What commits are pulled by Jenkins in the build?

Jenkins has information about commits included in a particular build. I know this because Jenkins displays this (see the screenshot below).

How can I pull the information about commits included in the build during the CI execution?

This information is required to check what folders have files modified and, as a result, to determine what actions Jenkins should execute.

P.S. To achieve this in CI jobs for PRs, I use git command:

git rev-parse github/master

It returns the last commit made in master before current branch was branched off (to make it work I add 'github' remote). Obviously, it can't work in the 'master' branch itself. So I'm thinking, maybe Jenkins has some built-in information that I can use? Or some Jenkins plugins can help?

Apparently, there is a bunch of links, though I could not find any until I figured the keyword to google for it.

1st of all, there is a DevOps version of StackOverflow: https://devops.stackexchange.com/ It might have more people active that can help with Jenkins related questions

2nd, the idea is to use jenkins variable currentBuild and further iterated through:

• currentBuild.previousBuild
• build.changeSets
• items in the build
• commit hashes are in the item.commitId

Links that helped me to figure out the solution:

• What commits are pulled by Jenkins in the build?
• https://devops.stackexchange.com/questions/2310/get-all-change-logs-of-since-last-successful-build-in-jenkins-pipeline?newreg=52d68c7ced584340988071cc72440ca1
• https://blog.csdn.net/liurizhou/article/details/88236397
• NotSerializableException thrown when accessing currentBuild.changeSets in Jenkins pipeline
• https://gitter.im/jenkinsci/jenkins - public chat with jenkins community, not super active, but still helpful.

IMPORTANT NOTES:

1. Because of how Groovy works in Jenkins you need to put this logic into a separate function and add "@NonCPS" attribute to it
2. All variables inside need to be prefixed by 'def' (even though my prettier told me this is not required), without this you will have "java.io.NotSerializableException: hudson.plugins.git.GitChangeSetList" errors.

Hope this will help someone as well!