Inherit calling Ansible's environment when running ceph-ansible

When config-download runs ceph-ansible it does so by calling
Ansible from within Ansible. This change adds a new boolean,
ceph_ansible_inherits_calling_ansible_environment (default:
true), which passes all ANSIBLE_* environment variables to
the nested Ansible execution. If a config-download user
exported a variable, e.g. ANSIBLE_PRIVATE_KEY_FILE, then
they might be surprised if they got to the Ceph installation
and it failed because Ansible was unable to SSH into the
target nodes because it didn't have that environment variable
set. Rather than require the user to know about the nested
execution and use the CephAnsibleEnvironmentVariables parameter,
assume they want the same variables passed.

Required TripleO defaults for ceph-ansible still take precedence
over config-download environment variables; ANSIBLE_ROLES_PATH
still refers to ceph-ansible roles, not config-download roles.
CephAnsibleEnvironmentVariables takes precedence over both the
calling Ansible environment variables and TripleO defaults for
ceph-ansible.

Change-Id: I428f6deb416b540dae552b5fc7a778cbc7505e8c

tripleo_ansible/roles/tripleo-ceph-common/defaults/main.yml

@@ -144,3 +144,4 @@ openstack_config: true
 pools: []
 ntp_service_enabled: false
 generate_fsid: false
+ceph_ansible_inherits_calling_ansible_environment: true

tripleo_ansible/roles/tripleo-ceph-common/tasks/main.yml

@@ -43,3 +43,22 @@
     ansible_user_dir: "{{ lookup('env', 'HOME') }}"
   when:
     - ansible_user_dir is undefined
+
+- name: set default for calling_ansible_environment_variables
+  set_fact:
+    calling_ansible_environment_variables: []
+
+- when: ceph_ansible_inherits_calling_ansible_environment
+  block:
+    - name: get all ansible environment variables
+      shell: "env | grep ANSIBLE_"
+      register: env_shell_output
+      ignore_errors: true
+    - name: set calling_ansible_environment_variables
+      set_fact:
+        calling_ansible_environment_variables: "{{ env_shell_output.stdout_lines }}"
+      when:
+        - env_shell_output.rc is defined
+        - env_shell_output.rc == 0
+        - env_shell_output.stdout_lines is defined
+        - (env_shell_output.stdout_lines|length) > 0

tripleo_ansible/roles/tripleo-ceph-run-ansible/tasks/main.yml

@@ -26,6 +26,7 @@
 - name: set ceph-ansible command list
   set_fact:
     ceph_ansible_command_list:
+      - "{{ calling_ansible_environment_variables|join(' ') }}"
       - ANSIBLE_ACTION_PLUGINS=/usr/share/ceph-ansible/plugins/actions/
       - ANSIBLE_CALLBACK_PLUGINS=/usr/share/ceph-ansible/plugins/callback/
       - ANSIBLE_ROLES_PATH=/usr/share/ceph-ansible/roles/

tripleo_ansible/roles/tripleo-ceph-uuid/tasks/gather.yml

@@ -17,6 +17,7 @@
 - name: build nodes-uuid command as list
   set_fact:
     nodes_uuid_list:
+      - "{{ calling_ansible_environment_variables|join(' ') }}"
       - ANSIBLE_LOG_PATH="{{ playbook_dir }}/ceph-ansible/nodes_uuid_command.log"
       - ANSIBLE_SSH_CONTROL_PATH_DIR="{{ playbook_dir }}/ceph-ansible/"
       - ANSIBLE_CONFIG="{{ playbook_dir }}/ansible.cfg"