Require a clean golint

Some of my comments/changes might not be great, but its better than
where we were!

.travis.yml

@@ -12,10 +12,10 @@ install:
   - mkdir -p $HOME/gopath/src/k8s.io
   - mv $TRAVIS_BUILD_DIR $HOME/gopath/src/k8s.io/contrib
   - go get github.com/tools/godep
+  - go get github.com/golang/lint/golint
   - export PATH=$GOPATH/bin:$PATH
   - godep go install ./...
 
-
 script:
   - hack/verify-all.sh
   - godep go test ./...

diurnal/dc.go

@@ -106,16 +106,14 @@ func parseTimeCounts(times string, counts string) ([]timeCount, error) {
 	return tc, nil
 }
 
-type Scaler struct {
+type scaler struct {
 	timeCounts []timeCount
 	selector   labels.Selector
 	start      time.Time
 	pos        int
 	done       chan struct{}
 }
 
-var posError = errors.New("could not find position")
-
 func findPos(tc []timeCount, cur int, offset time.Duration) int {
 	first := true
 	for i := cur; i != cur || first; i = (i + 1) % len(tc) {
@@ -127,7 +125,7 @@ func findPos(tc []timeCount, cur int, offset time.Duration) int {
 	return 0
 }
 
-func (s *Scaler) setCount(c int) {
+func (s *scaler) setCount(c int) {
 	glog.Infof("scaling to %d replicas", c)
 	rcList, err := client.ReplicationControllers(namespace).List(s.selector)
 	if err != nil {
@@ -142,15 +140,15 @@ func (s *Scaler) setCount(c int) {
 	}
 }
 
-func (s *Scaler) timeOffset() time.Duration {
+func (s *scaler) timeOffset() time.Duration {
 	return time.Since(s.start) % dayPeriod
 }
 
-func (s *Scaler) curpos(offset time.Duration) int {
+func (s *scaler) curpos(offset time.Duration) int {
 	return findPos(s.timeCounts, s.pos, offset)
 }
 
-func (s *Scaler) scale() {
+func (s *scaler) scale() {
 	for {
 		select {
 		case <-s.done:
@@ -168,7 +166,7 @@ func (s *Scaler) scale() {
 	}
 }
 
-func (s *Scaler) Start() error {
+func (s *scaler) Start() error {
 	now := time.Now().UTC()
 	s.start = time.Date(now.Year(), now.Month(), now.Day(), 0, 0, 0, 0, now.Location())
 	if *startNow {
@@ -196,7 +194,7 @@ func safeclose(c chan<- struct{}) (err error) {
 	return nil
 }
 
-func (s *Scaler) Stop() error {
+func (s *scaler) Stop() error {
 	if err := safeclose(s.done); err != nil {
 		return errors.New("already stopped scaling")
 	}
@@ -211,7 +209,7 @@ var (
 	local      = flag.Bool("local", false, "set to true if running on local machine not within cluster")
 	localPort  = flag.Int("localport", 8001, "port that kubectl proxy is running on (local must be true)")
 
-	namespace string = os.Getenv("POD_NAMESPACE")
+	namespace = os.Getenv("POD_NAMESPACE")
 
 	client *kclient.Client
 )
@@ -259,7 +257,7 @@ func main() {
 	if namespace == "" {
 		glog.Fatal("POD_NAMESPACE is not set. Set to the namespace of the replication controller if running locally.")
 	}
-	scaler := Scaler{timeCounts: tc, selector: selector}
+	scaler := scaler{timeCounts: tc, selector: selector}
 	if err != nil {
 		glog.Fatal(err)
 	}

for-demos/serve_hostname/serve_hostname.go

@@ -27,16 +27,16 @@ import (
 )
 
 var (
-	doTcp  = flag.Bool("tcp", false, "Serve raw over TCP.")
-	doUdp  = flag.Bool("udp", false, "Serve raw over UDP.")
-	doHttp = flag.Bool("http", true, "Serve HTTP.")
+	doTCP  = flag.Bool("tcp", false, "Serve raw over TCP.")
+	doUDP  = flag.Bool("udp", false, "Serve raw over UDP.")
+	doHTTP = flag.Bool("http", true, "Serve HTTP.")
 	port   = flag.Int("port", 9376, "Port number.")
 )
 
 func main() {
 	flag.Parse()
 
-	if *doHttp && (*doTcp || *doUdp) {
+	if *doHTTP && (*doTCP || *doUDP) {
 		log.Fatalf("Can't server TCP/UDP mode and HTTP mode at the same time")
 	}
 
@@ -45,7 +45,7 @@ func main() {
 		log.Fatalf("Error from os.Hostname(): %s", err)
 	}
 
-	if *doTcp {
+	if *doTCP {
 		listener, err := net.Listen("tcp", fmt.Sprintf(":%d", *port))
 		if err != nil {
 			log.Fatalf("Error from net.Listen(): %s", err)
@@ -62,7 +62,7 @@ func main() {
 			}
 		}()
 	}
-	if *doUdp {
+	if *doUDP {
 		addr, err := net.ResolveUDPAddr("udp", fmt.Sprintf(":%d", *port))
 		if err != nil {
 			log.Fatalf("Error from net.ResolveUDPAddr(): %s", err)
@@ -83,7 +83,7 @@ func main() {
 			}
 		}()
 	}
-	if *doHttp {
+	if *doHTTP {
 		http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
 			log.Printf("HTTP request from %s", r.RemoteAddr)
 			fmt.Fprintf(w, "%s", hostname)