Label verifier

This plugin allows system administrators to programmatically verify the label assignment correctness on agents. It is useful to prevent a human error in label assignment when you have a larger number or self-organizing agents and generally as a means to make sure your Jenkins agent labels are correct.

Go to the label configuration page of the label whose assignment you want to validate. For example, http://yourserver/jenkins/label/foo/configure. You can associate "label verifies" through this UI, as follows:

The specified script is executed every time an agent with this label comes online. If the script returns a non-zero exit code, the label assignment is considered illegal and Jenkins will mark the agent as offline to prevent it from being used for a build.

The configuration as code plugin can define the label verifiers.

A label verifier to confirm that command line git 2.25 is installed on the agent can be configured like this:

jenkins:
  labelAtoms:
  - name: "git-2.25"
    properties:
    - ? ''
      : verifiers:
        - shellScriptVerifier:
            script: "git --version 2>&1 | grep -F 2.25"

See GitHub Releases