Merge pull request geerlingguy#16 from alsar/composer-version

Added variable to specify installed composer version

Author: geerlingguy

README.md

@@ -27,6 +27,10 @@ Set this to `true` to update Composer to the latest release every time the playb
 
 The `COMPOSER_HOME` path and directory ownership; this is the directory where global packages will be installed.
 
+    composer_version: ''
+
+You can install a specific release of Composer, e.g. `composer_version: '1.0.0-alpha11'`. If left empty the latest development version will be installed. Note that `composer_keep_updated` will override this variable, as it will always install the latest development version. 
+
     composer_global_packages: {}
 
 A list of packages to install globally (using `composer global require`). If you want to install any packages globally, add a list item with a dictionary with the `name` of the package and a `release`, e.g. `- { name: phpunit/phpunit, release: "4.7.*" }`. The 'release' is optional, and defaults to `@stable`.

defaults/main.yml

@@ -1,6 +1,7 @@
 ---
 composer_path: /usr/local/bin/composer
 composer_keep_updated: false
+composer_version: ''
 
 # The directory where global packages will be installed.
 composer_home_path: '~/.composer'

tasks/main.yml

@@ -17,7 +17,7 @@
 
 - name: Run Composer installer.
   command: >
-    {{ php_executable }} composer-installer.php
+    {{ php_executable }} composer-installer.php {% if composer_version != '' %} --version={{ composer_version }}{% endif %}
     chdir=/tmp
   when: not composer_bin.stat.exists