runtimetest: add validation of cgroups path

Signed-off-by: Ma Shimiao <mashimiao.fnst@cn.fujitsu.com>

cmd/runtimetest/main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"bytes"
+	"bufio"
 	"encoding/json"
 	"fmt"
 	"io"
@@ -244,6 +245,45 @@ func validateROPaths(spec *rspec.Spec) error {
 	return nil
 }
 
+func getThisCgroupPath(subsystem string) (string, error) {
+	f, err := os.Open("/proc/self/cgroup")
+	if err != nil {
+		return "", err
+	}
+	defer f.Close()
+
+	s := bufio.NewScanner(f)
+	for s.Scan() {
+		if err := s.Err(); err != nil {
+			return "", err
+		}
+
+		text := s.Text()
+		parts := strings.Split(text, ":")
+
+		for _, subs := range strings.Split(parts[1], ",") {
+			if subs == subsystem {
+				return parts[2], nil
+			}
+		}
+	}
+	return "", fmt.Errorf("cgroup %v not found", subsystem)
+}
+
+func validateCgroupsPath(spec *rspec.Spec) error {
+	fmt.Println("validating cgroupsPath")
+	expectedPath := spec.Linux.CgroupsPath
+	actualPath, err := getThisCgroupPath("devices")
+	if err != nil {
+		return err
+	}
+
+	if expectedPath != nil && *expectedPath != actualPath {
+		return fmt.Errorf("Cgroup path expected: %v, actual: %v", *expectedPath, actualPath)
+	}
+	return nil
+}
+
 func main() {
 	spec, err := loadSpecConfig()
 	if err != nil {
@@ -254,6 +294,7 @@ func main() {
 		validateRootFS,
 		validateProcess,
 		validateCapabilities,
+		validateCgroupsPath,
 		validateHostname,
 		validateRlimits,
 		validateSysctls,