iiab/roles/postgresql/tasks/install.yml

- name: Record (initial) disk space used
  shell: df -B1 --output=used / | tail -1
  register: df1


- name: 'Install packages: postgresql, postgresql-client, python3-psycopg2'
  package:
    name:
      - postgresql
      - postgresql-client
      - python3-psycopg2    # For Ansible modules {postgresql_db, postgresql_user} in Ansible collection community.postgresql -- used in moodle/tasks/install.yml
    state: present

- name: Run shell command "pg_config --version" to extract MAJOR version number -- strip off MINOR/PATCH version number(s)
  shell: pg_config --version | sed 's/^[^0-9]*//; s/[^0-9].*//'
  register: pg_config_version

- name: 'Dynamically set Ansible var "postgresql_version: {{ pg_config_version.stdout }}"'
  set_fact:
    postgresql_version: "{{ pg_config_version.stdout }}"

- name: Install /etc/systemd/system/postgresql-iiab.service from template (0644 by default)
  template:
    src: postgresql-iiab.service
    dest: /etc/systemd/system/postgresql-iiab.service

- name: Create PostgreSQL data dir /library/pgsql-iiab, owned by postgres:postgres (0700)
  file:
    state: directory
    path: /library/pgsql-iiab
    owner: postgres
    group: postgres
    mode: 0700

- name: Make sure locale {{ postgresql_locale }} is enabled    # en_US.UTF-8
  lineinfile:
    dest: /etc/locale.gen
    line: "{{ postgresql_locale }} UTF-8"

- name: Generate locales
  command: /usr/sbin/locale-gen

- name: Initialize the PostgreSQL db, creating /library/pgsql-iiab/pg_hba.conf
  #command: su - postgres -c "/usr/lib/postgresql/{{ postgresql_version }}/bin/initdb -E 'UTF-8' --locale={{ postgresql_locale }} -D /library/pgsql-iiab"
  command: /usr/lib/postgresql/{{ postgresql_version }}/bin/initdb -E 'UTF-8' --locale={{ postgresql_locale }} -D /library/pgsql-iiab
  args:
    creates: /library/pgsql-iiab/pg_hba.conf
  become: yes
  become_user: postgres

# - name: Initialize the PostgreSQL db, creating /library/pgsql-iiab/pg_hba.conf (OS's other than debuntu)
#   #command: su - postgres -c "/usr/bin/initdb -E 'UTF-8' --lc-collate={{ postgresql_locale }} --lc-ctype={{ postgresql_locale }} -D /library/pgsql-iiab"
#   command: /usr/bin/initdb -E 'UTF-8' --lc-collate={{ postgresql_locale }} --lc-ctype={{ postgresql_locale }} -D /library/pgsql-iiab
#   args:
#     creates: /library/pgsql-iiab/pg_hba.conf
#   become: yes
#   become_user: postgres
#   when: not is_debuntu

- name: Install /library/pgsql-iiab/postgresql.conf from template (postgres:postgres, 0640)
  template:
    backup: yes
    src: postgresql.conf.j2
    dest: /library/pgsql-iiab/postgresql.conf
    owner: postgres
    group: postgres
    mode: 0640

- name: Disable & Stop stock 'postgresql' (parent) systemd service
  systemd:
    name: postgresql
    state: stopped
    enabled: no

# Above parent service postgresql.service uses template postgresql@.service to
# start/stop` child service e.g. postgresql@11-main.service on Debian 10, or
# postgresql@13-main.service on Debian 11. So these 2 stanzas dont do anything:

# 'systemctl is-enabled postgresql@' shows 'indirect' before + after
#- name: Disable stock 'postgresql@' (template) if real Debian
#  systemd:
#    name: postgresql@
#    #state: stopped    # Error if you attempt to stop template
#    enabled: no        # Doesn't do anything
#  when: is_debian and not is_raspbian

# 'systemctl is-enabled postgresql@13-main.service' shows 'enabled-runtime' before + after
#- name: Disable & Stop stock 'postgresql@{{ postgresql_version }}-main.service' (child service) if real Debian
#  systemd:
#    name: "postgresql@{{ postgresql_version }}-main.service"
#    state: stopped    # Already done by parent above
#    enabled: no       # Doesn't do anything
#  when: is_debian and not is_raspbian


# RECORD PostgreSQL AS INSTALLED

- name: Record (final) disk space used
  shell: df -B1 --output=used / | tail -1
  register: df2

- name: Add 'postgresql_disk_usage = {{ df2.stdout|int - df1.stdout|int }}' to {{ iiab_ini_file }}
  ini_file:
    path: "{{ iiab_ini_file }}"    # /etc/iiab/iiab.ini
    section: postgresql
    option: postgresql_disk_usage
    value: "{{ df2.stdout|int - df1.stdout|int }}"

- name: "Set 'postgresql_installed: True'"
  set_fact:
    postgresql_installed: True

- name: "Add 'postgresql_installed: True' to {{ iiab_state_file }}"
  lineinfile:
    path: "{{ iiab_state_file }}"    # /etc/iiab/iiab_state.yml
    regexp: '^postgresql_installed'
    line: 'postgresql_installed: True'