Finish the installation and check tasks

defaults/main.yml

@@ -1,2 +1,8 @@
 ---
-# defaults file for composer
+composer_apt_packages:
+ - php5-cli
+ - curl
+
+composer_download_url: https://getcomposer.org/composer.phar
+
+composer_download_force: no

meta/main.yml

@@ -4,9 +4,16 @@ galaxy_info:
   license: BSD
   min_ansible_version: 1.2
   platforms:
-  - name: GenericUNIX
+  - name: Ubuntu
     versions:
-    - any
+    - all
+  - name: Debian
+    versions:
+    - all
+  #
+  # Below are all categories currently available. Just as with
+  # the platforms above, uncomment those that apply to your role.
+  #
   categories:
   - packaging
   - system

tasks/main.yml

@@ -1,2 +1,16 @@
 ---
-# tasks file for composer
+- name: Install the required packages
+  apt: name={{ item }} state=present update_cache=yes
+  with_items: composer_apt_packages
+  when: ansible_os_family == "Debian"
+  tags: [packages,composer]
+
+- name: Download composer
+  get_url: url={{ composer_download_url }} dest=/usr/local/bin/composer force={{ composer_download_force }} mode=755
+  tags: [packages,composer]
+
+- name: Check the installation
+  command: composer -V --no-ansi
+  register: composer_result
+  changed_when: "'Composer version' in composer_result.stdout"
+  failed_when: "'Composer version' not in composer_result.stdout"