Fix printing of keys with non-string values

When trying to print a key which has a non-string value
(e.g. bool or int), TypeError exception is raised. This
is caused by the fact, that ensure_type() function accepts
string values, but parsed values are passed (i.e. False
instead of 'False' or 12 instead of '12' and so on).

Change-Id: I10f5e60994bc34288f15af07d2d255ace3755b57
Closes-Bug: #1243263

os_apply_config/apply_config.py

@@ -65,7 +65,7 @@ def print_key(
             else:
                 raise exc.ConfigException(
                     'key %s does not exist in %s' % (key, config_path))
-    value_types.ensure_type(config, type_name)
+    value_types.ensure_type(str(config), type_name)
     print(str(config))
 
 

os_apply_config/tests/test_apply_config.py

@@ -33,6 +33,7 @@
 # config for example tree
 CONFIG = {
     "x": "foo",
+    "y": False,
     "database": {
     "url": "sqlite:///blah"
     }
@@ -90,6 +91,15 @@ def test_print_key(self):
                          self.stdout.read().strip())
         self.assertEqual('', self.logger.output)
 
+    def test_print_non_string_key(self):
+        self.assertEqual(0, apply_config.main(
+            ['os-apply-config.py', '--metadata', self.path, '--key',
+             'y', '--type', 'raw']))
+        self.stdout.seek(0)
+        self.assertEqual(str(CONFIG['y']),
+                         self.stdout.read().strip())
+        self.assertEqual('', self.logger.output)
+
     def test_print_key_missing(self):
         self.assertEqual(1, apply_config.main(
             ['os-apply-config.py', '--metadata', self.path, '--key',