install epel repo via yum install epel-release as in the example

bennojoy/nginx#15

Author: enginyoyen

tasks/nginx_redhat.yml

@@ -1,20 +1,28 @@
 ---
 
-- name: nginx_redhat |Install the selinux python module
+- name: nginx_redhat | Install the selinux python module
   yum: 
       name=libselinux-python 
       state=present
-  when: ansible_os_family == "RedHat"
 
-- name: nginx_redhat| Copy the epel packages 
+- name: nginx_redhat | Check if epel-release exists in yum
+  command: yum info epel-release
+  register: epel_release_existed
+
+- name: nginx_redhat | Copy the epel packages
   copy: 
        src=epel.repo 
        dest=/etc/yum.repos.d/epel_ansible.repo
-  when: ansible_os_family == "RedHat"
+  when: epel_release_existed.rc != 0
+
+- name: nginx_redhat | Install the epel-release repo
+  yum: 
+      name=epel-release
+      state=present
+  when: epel_release_existed.rc == 0
 
 - name: nginx_redhat | Install the nginx packages 
   yum: 
-      name={{ item }} 
+      name={{ item }}
       state=present
   with_items: redhat_pkg
-  when: ansible_os_family == "RedHat"