Use a temporary directory for the APIServer's certs

While doing that we found that we needed to refactor the fakes to handle
command line arguments which are not known up front; we do this by using
regular expresseions.

pkg/framework/test/apiserver.go

@@ -5,6 +5,7 @@ import (
 	"os/exec"
 	"time"
 
+	"github.com/onsi/gomega"
 	"github.com/onsi/gomega/gbytes"
 	"github.com/onsi/gomega/gexec"
 )
@@ -17,13 +18,25 @@ type APIServer struct {
 	session        *gexec.Session
 	stdOut         *gbytes.Buffer
 	stdErr         *gbytes.Buffer
+	certDirManager certDirManager
+}
+
+type certDirManager interface {
+	Create() (string, error)
+	Destroy() error
 }
 
 // Start starts the apiserver, and returns a gexec.Session. To stop it again, call Terminate and Wait on that session.
 func (s *APIServer) Start() error {
+	s.certDirManager = NewTempDirManager()
 	s.stdOut = gbytes.NewBuffer()
 	s.stdErr = gbytes.NewBuffer()
 
+	certDir, err := s.certDirManager.Create()
+	if err != nil {
+		return err
+	}
+
 	args := []string{
 		"--authorization-mode=Node,RBAC",
 		"--runtime-config=admissionregistration.k8s.io/v1alpha1",
@@ -35,13 +48,13 @@ func (s *APIServer) Start() error {
 		"--insecure-port=8080",
 		"--storage-backend=etcd3",
 		fmt.Sprintf("--etcd-servers=%s", s.EtcdURL),
+		fmt.Sprintf("--cert-dir=%s", certDir),
 	}
 
 	detectedStart := s.stdErr.Detect("Serving insecurely on 127.0.0.1:8080")
 	timedOut := time.After(20 * time.Second)
 
 	command := exec.Command(s.Path, args...)
-	var err error
 	s.session, err = gexec.Start(command, s.stdOut, s.stdErr)
 	if err != nil {
 		return err
@@ -59,6 +72,8 @@ func (s *APIServer) Start() error {
 func (s *APIServer) Stop() {
 	if s.session != nil {
 		s.session.Terminate().Wait(20 * time.Second)
+		err := s.certDirManager.Destroy()
+		gomega.Expect(err).NotTo(gomega.HaveOccurred())
 	}
 }
 

pkg/framework/test/assets/fakeapiserver/apiserver.go

@@ -3,21 +3,24 @@ package main
 import (
 	"fmt"
 	"os"
+	"regexp"
 	"time"
 )
 
 func main() {
-	expectedArgs := []string{
-		"--authorization-mode=Node,RBAC",
-		"--runtime-config=admissionregistration.k8s.io/v1alpha1",
-		"--v=3", "--vmodule=",
-		"--admission-control=Initializers,NamespaceLifecycle,LimitRanger,ServiceAccount,SecurityContextDeny,DefaultStorageClass,DefaultTolerationSeconds,GenericAdmissionWebhook,ResourceQuota",
-		"--admission-control-config-file=",
-		"--bind-address=0.0.0.0",
-		"--insecure-bind-address=127.0.0.1",
-		"--insecure-port=8080",
-		"--storage-backend=etcd3",
-		"--etcd-servers=the etcd url",
+	expectedArgs := []*regexp.Regexp{
+		regexp.MustCompile("^--authorization-mode=Node,RBAC$"),
+		regexp.MustCompile("^--runtime-config=admissionregistration.k8s.io/v1alpha1$"),
+		regexp.MustCompile("^--v=3$"),
+		regexp.MustCompile("^--vmodule=$"),
+		regexp.MustCompile("^--admission-control=Initializers,NamespaceLifecycle,LimitRanger,ServiceAccount,SecurityContextDeny,DefaultStorageClass,DefaultTolerationSeconds,GenericAdmissionWebhook,ResourceQuota$"),
+		regexp.MustCompile("^--admission-control-config-file=$"),
+		regexp.MustCompile("^--bind-address=0.0.0.0$"),
+		regexp.MustCompile("^--insecure-bind-address=127.0.0.1$"),
+		regexp.MustCompile("^--insecure-port=8080$"),
+		regexp.MustCompile("^--storage-backend=etcd3$"),
+		regexp.MustCompile("^--etcd-servers=the etcd url$"),
+		regexp.MustCompile("^--cert-dir=.*"),
 	}
 	numExpectedArgs := len(expectedArgs)
 	numGivenArgs := len(os.Args) - 1
@@ -27,10 +30,10 @@ func main() {
 		os.Exit(2)
 	}
 
-	for i, arg := range expectedArgs {
+	for i, argRegexp := range expectedArgs {
 		givenArg := os.Args[i+1]
-		if arg != givenArg {
-			fmt.Printf("Expected arg %s, got arg %s\n", arg, givenArg)
+		if !argRegexp.MatchString(givenArg) {
+			fmt.Printf("Expected arg '%s' to match '%s'\n", givenArg, argRegexp.String())
 			os.Exit(1)
 		}
 	}

pkg/framework/test/assets/fakeetcd/etcd.go

@@ -3,17 +3,19 @@ package main
 import (
 	"fmt"
 	"os"
+	"regexp"
 	"time"
 )
 
 func main() {
-	expectedArgs := []string{
-		"--debug",
-		"--advertise-client-urls",
-		"our etcd url",
-		"--listen-client-urls",
-		"our etcd url",
-		"--data-dir",
+	expectedArgs := []*regexp.Regexp{
+		regexp.MustCompile("^--debug$"),
+		regexp.MustCompile("^--advertise-client-urls$"),
+		regexp.MustCompile("^our etcd url$"),
+		regexp.MustCompile("^--listen-client-urls$"),
+		regexp.MustCompile("^our etcd url$"),
+		regexp.MustCompile("^--data-dir$"),
+		regexp.MustCompile("^.+"),
 	}
 	numExpectedArgs := len(expectedArgs)
 	numGivenArgs := len(os.Args) - 1
@@ -23,10 +25,10 @@ func main() {
 		os.Exit(2)
 	}
 
-	for i, arg := range expectedArgs {
+	for i, argRegexp := range expectedArgs {
 		givenArg := os.Args[i+1]
-		if arg != givenArg {
-			fmt.Printf("Expected arg %s, got arg %s\n", arg, givenArg)
+		if !argRegexp.MatchString(givenArg) {
+			fmt.Printf("Expected arg '%s' to match '%s'\n", givenArg, argRegexp.String())
 			os.Exit(1)
 		}
 	}