rootfs readonly test

Signed-off-by: liang chenye <liangchenye@huawei.com>

cmd/runtimetest/main.go

@@ -218,6 +218,16 @@ func mountMatch(specMount rspec.Mount, sysMount rspec.Mount) error {
 	return nil
 }
 
+func containString(opts []string, str string) bool {
+	for _, opt := range opts {
+		if opt == str {
+			return true
+		}
+	}
+
+	return false
+}
+
 func validateMounts(spec *rspec.Spec) error {
 	fmt.Println("validating mounts")
 	infos, err := mount.GetMounts()
@@ -227,11 +237,21 @@ func validateMounts(spec *rspec.Spec) error {
 
 	mountsMap := make(map[string]rspec.Mount)
 	for _, info := range infos {
+		opts := strings.Split(info.Opts, ",")
+
+		if info.Mountpoint == "/" {
+			if spec.Root.Readonly && !containString(opts, "ro") ||
+				!spec.Root.Readonly && !containString(opts, "rw") {
+				return fmt.Errorf("root readonly expected: %v, actual: %v", spec.Root.Readonly, !spec.Root.Readonly)
+			}
+		}
+
 		mountsMap[info.Mountpoint] = rspec.Mount{
 			Destination: info.Mountpoint,
 			Type:        info.Fstype,
 			Source:      info.Source,
-			Options:     append(strings.Split(info.Opts, ","), strings.Split(info.VfsOpts, ",")...)}
+			Options:     append(opts, strings.Split(info.VfsOpts, ",")...)}
+
 	}
 
 	for _, specMount := range spec.Mounts {