Generate reproducer script for container image prepare

Change-Id: I2477deef398a6fa7c24262447dbf673b5063592f

roles/tripleo_container_image_prepare/README.md

@@ -20,6 +20,7 @@ Role Variables
 * `tripleo_container_image_prepare_home_dir`: (String) Home directory for the undercloud user. Default: "{{ ansible_env.HOME }}"
 * `tripleo_container_image_prepare_output_env_file`: (String) File to write heat environment file which specifies all image parameters. Default is not set.
 * `tripleo_container_image_prepare_output_roles_file`: (String) Roles file path on the remote system. Default is not set.
+* `tripleo_container_image_prepare_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_container_image_prepare_timeout`: (Number) Amount of time to wait for the command to conplete. Default: 1800
 
 Output Variables

roles/tripleo_container_image_prepare/defaults/main.yml

@@ -14,4 +14,5 @@ tripleo_container_image_prepare_log_output: false
 tripleo_container_image_prepare_log_combine: true
 tripleo_container_image_prepare_output_env_file:
 tripleo_container_image_prepare_roles_file:
+tripleo_container_image_prepare_scripts: "{{ tripleo_generate_scripts | default(False) }}"
 tripleo_container_image_prepare_timeout: 1800

roles/tripleo_container_image_prepare/tasks/main.yml

@@ -19,6 +19,12 @@
     var: _prepare_cmd
   when: tripleo_container_image_prepare_debug|bool
 
+- name: Write reproducer script
+  tripleo_shell_script:
+    dest: "{{ tripleo_container_image_prepare_home_dir }}/tripleo_container_prepare.sh"
+    shell_command: "{{ _prepare_cmd }}"
+  when: tripleo_container_image_prepare_scripts|bool
+
 - name: Container image prepare
   shell: "{{ _prepare_cmd }}"  # noqa 305
   async: "{{ tripleo_container_image_prepare_timeout }}"