add defaultFS back; output 'MUST' errs when loglevel >= error

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

cmd/runtimetest/main.go

@@ -31,6 +31,13 @@ const PR_GET_NO_NEW_PRIVS = 39
 const specConfig = "config.json"
 
 var (
+	defaultFS = map[string]string{
+		"/proc":    "proc",
+		"/sys":     "sysfs",
+		"/dev/pts": "devpts",
+		"/dev/shm": "tmpfs",
+	}
+
 	defaultSymlinks = map[string]string{
 		"/dev/fd":     "/proc/self/fd",
 		"/dev/stdin":  "/proc/self/fd/0",
@@ -266,6 +273,28 @@ func validateRootFS(spec *rspec.Spec) error {
 	return nil
 }
 
+func validateDefaultFS(spec *rspec.Spec) error {
+	logrus.Debugf("validating linux default filesystem")
+
+	mountInfos, err := mount.GetMounts()
+	if err != nil {
+		return ociErr.NewOCIError(ociErr.DEFAULT_FILESYSTEMS, err.Error())
+	}
+
+	mountsMap := make(map[string]string)
+	for _, mountInfo := range mountInfos {
+		mountsMap[mountInfo.Mountpoint] = mountInfo.Fstype
+	}
+
+	for fs, fstype := range defaultFS {
+		if !(mountsMap[fs] == fstype) {
+			return ociErr.NewOCIError(ociErr.DEFAULT_FILESYSTEMS, fmt.Sprintf("%v must exist and expected type is %v", fs, fstype))
+		}
+	}
+
+	return nil
+}
+
 func validateLinuxDevices(spec *rspec.Spec) error {
 	logrus.Debugf("validating linux devices")
 
@@ -585,6 +614,10 @@ func validate(context *cli.Context) error {
 			test:        validateDefaultSymlinks,
 			description: "default symlinks",
 		},
+		{
+			test:        validateDefaultFS,
+			description: "default file system",
+		},
 		{
 			test:        validateDefaultDevices,
 			description: "default devices",