github-release.groovy

#!groovy

pipeline {
    agent any
    stages {
        stage ("check") {
            when {
                branch 'master'
            }
            steps {
                withCredentials([usernamePassword(credentialsId: 'scm-account', passwordVariable: 'SCMPASS', usernameVariable: 'SCMUSER')]) {
                    // fetch information about tags
                    sh "git config --add remote.origin.fetch +refs/heads/master:refs/remotes/origin/master"
                    sh "git fetch https://${SCMUSER}:${SCMPASS}@git.contoso.com/ORG/REPO.git"
                    
                    // Use git log to build a list of changes from th elast tag to current master
                    sh """ 
                        lastRelease=\$(git describe --tags --abbrev=0 origin/master)
                        git log --format=format:\"%s (%an)\" \${lastRelease}..origin/master > gitlog
                        if [ -s gitlog ]
                        then
                            echo yes > haschanges
                        else
                            echo no > haschanges
                            echo No release required, No commits found since \$lastRelease
                        fi
                    """
                    script {
                        env.HAS_CHANGES = readFile('haschanges').trim()
                    }
                }
            }
        }

        stage ("release") {
            when {
                environment name: 'HAS_CHANGES', value: 'yes'
            }
            steps {
                withCredentials([usernamePassword(credentialsId: 'scm-account', passwordVariable: 'SCMPASS', usernameVariable: 'SCMUSER')]) {
                    sh "python .jenkins/github-release.py -c -u $SCMUSER -p $SCMPASS -o mrhockeymonkey -r somerepo --description_file gitlog"
                }
            }
        }
    }

    post {
        cleanup {
            deleteDir()
        }
    }
}