aria2: Deploy aria2 download manager

The *aria2* role installs the *aria2* download manager and sets it up to
run as a system service with RPC enabled. It also sets up the web UI,
though that must be installed manually from an archive, for now.

roles/aria2/tasks/main.yml

@@ -0,0 +1,88 @@
+- name: ensure aria2 is installed
+  package:
+    name=aria2
+    state=present
+  tags:
+  - install
+
+- name: ensure aria2 group exists
+  group:
+    name=aria2
+    system=yes
+    state=present
+  tags:
+  - group
+  - user
+- name: ensure aria2 user exists
+  user:
+    name: aria2
+    group: aria2
+    comment: aria2 Download Manager
+    home: /var/lib/aria2
+    createhome: true
+    shell: /sbin/nologin
+    system: true
+    state: present
+
+- name: ensure aria2 is configured
+  template:
+    src=aria2.conf.j2
+    dest=/etc/aria2.conf
+    mode=0644
+  notify: restart aria2
+
+- name: ensure aria2 download directory exists
+  file:
+    path={{ aria2_download_dir }}
+    owner=aria2
+    group=aria2
+    mode=755
+    state=directory
+
+- name: ensure aria2 state file exists
+  copy:
+    dest=/var/lib/aria2/aria2.state
+    content=
+    force=no
+
+- name: ensure aria2 systemd unit exists
+  copy:
+    src=aria2.service
+    dest=/etc/systemd/system/aria2.service
+    mode=0644
+  notify: reload systemd
+
+- name: ensure firewall is configured for aria2
+  firewalld:
+    port: '{{ item }}'
+    permanent: false
+    immediate: true
+    state: enabled
+  with_items:
+  - 6800/tcp
+  - '{{ aria2_listen_ports }}/tcp'
+  - '{{ aria2_dht_listen_ports }}/tcp'
+  notify: save firewalld configuration
+
+- name: ensure aria2 service starts at boot
+  service:
+    name=aria2
+    enabled=yes
+- meta: flush_handlers
+- name: ensure aria2 service is running
+  service:
+    name=aria2
+    state=started
+
+- name: ensure aria2 web ui is configured
+  template: 
+    src=configuration.js.j2
+    dest=/var/lib/aria2/webui/configuration.js
+    mode=0644
+
+- name: ensure apache is configured to serve aria2 web ui
+  copy:
+    src=aria2.httpd.conf
+    dest=/etc/httpd/conf.d/aria2.conf
+    mode=0644
+  notify: reload httpd