Made a few changes to make testutil.Docker easier to use

PiperOrigin-RevId: 215023376
Change-Id: I139569bd15c013e5dd0f60d0c98a64eaa0ba9e8e

runsc/test/image/image_test.go

@@ -40,7 +40,7 @@ import (
 
 func TestHelloWorld(t *testing.T) {
 	d := testutil.MakeDocker("hello-test")
-	if _, err := d.Run("hello-world"); err != nil {
+	if err := d.Run("hello-world"); err != nil {
 		t.Fatalf("docker run failed: %v", err)
 	}
 	defer d.CleanUp()
@@ -94,7 +94,8 @@ func TestHttpd(t *testing.T) {
 	}
 
 	// Start the container.
-	if _, err := d.Run("-p", "80", "-v", testutil.MountArg(dir, "/usr/local/apache2/htdocs:ro"), "httpd"); err != nil {
+	mountArg := testutil.MountArg(dir, "/usr/local/apache2/htdocs", testutil.ReadOnly)
+	if err := d.Run("-p", "80", mountArg, "httpd"); err != nil {
 		t.Fatalf("docker run failed: %v", err)
 	}
 	defer d.CleanUp()
@@ -127,7 +128,8 @@ func TestNginx(t *testing.T) {
 	}
 
 	// Start the container.
-	if _, err := d.Run("-p", "80", "-v", testutil.MountArg(dir, "/usr/share/nginx/html:ro"), "nginx"); err != nil {
+	mountArg := testutil.MountArg(dir, "/usr/share/nginx/html", testutil.ReadOnly)
+	if err := d.Run("-p", "80", mountArg, "nginx"); err != nil {
 		t.Fatalf("docker run failed: %v", err)
 	}
 	defer d.CleanUp()
@@ -155,7 +157,7 @@ func TestMysql(t *testing.T) {
 	d := testutil.MakeDocker("mysql-test")
 
 	// Start the container.
-	if _, err := d.Run("-e", "MYSQL_ROOT_PASSWORD=foobar123", "mysql"); err != nil {
+	if err := d.Run("-e", "MYSQL_ROOT_PASSWORD=foobar123", "mysql"); err != nil {
 		t.Fatalf("docker run failed: %v", err)
 	}
 	defer d.CleanUp()
@@ -174,12 +176,12 @@ func TestMysql(t *testing.T) {
 	// Tell mysql client to connect to the server and execute the file in verbose
 	// mode to verify the output.
 	args := []string{
-		"--link", testutil.LinkArg(&d, "mysql"),
-		"-v", testutil.MountArg(dir, "/sql"),
+		testutil.LinkArg(&d, "mysql"),
+		testutil.MountArg(dir, "/sql", testutil.ReadWrite),
 		"mysql",
 		"mysql", "-hmysql", "-uroot", "-pfoobar123", "-v", "-e", "source /sql/mysql.sql",
 	}
-	if _, err := client.Run(args...); err != nil {
+	if err := client.Run(args...); err != nil {
 		t.Fatalf("docker run failed: %v", err)
 	}
 	defer client.CleanUp()
@@ -198,7 +200,7 @@ func TestPythonHello(t *testing.T) {
 		t.Fatalf("docker pull failed: %v", err)
 	}
 	d := testutil.MakeDocker("python-hello-test")
-	if _, err := d.Run("-p", "8080", "google/python-hello"); err != nil {
+	if err := d.Run("-p", "8080", "google/python-hello"); err != nil {
 		t.Fatalf("docker run failed: %v", err)
 	}
 	defer d.CleanUp()
@@ -230,7 +232,7 @@ func TestTomcat(t *testing.T) {
 		t.Fatalf("docker pull failed: %v", err)
 	}
 	d := testutil.MakeDocker("tomcat-test")
-	if _, err := d.Run("-p", "8080", "tomcat:8.0"); err != nil {
+	if err := d.Run("-p", "8080", "tomcat:8.0"); err != nil {
 		t.Fatalf("docker run failed: %v", err)
 	}
 	defer d.CleanUp()

runsc/test/integration/exec_test.go

@@ -40,7 +40,7 @@ func TestExecCapabilities(t *testing.T) {
 	d := testutil.MakeDocker("exec-test")
 
 	// Start the container.
-	if _, err := d.Run("alpine", "sh", "-c", "cat /proc/self/status; sleep 100"); err != nil {
+	if err := d.Run("alpine", "sh", "-c", "cat /proc/self/status; sleep 100"); err != nil {
 		t.Fatalf("docker run failed: %v", err)
 	}
 	defer d.CleanUp()

runsc/test/integration/integration_test.go

@@ -98,8 +98,8 @@ func TestPauseResume(t *testing.T) {
 		t.Fatal("docker pull failed:", err)
 	}
 	d := testutil.MakeDocker("pause-resume-test")
-	if out, err := d.Run("-p", "8080", "google/python-hello"); err != nil {
-		t.Fatalf("docker run failed: %v\nout: %s", err, out)
+	if err := d.Run("-p", "8080", "google/python-hello"); err != nil {
+		t.Fatalf("docker run failed: %v", err)
 	}
 	defer d.CleanUp()
 
@@ -157,7 +157,7 @@ func TestConnectToSelf(t *testing.T) {
 
 	// Creates server that replies "server" and exists. Sleeps at the end because
 	// 'docker exec' gets killed if the init process exists before it can finish.
-	if _, err := d.Run("ubuntu:trusty", "/bin/sh", "-c", "echo server | nc -l -p 8080 && sleep 1"); err != nil {
+	if err := d.Run("ubuntu:trusty", "/bin/sh", "-c", "echo server | nc -l -p 8080 && sleep 1"); err != nil {
 		t.Fatal("docker run failed:", err)
 	}
 	defer d.CleanUp()

runsc/test/testutil/docker.go

@@ -65,14 +65,35 @@ func EnsureSupportedDockerVersion() {
 	}
 }
 
+// MountMode describes if the mount should be ro or rw.
+type MountMode int
+
+const (
+	// ReadOnly is what the name says.
+	ReadOnly MountMode = iota
+	// ReadWrite is what the name says.
+	ReadWrite
+)
+
+// String returns the mount mode argument for this MountMode.
+func (m MountMode) String() string {
+	switch m {
+	case ReadOnly:
+		return "ro"
+	case ReadWrite:
+		return "rw"
+	}
+	panic(fmt.Sprintf("invalid mode: %d", m))
+}
+
 // MountArg formats the volume argument to mount in the container.
-func MountArg(source, target string) string {
-	return fmt.Sprintf("%s:%s", source, target)
+func MountArg(source, target string, mode MountMode) string {
+	return fmt.Sprintf("-v=%s:%s:%v", source, target, mode)
 }
 
 // LinkArg formats the link argument.
 func LinkArg(source *Docker, target string) string {
-	return fmt.Sprintf("%s:%s", source.Name, target)
+	return fmt.Sprintf("--link=%s:%s", source.Name, target)
 }
 
 // PrepareFiles creates temp directory to copy files there. The sandbox doesn't
@@ -155,11 +176,13 @@ func (d *Docker) Stop() error {
 	return nil
 }
 
-// Run calls 'docker run' with the arguments provided.
-func (d *Docker) Run(args ...string) (string, error) {
+// Run calls 'docker run' with the arguments provided. The container starts
+// running in the backgroud and the call returns immediately.
+func (d *Docker) Run(args ...string) error {
 	a := []string{"run", "--runtime", d.Runtime, "--name", d.Name, "-d"}
 	a = append(a, args...)
-	return do(a...)
+	_, err := do(a...)
+	return err
 }
 
 // Logs calls 'docker logs'.