Generate node unprovision script if wanted

This script might be handy in some cases - for instance if the node
provisionning is failing, it's always better to unprovision things
before retrying.

Change-Id: Ie067226b509fbc1186be956f20866b8104e555ad

roles/tripleo_overcloud_node_unprovision/README.md

@@ -14,6 +14,8 @@ Role Variables
 * `tripleo_overcloud_node_unprovision_all`: (Boolean) Unprovision every instance in the deployment. Defaults: false
 * `tripleo_overcloud_node_unprovision_debug`: (Boolean) Flag to print out the delete command. Default: False
 * `tripleo_overcloud_node_unprovision_deployment_file`: (String) REQUIRED. Configuration file describing the baremetal deployment.
+* `tripleo_overcloud_node_unprovision_generate_scripts`: (Boolean) Write out a shell script that can be used to reproduce the command being executed. By default uses the value of `tripleo_generate_scripts` or False if tripleo_generate_scripts is not defined.
+* `tripleo_overcloud_node_unprovision_generate_scripts_only`: (Boolean) Do not run the actual command - to be used in conjunction with `tripleo_overcloud_node_unprovision_generate_scripts`. By default uses the value of `tripleo_generate_scripts_only` or False if `tripleo_generate_scripts_only` is not defined.
 * `tripleo_overcloud_node_unprovision_home_dir`: (String) Home directory to where the command is run from. Default: "{{ ansible_env.HOME }}"
 * `tripleo_overcloud_node_unprovision_log_combine`: (Boolean) Flag to enable capturing stderr with stdout. Default: true
 * `tripleo_overcloud_node_unprovision_log_output`: (Boolean) Flag to enable logging to a file. Since the output of this command can be large, it is not recommended to disable this. Default: true

roles/tripleo_overcloud_node_unprovision/defaults/main.yml

@@ -4,6 +4,8 @@ openstack_bin: openstack
 tripleo_overcloud_node_unprovision_all: false
 tripleo_overcloud_node_unprovision_debug: false
 tripleo_overcloud_node_unprovision_deployment_file:
+tripleo_overcloud_node_unprovision_generate_scripts: "{{ tripleo_generate_scripts|default(False) }}"
+tripleo_overcloud_node_unprovision_generate_scripts_only: "{{ tripleo_generate_scripts_only|default(False) }}"
 tripleo_overcloud_node_unprovision_home_dir: "{{ ansible_env.HOME }}"
 tripleo_overcloud_node_unprovision_log: "{{ tripleo_overcloud_node_unprovision_home_dir }}/CHANGEME.log"
 tripleo_overcloud_node_unprovision_log_combine: true

roles/tripleo_overcloud_node_unprovision/tasks/main.yml

@@ -32,6 +32,14 @@
       debug:
         var: _unprovision_env
 
+- name: write reproducer script
+  tripleo_shell_script:
+    dest: "{{ tripleo_config_generate_home_dir }}/tripleo_overcloud_node_unprovision.sh"
+    shell_command: "{{ _unprovision_cmd }}"
+    shell_environment: "{{ _unprovision_env }}"
+  when:
+    - tripleo_overcloud_node_unprovision_generate_scripts|bool
+
 - name: overcloud node unprovision
   shell: "{{ _unprovision_cmd }}"  # noqa 305
   environment: "{{ _unprovision_env }}"
@@ -43,7 +51,9 @@
   async: "{{ tripleo_overcloud_node_unprovision_timeout }}"
   poll: "{{ tripleo_overcloud_node_unprovision_poll }}"
   changed_when: false
-  when: not ansible_check_mode|bool
+  when:
+    - not ansible_check_mode|bool
+    - not tripleo_overcloud_node_unprovision_generate_scripts_only|bool
 
 - name: Set output fact
   when: