In a multibranch project, Jenkins allows you to select a run of a pipeline and "replay it" as the same commit. A user can also view and optionally edit the Jenkinsfile, so when it "runs" it runs with the modified Jenkinsfile. This is very useful for debugging a Jenkinsfile, or just retrying a specific commit to see if the failure is related to a commit, or environmental.

We need an api that allows it to take the Jenkinsfile script to execute, but also provide the state of the Jenkinsfile as it was.

In scope:

• Retry pipeline with latest HEAD of scm (no change of Jenkinsfile)
• Retry of freestyle job with latest HEAD of scm
• Replay of multibranch pipeline with same Jenkinsfile content for a specific commit specified
• Replay of multibranch pipeline with modified Jenkinsfile content for a specific commit specified

Out of scope:

• Replay of freestyle for a specific commit
• Replay of freestyle with modified content

Required for parity with Jenkins.