make file envs compatible with fileclient formats

salt/fileserver/__init__.py

@@ -490,6 +490,14 @@ def envs(self, back=None, sources=False):
             return ret
         return list(ret)
 
+    def file_envs(self, load=None):
+        '''
+        Return environments for all backends for requests from fileclient
+        '''
+        if load is None:
+            load = {}
+        return self.envs(**load)
+
     def init(self, back=None):
         '''
         Initialize the backend, only do so if the fs supports an init function

salt/master.py

@@ -963,7 +963,7 @@ def __setup_fileserver(self):
         self._file_list_emptydirs = self.fs_.file_list_emptydirs
         self._dir_list = self.fs_.dir_list
         self._symlink_list = self.fs_.symlink_list
-        self._file_envs = self.fs_.envs
+        self._file_envs = self.fs_.file_envs
 
     def __verify_minion(self, id_, token):
         '''

salt/modules/cp.py

@@ -296,6 +296,19 @@ def get_file(path,
                 gzip)
 
 
+def envs():
+    '''
+    List available environments for fileserver
+
+    CLI Example
+
+    .. code-block:: bash
+
+        salt '*' cp.envs
+    '''
+    return _client().envs()
+
+
 def get_template(path,
                  dest,
                  template='jinja',

tests/integration/modules/test_cp.py

@@ -614,3 +614,6 @@ def test_push(self):
             self.assertTrue(os.path.isfile(tgt_cache_file), 'File was not cached on the master')
         finally:
             os.unlink(tgt_cache_file)
+
+    def test_envs(self):
+        self.assertEqual(self.run_function('cp.envs'), ['base', 'prod'])