When registering dependencies for datasources and locals, we now use
refString.
This allows for the functions that detect dependencies to not only be
able to register the same types as dependencies, but instead generalises
it to any type that refString supports, so data, local and var.
This can then be leveraged for orchestrating evaluation of those
components in a non-phased way (i.e. with a DAG for dependency
management).
The `Name` function is used by the DAG library to determine which vertex
is associated to a component, so the `Name` attribute/function needs to
replicate the combination of type and name, so the vertex can be
accurately fetched from the graph.
* Updating the license from MPL to Business Source License
Going forward, this project will be licensed under the Business Source License v1.1. Please see our blog post for more details at https://hashi.co/bsl-blog, FAQ at https://hashi.co/license-faq, and details of the license at www.hashicorp.com/bsl.
* Update copyright file headers to BUSL-1.1
---------
Co-authored-by: hashicorp-copywrite[bot] <110428419+hashicorp-copywrite[bot]@users.noreply.github.com>
create a null data source for testing. We can choose to document if we want to, but it's a convenience for us
add a test to catch cyclic datasource dependency, update tests to include out of order data sources, and update the code to clean up the returned diagnostics generated from the recursive evaluation
PR review comments
* used components that don't have a required_plugin block will make Packer 'implicitly' require those. These components are manually selected and commented for now.
* add tests
* docs
