Add support for start/end_string arguments

In case template contains some Jinja content that we don't want to
resolve, there're not much options due to the bug, that ignores
{% raw %} tags. The other way to work it around is to override tags that
Jinja will use to detect the content it needs to render. This way
content that should be renderred can be placed in the same template
with the one that needs to stay intact.

Change-Id: I4d28f5ab03858f5555f5e9e555da1dddc0f2b016
Related-Bug: #1649381

plugins/action/config_template.py

@@ -737,6 +737,10 @@ class ActionModule(ActionBase):
         remote_src = self._task.args.get('remote_src', False)
 
         yml_multilines = self._task.args.get('yml_multilines', False)
+        block_end_string = self._task.args.get('block_end_string', '%}')
+        block_start_string = self._task.args.get('block_start_string', '{%')
+        variable_end_string = self._task.args.get('variable_end_string', '}}')
+        variable_start_string = self._task.args.get('variable_start_string', '{{')
 
         return True, dict(
             source=source,
@@ -748,7 +752,11 @@ class ActionModule(ActionBase):
             ignore_none_type=ignore_none_type,
             default_section=default_section,
             yml_multilines=yml_multilines,
-            remote_src=remote_src
+            remote_src=remote_src,
+            block_end_string=block_end_string,
+            block_start_string=block_start_string,
+            variable_end_string=variable_end_string,
+            variable_start_string=variable_start_string
         )
 
     def resultant_ini_as_dict(self, resultant_dict, return_dict=None):
@@ -766,14 +774,22 @@ class ActionModule(ActionBase):
 
         return return_dict
 
-    def _check_templar(self, data):
+    def _check_templar(self, data, extra):
         if boolean(self._task.args.get('render_template', True)):
-            return self._templar.template(
-                data,
-                preserve_trailing_newlines=True,
-                escape_backslashes=False,
-                convert_data=False
-            )
+            templar = self._templar
+            with templar.set_temporary_context(
+                variable_start_string=extra['variable_start_string'],
+                variable_end_string=extra['variable_end_string'],
+                block_start_string=extra['block_start_string'],
+                block_end_string=extra['block_end_string'],
+                searchpath=extra['searchpath']
+            ):
+                return templar.template(
+                    data,
+                    preserve_trailing_newlines=True,
+                    escape_backslashes=False,
+                    convert_data=False
+                )
         else:
             return data
 
@@ -862,14 +878,12 @@ class ActionModule(ActionBase):
                 template_data_slurpee['content']
             ).decode('utf-8')
 
-        self._templar.environment.loader.searchpath = _vars['searchpath']
-
         if LooseVersion(__ansible_version__) < LooseVersion("2.9"):
             self._templar.set_available_variables(temp_vars)
         else:
             self._templar.available_variables = temp_vars
 
-        resultant = self._check_templar(data=template_data)
+        resultant = self._check_templar(data=template_data, extra=_vars)
 
         if LooseVersion(__ansible_version__) < LooseVersion("2.9"):
             # Access to protected method is unavoidable in Ansible
@@ -898,7 +912,7 @@ class ActionModule(ActionBase):
             if 'content' in slurpee:
                 dest_data = base64.b64decode(
                     slurpee['content']).decode('utf-8')
-                resultant_dest = self._check_templar(data=dest_data)
+                resultant_dest = self._check_templar(data=dest_data, extra=_vars)
                 type_merger = getattr(self,
                                       CONFIG_TYPES.get(_vars['config_type']))
                 _, config_new = type_merger(
@@ -941,7 +955,7 @@ class ActionModule(ActionBase):
 
         # Re-template the resultant object as it may have new data within it
         #  as provided by an override variable.
-        resultant = self._check_templar(data=resultant)
+        resultant = self._check_templar(data=resultant, extra=_vars)
 
         # run the copy module
         new_module_args = self._task.args.copy()
@@ -976,6 +990,10 @@ class ActionModule(ActionBase):
         new_module_args.pop('ignore_none_type', None)
         new_module_args.pop('default_section', None)
         new_module_args.pop('yml_multilines', None)
+        new_module_args.pop('block_end_string', None)
+        new_module_args.pop('block_start_string', None)
+        new_module_args.pop('variable_end_string', None)
+        new_module_args.pop('variable_start_string', None)
 
         # While this is in the copy module we dont want to use it.
         new_module_args.pop('remote_src', None)

releasenotes/notes/start_end_string_support-420acb44b5feeb5c.yaml

@@ -0,0 +1,10 @@
+---
+features:
+  - |
+    Added support for arguments that can be used to avoid templating Jinja
+    content:
+
+      * variable_start_string
+      * variable_end_string
+      * block_start_string
+      * block_end_string

tests/files/test_jinja_variables.yml.expected

@@ -0,0 +1,4 @@
+section1:
+  alfa: '{{ alfa_hotel }}'
+  baz: baz
+  tango: tango

tests/templates/test_jinja_variables.yml

@@ -0,0 +1,5 @@
+---
+
+section1:
+  alfa: "{{ alfa_hotel }}"
+  tango: "tango"

tests/test-yaml.yml

@@ -173,3 +173,28 @@
   assert:
     that:
       - "(test_list_only_replace_file_expected.content | b64decode) == (test_list_only_replace_file.content | b64decode)"
+
+- name: Test template with jinja vars in it
+  config_template:
+    src: "{{ playbook_dir }}/templates/test_jinja_variables.yml"
+    dest: "/tmp/test_jinja_variables.yml"
+    config_overrides: "{{ test_jinja_variables }}"
+    config_type: yaml
+    variable_end_string: "%]"
+    variable_start_string: "[%"
+
+- name: Read test_jinja_variables.yml
+  slurp:
+    src: /tmp/test_jinja_variables.yml
+  register: test_jinja_variables
+
+- debug:
+    msg: "Jinja strings - {{ test_jinja_variables.content | b64decode }}"
+
+- debug:
+    msg: "Jinja strings Expected - {{ test_jinja_variables_expected.content | b64decode }}"
+
+- name: Compare files
+  assert:
+    that:
+      - "(test_jinja_variables_expected.content | b64decode) == (test_jinja_variables.content | b64decode)"

tests/test.yml

@@ -73,6 +73,11 @@
         src: "{{ playbook_dir }}/files/test_list_only_replace.yml.expected"
       register: test_list_only_replace_file_expected
 
+    - name: Read expected test_jinja_variables.yml
+      slurp:
+        src: "{{ playbook_dir }}/files/test_jinja_variables.yml.expected"
+      register: test_jinja_variables_expected
+
     - import_tasks: test-common-tasks.yml
 
   handlers:
@@ -168,6 +173,9 @@
         baz: "hotel"
       section3:
         alfa: "bravo"
+    test_jinja_variables:
+      section1:
+        baz: "baz"
     test_enhanced_comments_ini_overrides:
       DEFAULT:
         default_availability_zone: zone1