Flag to print PipelineRun when calling tkn pipeline start

[ghost]

Expected Behavior

I'd like to be able to see the PipelineRun that tkn generates before I decide to actually start it.

Actual Behavior

At the moment tkn pipeline start runs the pipeline but cannot show me what the PipelineRun will be before I start it.

Steps to Reproduce the Problem

1. tkn pipeline start

Additional Info

I'm using tkn for a public release of Tekton Pipelines. Before I commit the PipelineRun that will do the release I'd like to review it (and maybe even copy/paste it somewhere else for other people to see).

[danielhelfand]

So this reminds me a lot of how terraform has a terraform plan command that allows someone to view what is about to happen before an action command is run.

Perhaps something like tkn pipeline start pipeline-name -r resource=pipeline_resource --plan would output a similar description to a tkn pr describe?

[chmouel]

I would imaging something more like --dry-run that would just output a yaml file instead so we can apply it manually after (or use start --dry-run as a generator before versioning)?

[chmouel]

/kind feature

[danielhelfand]

@chmouel I think supporting both an option for a file but also having an option to view it just via output would make sense. But think --dry-run works for sure.

[chmouel]

@danielhelfand Fair enough! let's capture both then :)

[danielhelfand]

/assign