library/roles/drupal-org: Install drush globally.

drupal-org/defaults/main.yml

@@ -32,3 +32,4 @@ drupal_php_prereq:
 
 drupal_install_drush: True
 drupal_drush_version: '{{ drupal_major }}.*'
+drupal_drush_download_url: 'https://s3.amazonaws.com/files.drush.org/drush.phar'

drupal-org/tasks/drush.yml

@@ -1,7 +1,19 @@
 ---
-- name: Install drush
-  become: True
-  become_user: '{{ item.user }}'
-  composer: command=require arguments=drush/drush:{{ drupal_drush_version }} prefer_dist=yes working_dir={{ item.doc_root }}
-  with_items: '{{ phpfpm_pools }}'
+- block:
+    - name: Install a script that downloads and configure a global drush executable
+      template: src=drush-global-setup.sh.j2 dest=/usr/local/bin/drush-global-setup owner=root group=root mode=0700
+      tags: ['drupal', 'drush', 'global_drush' ]
+
+    - name: Setup a global drush executable
+      command: /usr/local/bin/drush-global-setup
+      args:
+        creates: /usr/local/bin/drush
+      tags: ['drupal', 'drush', 'global_drush' ]
+
+    - name: Install drush locally as part of drupal
+      become: True
+      become_user: '{{ item.user }}'
+      composer: command=require arguments=drush/drush:{{ drupal_drush_version }} prefer_dist=yes working_dir={{ item.doc_root }}
+      with_items: '{{ phpfpm_pools }}'
+
   tags: ['drupal', 'drush' ]

drupal-org/templates/drush-global-setup.sh.j2

@@ -0,0 +1,14 @@
+#!/bin/bash
+
+DEST_FILE=/usr/local/bin/drush
+
+php -r "readfile('{{ drupal_drush_download_url }}');" > $DEST_FILE
+
+chmod 755 $DEST_FILE
+
+# The init setup is not useful and it is interactive
+#drush init
+
+exit $?
+
+