change GetPodLogs to return io.Reader instead of string

well, more specifically returns an io.ReadCloser (giving the consumer more capabilities)
Signed-off-by: Jeff Knurek <j.knurek@travelaudience.com>

pkg/kube/client.go

@@ -31,7 +31,7 @@ import (
 
 	"k8s.io/apimachinery/pkg/api/meta"
 
-	"github.com/evanphx/json-patch"
+	jsonpatch "github.com/evanphx/json-patch"
 	appsv1 "k8s.io/api/apps/v1"
 	appsv1beta1 "k8s.io/api/apps/v1beta1"
 	appsv1beta2 "k8s.io/api/apps/v1beta2"
@@ -948,24 +948,17 @@ func (c *Client) watchPodUntilComplete(timeout time.Duration, info *resource.Inf
 }
 
 // GetPodLogs takes pod name and namespace and returns the current logs (streaming is NOT enabled).
-func (c *Client) GetPodLogs(name, ns string) (string, error) {
+func (c *Client) GetPodLogs(name, ns string) (io.ReadCloser, error) {
 	client, err := c.KubernetesClientSet()
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 	req := client.CoreV1().Pods(ns).GetLogs(name, &v1.PodLogOptions{})
-	podLogs, err := req.Stream()
-	if err != nil {
-		return "", fmt.Errorf("error in opening log stream, got: %s", err)
-	}
-	defer podLogs.Close()
-
-	buf := new(bytes.Buffer)
-	_, err = io.Copy(buf, podLogs)
+	logReader, err := req.Stream()
 	if err != nil {
-		return "", fmt.Errorf("error in copy information from log stream to buf, got: %s", err)
+		return nil, fmt.Errorf("error in opening log stream, got: %s", err)
 	}
-	return buf.String(), nil
+	return logReader, nil
 }
 
 func isPodComplete(event watch.Event) (bool, error) {

pkg/releasetesting/environment.go

@@ -19,6 +19,7 @@ package releasetesting
 import (
 	"bytes"
 	"fmt"
+	"io/ioutil"
 	"log"
 	"sync"
 	"time"
@@ -140,7 +141,12 @@ func (env *Environment) GetLogs(testManifests []string) {
 			continue
 		}
 		podName := infos[0].Object.(*v1.Pod).Name
-		logs, err := env.KubeClient.GetPodLogs(podName, env.Namespace)
+		lr, err := env.KubeClient.GetPodLogs(podName, env.Namespace)
+		if err != nil {
+			env.streamError(err.Error())
+			continue
+		}
+		logs, err := ioutil.ReadAll(lr)
 		if err != nil {
 			env.streamError(err.Error())
 			continue

pkg/tiller/environment/environment.go

@@ -175,7 +175,7 @@ type KubeClient interface {
 	// and returns said phase (PodSucceeded or PodFailed qualify).
 	WaitAndGetCompletedPodPhase(namespace string, reader io.Reader, timeout time.Duration) (v1.PodPhase, error)
 
-	GetPodLogs(name, namespace string) (string, error)
+	GetPodLogs(name, namespace string) (io.ReadCloser, error)
 
 	WaitUntilCRDEstablished(reader io.Reader, timeout time.Duration) error
 }
@@ -258,8 +258,8 @@ func (p *PrintingKubeClient) WaitAndGetCompletedPodPhase(namespace string, reade
 }
 
 // GetPodLogs implements KubeClient GetPodLogs.
-func (p *PrintingKubeClient) GetPodLogs(name, ns string) (string, error) {
-	return "", nil
+func (p *PrintingKubeClient) GetPodLogs(name, ns string) (io.ReadCloser, error) {
+	return nil, nil
 }
 
 // WaitUntilCRDEstablished implements KubeClient WaitUntilCRDEstablished.

pkg/tiller/environment/environment_test.go

@@ -78,8 +78,8 @@ func (k *mockKubeClient) WaitAndGetCompletedPodStatus(namespace string, reader i
 	return "", nil
 }
 
-func (k *mockKubeClient) GetPodLogs(name, namespace string) (string, error) {
-	return "", nil
+func (k *mockKubeClient) GetPodLogs(name, namespace string) (io.ReadCloser, error) {
+	return nil, nil
 }
 
 func (k *mockKubeClient) WaitUntilCRDEstablished(reader io.Reader, timeout time.Duration) error {

pkg/tiller/release_server_test.go

@@ -679,8 +679,8 @@ func (kc *mockHooksKubeClient) Validate(ns string, reader io.Reader) error {
 func (kc *mockHooksKubeClient) WaitAndGetCompletedPodPhase(namespace string, reader io.Reader, timeout time.Duration) (v1.PodPhase, error) {
 	return v1.PodUnknown, nil
 }
-func (kc *mockHooksKubeClient) GetPodLogs(name, namespace string) (string, error) {
-	return "", nil
+func (kc *mockHooksKubeClient) GetPodLogs(name, namespace string) (io.ReadCloser, error) {
+	return nil, nil
 }
 
 func (kc *mockHooksKubeClient) WaitUntilCRDEstablished(reader io.Reader, timeout time.Duration) error {