Added option installation URL variable to vars, where InfluxDB will be...

Added option installation URL variable to vars, where InfluxDB will be installed via URL instead of through the package repo.

tasks/install-debian.yml

+---
 - name: Install any necessary dependencies [Debian/Ubuntu]
   apt: 
     name: "{{ item }}" 
     state: present 
     update_cache: yes 
     cache_valid_time: 3600
-
   with_items:
     - python-httplib2
     - python-apt
@@ -14,14 +14,25 @@
   apt_key:
     url: https://repos.influxdata.com/influxdb.key
     state: present
+  when: influxdb_install_url is not defined or influxdb_install_url == None
 
 - name: Add InfluxDB repository [Debian/Ubuntu]
   apt_repository:
     repo: deb https://repos.influxdata.com/{{ ansible_distribution | lower }} {{ ansible_distribution_release }} {{ influxdb_install_version }}
     state: present
-    
+  when: influxdb_install_url is not defined or influxdb_install_url == None
 
 - name: Install InfluxDB packages [Debian/Ubuntu]
   apt: 
     name: influxdb
-    state: present
\ No newline at end of file
+    state: present
+  when: influxdb_install_url is not defined or influxdb_install_url == None
+
+- name: Debug
+  debug: var=influxdb_install_url
+  
+- name: Install InfluxDB from URL [Debian/Ubuntu]
+  apt: 
+    name: "{{ influxdb_install_url }}"
+    state: present
+  when: influxdb_install_url is defined and influxdb_install_url != None

tasks/install-redhat.yml

+---
 - name: Install any necessary dependencies [RedHat/CentOS]
   yum: 
     name: "{{ item }}" 
@@ -11,8 +12,17 @@
     dest: /etc/yum.repos.d/influxdb.repo
     force: yes
     backup: yes
+  when: influxdb_install_url is not defined or influxdb_install_url == None
 
 - name: Install InfluxDB packages [RHEL/CentOS]
   yum: 
     name: influxdb
     state: present
+  when: influxdb_install_url is not defined or influxdb_install_url == None
+
+- name: Install InfluxDB from URL [RHEL/CentOS]
+  yum: 
+    name: "{{ influxdb_install_url }}"
+    state: present
+  when: influxdb_install_url is defined and influxdb_install_url != None
+  
\ No newline at end of file

vars/main.yml

 ---
 
-# Whether or not the playbook is run locally (changes clustering logic slightly)
+# Whether or not the playbook is run locally (changes clustering and testing logic slightly)
+# This should only be set in the Vagrantfile and not modified elsewhere
 is_vagrant: no
 
-# Whether or not to purge peer data on each run (useful for cluster testing),
-# NOTE: This will cause data loss on an active cluster, so use caution
+# By default, the InfluxData package repository will be used for installation. Alternatively,
+# if you have a specific package/version you want to install from, you can specify a package
+# URL here. Note that this does not modify any other logic, so installing older versions may
+# lead to unexpected results. Use at your own risk.
+influxdb_install_url: 
+
+# Whether or not to purge peer data on each run (useful for cluster testing). NOTE: This will
+# cause data loss on an active cluster, so use caution
 influxdb_purge_peer_data: no
 
 # If yes, service will be started. Will not be started if set to no.