Add maria/mysql support

Does not install maria or mysql, but will work if it is already
installed.

re #4517

example-source/playbook.yml

@@ -1,7 +1,7 @@
 ---
 - hosts: all
   roles:
-    - pulp3-postgresql
+    - pulp3-database
     - pulp3-workers
     - pulp3-resource-manager
     - pulp3-webserver

example-use/playbook.yml

@@ -1,7 +1,7 @@
 ---
 - hosts: all
   roles:
-    - pulp3-postgresql
+    - pulp3-database
     - pulp3-workers
     - pulp3-resource-manager
     - pulp3-webserver

roles/pulp3-database/README.md

@@ -0,0 +1,45 @@
+pulp3-database
+================
+
+Optionally install a database, then configure for Pulp.
+
+More specifically, this role does the following:
+
+1. Call the external role to install a database if `pulp_install_db` is true.
+2. Install the Python bindings to interact with the specified database.
+3. Create and run migrations.
+
+Role Variables:
+---------------
+
+* `pulp_database_config`: Defines how Pulp will talk to PostgreSQL. Default values are constructed
+*                         from the other variables defined here. See `defaults/main.yml`.
+* `pulp_db_host`: Host of the database instance. Defaults to localhost.
+* `pulp_db_name`: Name of the database, defaults to pulp.
+* `pulp_db_user`: Database user, should match linux user. Defaults to pulp
+* `pulp_db_password`: Password for Postgresql user. Defaults to pulp
+* `pulp_db_backend`: Django setting for db backend. for databasePassword for Postgresql user.
+                     Defaults to "django.db.backends.postgresql_psycopg2"
+* `pulp_install_db`: Defaults to true. Whether to install a database.
+
+Shared Variables:
+-----------------
+
+* `ansible_python_interpreter`: **Required**. Path to the Python interpreter.
+
+This role **is tightly coupled** with the required the `pulp3` role and uses some of
+variables which are documented in that role:
+
+* `pulp_user`
+* `pulp_install_dir`
+* `pulp_install_plugins`
+* `pulp_default_admin_password`
+
+
+This role optionally depends on other roles to install a database.
+
+Operating Systems Variables:
+----------------------------
+
+Each currently supported operating system has a matching file in the "vars"
+directory.

roles/pulp3-database/defaults/main.yml

@@ -0,0 +1,14 @@
+---
+pulp_install_db: true
+pulp_db_host: localhost
+pulp_db_name: pulp
+pulp_db_user: pulp
+pulp_db_password: pulp
+pulp_db_backend: django.db.backends.postgresql_psycopg2
+pulp_database_config:
+  default:
+    HOST: "{{ pulp_db_host }}"
+    ENGINE: "{{ pulp_db_backend }}"
+    NAME: "{{ pulp_db_name}}"
+    USER: "{{ pulp_db_user }}"
+    PASSWORD: "{{ pulp_db_password }}"

roles/pulp3-database/tasks/install_mysql.yml

@@ -0,0 +1,3 @@
+---
+- fail:
+    msg: "MySQL/Maria installation is not implented. Please install manually and set pulp_install_database to false."

roles/pulp3-database/tasks/install_postgres.yml

@@ -0,0 +1,19 @@
+---
+- block:
+    - name: Install SCL package
+      package:
+        name: 'centos-release-scl'
+        state: present
+      when: ansible_distribution == 'CentOS'
+
+    - name: Set listen addresses
+      set_fact:
+        postgresql_global_config_options:
+          - option: listen_addresses
+            value: "*"
+      when: pulp_db_host != 'localhost'
+
+    - name: Install and configure PostgreSQL
+      import_role:
+        name: geerlingguy.postgresql
+  become: yes

roles/pulp3-postgresql/tasks/main.yml → roles/pulp3-database/tasks/main.yml

@@ -4,28 +4,15 @@
   tags:
     - always
 
-- block:
-
-    - name: Install SCL package
-      package:
-        name: 'centos-release-scl'
-        state: present
-      when: ansible_distribution == 'CentOS'
-
-    - name: Set listen addresses
-      set_fact:
-        postgresql_global_config_options:
-          - option: listen_addresses
-            value: "*"
-      when: pulp_postgresql_host != 'localhost'
-
-    - name: Install and configure PostgreSQL
-      import_role:
-        name: geerlingguy.postgresql
-
-
-  become: true
-  when: pulp_install_postgresql
+- import_tasks: install_postgres.yml
+  when:
+    - pulp_install_db
+    - pulp_db_type == 'postgres'
+
+- import_tasks: install_mysql.yml
+  when:
+    - pulp_install_db
+    - pulp_db_type == 'mysql'
 
 - meta: flush_handlers
 

roles/pulp3/tasks/install.yml

@@ -80,7 +80,7 @@
         state: present
         virtualenv: '{{ pulp_install_dir }}'
         virtualenv_command: '{{ pulp_python_interpreter }} -m venv'
-      when: pulp_db_type == "mysql"
+      when: pulp_db_type == "mariadb"
 
     - name: Install pulpcore package from source
       pip: