compatibility with borg 1.x can be used via matrix_backup_borg_remote_version variable

roles/custom/matrix-backup-borg/defaults/main.yml

@@ -20,6 +20,9 @@ matrix_backup_borg_docker_image_force_pull: "{{ matrix_backup_borg_docker_image.
 # A list of extra arguments to pass to the container
 matrix_backup_borg_container_extra_arguments: []
 
+
+matrix_backup_borg_remote_version: "2"
+
 # List of systemd services that matrix-backup-borg.service depends on
 matrix_backup_borg_systemd_required_services_list: ['docker.service']
 

roles/custom/matrix-backup-borg/tasks/setup_install.yml

@@ -95,7 +95,7 @@
 
 - name: Ensure matrix-backup-borg.service installed
   ansible.builtin.template:
-    src: "{{ role_path }}/templates/systemd/matrix-backup-borg.service.j2"
+    src: "{{ role_path }}/templates/systemd/matrix-backup-borg-{{ matrix_backup_borg_remote_version }}.service.j2"
     dest: "{{ devture_systemd_docker_base_systemd_path }}/matrix-backup-borg.service"
     mode: 0644
   register: matrix_backup_borg_systemd_service_result

roles/custom/matrix-backup-borg/templates/systemd/matrix-backup-borg-1.service.j2

@@ -0,0 +1,65 @@
+#jinja2: lstrip_blocks: "True"
+[Unit]
+Description=Matrix Borg Backup
+{% for service in matrix_backup_borg_systemd_required_services_list %}
+Requires={{ service }}
+After={{ service }}
+{% endfor %}
+{% for service in matrix_backup_borg_systemd_wanted_services_list %}
+Wants={{ service }}
+{% endfor %}
+DefaultDependencies=no
+
+[Service]
+Type=oneshot
+Environment="HOME={{ devture_systemd_docker_base_systemd_unit_home_path }}"
+ExecStartPre=-{{ devture_systemd_docker_base_host_command_sh }} -c '{{ devture_systemd_docker_base_host_command_docker }} kill matrix-backup-borg 2>/dev/null || true'
+ExecStartPre=-{{ devture_systemd_docker_base_host_command_sh }} -c '{{ devture_systemd_docker_base_host_command_docker }} rm matrix-backup-borg 2>/dev/null || true'
+ExecStartPre=-{{ devture_systemd_docker_base_host_command_docker }} run --rm --name matrix-backup-borg \
+			--log-driver=none \
+			--cap-drop=ALL \
+			--read-only \
+			--user={{ matrix_user_uid }}:{{ matrix_user_gid }} \
+			--network={{ matrix_docker_network }} \
+			--tmpfs=/tmp:rw,noexec,nosuid,size=100m \
+			--mount type=bind,src={{ matrix_backup_borg_config_path }}/passwd,dst=/etc/passwd,ro \
+			--mount type=bind,src={{ matrix_backup_borg_config_path }},dst=/etc/borgmatic.d,ro \
+			{% for source in matrix_backup_borg_location_source_directories %}
+			--mount type=bind,src={{ source }},dst={{ source }},ro \
+			{% endfor %}
+			{% for arg in matrix_backup_borg_container_extra_arguments %}
+			{{ arg }} \
+			{% endfor %}
+			{{ matrix_backup_borg_docker_image }} \
+			sh -c "borgmatic --init --encryption {{ matrix_backup_borg_encryption }}"
+
+# The `CAP_DAC_OVERRIDE` capability is required, so that `root` in the container
+# can read the `/etc/borgmatic.d/config.yaml` (`{{ matrix_backup_borg_config_path }}/config.yaml`) file,
+# owned by `matrix:matrix` on the filesystem.
+#
+# `/root` is mountes as temporary filesystem, because we're using `--read-only` and because
+# Borgmatic tries to write to at least a few paths under `/root` (`.config`, `.ssh`, `.borgmatic`).
+ExecStart={{ devture_systemd_docker_base_host_command_docker }} run --rm --name matrix-backup-borg \
+			--log-driver=none \
+			--cap-drop=ALL \
+			--cap-add=CAP_DAC_OVERRIDE \
+			--read-only \
+			--network={{ matrix_docker_network }} \
+			--tmpfs=/root:rw,noexec,nosuid,size=100m \
+			--tmpfs=/tmp:rw,noexec,nosuid,size=100m \
+			--mount type=bind,src={{ matrix_backup_borg_config_path }}/passwd,dst=/etc/passwd,ro \
+			--mount type=bind,src={{ matrix_backup_borg_config_path }},dst=/etc/borgmatic.d,ro \
+			{% for source in matrix_backup_borg_location_source_directories %}
+			--mount type=bind,src={{ source }},dst={{ source }},ro \
+			{% endfor %}
+			{% for arg in matrix_backup_borg_container_extra_arguments %}
+			{{ arg }} \
+			{% endfor %}
+			{{ matrix_backup_borg_docker_image }}
+
+ExecStop=-{{ devture_systemd_docker_base_host_command_sh }} -c '{{ devture_systemd_docker_base_host_command_docker }} kill matrix-backup-borg 2>/dev/null || true'
+ExecStop=-{{ devture_systemd_docker_base_host_command_sh }} -c '{{ devture_systemd_docker_base_host_command_docker }} rm matrix-backup-borg 2>/dev/null || true'
+SyslogIdentifier=matrix-backup-borg
+
+[Install]
+WantedBy=multi-user.target