[GSOC 2020 PROJECT IDEA] Autobuild without Jenkinsfile

[Jeff Pearce]

This is an idea I've been thinking about for awhile, and I wanted to run it by the list to see if it's feasible. It's also possible someone else has looked into it in the past.

I've noticed that a lot of the projects I work with have a single Jenkinsfile, which they copy from repo to repo. I've been reducing the copy/paste with shared libraries, but I'm wondering if we could make it even easier.

I think it would useful if there was a plugin that could connect into the github branch plugin's scanning for Jenkinsfiles, and autodetect the type of project if there's no Jenkinsfile. From there it could reference some sort of template to build/test (or whatever) and generate a pipeline. This would allow branches to have some sort of build without need for any configuration in the branch. 

Thoughts? I'm happy to write it up if it seems feasible.

Best

Jeff

[Jesse Glick]

> I think it would useful if there was a plugin that could connect into the github branch plugin's scanning for Jenkinsfiles, and autodetect the type of project if there's no Jenkinsfile. From there it could reference some sort of template to build/test (or whatever) and generate a pipeline. This would allow branches to have some sort of build without need for any configuration in the branch.

https://docs.cloudbees.com/docs/admin-resources/latest/pipelines-user-guide/pipeline-as-code#pipeline-custom-factories
https://github.com/jenkinsci/pipeline-multibranch-defaults-plugin/blob/master/README.md

[Tomas Bjerre]

I prefer setting up a webhook from the Git service to Jenkins. And in Jenkins I recognize type. Type of repo in combination with the webhook content tells me what should be done. Zero code duplication. I wrote about it here:

   https://jenkins.io/blog/2019/12/14/generic-webhook-trigger-plugin/

[Jeff]

Thanks for the pointers - I suspected this wasn't a novel idea. I'll look at those plugins.

Jeff

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[Aytunc Beken]

 Hey,

You can also check this plugin, https://plugins.jenkins.io/remote-file/. Idea is to have centralized Jenkins file for all multibranch projects. May be it can be helpful.