Jenkins: pass git commit hash to a downstream job

Question

I have 2 jobs (A and B). Job A points to a git repo at URL-A. Job B points to a different git repo, at URL-B.

Once job A finishes and is stable, it should trigger job B and pass the git commit hash that was used in job A's build.

What is the simplest way to achieve that?

(Job B corresponds to a script checked out from URL-B that has 2 parameters: a git commit hash and a JAR artifact that will be wrapped in a Docker image and pushed to Docker hub)

Answer 1

When you checking out from Job A using the GIT plugin you already have a $GIT_COMMIT parameter that the Plugin exports :

Environment variables

The git plugin sets several environment variables you can use in your scripts:

GIT_COMMIT - SHA of the current

GIT_BRANCH - Name of the remote repository (defaults to origin), followed by name of the branch currently being used, e.g. "origin/master" or "origin/foo"

etc.

Just make sure to pass this parameter to Job B explicitly (predefined parameters, parameter from file, etc).

Answer 2

In Job B, check This project is parameterized. Define a String Parameter, set Name to COMMIT for example. In Job A, set Post-build Actions with Trigger parameterized build on other projects. Project to build is Job B's name, with Trigger when build is as Stable. Add Parameters with Predefined parameters, in which you just put COMMIT=$commit. $commit is usually a paramter defined in Job A. You could add other predefined parameters in Job B and pass a value to all or some of them in Job A.