For a resource with Modify
as the action, the ResourceChange
structure describes the changes AWS CloudFormation will make to that resource.
The identity of the entity that triggered this change. This entity is a member of the group that is specified by the ChangeSource
field. For example, if you modified the value of the KeyPairName
parameter, the CausingEntity
is the name of the parameter (KeyPairName
).
If the ChangeSource
value is DirectModification
, no value is given for CausingEntity
.
The group to which the CausingEntity
value belongs. There are five entity groups:
-
ResourceReference
entities are Ref
intrinsic functions that refer to resources in the template, such as { "Ref" : "MyEC2InstanceResource" }
.
-
ParameterReference
entities are Ref
intrinsic functions that get template parameter values, such as { "Ref" : "MyPasswordParameter" }
.
-
ResourceAttribute
entities are Fn::GetAtt
intrinsic functions that get resource attribute values, such as { "Fn::GetAtt" : [ "MyEC2InstanceResource", "PublicDnsName" ] }
.
-
DirectModification
entities are changes that are made directly to the template.
-
Automatic
entities are AWS::CloudFormation::Stack
resource types, which are also known as nested stacks. If you made no changes to the AWS::CloudFormation::Stack
resource, AWS CloudFormation sets the ChangeSource
to Automatic
because the nested stack's template might have changed. Changes to a nested stack's template aren't visible to AWS CloudFormation until you run an update on the parent stack.
Indicates whether AWS CloudFormation can determine the target value, and whether the target value will change before you execute a change set.
For Static
evaluations, AWS CloudFormation can determine that the target value will change, and its value. For example, if you directly modify the InstanceType
property of an EC2 instance, AWS CloudFormation knows that this property value will change, and its value, so this is a Static
evaluation.
For Dynamic
evaluations, cannot determine the target value because it depends on the result of an intrinsic function, such as a Ref
or Fn::GetAtt
intrinsic function, when the stack is updated. For example, if your template includes a reference to a resource that is conditionally recreated, the value of the reference (the physical ID of the resource) might change, depending on if the resource is recreated. If the resource is recreated, it will have a new physical ID, so all references to that resource will also be updated.
A ResourceTargetDefinition
structure that describes the field that AWS CloudFormation will change and whether the resource will be recreated.
Returns the "default value" for a type. Read more
This method tests for self
and other
values to be equal, and is used by ==
. Read more
This method tests for !=
.
Performs copy-assignment from source
. Read more
Formats the value using the given formatter. Read more
Creates owned data from borrowed data, usually by cloning. Read more
🔬 This is a nightly-only experimental API. (toowned_clone_into
)
recently added
Uses borrowed data to replace owned data, usually by cloning. Read more
🔬 This is a nightly-only experimental API. (try_from
)
The type returned in the event of a conversion error.
🔬 This is a nightly-only experimental API. (try_from
)
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more
🔬 This is a nightly-only experimental API. (try_from
)
The type returned in the event of a conversion error.
🔬 This is a nightly-only experimental API. (try_from
)
🔬 This is a nightly-only experimental API. (get_type_id
)
this method will likely be replaced by an associated static