propagate support for 'latest' version specifier from ansible-prometheus

.travis.yml

@@ -16,7 +16,7 @@ matrix:
 install:
   - pip3 install tox-travis git-semver
 script:
-  - tox
+  - ./.travis/test.sh
 deploy:
   provider: script
   skip_cleanup: true

.travis/test.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+if [ "$TRAVIS_PULL_REQUEST" == "false" ]; then
+	tox -- molecule test --all --destroy never
+else
+	tox -- molecule test -s default --destroy always
+	if [ -d "./molecule/alternative" ]; then
+		tox -- molecule test -s alternative --destroy never
+	fi
+fi

README.md

@@ -24,7 +24,7 @@ All variables which can be overridden are stored in [defaults/main.yml](defaults
 
 | Name           | Default Value | Description                        |
 | -------------- | ------------- | -----------------------------------|
-| `alertmanager_version` | 0.16.1 | Alertmanager package version |
+| `alertmanager_version` | 0.16.1 | Alertmanager package version. Also accepts `latest` as parameter. |
 | `alertmanager_listen_address` | '0.0.0.0:9093' | Address on which alertmanager will be listening |
 | `alertmanager_external_url` | 'http://localhost:9093/' | External address on which alertmanager is available. Useful when behind reverse proxy. Ex. example.org/alertmanager |
 | `alertmanager_config_dir` | /etc/alertmanager | Path to directory with alertmanager configuration |

molecule/latest/molecule.yml

@@ -0,0 +1,36 @@
+---
+dependency:
+  name: galaxy
+driver:
+  name: docker
+lint:
+  name: yamllint
+platforms:
+  - name: stretch
+    image: paulfantom/debian-molecule:9
+    docker_host: "${DOCKER_HOST:-unix://var/run/docker.sock}"
+    privileged: true
+    volumes:
+      - /sys/fs/cgroup:/sys/fs/cgroup:ro
+  - name: fedora
+    image: paulfantom/fedora-molecule:27
+    docker_host: "${DOCKER_HOST:-unix://var/run/docker.sock}"
+    privileged: true
+    volumes:
+      - /sys/fs/cgroup:/sys/fs/cgroup:ro
+provisioner:
+  name: ansible
+  lint:
+    name: ansible-lint
+  playbooks:
+    create: ../default/create.yml
+    prepare: ../default/prepare.yml
+    converge: playbook.yml
+    destroy: ../default/destroy.yml
+scenario:
+  name: latest
+verifier:
+  name: testinfra
+  lint:
+    name: flake8
+    enabled: true

molecule/latest/playbook.yml

@@ -0,0 +1,8 @@
+---
+- name: Run role
+  hosts: all
+  any_errors_fatal: true
+  roles:
+    - ansible-alertmanager
+  vars:
+    alertmanager_version: latest

molecule/latest/tests/test_latest.py

@@ -0,0 +1,28 @@
+import pytest
+import os
+import testinfra.utils.ansible_runner
+
+testinfra_hosts = testinfra.utils.ansible_runner.AnsibleRunner(
+    os.environ['MOLECULE_INVENTORY_FILE']).get_hosts('all')
+
+
+@pytest.mark.parametrize("files", [
+    "/etc/systemd/system/prometheus.service",
+    "/usr/local/bin/prometheus",
+    "/usr/local/bin/promtool"
+])
+def test_files(host, files):
+    f = host.file(files)
+    assert f.exists
+    assert f.is_file
+
+
+def test_service(host):
+    s = host.service("prometheus")
+    # assert s.is_enabled
+    assert s.is_running
+
+
+def test_socket(host):
+    s = host.socket("tcp://0.0.0.0:9090")
+    assert s.is_listening

tasks/install.yml

@@ -27,26 +27,34 @@
 
 - name: download alertmanager binary to local folder
   become: false
-  unarchive:
-    src: "https://github.com/prometheus/alertmanager/releases/download/v{{ alertmanager_version }}/alertmanager-{{ alertmanager_version }}.linux-{{ go_arch_map[ansible_architecture] | default(ansible_architecture) }}.tar.gz"
-    dest: "/tmp"
-    remote_src: true
-    creates: "/tmp/alertmanager-{{ alertmanager_version }}.linux-{{ go_arch_map[ansible_architecture] | default(ansible_architecture) }}/alertmanager"
-  register: _download_binary
-  until: _download_binary is succeeded
+  get_url:
+    url: "https://github.com/prometheus/alertmanager/releases/download/v{{ alertmanager_version }}/alertmanager-{{ alertmanager_version }}.linux-{{ go_arch }}.tar.gz"
+    dest: "/tmp/alertmanager-{{ alertmanager_version }}.linux-{{ go_arch }}.tar.gz"
+    checksum: "sha256:{{ alertmanager_checksum }}"
+  register: _download_archive
+  until: _download_archive is succeeded
   retries: 5
   delay: 2
-  # run_once: true
+  # run_once: true # <-- this can't be set due to multi-arch support
+  delegate_to: localhost
+  check_mode: false
+
+- name: unpack alertmanager binaries
+  become: false
+  unarchive:
+    src: "/tmp/alertmanager-{{ alertmanager_version }}.linux-{{ go_arch }}.tar.gz"
+    dest: "/tmp"
+    creates: "/tmp/alertmanager-{{ alertmanager_version }}.linux-{{ go_arch }}/alertmanager"
   delegate_to: localhost
   check_mode: false
 
 - name: propagate alertmanager and amtool binaries
   copy:
-    src: "/tmp/alertmanager-{{ alertmanager_version }}.linux-{{ go_arch_map[ansible_architecture] | default(ansible_architecture) }}/{{ item }}"
+    src: "/tmp/alertmanager-{{ alertmanager_version }}.linux-{{ go_arch }}/{{ item }}"
     dest: "/usr/local/bin/{{ item }}"
     mode: 0755
-    owner: alertmanager
-    group: alertmanager
+    owner: root
+    group: root
   with_items:
     - alertmanager
     - amtool
@@ -76,12 +84,3 @@
   when:
     - ansible_version.full is version_compare('2.4', '>=')
     - ansible_selinux.status == "enabled"
-
-- name: remove alertmanager binaries from old location
-  file:
-    path: "{{ item }}"
-    state: absent
-  with_items:
-    - /opt/alertmanager/alertmanager
-    - /opt/alertmanager/amtool
-    - /opt/alertmanager

tasks/preflight.yml

@@ -1,4 +1,49 @@
 ---
+- name: Assert usage of systemd as an init system
+  assert:
+    that: ansible_service_mgr == 'systemd'
+    msg: "This module only works with systemd"
+
+- name: Get systemd version
+  command: systemctl --version
+  changed_when: false
+  check_mode: false
+  register: __systemd_version
+  tags:
+    - skip_ansible_lint
+
+- name: Set systemd version fact
+  set_fact:
+    alertmanager_systemd_version: "{{ __systemd_version.stdout_lines[0].split(' ')[-1] }}"
+
+- block:
+    - name: Get latest release
+      uri:
+        url: "https://api.github.com/repos/prometheus/alertmanager/releases/latest"
+        method: GET
+        return_content: true
+        status_code: 200
+        body_format: json
+        validate_certs: false
+        user: "{{ lookup('env', 'GH_USER') | default(omit) }}"
+        password: "{{ lookup('env', 'GH_TOKEN') | default(omit) }}"
+      no_log: true
+      register: _latest_release
+      until: _latest_release.status == 200
+      retries: 5
+
+    - name: "Set prometheus version to {{ _latest_release.json.tag_name[1:] }}"
+      set_fact:
+        alertmanager_version: "{{ _latest_release.json.tag_name[1:] }}"
+  when: alertmanager_version == "latest"
+
+- name: "Get checksum for {{ go_arch }} architecture"
+  set_fact:
+    alertmanager_checksum: "{{ item.split(' ')[0] }}"
+  with_items:
+    - "{{ lookup('url', 'https://github.com/prometheus/alertmanager/releases/download/v' + alertmanager_version + '/sha256sums.txt', wantlist=True) | list }}"
+  when: "('linux-' + go_arch + '.tar.gz') in item"
+
 - name: Backward compatibility of variable [part 1]
   set_fact:
     alertmanager_config_flags_extra: "{{ alertmanager_cli_flags }}"

vars/main.yml

@@ -5,3 +5,5 @@ go_arch_map:
   aarch64: 'arm64'
   armv7l: 'armv7'
   armv6l: 'armv6'
+
+go_arch: "{{ go_arch_map[ansible_architecture] | default(ansible_architecture) }}"