Parameterizing "region_kms_key_ids"

[Alex Gottschalk]

I have a packer recipe that uses var files to fill in account-specific parameters at various parts of the build process.  This allows us to use the same build across multiple accounts from the same source code repo.

I was very happy to discover the "region_kms_key_ids" parameter, as this will remove an in-house process for distributing the packer-built AMI across the regions we utilize.  I would like our var files to look something like this:

{

  "somevar": "someval",

  "kms_key_ids_by_region": {

    "us-east-1": "keyid",

    [...]

   }

}

However I have run into a snag, with the issue https://github.com/hashicorp/packer/issues/2441 and the error "Error reading variables in 'test.json': json: cannot unmarshal object into Go value of type string"  It looks like putting maps into a variable file is not a supported operation.  My questions are, is there any timeline for fixing this?  Is there a recommended workaround?  Having a separate manifest per account is a pretty bad DRY violation.

Thanks!

--Alex

[Rickard von Essen]

Variables are string -> string key/value pairs. You can't use objects (maps). See https://packer.io/docs/templates/user-variables.html

In your case the only solution is to use on pair per region, ie:

"variables": {

  "kms_key_eu-west-1": "",

  "kms_key_eu-north-q": ""

}

etc

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