file.managed: templating contents, not just files

salt/modules/file.py

@@ -3324,6 +3324,61 @@ def source_list(source, source_hash, saltenv):
         return source, source_hash
 
 
+def apply_template_on_contents(
+        contents,
+        template,
+        context,
+        defaults,
+        saltenv):
+    '''
+    Return the contents after applying the templating engine
+
+    contents
+        template string
+
+    template
+        template format
+
+    context
+        Overrides default context variables passed to the template.
+
+    defaults
+        Default context passed to the template.
+
+    CLI Example:
+
+    .. code-block:: bash
+
+        salt '*' file.apply_template_on_contents \\
+            contents='This is a {{ template }} string.' \\
+            template=jinja \\
+            "context={}" "defaults={'template': 'cool'}" \\
+            saltenv=base
+    '''
+    if template in salt.utils.templates.TEMPLATE_REGISTRY:
+        context_dict = defaults if defaults else {}
+        if context:
+            context_dict.update(context)
+        # Apply templating
+        contents = salt.utils.templates.TEMPLATE_REGISTRY[template](
+            contents,
+            from_str=True,
+            to_str=True,
+            context=context_dict,
+            saltenv=saltenv,
+            grains=__grains__,
+            pillar=__pillar__,
+            salt=__salt__,
+            opts=__opts__)['data'].encode('utf-8')
+    else:
+        ret = {}
+        ret['result'] = False
+        ret['comment'] = ('Specified template format {0} is not supported'
+                          ).format(template)
+        return ret
+    return contents
+
+
 def get_managed(
         name,
         template,

salt/states/file.py

@@ -1477,6 +1477,23 @@ def managed(name,
             contents = os.linesep.join(validated_contents)
             if contents_newline and not contents.endswith(os.linesep):
                 contents += os.linesep
+        if template:
+            contents = __salt__['file.apply_template_on_contents'](
+                contents,
+                template=template,
+                context=context,
+                defaults=defaults,
+                saltenv=__env__)
+            if not isinstance(contents, six.string_types):
+                if 'result' in contents:
+                    ret['result'] = contents['result']
+                else:
+                    ret['result'] = False
+                if 'comment' in contents:
+                    ret['comment'] = contents['comment']
+                else:
+                    ret['comment'] = 'Error while applying template on contents'
+                return ret
 
     # Make sure that leading zeros stripped by YAML loader are added back
     mode = __salt__['config.manage_mode'](mode)