Migrate role from cron to systemd

Systemd gives us the ability to monitor backup job status using existing
monitoring solutions (node exporter) and allows us greater control over
the scheduling of the backup jobs.

This introduces a breaking change that requires users to manually remove
the old repositories from the clients and redeploying them with the
role. You will have to remove the Cron job that was created by the
Ansible script, everything else will be overwritten with a run from the
newer version.

- name: Remove backup cron jobs
  ansible.builtin.cron:
    name: BORG (Application level backups)
    state: absent
  become: true
- name: Remove env for backup cron job
  ansible.builtin.cron:
    name: BORG_PASSPHRASE
    env: true
    state: absent
  become: true

Performing manual migrations on the Borg server is not required.

We now additionally support multiple Borg repositories per client host
using the `borg_backup_argument` variable.

Signed-off-by: Colin Wilk <colin.wilk@tum.de>

3 files changed, 11 insertions, 4 deletions

diff --git a/molecule/default/Dockerfile.j2 b/molecule/default/Dockerfile.j2
index 091ef00..cc459e3 100644
--- a/molecule/default/Dockerfile.j2
+++ b/molecule/default/Dockerfile.j2
@@ -6,10 +6,11 @@ RUN apt-get update \
        sudo wget \
        python3-pip python3-dev python3-setuptools python3-wheel python3-apt \
        sed ssh openssh-server \
+       systemd systemd-sysv dbus dbus-user-session \
     && rm -rf /var/lib/apt/lists/* \
     && rm -Rf /usr/share/doc && rm -Rf /usr/share/man \
     && apt-get clean
 
 RUN mkdir /run/sshd
 
-ENTRYPOINT ["bash", "-c", "/usr/sbin/sshd && sleep infinity"]
+ENTRYPOINT ["/sbin/init"]
diff --git a/molecule/default/converge.yml b/molecule/default/converge.yml
index 17b5f0e..7212eb2 100644
--- a/molecule/default/converge.yml
+++ b/molecule/default/converge.yml
@@ -9,6 +9,13 @@
     - name: Set borg server openssh key variable
       become: true
       block:
+        - name: Start ssh
+          ansible.builtin.systemd:
+            name: sshd
+            state: started
+          become: true
+          delegate_to: '{{ borg_server_host }}'
+
         - name: Fetch ssh_key
           ansible.builtin.command: >
             ssh-keyscan -t rsa
@@ -35,9 +42,6 @@
       - /opt
       - /var
       - /reee reeee
-    borg_cron_time:
-      minute: '*'
-      hour: '*'
 
   roles:
     - role: kliwniloc.borgbackup
diff --git a/molecule/default/molecule.yml b/molecule/default/molecule.yml
index 3c0dfef..fc7a266 100644
--- a/molecule/default/molecule.yml
+++ b/molecule/default/molecule.yml
@@ -13,6 +13,7 @@ platforms:
     image: ${MOLECULE_DISTRO_CLIENT:-debian:10}
     dockerfile: Dockerfile.j2
     pre_build_image: false
+    privileged: true
     docker_networks:
       - name: molecule-container-net
         driver_options:
@@ -25,6 +26,7 @@ platforms:
     image: ${MOLECULE_DISTRO_SERVER:-debian:10}
     dockerfile: Dockerfile.j2
     pre_build_image: false
+    privileged: true
     networks:
       - name: molecule-container-net