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Add support for Fn::Transform

See original GitHub issue

cfn-lint version: 0.7.4

Description of issue.

cfn-lint does not properly evaluate Fn::Transform.

Example:

Resources:
  
  'Fn::Transform':
    Name: 'AWS::Include'
    Parameters:
      Location: "s3://mybucket/mySnippet.yaml"

  'Fn::Transform':
    Name: 'AWS::Include'
    Parameters:
      Location: "s3://mybucket/mySecondSnippet.yaml"

Returns:

Illegal cfn - missing Type: id: Fn::Transform

Additionally, multiple Fn::Transforms produce this error:

Duplicate resource found “Fn::Transform” (line 299)

The template used which generated these errors passed aws cloudformation validate-template without error, so it is valid CFN syntax.

Issue Analytics

State:
Created 5 years ago
Reactions:30
Comments:28 (3 by maintainers)

Top GitHub Comments

6reactions

darrenweinercommented, Feb 13, 2022

Would be great to see resolution on this issue. Fundamentally, synthesizing the transform is an intractable problem, ignore it, perhaps with a message if possible so cfn-lint doesn’t have to be disabled.

4reactions

phenecommented, Jan 13, 2021

That’s because you do have duplicates.

- "SubnetIds": [ {"Ref": "SubnetId001", "Ref": "SubnetId002", "Ref": "SubnetId003"} ]
+ "SubnetIds": [ { "Ref": "SubnetId001" }, { "Ref": "SubnetId002" }, { "Ref": "SubnetId003" } ]

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