added possibility to install certbot from package management

- introduces a variable certbot_from_git
- adds install from package tasks
- makes a variable called certbot_script available (to handle certbot vs certbot-auto naming)
- fixes geerlingguy#18

defaults/main.yml

@@ -1,10 +1,11 @@
 ---
 # Where to get Certbot.
+certbot_from_git: no
 certbot_repo: https://github.com/certbot/certbot.git
 certbot_version: master
 certbot_keep_updated: yes
 
-# Where to put Certbot.
+# Where to put Certbot when cloning from Git.
 certbot_dir: /opt/certbot
 
 # How to keep Certbot certs up to date.

tasks/install-from-git.yml

@@ -7,7 +7,11 @@
     update: "{{ certbot_keep_updated }}"
     force: yes
 
+- name: Set Certbot script variable
+  set_fact:
+    certbot_script: "{{ certbot_dir }}/certbot-auto"
+
 - name: Ensure certbot-auto is executable.
   file:
-    path: "{{ certbot_dir }}/certbot-auto"
+    path: "{{ certbot_script }}"
     mode: 0755

tasks/install-from-package.yml

@@ -0,0 +1,7 @@
+---
+- name: Install Certbot
+  package: name=certbot state=present
+
+- name: Set Certbot script variable
+  set_fact:
+    certbot_script: certbot

tasks/main.yml

@@ -1,5 +1,9 @@
 ---
+- include: install-from-package.yml
+  when: not certbot_from_git
+
 - include: install-from-git.yml
+  when: certbot_from_git
 
 - include: renew-cron.yml
   when: certbot_auto_renew

tasks/renew-cron.yml

@@ -1,8 +1,8 @@
 ---
-- name: Add cron job for 'certbot-auto renew' (if configured).
+- name: Add cron job for certbot renewal (if configured).
   cron:
     name: Certbot automatic renewal.
-    job: "{{ certbot_dir }}/certbot-auto renew --quiet --no-self-upgrade"
+    job: "{{ certbot_script }} renew --quiet --no-self-upgrade"
     minute: "{{ certbot_auto_renew_minute }}"
     hour: "{{ certbot_auto_renew_hour }}"
     user: "{{ certbot_auto_renew_user }}"