/{{ hostvars[borg_server]['ansible_local']['borg']['repos'][ansible_hostname] }}"
+    owner: root
+    mode: 0700
+
+- name: make the repo known to the client
+  copy:
+    dest: "/root/.config/borg/security/{{ hostvars[borg_server]['ansible_local']['borg']['repos'][ansible_hostname] }}/key-type"
+    content: "2"
+    owner: root
+    mode: 0600
+
+- name: deploy borg backup script
+  template:
+    dest: /usr/local/bin/adyxax_backup.sh
+    src: backup.sh.j2
+    owner: root
+    mode: 0500
+
+- name: activate borg cron on alpine
+  lineinfile:
+    line: '0 23 * * * /usr/local/bin/adyxax_backup.sh'
+    path: /etc/crontabs/root
+  when: ansible_os_family == 'Alpine'
+
+- name: activate borg cron on gentoo or redhat
+  file:
+    state: link
+    src: /usr/local/bin/adyxax_backup.sh
+    dest: /etc/cron.daily/backup
+  when: ansible_os_family == 'Gentoo' or ansible_os_family == 'RedHat'
+
+- name: activate borg cron on openbsd
+  lineinfile:
+    line: '0 23 * * * /usr/local/bin/adyxax_backup.sh'
+    path: /var/cron/tabs/root
+  when: ansible_os_family == 'OpenBSD'
+...

tasks/common.yml

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+---
+- name: set distro-specific server variables
+  include_vars: '{{ ansible_os_family }}.yml'
+
+- name: Check if borg is supported on distro
+  fail:
+    msg: "borg tasks are not supported on this operating system yet."
+  when: borg_packages is not defined
+
+- name: Ensure borg is installed
+  package:
+    name: "{{ borg_packages }}"
+
+- name: Push borg gathering fact on client
+  copy:
+    src: borg.fact
+    dest: /etc/ansible/facts.d/
+    mode: 0500
+    owner: root
+  register: borg_gathering_fact
+
+- name: reload ansible_local
+  setup: filter=ansible_local
+  when: borg_gathering_fact.changed
+...

tasks/main.yml

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+---
+- import_tasks: common.yml
+  when: (is_borg_server|default(false)) or borg_server is defined
+
+- import_tasks: server.yml
+  when: (is_borg_server|default(false))
+
+- import_tasks: client.yml
+  when: borg_server is defined
+...

tasks/server.yml

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+---
+- name: Create borg group on server
+  group:
+    name: borg
+    system: yes
+
+- name: Create borg user on server
+  user:
+    name: borg
+    shell: /bin/sh
+    home: /srv/borg
+    createhome: yes
+    system: yes
+    password_lock: yes
+
+- name: Ensure borg directories exist on server
+  file:
+    state: directory
+    path: "{{ item }}"
+    owner: borg
+    mode: 0700
+  loop:
+    - /srv/borg
+    - /srv/borg/.ssh
+    - /srv/borg/repos
+...

templates/backup.sh.j2

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+#!/bin/sh
+
+{% for job in borg_jobs %}
+{% if job.command_to_pipe is defined %}
+{{ job.command_to_pipe }} | BORG_RSH="ssh -i /root/.ssh/borg" borg create borg@{{ borg_server }}:/srv/borg/repos/{{ ansible_hostname }}::{{ job.name }}-{now} {{ job.path | default('-') }}
+{% else %}
+BORG_RSH="ssh -i /root/.ssh/borg" borg create borg@{{ borg_server }}:/srv/borg/repos/{{ ansible_hostname }}::{{ job.name }}-{now} {{ job.path }}
+{% endif %}
+{% endfor %}
+
+BORG_RSH="ssh -i /root/.ssh/borg" borg prune borg@{{ borg_server }}:/srv/borg/repos/{{ ansible_hostname }} {{ borg_prune_arguments }}

vars/Alpine.yml

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+---
+borg_packages:
+  - 'borgbackup'
+...

vars/Gentoo.yml

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+---
+borg_packages:
+  - 'app-backup/borgbackup'
+...

vars/OpenBSD.yml

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+---
+borg_packages:
+  - 'borgbackup'
+...

vars/RedHat.yml

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+---
+borg_packages:
+  - borgbackup
+...