Added environment variable provider

Author: rennokki

config/k8s.php

@@ -96,6 +96,26 @@
             'host' => env('KUBE_HOST', 'https://kubernetes.default.svc.cluster.local'),
         ],
 
+        /*
+        |--------------------------------------------------------------------------
+        | Environment Variable Driver
+        |--------------------------------------------------------------------------
+        |
+        | The environment variable driver leverages your current (possibly set)
+        | KUBECONFIG environment variable. The variable contains a list of paths
+        | towards multiple kubeconfig files that will be read, merged and based
+        | on the selected context from the configuration, it will connect
+        | to the cluster, just like the "kubeconfig" driver.
+        |
+        | Read more: https://kubernetes.io/docs/tasks/access-application-cluster/configure-access-multiple-clusters/
+        |
+        */
+
+        'environment' => [
+            'driver' => 'environment',
+            'context' => env('KUBECONFIG_CONTEXT', 'minikube'),
+        ],
+
     ],
 
 ];

src/KubernetesCluster.php

@@ -55,6 +55,7 @@ protected function loadFromConfig(array $config)
             case 'http': $this->configureWithHttpAuth($config); break;
             case 'token': $this->configureWithToken($config); break;
             case 'cluster': $this->configureInCluster($config); break;
+            case 'variable': $this->configureWithKubeConfigVariable($config); break;
             default: break;
         }
     }
@@ -144,6 +145,18 @@ protected function configureInCluster(array $config)
         $this->cluster = PhpK8sCluster::inClusterConfiguration();
     }
 
+    /**
+     * Configure the cluster using the
+     * KUBECONFIG environment variable.
+     *
+     * @param  array  $config
+     * @return void
+     */
+    protected function configureWithKubeConfigVariable(array $config)
+    {
+        $this->cluster = PhpK8sCluster::fromKubeConfigVariable($config['context']);
+    }
+
     /**
      * Get the initialized cluster.
      *

tests/ConfigurationTest.php

@@ -130,4 +130,29 @@ public function test_in_cluster_config()
         $this->assertEquals('/var/run/secrets/kubernetes.io/serviceaccount/ca.crt', $caPath);
         $this->assertEquals('some-namespace', K8sResource::$defaultNamespace);
     }
+
+    /**
+     * @dataProvider environmentVariableContextProvider
+     */
+    public function test_from_environment_variable(string $context = null, string $expectedDomain)
+    {
+        $_SERVER['KUBECONFIG'] = __DIR__.'/cluster/kubeconfig.yaml::'.__DIR__.'/cluster/kubeconfig-2.yaml';
+
+        $this->app['config']->set('k8s.default', 'variable');
+        $this->app['config']->set('k8s.connections.variable', [
+            'driver' => 'variable',
+            'context' => $context,
+        ]);
+
+        $cluster = LaravelK8sFacade::connection('variable')->getCluster();
+
+        $this->assertSame("https://{$expectedDomain}:8443/?", $cluster->getCallableUrl('/', []));
+    }
+
+    public function environmentVariableContextProvider(): iterable
+    {
+        yield [null, 'minikube'];
+        yield ['minikube-2', 'minikube-2'];
+        yield ['minikube-3', 'minikube-3'];
+    }
 }

tests/TestCase.php

@@ -6,6 +6,16 @@
 
 abstract class TestCase extends Orchestra
 {
+    /**
+     * {@inheritDoc}
+     */
+    public function tearDown(): void
+    {
+        parent::tearDown();
+
+        unset($_SERVER['KUBECONFIG']);
+    }
+
     /**
      * {@inheritdoc}
      */

tests/cluster/kubeconfig-2.yaml

@@ -0,0 +1,10 @@
+clusters:
+  - cluster:
+      certificate-authority-data: c29tZS1jYQo= # "some-ca"
+      server: https://minikube-3:8443
+    name: minikube-3
+contexts:
+  - context:
+      cluster: minikube-3
+      user: minikube
+    name: minikube-3