add requirements file,hosts.ini and README

roles/geerlingguy.postgresql/tasks/configure.yml

@@ -16,7 +16,7 @@
     group: "{{ postgresql_group }}"
     mode: 0600
   notify: restart postgresql
-  when: postgresql_hba_entries
+  when: postgresql_hba_entries | length > 0
 
 - name: Ensure PostgreSQL unix socket dirs exist.
   file:

roles/geerlingguy.postgresql/tasks/main.yml

@@ -17,9 +17,7 @@
     name: "{{ postgresql_daemon }}"
     state: "{{ postgresql_service_state }}"
     enabled: "{{ postgresql_service_enabled }}"
-  when: not docker_enabled
-
 
 # Configure PostgreSQL.
-- import_tasks: databases.yml
 - import_tasks: users.yml
+- import_tasks: databases.yml

roles/geerlingguy.postgresql/tasks/setup-RedHat.yml

@@ -1,12 +1,16 @@
 ---
 - name: Ensure PostgreSQL packages are installed.
-  package:
+  yum:
     name: "{{ postgresql_packages }}"
     state: present
     enablerepo: "{{ postgresql_enablerepo | default(omit, true) }}"
+    # Don't let postgresql-contrib cause the /usr/bin/python symlink
+    # to be installed, which breaks later Ansible runs on Fedora 30,
+    # and affects system behavior in multiple ways.
+    exclude: python-unversioned-command
 
 - name: Ensure PostgreSQL Python libraries are installed.
-  package:
+  yum:
     name: "{{ postgresql_python_library }}"
     state: present
     enablerepo: "{{ postgresql_enablerepo | default(omit, true) }}"

roles/geerlingguy.postgresql/tasks/variables.yml

@@ -6,7 +6,13 @@
 
 - name: Include OS-specific variables (RedHat).
   include_vars: "{{ ansible_os_family }}-{{ ansible_distribution_version.split('.')[0] }}.yml"
-  when: ansible_os_family == 'RedHat'
+  when:
+  - ansible_os_family == 'RedHat'
+  - ansible_distribution != 'Fedora'
+
+- name: Include OS-specific variables (Fedora).
+  include_vars: "{{ ansible_distribution }}-{{ ansible_distribution_version.split('.')[0] }}.yml"
+  when: ansible_distribution == 'Fedora'
 
 - name: Define postgresql_packages.
   set_fact: