ImportValue replaced by !GetAtt

[s-schneider]

it seems that since the last update Fn::ImportValue: is replaced with !GetAtt using rain merge *.yaml. Is that a known issue?

See the attached yaml files
cloudformation.zip

[ericzbeard]

That was on purpose, since if you're merging templates, there's no point in importing a value that's now in the same template. Is this a breaking change for you?

[s-schneider]

In our case it is breaking, because we are first merging the templates and importing that value on deploy from another stack on aws, outside the templates

[ericzbeard]

I'm not sure I understand. Exported names are unique, so how would you have the export in this merged template and also in another one?

[sandymay-dd]

Hi @ericzbeard - We are facing the same issue having upgraded and this is a breaking change for us. We follow the same scenario as @s-schneider, if I've read it correctly.

We export a value from a cloudformation stack (Stack A). The template.yaml that provisions Stack A is not a template that we are using in a rain merge.

We have a collection of smaller templates that we use rain merge to provision Stack B. Stack B imports the export from Stack A.

Therefore when merging the templates, we can no longer import a value that is exported from a different cloudformation stack as rain has converted the `ImportValue! to !GetAtt.

We are using an earlier version of rain to work around this issue.

[sandymay-dd]

Thanks for responding so quickly @ericzbeard 🙇