import jenkins.model.Jenkins
import ru.yandex.qatools.allure.jenkins.tools.AllureCommandlineInstallation
import ru.yandex.qatools.allure.jenkins.tools.AllureCommandlineInstaller
import hudson.tools.InstallSourceProperty

def jenkins = Jenkins.instance
def desc = jenkins.getDescriptorByType(AllureCommandlineInstallation.DescriptorImpl)
def existing = desc.getInstallations()

def alreadyConfigured = existing.any { it.name == "allure" }
if (!alreadyConfigured) {
    def installer = new AllureCommandlineInstaller("2.29.0")
    def prop = new InstallSourceProperty([installer])
    def installation = new AllureCommandlineInstallation("allure", "", [prop])
    desc.setInstallations(installation)
    desc.save()
}