install hostsctl from aur

Prior to running this, existing users should put any custom host
definitions into /etc/hostsctl.d/10-hosts. This is due to a significant
refactor of hostsctl that was made after it was originally added to
spark. If you had not previously installed hostsctl, this is not
necessary.

    # mkdir /etc/hostsctl.d
    # echo "127.0.0.1" > /etc/hostsctl.d/10-hosts

The old script should also be deleted.

    # rm /usr/local/bin/hostsctl

roles/hostsctl/tasks/main.yml

@@ -1,12 +1,11 @@
 ---
-- name: Install hostsctl script
-  copy: src=hostsctl/hostsctl.sh dest=/usr/local/bin/hostsctl mode=0755
+- name: Install hostsctl
+  aur: name=hostsctl-git user={{ user.name }}
+  tags:
+    - aur
 
-- name: Set hostsctl URL
-  lineinfile: dest=/usr/local/bin/hostsctl
-              regexp=^URL
-              state=present
-              line='URL="{{ hostsctl.url }}"'
+- name: Push hostsctl config
+  template: src=hostsctl.conf.j2 dest=/etc/hostsctl.conf
 
 - name: Update hostsctl
   command: hostsctl update

roles/hostsctl/templates/hostsctl.conf.j2

@@ -0,0 +1,2 @@
+# {{ ansible_managed }}
+remote_hosts="{{ hostsctl.url }}"