Update ocp-upgrade playbook

Fixes: ocp-power-automation#43
Signed-off-by: Prajyot Parab <prajyot.parab@ibm.com>

examples/upgrade_vars.yaml

@@ -1,5 +1,6 @@
 ---
-upgrade_image: ""  #OCP upgrade image
+upgrade_version: ""  #OCP upgrade version eg. 4.5.4
+upgrade_channel: ""  #OCP channel having required upgrade version available for cluster upgrade (stable-4.x, fast-4.x, candidate-4.x) eg. stable-4.5
 pause_time: 90     #Pauses playbook execution for a set amount of time in minutes
 delay_time: 600    #Number of seconds to wait before starting to poll
 

playbooks/roles/ocp-upgrade/README.md

@@ -11,11 +11,12 @@ Requirements
 Role Variables
 --------------
 
-| Variable      | Required | Default | Comments                                                      |
-|---------------|----------|---------|---------------------------------------------------------------|
-| upgrade_image | no       | ""      | OCP upgrade image                                             |
-| pause_time    | no       | 90      | Pauses playbook execution for a set amount of time in minutes |
-| delay_time    | no       | 600     | Number of seconds to wait before starting to poll             |
+| Variable        | Required | Default    | Comments                                                      |
+|-----------------|----------|------------|---------------------------------------------------------------|
+| upgrade_version | no       | ""         | Set to a specific version eg. 4.5.4                        |
+| upgrade_channel | no       | ""         | Set to channel having required upgrade version available for cluster upgrade (stable-4.x, fast-4.x, candidate-4.x) eg. stable-4.5 |
+| pause_time      | no       | 90         | Pauses playbook execution for a set amount of time in minutes |
+| delay_time      | no       | 600        | Number of seconds to wait before starting to poll             |
 
 Dependencies
 ------------
@@ -30,7 +31,7 @@ Example Playbook
       tasks:
         - include_role:
             name: ocp-upgrade
-          when: upgrade_image!= ""
+          when: upgrade_version != ""
 
 License
 -------

playbooks/roles/ocp-upgrade/defaults/main.yaml

@@ -1,7 +1,8 @@
 ---
 # defaults file
 
-upgrade_image: ""
+upgrade_version: ""
+upgrade_channel: ""
 pause_time: 90
 delay_time: 600
 

playbooks/roles/ocp-upgrade/tasks/main.yaml

@@ -1,8 +1,13 @@
 ---
 
+- name: Set upgrade channel
+  when: upgrade_channel != ""
+  shell: |
+    oc patch clusterversion/version -p '{"spec":{"channel":"{{ upgrade_channel }}"}}' --type=merge
+
 - name: Upgrade cluster
   shell: |
-    oc adm upgrade --force --to-image="{{ upgrade_image }}" --allow-explicit-upgrade
+    oc adm upgrade --to="{{ upgrade_version }}"
 
 - name: Waiting until upgrade completes
   pause:

playbooks/upgrade.yaml

@@ -4,5 +4,5 @@
   tasks:
     - include_role:
         name: ocp-upgrade
-      when: upgrade_image!= ""
+      when: upgrade_version != ""