Generating multibranch pipeline jobs without adding a Jenkinsfile to each repo

[Robert Munteanu]

Hi,

I am trying to enable pull request build checks to a number of 200+ repositories. Currently I'm generating the Jobs as Maven jobs ( https://builds.apache.org/view/S-Z/view/Sling/ ).

I did a prototype with multibranch pipeline jobs and pull requests work just fine. However, to my understanding we can't have a multibranch pipeline job without a Jenkinsfile in the repository. For 200+ repositories that is a no-go.

The GitHub PR builder plug-in seems unmaintained ( https://wiki.jenkins.io/display/JENKINS/GitHub+pull+request+builder+plugin ) so I am not eager to try it out.

What options to I have to manage pull request building with the Job DSL plugin without needing to touch each project and create a Jenkinsfile?

Thanks,

Robert

[Robert Munteanu]

Oh, and as an additional constraint, I can not get admin credentials on the Github projects, only write.

Robert

[Kristiyan Nikolov]

Hi,

you can use this plugin https://plugins.jenkins.io/pipeline-multibranch-defaults

In order to use it via Job DSL you can do something like this:

String getProjectType() {

  return instance.getDescriptor(

    'PipelineMultiBranchDefaultsProject',

  ).clazz.getCanonicalName()

}

String getBranchFactory() {

  return instance.getDescriptor(

   'PipelineBranchDefaultsProjectFactory',

  ).clazz.getCanonicalName()

}

multibranchPipelineJob('my-pipeline') {
  configure { project ->
    project.name = getProjectType()
    project / factory(class: "${getBranchFactory()}")
  }
}

Hope this is helpful for you

[Matt Sheehan]

You can also do something like this:

(Uses http://github-api.kohsuke.org/)

GitHub gitHub = new GitHubBuilder()

    .withOAuthToken('token', 'user')

    .build()

String repoName = 'repo'

gitHub.getRepository(repoName).getPullRequests(GHIssueState.OPEN).each { GHPullRequest pr ->

    String branchName = pr.head.ref

    job("$repoName-$branchName") {

        scm {

            git {

                remote {

                    github "$pr.repository.ownerName/$pr.repository.name"

                }

                branch branchName

            }

        }

        steps {

            // do some work

        }

    }

}

[Robert Munteanu]

Hi Kristiyan,

On Tue, Nov 7, 2017 at 10:04 PM, Kristiyan Nikolov <knik...@gmail.com> wrote:
> you can use this plugin
> https://plugins.jenkins.io/pipeline-multibranch-defaults

This seems quite cool, thanks! Is it possible to use it without
defining a global Jenkins config file? I don't have admin access to
the Jenkins instance.

Thanks,

Robert

[Robert Munteanu]

Hi Matt,

On Wed, Nov 8, 2017 at 10:26 PM, Matt Sheehan <mr.sh...@gmail.com> wrote:
> gitHub.getRepository(repoName).getPullRequests(GHIssueState.OPEN).each {
> GHPullRequest pr ->
> String branchName = pr.head.ref
> job("$repoName-$branchName") {

That creates a job per pull request, right? Seems a bit heavy to me, I
would prefer not to expand the number of jobs even more. Also, how are
jobs deleted in this scenario?

Thanks,

Robert