Add viper support to core e2es

rebase

Godeps/Godeps.json

@@ -1403,10 +1403,6 @@
 			"ImportPath": "github.com/hashicorp/hcl/json/token",
 			"Rev": "d8c773c4cba11b11539e3d45f93daeaa5dcf1fa1"
 		},
-		{
-			"ImportPath": "github.com/hashicorp/raft-boltdb",
-			"Rev": "d1e82c1ec3f15ee991f7cc7ffd5b67ff6f5bbaee"
-		},
 		{
 			"ImportPath": "github.com/hawkular/hawkular-client-go/metrics",
 			"Comment": "v0.5.1-1-g1d46ce7",
@@ -2160,6 +2156,10 @@
 			"ImportPath": "github.com/spf13/pflag",
 			"Rev": "1560c1005499d61b80f865c04d39ca7505bf7f0b"
 		},
+		{
+			"ImportPath": "github.com/spf13/viper",
+			"Rev": "7fb2782df3d83e0036cc89f461ed0422628776f4"
+		},
 		{
 			"ImportPath": "github.com/square/go-jose",
 			"Rev": "789a4c4bd4c118f7564954f441b29c153ccd6a96"
@@ -2172,10 +2172,6 @@
 			"ImportPath": "github.com/square/go-jose/json",
 			"Rev": "789a4c4bd4c118f7564954f441b29c153ccd6a96"
 		},
-		{
-			"ImportPath": "github.com/spf13/viper",
-			"Rev": "7fb2782df3d83e0036cc89f461ed0422628776f4"
-		},
 		{
 			"ImportPath": "github.com/stretchr/objx",
 			"Rev": "1a9d0bb9f541897e62256577b352fdbc1fb4fd94"

test/e2e/e2e-example-config.json

@@ -0,0 +1,3 @@
+{
+	"provider":"local"
+}

test/e2e/e2e_test.go

@@ -23,8 +23,7 @@ import (
 )
 
 func init() {
-	framework.RegisterCommonFlags()
-	framework.RegisterClusterFlags()
+	framework.ViperizeFlags()
 }
 
 func TestE2E(t *testing.T) {

test/e2e/framework/test_context.go

@@ -21,7 +21,9 @@ import (
 	"os"
 	"time"
 
+	glog "github.com/golang/glog"
 	"github.com/onsi/ginkgo/config"
+	"github.com/spf13/viper"
 	"k8s.io/kubernetes/pkg/client/unversioned/clientcmd"
 	"k8s.io/kubernetes/pkg/cloudprovider"
 )
@@ -34,7 +36,8 @@ type TestContextType struct {
 	CertDir            string
 	Host               string
 	// TODO: Deprecating this over time... instead just use gobindata_util.go , see #23987.
-	RepoRoot       string
+	RepoRoot string
+
 	Provider       string
 	CloudConfig    CloudConfig
 	KubectlPath    string
@@ -181,3 +184,28 @@ func RegisterNodeFlags() {
 	flag.StringVar(&TestContext.EvictionHard, "eviction-hard", "memory.available<250Mi,imagefs.available<10%", "The hard eviction thresholds. If set, pods get evicted when the specified resources drop below the thresholds.")
 	flag.StringVar(&TestContext.ManifestPath, "manifest-path", "", "The path to the static pod manifest file.")
 }
+
+// Enable viper configuration management of flags.
+func ViperizeFlags() {
+	// Add viper in a minimal way.
+	// Flag interop isnt possible, since 'go test' coupling to flag.Parse.
+	viper.SetConfigName("e2e")
+	viper.AddConfigPath(".")
+	viper.ReadInConfig()
+
+	// TODO @jayunit100: Maybe a more elegant viper-flag integration for the future?
+	// For now, we layer it on top, because 'flag' deps of 'go test' make pflag wrappers
+	// fragile, seeming to force 'flag' to have deep awareness of pflag params.
+	RegisterCommonFlags()
+	RegisterClusterFlags()
+	flag.Parse()
+
+	viperFlagSetter := func(f *flag.Flag) {
+		if viper.IsSet(f.Name) {
+			glog.V(4).Infof("[viper config] Overwriting, found a settting for %v %v", f.Name, f.Value)
+			f.Value.Set(viper.GetString(f.Name))
+		}
+	}
+	// Each flag that we've declared can be set via viper.
+	flag.VisitAll(viperFlagSetter)
+}