feat: add postgres_exporter_setup variable

defaults/main.yml

@@ -1,4 +1,6 @@
 ---
+postgres_exporter_setup: 'install'
+
 # See available releases: https://github.com/prometheus-community/postgres_exporter/releases
 postgres_exporter_version: '0.18.1'
 postgres_exporter_archive_name: 'postgres_exporter-{{ postgres_exporter_version }}.{{ __postgres_exporter_os }}-{{ __postgres_exporter_architecture }}'

handlers/main.yml

@@ -7,5 +7,11 @@
     state: 'restarted'
   when: not ansible_check_mode
 
+- name: 'Linux | Systemd daemon-reload'
+  become: true
+  ansible.builtin.systemd:
+    daemon_reload: true
+  when: not ansible_check_mode
+
 - name: 'Windows | Restart the Postgres Exporter scheduled task'
   ansible.windows.win_shell: schtasks /end /tn 'Postgres Exporter'; schtasks /run /tn 'Postgres Exporter'

meta/argument_specs.yml

@@ -6,6 +6,14 @@ argument_specs:
       - 'An Ansible role to install, configure and update the L(Postgres Exporter,https://github.com/prometheus-community/postgres_exporter).'
     author: 'Melekhin Anton'
     options:
+      postgres_exporter_setup:
+        type: 'str'
+        description: ''
+        choices:
+          - 'install'
+          - 'upgrade'
+          - 'uninstall'
+        default: 'install'
       postgres_exporter_version:
         type: 'str'
         description: 'The version of Postgres Exporter to install.'

molecule/uninstall/converge.yml

@@ -0,0 +1,6 @@
+---
+- name: 'Converge'
+  hosts: all
+  roles:
+    - role: antmelekhin.postgres_exporter
+      postgres_exporter_setup: 'uninstall'

molecule/uninstall/molecule.yml

@@ -0,0 +1,20 @@
+---
+role_name_check: 2
+dependency:
+  name: 'galaxy'
+  enabled: true
+driver:
+  name: 'docker'
+platforms:
+  - name: 'postgres_exporter-${IMAGE:-docker-systemd}-${TAG:-ubuntu-22.04}${TOX_ENVNAME}'
+    image: '${NAMESPACE:-antmelekhin}/${IMAGE:-docker-systemd}:${TAG:-ubuntu-22.04}'
+    volumes:
+      - '/sys/fs/cgroup:/sys/fs/cgroup:rw'
+      - '/var/lib/containerd'
+    cgroupns_mode: 'host'
+    privileged: true
+    pre_build_image: true
+provisioner:
+  name: 'ansible'
+verifier:
+  name: 'ansible'

molecule/uninstall/prepare.yml

@@ -0,0 +1,14 @@
+---
+- name: 'Prepare an Ansible host for GitHub Actions'
+  hosts: localhost
+  tasks:
+    - name: 'Install tar for tasks delegated to the localhost'
+      community.general.apk:
+        name: 'tar'
+        update_cache: true
+      when: ansible_os_family == 'Alpine'
+
+- name: 'Install the Postgres Exporter'
+  hosts: all
+  roles:
+    - role: antmelekhin.postgres_exporter

molecule/uninstall/verify.yml

@@ -0,0 +1,28 @@
+---
+- name: 'Verify'
+  hosts: all
+  gather_facts: false
+
+  tasks:
+    - name: 'Check if Postgres Exporter is installed'
+      ansible.builtin.stat:
+        path: '/usr/local/bin/postgres_exporter'
+      register: __postgres_exporter_is_installed
+      failed_when: __postgres_exporter_is_installed['stat']['exists'] | bool
+      check_mode: true
+
+    - name: 'Check if Postgres Exporter service is running'
+      ansible.builtin.systemd:
+        name: 'postgres_exporter'
+        state: 'started'
+        enabled: true
+      register: __postgres_exporter_service
+      failed_when: __postgres_exporter_service is changed
+      check_mode: true
+
+    - name: 'Check web_config.yaml does not exist'
+      ansible.builtin.stat:
+        path: '/etc/postgres_exporter/web_config.yaml'
+      register: __postgres_exporter_config
+      failed_when: __postgres_exporter_config['stat']['exists'] | bool
+      check_mode: true

tasks/Linux/install.yml

@@ -15,9 +15,9 @@
   when:
     - not __postgres_exporter_is_installed.stat.exists or
       ( __postgres_exporter_version_check.stderr_lines | length and
-      postgres_exporter_version not in __postgres_exporter_version_check.stderr_lines[0].split()[2] ) or
+      postgres_exporter_version not in __postgres_exporter_version_check.stderr_lines[0].split()[2] and 'upgrade' in postgres_exporter_setup ) or
       ( __postgres_exporter_version_check.stdout_lines | length and
-      postgres_exporter_version not in __postgres_exporter_version_check.stdout_lines[0].split()[2] )
+      postgres_exporter_version not in __postgres_exporter_version_check.stdout_lines[0].split()[2] and 'upgrade' in postgres_exporter_setup )
   block:
     - name: 'Linux | Download the Postgres Exporter archive to a local folder'
       become: false

tasks/Linux/uninstall.yml

@@ -0,0 +1,42 @@
+---
+- name: 'Linux | Uninstall the Postgres Exporter'
+  become: true
+  block:
+    - name: 'Linux | Check if Postgres Exporter systemd service is existed'
+      ansible.builtin.stat:
+        path: '/etc/systemd/system/postgres_exporter.service'
+      register: __postgres_exporter_unit_file
+
+    - name: 'Linux | Ensure the Postgres Exporter is stopped and disabled at boot'
+      ansible.builtin.systemd:
+        name: 'postgres_exporter'
+        state: 'stopped'
+        enabled: false
+      when: __postgres_exporter_unit_file.stat.exists
+
+    - name: 'Linux | Remove the Postgres Exporter systemd service'
+      ansible.builtin.file:
+        path: '/etc/systemd/system/postgres_exporter.service'
+        state: 'absent'
+      notify: 'Linux | Systemd daemon-reload'
+
+    - name: 'Linux | Remove the Postgres Exporter binary'
+      ansible.builtin.file:
+        path: '{{ postgres_exporter_install_path }}/postgres_exporter'
+        state: 'absent'
+
+    - name: 'Linux | Remove a Postgres Exporter configuration directory'
+      ansible.builtin.file:
+        path: '{{ postgres_exporter_config_path }}'
+        state: 'absent'
+
+    - name: 'Linux | Remove a Postgres Exporter user'
+      ansible.builtin.user:
+        name: '{{ postgres_exporter_user }}'
+        state: 'absent'
+        remove: true
+
+    - name: 'Linux | Remove a Postgres Exporter group'
+      ansible.builtin.group:
+        name: '{{ postgres_exporter_group }}'
+        state: 'absent'

tasks/Win32NT/install.yml

@@ -15,9 +15,9 @@
   when:
     - not __postgres_exporter_is_installed.stat.exists or
       ( __postgres_exporter_version_check.stderr_lines | length and
-      postgres_exporter_version not in __postgres_exporter_version_check.stderr_lines[0].split()[2] ) or
+      postgres_exporter_version not in __postgres_exporter_version_check.stderr_lines[0].split()[2] and 'upgrade' in postgres_exporter_setup ) or
       ( __postgres_exporter_version_check.stdout_lines | length and
-      postgres_exporter_version not in __postgres_exporter_version_check.stdout_lines[0].split()[2] )
+      postgres_exporter_version not in __postgres_exporter_version_check.stdout_lines[0].split()[2] and 'upgrade' in postgres_exporter_setup )
   block:
     - name: 'Windows | Download the Postgres Exporter archive to a local folder'
       become: false

tasks/main.yml

@@ -1,9 +1,16 @@
 ---
 - name: 'Prepare for installing the Postgres Exporter'
   ansible.builtin.include_tasks: '{{ ansible_system }}/pre-install.yml'
+  when: postgres_exporter_setup in ['install','upgrade']
 
 - name: 'Install the Postgres Exporter'
   ansible.builtin.include_tasks: '{{ ansible_system }}/install.yml'
+  when: postgres_exporter_setup in ['install','upgrade']
 
 - name: 'Configure the Postgres Exporter'
   ansible.builtin.include_tasks: '{{ ansible_system }}/configure.yml'
+  when: postgres_exporter_setup in ['install','upgrade']
+
+- name: 'Uninstall the Postgres Exporter'
+  ansible.builtin.include_tasks: '{{ ansible_system }}/uninstall.yml'
+  when: postgres_exporter_setup in ['uninstall']