Codepipeline cdk v2: Self mutate before synth step

[purnasrivatsa96]

Describe the feature

Right now, i believe self mutate runs (if we set self Mutation to true in new CodePipeline(...) initialization) after synth step. What if i change commands in synth . And i need pipeline to update before it runs( so it can run the latest synth commands).

Use Case

What if i change commands in synth . And i need pipeline to update before it runs( so it can run the latest synth commands).

Proposed Solution

selfMutateFirst? : boolean

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

CDK version used

2

Environment details (OS name and version, etc.)

Deployed to linux

[pahud]

This is an interesting idea. I believe for now it would just run the pipeline once and then self-mutate right? I am not sure if we could make it self-mutate first but I get your ideas here. Please help us prioritize with 👍 and we welcome the PRs.

[purnasrivatsa96]

i faced a situation where i felt it would have been nice if this existed.
I have -

export class ServiceCdkStack extends cdk.Stack {
  constructor(scope: Construct, id: string, props?: cdk.StackProps) {
    super(scope, id, props);

    // Create an S3 bucket to store the dist files


    // Create an IAM role for the CodeBuild project with permissions to access the S3 bucket


    // Attach policy to allow CodeBuild to interact with S3
   

    // Attach policy for sts:GetServiceBearerToken


    const pipeline = new CodePipeline(this, "Pipeline", {
      pipelineName: "ServicePipeline",
      selfMutation: true,
      synth: new ShellStep("Synth", {
        input: CodePipelineSource.gitHub(
          "repoName",
          "main"
        ),
        commands: [
          "cd service",
          "make build-server",
          "echo 'testing in Synth step'",
          "cd ..",
          "cd service-cdk",
          "ls -la",
          "npm ci",
          "npm run build",
          "npx cdk synth",
          "mv cdk.out ../",
        ],
        env: {
          NODE_ENV: "production",
        },
      }),
    });

now i updated

make build-server

to expect NODE_ENV and it will throw error if that is not set.
In pipeline , the synth runs first -

followed by updatePipeline which self mutates( and then adds the env var)

So the synth fails since self mutate(which will update pipeline stack to include env in synth step and allow for make to succeed) has not happened yet.