Add support for archlinux

Signed-off-by: Knut Ahlers <knut@ahlers.me>

README.md

@@ -4,6 +4,7 @@ This role installs latest docker-compose on a host and start it as a systemd dae
 
 ## Requirements
 
+- Archlinux
 - Debian >= 8 (jessie)
 - Ubuntu >= 16.04 (xenial)
 - Docker

meta/main.yml

@@ -18,6 +18,8 @@ galaxy_info:
     versions:
       - jessie
       - stretch
+  - name: Archlinux
+    versions: [all]
 
   categories:
     #- cloud

tasks/Archlinux.yml

@@ -0,0 +1,11 @@
+---
+
+- name: Install or update docker-compose
+  pacman:
+    name: docker-compose
+    state: latest
+  register: docker_compose
+
+- set_fact: docker_compose_binary_path="/usr/bin/docker-compose"
+
+...

tasks/Debian.yml

@@ -0,0 +1,5 @@
+---
+
+- include: Ubuntu.yml
+
+...

tasks/Ubuntu.yml

@@ -0,0 +1,17 @@
+---
+
+- name: Ensure pip to be available
+  apt:
+    name: python-pip
+    cache_valid_time: 86400
+
+- name: Install or update docker-compose
+  pip:
+    name: docker-compose
+    executable: pip
+    state: latest
+  register: docker_compose
+
+- set_fact: docker_compose_binary_path="/usr/local/bin/docker-compose"
+
+...

tasks/main.yml

@@ -2,17 +2,8 @@
 
 # Install docker-compose
 
-- name: Ensure pip to be available
-  apt:
-    name: python-pip
-    cache_valid_time: 86400
-
-- name: Install or update docker-compose
-  pip:
-    name: docker-compose
-    executable: pip
-    state: latest
-  register: docker_compose
+- name: "Loading distribution specific instructions for {{ ansible_distribution }}"
+  include: "{{ ansible_distribution }}.yml"
 
 # Configure docker-compose
 
@@ -51,13 +42,13 @@
       Type=oneshot
       RemainAfterExit=yes
 
-      ExecStartPre=-/usr/local/bin/docker-compose pull --quiet --ignore-pull-failures
-      ExecStart=/usr/local/bin/docker-compose up -d --remove-orphans
+      ExecStartPre=-{{ docker_compose_binary_path }} pull --quiet --ignore-pull-failures
+      ExecStart={{ docker_compose_binary_path }} up -d --remove-orphans
 
-      ExecStop=/usr/local/bin/docker-compose {{ docker_compose_stop_action }}
+      ExecStop={{ docker_compose_binary_path }} {{ docker_compose_stop_action }}
 
-      ExecReload=/usr/local/bin/docker-compose pull --quiet --ignore-pull-failures
-      ExecReload=/usr/local/bin/docker-compose up -d --remove-orphans
+      ExecReload={{ docker_compose_binary_path }} pull --quiet --ignore-pull-failures
+      ExecReload={{ docker_compose_binary_path }} up -d --remove-orphans
 
       [Install]
       WantedBy=docker.service