roles/common: Add tasks to install tarsnap

Now that Tarsnap has official packages this is one less thing that
needs to be manually installed from source after bringing a machine
up.

See: http://mail.tarsnap.com/tarsnap-announce/msg00037.html

roles/common/tasks/packages_Debian.yml

@@ -23,4 +23,6 @@
 - include: cron-apt.yml
   tags: cron-apt
 
+- include: tarsnap.yml
+
 # vim: set sw=2 ts=2:

roles/common/tasks/packages_Ubuntu.yml

@@ -46,4 +46,6 @@
 - include: cron-apt.yml
   tags: cron-apt
 
+- include: tarsnap.yml
+
 # vim: set sw=2 ts=2:

roles/common/tasks/tarsnap.yml

@@ -0,0 +1,12 @@
+---
+- name: Add Tarsnap apt mirror
+  template: src=tarsnap_sources.list.j2 dest=/etc/apt/sources.list.d/tarsnap.list owner=root group=root mode=0644
+  when: ansible_architecture != 'armv7l'
+
+- name: Add GPG key for Tarsnap
+  apt_key: id=0x40B98B68F04DE775 url=https://pkg.tarsnap.com/tarsnap-deb-packaging-key.asc state=present
+
+- name: Install tarsnap
+  apt: pkg=tarsnap
+
+# vim: set sw=2 ts=2:

roles/common/templates/tarsnap_sources.list.j2

@@ -0,0 +1 @@
+deb http://pkg.tarsnap.com/deb/{{ ansible_distribution_release }} ./