How do I get the "changes" (commit message) that triggered a Jenkins build?

Question

I can go to

http://myjenkins:8080/job/Project/42/changes

and see the commit message that triggered a particular Jenkins build.

However, I want to grab this via REST API or something. I'm not having any luck in search. Is there an easy way to do this?

Answer 1

Here's an example of how to get the comment, affected files and commit ID from a Jenkins build:

curl http://jenkins/job/JOB_NAME/BUILD_NUMBER/api/json?pretty=true&tree=changeSet[items[comment,affectedPaths,commitId]]

Here's an explanation of how the tree and depth parameters work.