Make easy_install module actually work.

mpdehaan requested in ansible/ansible#795 that globals be removed.
The response was to remove the lines with the word 'global', but not
the actual use of global variables.  Which makes the module break silently.
Updated to use local variables.

library/easy_install

@@ -19,14 +19,9 @@
 # along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
 #
 
-EASY_INSTALL = None
-VIRTUALENV = '/usr/local/bin/virtualenv'
-ENV = None
-
-
-def _find_easy_install():
-    if ENV:
-        return os.path.join(ENV, 'bin', 'easy_install')
+def _find_easy_install(env):
+    if env:
+        return os.path.join(env, 'bin', 'easy_install')
 
     paths = ['/usr/local/bin', '/usr/bin']
 
@@ -36,15 +31,15 @@ def _find_easy_install():
             return e
 
 
-def _ensure_virtualenv():
-    if os.path.exists(os.path.join(ENV, 'bin', 'activate')):
+def _ensure_virtualenv(env, virtualenv):
+    if os.path.exists(os.path.join(env, 'bin', 'activate')):
         return 0, '', ''
     else:
-        return _run('%s %s' % (VIRTUALENV, ENV))
+        return _run('%s %s' % (virtualenv, env))
 
 
-def _is_package_installed(name):
-    cmd = '%s --dry-run %s' % (EASY_INSTALL, name)
+def _is_package_installed(name, easy_install):
+    cmd = '%s --dry-run %s' % (easy_install, name)
     rc, status_stdout, status_stderr = _run(cmd)
     return not ('Reading' in status_stdout or 'Downloading' in status_stdout)
 
@@ -66,15 +61,15 @@ def main():
     module = AnsibleModule(argument_spec=arg_spec)
 
     name = module.params['name']
-    ENV = module.params['virtualenv']
-    EASY_INSTALL = _find_easy_install()
+    env = module.params['virtualenv']
+    easy_install = _find_easy_install(env)
 
     rc = 0
     err = ''
     out = ''
 
-    if ENV:
-        rc_venv, out_venv, err_venv = _ensure_virtualenv()
+    if env:
+        rc_venv, out_venv, err_venv = _ensure_virtualenv(env, '/usr/local/bin/virtualenv')
 
         rc += rc_venv
         out += out_venv
@@ -82,10 +77,10 @@ def main():
 
     cmd = None
     changed = False
-    installed = _is_package_installed(name)
+    installed = _is_package_installed(name, easy_install)
 
     if not installed:
-        cmd = '%s %s' % (EASY_INSTALL, name)
+        cmd = '%s %s' % (easy_install, name)
         rc_pip, out_pip, err_pip = _run(cmd)
 
         rc += rc_pip
@@ -97,8 +92,8 @@ def main():
     if rc != 0:
         module.fail_json(msg=err, cmd=cmd)
 
-    module.exit_json(changed=changed, binary=EASY_INSTALL,
-                     name=name, virtualenv=ENV)
+    module.exit_json(changed=changed, binary=easy_install,
+                     name=name, virtualenv=env)
 
 # this is magic, see lib/ansible/module_common.py
 #<<INCLUDE_ANSIBLE_MODULE_COMMON>>