Add ability to look up the latest docker-compose version from Github API

README.md

@@ -31,7 +31,7 @@ Variables to control the state of the `docker` service, and whether it should st
     docker_compose_version: "1.26.0"
     docker_compose_path: /usr/local/bin/docker-compose
 
-Docker Compose installation options.
+Docker Compose installation options. You can use `docker_compose_version: "latest"` to get the current latest version.
 
     docker_apt_release_channel: stable
     docker_apt_arch: amd64

defaults/main.yml

@@ -11,7 +11,10 @@ docker_restart_handler_state: restarted
 
 # Docker Compose options.
 docker_install_compose: true
-docker_compose_version: "1.26.0"
+docker_compose_version: "v2.11.1"
+docker_compose_version_api_url: "https://api.github.com/repos/docker/compose/releases/latest"
+docker_compose_arch: "{{ ansible_architecture }}"
+docker_compose_download_url: "https://github.com/docker/compose/releases/download/{{ docker_compose_version }}/docker-compose-linux-{{ docker_compose_arch }}"
 docker_compose_path: /usr/local/bin/docker-compose
 
 # Used only for Debian/Ubuntu. Switch 'stable' to 'edge' if needed.

tasks/docker-compose.yml

@@ -1,10 +1,24 @@
 ---
 - name: Check current docker-compose version.
-  command: docker-compose --version
+  command: "docker-compose --version"
   register: docker_compose_current_version
   changed_when: false
   failed_when: false
 
+- name: Get latest version from Docker compose
+  block:
+    - name: Get latest version of Docker Compose from Github API
+      uri:
+        url: "{{ docker_compose_version_api_url }}"
+        return_content: yes
+      register: url_content
+      delegate_to: localhost
+
+    - name: Set latest version in docker_compose_version variable
+      set_fact:
+        docker_compose_version: "{{ url_content.json.name }}"
+  when: docker_compose_version is defined and docker_compose_version == 'latest'
+
 - name: Delete existing docker-compose version if it's different.
   file:
     path: "{{ docker_compose_path }}"
@@ -15,6 +29,6 @@
 
 - name: Install Docker Compose (if configured).
   get_url:
-    url: https://github.com/docker/compose/releases/download/{{ docker_compose_version }}/docker-compose-Linux-x86_64
+    url: "{{ docker_compose_download_url }}"
     dest: "{{ docker_compose_path }}"
     mode: 0755