simple-email/node_modules/env-ci/services/jenkins.js

const {head} = require('../lib/git');

// https://wiki.jenkins.io/display/JENKINS/Building+a+software+project

module.exports = {
	detect({env}) {
		return Boolean(env.JENKINS_URL);
	},
	configuration({env, cwd}) {
		const pr = env.ghprbPullId || env.gitlabMergeRequestId || env.CHANGE_ID;
		const isPr = Boolean(pr);
		const localBranch = env.GIT_LOCAL_BRANCH || env.GIT_BRANCH || env.gitlabBranch || env.BRANCH_NAME;

		return {
			name: 'Jenkins',
			service: 'jenkins',
			commit: env.ghprbActualCommit || env.GIT_COMMIT || head({env, cwd}),
			branch: isPr ? env.ghprbTargetBranch || env.gitlabTargetBranch : localBranch,
			build: env.BUILD_NUMBER,
			buildUrl: env.BUILD_URL,
			root: env.WORKSPACE,
			pr,
			isPr,
			prBranch: isPr ? env.ghprbSourceBranch || env.gitlabSourceBranch || localBranch : undefined,
		};
	},
};