Source:
public void setUp(Context context, Run<?, ?> build, FilePath workspace, Launcher launcher, TaskListener listener, EnvVars initialEnvironment) throws IOException, InterruptedException { if (credentialsId == null) { throw new AbortException("No credentials defined to setup Kubernetes CLI"); } workspace.mkdirs(); FilePath configFile = workspace.createTempFile(".kube", "config"); Set<String> tempFiles = newHashSet(configFile.getRemote()); context.env("KUBECONFIG", configFile.getRemote()); context.setDisposer(new CleanupDisposer(tempFiles)); StandardCredentials credentials = CredentialsProvider.findCredentialById(credentialsId, StandardCredentials.class, build, Collections.emptyList()); if (credentials == null) { throw new AbortException("No credentials found for id \"" + credentialsId + "\""); } KubernetesAuth auth = AuthenticationTokens.convert(KubernetesAuth.class, credentials); if (auth == null) { throw new AbortException("Unsupported Credentials type " + credentials.getClass().getName()); } try (Writer w = new OutputStreamWriter(configFile.write())) { w.write(auth.buildKubeConfig(new KubernetesAuthConfig(getServerUrl(), getCaCertificate(), getCaCertificate() == null))); } catch (KubernetesAuthException e) { throw new AbortException(e.getMessage()); } ByteArrayOutputStream out = new ByteArrayOutputStream(); ByteArrayOutputStream err = new ByteArrayOutputStream(); String cmd = "kubectl version"; int status = launcher.launch().cmdAsSingleString(cmd).stdout(out).stderr(err).quiet(true).envs("KUBECONFIG="+configFile.getRemote()).join(); if (status != 0) { StringBuilder msgBuilder = new StringBuilder("Failed to run \"").append(cmd).append("\". Returned status code ").append(status).append(".\n"); msgBuilder.append("stdout:\n").append(out).append("\n"); msgBuilder.append("stderr:\n").append(err); throw new AbortException(msgBuilder.toString()); } }

Target:
public void setUp(Context context, Run<?, ?> build, FilePath workspace, Launcher launcher, TaskListener listener, EnvVars initialEnvironment) throws IOException, InterruptedException { if (credentialsId == null) { throw new AbortException("No credentials defined to setup Kubernetes CLI"); } workspace.mkdirs(); FilePath configFile = workspace.createTempFile(".kube", "config"); Set<String> tempFiles = newHashSet(configFile.getRemote()); context.env("KUBECONFIG", configFile.getRemote()); context.setDisposer(new CleanupDisposer(tempFiles)); StandardCredentials credentials = CredentialsProvider.findCredentialById(credentialsId, StandardCredentials.class, build, Collections.emptyList()); if (credentials == null) { throw new AbortException("No credentials found for id \"" + credentialsId + "\""); } KubernetesAuth auth = AuthenticationTokens.convert(KubernetesAuth.class, credentials); if (auth == null) { throw new AbortException("Unsupported Credentials type " + credentials.getClass().getName()); } try (Writer w = new OutputStreamWriter(configFile.write(), StandardCharsets.UTF_8)) { w.write(auth.buildKubeConfig(new KubernetesAuthConfig(getServerUrl(), getCaCertificate(), getCaCertificate() == null))); } catch (KubernetesAuthException e) { throw new AbortException(e.getMessage()); } ByteArrayOutputStream out = new ByteArrayOutputStream(); ByteArrayOutputStream err = new ByteArrayOutputStream(); String cmd = "kubectl version"; int status = launcher.launch().cmdAsSingleString(cmd).stdout(out).stderr(err).quiet(true).envs("KUBECONFIG="+configFile.getRemote()).join(); if (status != 0) { StringBuilder msgBuilder = new StringBuilder("Failed to run \"").append(cmd).append("\". Returned status code ").append(status).append(".\n"); msgBuilder.append("stdout:\n").append(out).append("\n"); msgBuilder.append("stderr:\n").append(err); throw new AbortException(msgBuilder.toString()); } }