Is is possible to use !Sub to concatinate one environment variable with another in SAM CLI templates for AWS?

user_2052732 0
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I have a group of lambdas that I have most of the items within parameter store parameters. I have the sub trees seperated by envrionment.

Example

/prod/type/app1/parameter1
/prod/type/app1/parameter2
/prod/type/app2/parameter1
/dev/type/app1/parameter1
/dev/type/app1/parameter2
/dev/type/app2/parameter1

I would like to reference the path within the environment variables of a template.yml for a lambda function using SAM CLI.

I am trying to use !Sub but I am not having the results that I was hoping for.

Example:

Environment:
  Variables:
    ENV: "DEV"
    SSM_PS_APP1_PATH: !Sub "/${ENV}/type/app1/"

The Results I get are:

/ENV/type/app1

My question is it possible to reference another variable within the Environment Variable Declaration using !Sub?

amazon-cloudformation amazon-web-services command-line-interface
1 Answers

Sadly, its not possible. You would have to make ENV CloudFormation variable as well:

Parameters:
  ENV:
   Default: DEV

and then:

Environment:
  Variables:
    ENV: !Ref ENV
    SSM_PS_APP1_PATH: !Sub "/${ENV}/type/app1/"
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