Add initial change set support

cloudbender/__init__.py

@@ -2,7 +2,7 @@ import logging
 
 __author__ = 'Stefan Reimer'
 __email__ = 'stefan@zero-downtimet.net'
-__version__ = '1.1.0'
+__version__ = '1.1.1'
 
 
 # Set up logging to ``/dev/null`` like a library is supposed to.

cloudbender/cli.py

@@ -46,12 +46,25 @@ def render(ctx, stack_name, multi):
 @click.option("--multi", is_flag=True, help="Allow more than one stack to match")
 @click.pass_context
 def validate(ctx, stack_name, multi):
+    """ Validates already rendered templates using cfn-lint """
     stacks = _find_stacks(ctx, stack_name, multi)
 
     for s in stacks:
         s.validate()
 
 
+@click.command()
+@click.argument("stack_name")
+@click.argument("change_set_name")
+@click.pass_context
+def create_change_set(ctx, stack_name, change_set_name):
+    """ Creates a change set for an existing stack """
+    stacks = _find_stacks(ctx, stack_name)
+
+    for s in stacks:
+        s.create_change_set(change_set_name)
+
+
 @click.command()
 @click.argument("stack_name")
 @click.option("--multi", is_flag=True, help="Allow more than one stack to match")
@@ -143,7 +156,7 @@ def sort_stacks(ctx, stacks):
     assert not data, "A cyclic dependency exists amongst %r" % data
 
 
-def _find_stacks(ctx, stack_name,multi):
+def _find_stacks(ctx, stack_name,multi=False):
     cb = ctx.obj['cb']
 
     # ALL acts ass config and multi=True
@@ -169,6 +182,7 @@ cli.add_command(validate)
 cli.add_command(provision)
 cli.add_command(delete)
 cli.add_command(clean)
+cli.add_command(create_change_set)
 
 if __name__ == '__main__':
     cli(obj={})

cloudbender/stack.py

@@ -366,6 +366,28 @@ class Stack(object):
         return self._wait_for_completion()
 
 
+    def create_change_set(self, change_set_name):
+        """ Creates a Change Set with the name ``change_set_name``.  """
+
+        # Prepare parameters
+        self.resolve_parameters()
+        self.write_parameter_file()
+
+        if not self.cfn_template:
+            self.read_template_file()
+
+        logger.info('Creating change set {0} for stack {1}'.format(change_set_name, self.stackname))
+        response = self.connection_manager.call('cloudformation', 'create_change_set',
+                       {'StackName':self.stackname,
+                       'ChangeSetName': change_set_name,
+                       'TemplateBody':self.cfn_template,
+                       'Parameters':self.cfn_parameters,
+                       'Tags':[ {"Key": str(k), "Value": str(v)} for k, v in self.tags.items() ],
+                       'Capabilities':['CAPABILITY_IAM', 'CAPABILITY_NAMED_IAM']},
+                        profile=self.profile, region=self.region)
+        return self._wait_for_completion()
+
+
     def describe(self):
         """
         Returns the a description of the stack.