it-praktyk/sato

Sato converts CFN into Terraform

Sato

Converts CFN into Terraform. In Go, quickerly.

Install

Download from latest releases https://github.com/JamesWoolfenden/sato/releases/tag/v0.0.9 or:

Compile locally:

git clone https://github.com/JamesWoolfenden/sato
cd sato
go install

Usage

Get yourself some valid cloudformation*

 git clone https://github.com/JamesWoolfenden/aws-cloudformation-templates
 >cd aws-cloudformation-templates/community/codestar/custom-ci-cd-pipeline
 ❯ ls
 README.md    template.yml
 >sato parse -f template.yml
 9:17PM INF Created .sato\variables.tf
 9:17PM INF Created .sato\data.tf
 9:17PM INF Created .sato\aws_codebuild_project.productionbuild.tf
 9:17PM INF Created .sato\aws_codebuild_project.productiondeploy.tf
 9:17PM INF Created .sato\aws_codebuild_project.stagingbuild.tf
 9:17PM INF Created .sato\aws_codebuild_project.stagingdeploy.tf
 9:17PM INF Created .sato\aws_iam_role.codebuildrole.tf
 9:17PM INF Created .sato\aws_codepipeline_pipeline.pipeline.tf
 9:17PM INF Created .sato\aws_iam_role.pipelinerole.tf
 9:17PM INF Created .sato\aws_s3_bucket.pipelines3bucket.tf

That's it (I should make it obvious that its worked). So by default (overidable) the parsed Cloudformation (now Terraform) will be in a .sato sub directory. So let's have a look see:

> ls .sato
aws_codebuild_project.productionbuild.tf  aws_codebuild_project.stagingbuild.tf     aws_codepipeline_pipeline.pipeline.tf     aws_iam_role.pipelinerole.tf              variables.tf
aws_codebuild_project.productiondeploy.tf aws_codebuild_project.stagingdeploy.tf    aws_iam_role.codebuildrole.tf             aws_s3_bucket.pipelines3bucket.tf

So there are some files that could be Terraform.

The Cats Pyjamas

Testing...

>terraform init
...
Terraform has been successfully initialized!
....
>terraform plan
Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the following symbols:
  + create
...
Plan: 12 to add, 0 to change, 0 to destroy.
...

What's missing?

• Lots of Cloudformation support - this is very new project
• variables and resource relationships need work (Current limitation of a library)

Extra credit?

If you use my other tool, Pike you can now apply that and get the policy requirements:

pike scan -d .sato -o json

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "VisualEditor0",
      "Effect": "Allow",
      "Action": [
        "codebuild:BatchGetProjects",
        "codebuild:CreateProject",
        "codebuild:DeleteProject",
        "codebuild:UpdateProject"
      ],
      "Resource": [
        "*"
      ]
    },
    {
      "Sid": "VisualEditor1",
      "Effect": "Allow",
      "Action": [
        "codepipeline:CreatePipeline",
        "codepipeline:DeletePipeline",
        "codepipeline:GetPipeline",
        "codepipeline:ListTagsForResource"
      ],
      "Resource": [
        "*"
      ]
    },
    {
      "Sid": "VisualEditor2",
      "Effect": "Allow",
      "Action": [
        "iam:CreateRole",
        "iam:DeleteRole",
        "iam:DeleteRolePolicy",
        "iam:GetRole",
        "iam:GetRolePolicy",
        "iam:ListAttachedRolePolicies",
        "iam:ListInstanceProfilesForRole",
        "iam:ListRolePolicies",
        "iam:PassRole",
        "iam:PutRolePolicy"
      ],
      "Resource": [
        "*"
      ]
    },
    {
      "Sid": "VisualEditor3",
      "Effect": "Allow",
      "Action": [
        "s3:CreateBucket",
        "s3:DeleteBucket",
        "s3:GetAccelerateConfiguration",
        "s3:GetBucketAcl",
        "s3:GetBucketCORS",
        "s3:GetBucketLogging",
        "s3:GetBucketObjectLockConfiguration",
        "s3:GetBucketPolicy",
        "s3:GetBucketRequestPayment",
        "s3:GetBucketTagging",
        "s3:GetBucketVersioning",
        "s3:GetBucketWebsite",
        "s3:GetEncryptionConfiguration",
        "s3:GetLifecycleConfiguration",
        "s3:GetObject",
        "s3:GetObjectAcl",
        "s3:GetReplicationConfiguration",
        "s3:ListBucket"
      ],
      "Resource": [
        "*"
      ]
    }
  ]
}

Valid Cloudformation

Ditch it all,Ok ok.. but some older samples can play fast and lose with the cloudformation schema and data types. The Go-formation parser is less accommodating, you may need to be stricter on your typing.

• Booleans are true or false and not "false"
• Ints are 1,2,3 not "1", "2", "3"