Add repos validations role.

This patch migrates the former validations/repos.yaml validation into
a role.

Change-Id: I10fbabf135908845d78eec64f780db04dffb42d1
Implements: blueprint validation-framework

playbooks/repos.yaml

@@ -0,0 +1,15 @@
+---
+- hosts: undercloud, overcloud
+  vars:
+    metadata:
+      name: Check correctness of current repositories
+      description: >
+        Detect whether the repositories listed in `yum repolist`
+        can be connected to and that there is at least one repo
+        configured.
+
+        Detect if there are any unwanted repositories (such as EPEL) enabled.
+      groups:
+        - pre-upgrade
+  roles:
+    - repos

roles/repos/README.md

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+Repos
+==============
+
+An Ansible role to check the correctness of current repositories.
+
+Requirements
+------------
+
+This role could be used before/after an Undercloud or an Overcloud has been
+deployed.
+
+Role Variables
+--------------
+
+- None
+
+Dependencies
+------------
+
+No dependencies.
+
+Example Playbook
+----------------
+
+    - hosts: undercloud
+      roles:
+         - role: repos
+
+    - hosts: overcloud
+      roles:
+         - role: repos
+
+License
+-------
+
+Apache
+
+Author Information
+------------------
+
+Red Hat TripleO Validations Team

roles/repos/meta/main.yml

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+galaxy_info:
+  author: TripleO Validations Team
+  company: Red Hat
+  license: Apache
+  min_ansible_version: 2.4
+
+  platforms:
+  - name: CentOS
+    versions:
+    - 7
+  - name: RHEL
+    versions:
+    - 7
+
+  categories:
+    - cloud
+    - baremetal
+    - system
+
+  galaxy_tags: []
+    # List tags for your role here, one per line. A tag is a keyword that describes
+    # and categorizes the role. Users find roles by searching for tags. Be sure to
+    # remove the '[]' above, if you add tags to this list.
+    #
+    # NOTE: A tag is limited to a single word comprised of alphanumeric characters.
+    #       Maximum 20 tags per role.
+

roles/repos/tasks/main.yml

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+---
+- name: List repositories
+  command: 'yum repolist -v'
+  args:
+    warn: no
+  changed_when: False
+  register: repositories
+
+- name: Find repository URLs
+  shell: 'echo "{{ repositories.stdout }}" | grep Repo-baseurl | sed  "s/Repo-baseurl.*\(http[^ ]*\).*/\1/g"'
+  register: repository_urls
+  changed_when: False
+
+- name: Check if there is at least one repository baseurl
+  fail:
+    msg: No repository found in yum repolist
+  when: repository_urls.stdout_lines|length < 1
+
+- name: Call repository URLs
+  uri:
+    url: "{{ item }}"
+  with_items: "{{ repository_urls.stdout_lines }}"
+
+- name: Find repository IDs
+  changed_when: False
+  shell: 'echo "{{ repositories.stdout }}" | grep Repo-id | sed "s/Repo-id.*://" | tr -d " "'
+  register: repository_ids
+
+- name: Check if there are any unwanted repositories enabled
+  fail:
+    msg: Found unwanted repository {{ item.0 }} enabled
+  when: item.0 == item.1
+  with_nested:
+    - [ 'epel/x86_64' ]
+    - "{{ repository_ids.stdout_lines }}"

roles/repos/vars/main.yml

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+---
+metadata:
+  name: Check correctness of current repositories
+  description: >
+    Detect whether the repositories listed in `yum repolist`
+    can be connected to and that there is at least one repo
+    configured.
+
+    Detect if there are any unwanted repositories (such as EPEL) enabled.
+  groups:
+    - pre-upgrade