create content_view_rollback role

roles/content_view_rollback/README.md

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+theforeman.foreman.content_view_rollback
+=========
+
+A role for automating the rollback of Content-Views.
+
+Requirements
+------------
+
+This role requires the theforeman.foreman module collection.
+
+Role Variables
+--------------
+
+This role requires most of the common foreman variable more noteably:
+
+`foreman_organization`: The Organization that the Content-View belongs to.
+
+`foreman_username`: A foreman user that has access rights to publish new Content-View versions in the aforementioned Organization. 
+
+`foreman_password`: The password for the user. foreman_server_url: The URL used to access foreman.
+
+
+As well as two additional variables:
+
+`foreman_content_view`: The name of the Content-View which should have Lifecycle Environments promoted.
+
+`foreman_lifecycle_environments`: A list of Lifecycle Environments that should be promtoed.
+
+
+
+Dependencies
+------------
+
+You need a Foreman user with admin access to the Organization, Lifecycle_Environment, and Content_View you wish to interact with.
+
+By default, the role will require a valid SSL certificate installed on your Foreman server that the ansible client can trace trust to.  To disable that update the 'FOREMAN_VALIDATE_CERTS' variable in defaults/main.yml.
+
+For example, to disable certificate checking you would update the variable as such:
+```
+FOREMAN_VALIDATE_CERTS: false
+```
+
+Example Playbook
+----------------
+
+The role can be instantiated quite simply, all of the decision making is handled by the variables previously set:
+
+```
+---
+- name: "Run the content_view_rollback Role"
+  hosts: all
+  tasks:
+  - name: "Run the content_view_rollback Role"
+    include_role: 
+      name: theforeman.foreman.content_view_rollback
+```
+For example:
+
+Rolling back Lifecycle Environments inside their respective Content-Views to the previous version:
+```
+foreman_organization: "Org1"
+foreman_content_view: "content-view1"
+foreman_lifecycle_environments:
+  - "Dev"
+  - "QA"
+  - "Prod"
+
+```
+
+The role would take the Dev, QA and Prod Lifecycle Environments to Content-View version N-1.  If, prior to role runtime, the versions were: Prod=10, QA=11, and Dev=12, the result at the end of the run would be: Prod=9, QA=10, and Dev=11.  If that Content-View version does not exist it will select the next lowest Content-View version.  If there are none lower, it will exit with a message saying such.

roles/content_view_rollback/defaults/main.yml

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+---
+# defaults file for content_view_promotion_rollback_publish
+FOREMAN_VALIDATE_CERTS: true

roles/content_view_rollback/tasks/main.yml

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+---
+# get data on the current content-view
+- name: "Gather Data For Current Content-View From Foreman"
+  theforeman.foreman.resource_info:
+    username: "{{ foreman_user }}"
+    password: "{{ foreman_password }}"
+    server_url: "{{ foreman_server_url }}"
+    organization: "{{ foreman_organization }}"
+    validate_certs: "{{ foreman_validate_certs }}"
+    resource: content_views
+    search: name = "{{ foreman_content_view }}"
+  register: content_view_data
+
+# get data on the current content-view version
+- name: "Gather Data For Current Content-View Versions From Foreman"
+  theforeman.foreman.resource_info:
+    username: "{{ foreman_user }}"
+    password: "{{ foreman_password }}"
+    server_url: "{{ foreman_server_url }}"
+    organization: "{{ foreman_organization }}"
+    validate_certs: "{{ foreman_validate_certs }}"
+    resource: content_view_versions
+    params:
+      content_view_id: "{{ content_view_data.resources[0].id }}"
+  register: version_information
+
+# creates a dictionary with data formatted as such {'Prod':'11.0'}
+- name: "Build Dictionary With Lifecycle Envrionment And Version Number"
+  set_fact:
+    environments: "{{ environments | default({}) | combine ({item[1].name : item[0].name.split()[-1]}) }}"
+  with_subelements:
+    - "{{ version_information.resources }}"
+    - environments
+
+# create list of content-view versions
+- name: "Build List of All Versions of Content-View"
+  set_fact:
+    cv_versions: "{{ cv_versions | default([]) + [item.major] }}"
+  with_items: "{{ version_information.resources }}"
+
+# set the highest version to zero so that we don't use previous Content-View settings
+- name: "Set Lowest Version to 0"
+  set_fact:
+    lowest_version: 0
+
+# set highest number
+- name: "Set the Lowest Version of the Content-View Currently Available"
+  set_fact: 
+    lowest_version: "{{ cv_versions | min }}"
+
+# add one to each of the version numbers
+- name: "Update Facts With Decremented Content-View Version Numbers"
+  set_fact:
+    new_environments: "{{ new_environments | default({}) | combine({item.key: item.value|int - 1.0 }) }}"
+  with_dict: "{{ environments }}"
+
+# check if each of the N-1 versions exist
+- name: "Check to make sure previous version exists"
+  set_fact: 
+    non_environments: "{{ non_environments | default({}) | combine({item.key: item.value }) }}"
+  with_dict: "{{ new_environments }}"
+  when: item.value not in cv_versions
+
+- name: "Check for next closest, lower version"
+  include_tasks: version.yml
+  with_dict: "{{ non_environments | default({}) }}"
+  loop_control:
+    loop_var: version
+
+# check if each of the N-1 versions exist
+- name: "Check to make sure previous version exists"
+  fail:
+    msg: "There is no version lower than {{ item.value }} to roll back to for Content-View {{ item.key }}.  Stopping execution."
+  with_dict: "{{ new_environments }}"
+  when: item.value not in cv_versions
+
+# only promote environments defined in the vars
+- name: "Rollback Environments to Version N-1"
+  theforeman.foreman.content_view_version:
+    username: "{{ foreman_user }}"
+    password: "{{ foreman_password }}"
+    server_url: "{{ foreman_server_url }}"
+    organization: "{{ foreman_organization }}"
+    validate_certs: "{{ foreman_validate_certs }}"
+    content_view: "{{ foreman_content_view }}"
+    # dictionaries aren't ordered and Foreman doesn't want you promoting things out of order
+    # but we're promoting them all so we just override that behavior
+    force_promote: true
+    lifecycle_environments: "{{ item.key }}"
+    version: "{{ item.value }}"
+  with_dict: "{{ new_environments }}"
+  when: item.key in foreman_lifecycle_environments

roles/content_view_rollback/tasks/version.yml

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+---
+# reset the var value to the next lowest value
+# reversing the list and iterating downwards until first match would be more efficient
+- name: "Get closest lower version"
+  set_fact:
+    new_environments: "{{ new_environments | combine({version.key: item}) }}"
+  with_items: "{{ cv_versions | sort | list }}"
+  when: item | int < version.value | int