Add ignore_none_type to config template

It is sometimes useful to tell ConfigTemplateParser to write
out options that are valueless and not suffixed with '=' or ':',
such as when overriding a my.cnf.

This commit adds the 'ignore_none_type' attribute to the config_template
module. If this attribute is set to false, then valueless options will be
written out to the resultant INI file as-is, without the '=' or ':' suffix.

Change-Id: I5c88b2019c01b44193a5d0df9299ecce6de52f01
Partial-Bug: #1693234

action/_v2_config_template.py

@@ -155,9 +155,17 @@ class ConfigTemplateParser(ConfigParser.RawConfigParser):
     key = var3
     key = var2
     """
-    def _write(self, fp, section, item, entry):
+    def __init__(self, *args, **kwargs):
+        self.ignore_none_type = bool(kwargs.pop('ignore_none_type', True))
+        ConfigParser.RawConfigParser.__init__(self, *args, **kwargs)
+
+    def _write(self, fp, section, key, item, entry):
         if section:
-            if (item is not None) or (self._optcre == self.OPTCRE):
+            # If we are not ignoring a none type value, then print out
+            # the option name only if the value type is None.
+            if not self.ignore_none_type and item is None:
+                fp.write(key + '\n')
+            elif (item is not None) or (self._optcre == self.OPTCRE):
                 fp.write(entry)
         else:
             fp.write(entry)
@@ -167,14 +175,14 @@ def _write_check(self, fp, key, value, section=False):
             for item in value:
                 item = str(item).replace('\n', '\n\t')
                 entry = "%s = %s\n" % (key, item)
-                self._write(fp, section, item, entry)
+                self._write(fp, section, key, item, entry)
         else:
             if isinstance(value, list):
                 _value = [str(i.replace('\n', '\n\t')) for i in value]
                 entry = '%s = %s\n' % (key, ','.join(_value))
             else:
                 entry = '%s = %s\n' % (key, str(value).replace('\n', '\n\t'))
-            self._write(fp, section, value, entry)
+            self._write(fp, section, key, value, entry)
 
     def write(self, fp):
         if self._defaults:
@@ -268,7 +276,11 @@ def _read(self, fp, fpname):
 class ActionModule(ActionBase):
     TRANSFERS_FILES = True
 
-    def return_config_overrides_ini(self, config_overrides, resultant, list_extend=True):
+    def return_config_overrides_ini(self,
+                                    config_overrides,
+                                    resultant,
+                                    list_extend=True,
+                                    ignore_none_type=True):
         """Returns string value from a modified config file.
 
         :param config_overrides: ``dict``
@@ -281,7 +293,8 @@ def return_config_overrides_ini(self, config_overrides, resultant, list_extend=T
         try:
             config = ConfigTemplateParser(
                 allow_no_value=True,
-                dict_type=MultiKeyDict
+                dict_type=MultiKeyDict,
+                ignore_none_type=ignore_none_type
             )
             config.optionxform = str
         except Exception:
@@ -344,7 +357,11 @@ def _option_write(config, section, key, value):
         else:
             config.set(str(section), str(key), str(value))
 
-    def return_config_overrides_json(self, config_overrides, resultant, list_extend=True):
+    def return_config_overrides_json(self,
+                                     config_overrides,
+                                     resultant,
+                                     list_extend=True,
+                                     ignore_none_type=True):
         """Returns config json
 
         Its important to note that file ordering will not be preserved as the
@@ -366,7 +383,11 @@ def return_config_overrides_json(self, config_overrides, resultant, list_extend=
             sort_keys=True
         )
 
-    def return_config_overrides_yaml(self, config_overrides, resultant, list_extend=True):
+    def return_config_overrides_yaml(self,
+                                     config_overrides,
+                                     resultant,
+                                     list_extend=True,
+                                     ignore_none_type=True):
         """Return config yaml.
 
         :param config_overrides: ``dict``
@@ -484,13 +505,23 @@ def _load_options_and_status(self, task_vars):
             if user_dest.endswith(os.sep):
                 user_dest = os.path.join(user_dest, os.path.basename(source))
 
+        # Get ignore_none_type
+        # In some situations(i.e. my.cnf files), INI files can have valueless
+        # options that don't have a '=' or ':' suffix. In these cases,
+        # ConfigParser gives these options a "None" value. If ignore_none_type
+        # is set to true, these key/value options will be ignored, if it's set
+        # to false, then ConfigTemplateParser will write out only the option
+        # name with out the '=' or ':' suffix. The default is true.
+        ignore_none_type = self._task.args.get('ignore_none_type', True)
+
         return True, dict(
             source=source,
             dest=user_dest,
             config_overrides=self._task.args.get('config_overrides', dict()),
             config_type=config_type,
             searchpath=searchpath,
-            list_extend=list_extend
+            list_extend=list_extend,
+            ignore_none_type=ignore_none_type
         )
 
     def run(self, tmp=None, task_vars=None):
@@ -563,7 +594,8 @@ def run(self, tmp=None, task_vars=None):
             resultant = type_merger(
                 config_overrides=_vars['config_overrides'],
                 resultant=resultant,
-                list_extend=_vars.get('list_extend', True)
+                list_extend=_vars.get('list_extend', True),
+                ignore_none_type=_vars.get('ignore_none_type', True)
             )
 
         # Re-template the resultant object as it may have new data within it
@@ -595,6 +627,7 @@ def run(self, tmp=None, task_vars=None):
         new_module_args.pop('config_overrides', None)
         new_module_args.pop('config_type', None)
         new_module_args.pop('list_extend', None)
+        new_module_args.pop('ignore_none_type', None)
         # Content from config_template is converted to src
         new_module_args.pop('content', None)
 

library/config_template

@@ -49,6 +49,16 @@ options:
     choices:
       - True
       - False
+  ignore_none_type:
+    description:
+      - Can be true or false. If ignore_none_type is set to true, then
+        valueless INI options will not be written out to the resultant file.
+        If it's set to false, then config_template will write out only
+        the option name without the '=' or ':' suffix. The default is true.
+    choices:
+      - True
+      - False
+
 author: Kevin Carter
 """
 

releasenotes/notes/config-template-ignore-none-type-9387c236853f061b.yaml

@@ -0,0 +1,9 @@
+---
+features:
+  - |
+    The config_template template module now supports writing out valueless
+    INI options without suffixing them with '=' or ':'. This is done via the
+    'ignore_none_type' attribute. If ignore_none_type is set to true, these
+    key/value entries will be ignored, if it's set to false, then
+    ConfigTemplateParser will write out only the option name without the
+    '=' or ':' suffix. The default is true.

tests/templates/test_ignore_none_type.ini

@@ -0,0 +1,8 @@
+[alfa]
+bravo = charlie
+delta = echo
+[foxtrot]
+golf = hotel
+india
+juliett kilo
+lima = mike

tests/test-config_template.yml

@@ -136,6 +136,26 @@
         that:
           - "(content_no_overrides_file.content | b64decode | from_json) == (content_no_overrides_file_expected.content | b64decode | from_json)"
 
+    # Test the ignore_none_type attribute when set to False
+    - name: Template test with ignore_none_type set to false
+      config_template:
+        src: "{{ playbook_dir }}/templates/test_ignore_none_type.ini"
+        dest: "/tmp/test_ignore_none_type.ini"
+        config_overrides: "{{ test_config_ini_overrides }}"
+        config_type: "ini"
+        ignore_none_type: False
+    - name: Read test_ignore_none_type.ini
+      slurp:
+        src: /tmp/test_ignore_none_type.ini
+      register: test_ignore_none_type
+    - debug:
+        msg: "test_ignore_none_type.ini - {{ test_ignore_none_type.content | b64decode }}"
+    - name: Validate output has valueless options printed out
+      assert:
+        that:
+          - "{{ test_ignore_none_type.content | b64decode | search('(?m)^india$') }}"
+          - "{{ test_ignore_none_type.content | b64decode | search('(?m)^juliett kilo$') }}"
+
   vars:
     test_config_ini_overrides:
       DEFAULT: