package validate import ( "bufio" "encoding/json" "errors" "fmt" "io/ioutil" "net" "os" "path/filepath" "reflect" "regexp" "runtime" "strings" "unicode" "unicode/utf8" "github.com/blang/semver" "github.com/hashicorp/go-multierror" rspec "github.com/opencontainers/runtime-spec/specs-go" osFilepath "github.com/opencontainers/runtime-tools/filepath" "github.com/sirupsen/logrus" "github.com/syndtr/gocapability/capability" "github.com/opencontainers/runtime-tools/specerror" "github.com/xeipuuv/gojsonschema" ) const specConfig = "config.json" var ( // http://pubs.opengroup.org/onlinepubs/9699919799/functions/getrlimit.html posixRlimits = []string{ "RLIMIT_AS", "RLIMIT_CORE", "RLIMIT_CPU", "RLIMIT_DATA", "RLIMIT_FSIZE", "RLIMIT_NOFILE", "RLIMIT_STACK", } // https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/man2/getrlimit.2?h=man-pages-4.13 linuxRlimits = append(posixRlimits, []string{ "RLIMIT_MEMLOCK", "RLIMIT_MSGQUEUE", "RLIMIT_NICE", "RLIMIT_NPROC", "RLIMIT_RSS", "RLIMIT_RTPRIO", "RLIMIT_RTTIME", "RLIMIT_SIGPENDING", }...) configSchemaTemplate = "https://raw.githubusercontent.com/opencontainers/runtime-spec/v%s/schema/config-schema.json" ) // Validator represents a validator for runtime bundle type Validator struct { spec *rspec.Spec bundlePath string HostSpecific bool platform string } // NewValidator creates a Validator func NewValidator(spec *rspec.Spec, bundlePath string, hostSpecific bool, platform string) (Validator, error) { if hostSpecific && platform != runtime.GOOS { return Validator{}, fmt.Errorf("When hostSpecific is set, platform must be same as the host platform") } return Validator{ spec: spec, bundlePath: bundlePath, HostSpecific: hostSpecific, platform: platform, }, nil } // NewValidatorFromPath creates a Validator with specified bundle path func NewValidatorFromPath(bundlePath string, hostSpecific bool, platform string) (Validator, error) { if bundlePath == "" { return Validator{}, fmt.Errorf("bundle path shouldn't be empty") } if _, err := os.Stat(bundlePath); err != nil { return Validator{}, err } configPath := filepath.Join(bundlePath, specConfig) content, err := ioutil.ReadFile(configPath) if err != nil { return Validator{}, specerror.NewError(specerror.ConfigInRootBundleDir, err, rspec.Version) } if !utf8.Valid(content) { return Validator{}, fmt.Errorf("%q is not encoded in UTF-8", configPath) } var spec rspec.Spec if err = json.Unmarshal(content, &spec); err != nil { return Validator{}, err } return NewValidator(&spec, bundlePath, hostSpecific, platform) } // CheckAll checks all parts of runtime bundle func (v *Validator) CheckAll() error { var errs *multierror.Error errs = multierror.Append(errs, v.CheckJSONSchema()) errs = multierror.Append(errs, v.CheckPlatform()) errs = multierror.Append(errs, v.CheckRoot()) errs = multierror.Append(errs, v.CheckMandatoryFields()) errs = multierror.Append(errs, v.CheckSemVer()) errs = multierror.Append(errs, v.CheckMounts()) errs = multierror.Append(errs, v.CheckProcess()) errs = multierror.Append(errs, v.CheckLinux()) errs = multierror.Append(errs, v.CheckAnnotations()) if v.platform == "linux" || v.platform == "solaris" { errs = multierror.Append(errs, v.CheckHooks()) } return errs.ErrorOrNil() } // JSONSchemaURL returns the URL for the JSON Schema specifying the // configuration format. It consumes configSchemaTemplate, but we // provide it as a function to isolate consumers from inconsistent // naming as runtime-spec evolves. func JSONSchemaURL(version string) (url string, err error) { ver, err := semver.Parse(version) if err != nil { return "", specerror.NewError(specerror.SpecVersionInSemVer, err, rspec.Version) } if ver.LT(semver.Version{Major: 1, Minor: 0, Patch: 2}) { return "", errors.New("unsupported configuration version (older than 1.0.2)") } return fmt.Sprintf(configSchemaTemplate, version), nil } // CheckJSONSchema validates the configuration against the // runtime-spec JSON Schema, using the version of the schema that // matches the configuration's declared version. func (v *Validator) CheckJSONSchema() (errs error) { logrus.Debugf("check JSON schema") url, err := JSONSchemaURL(strings.TrimSuffix(v.spec.Version, "-dev")) if err != nil { errs = multierror.Append(errs, err) return errs } schemaLoader := gojsonschema.NewReferenceLoader(url) documentLoader := gojsonschema.NewGoLoader(v.spec) result, err := gojsonschema.Validate(schemaLoader, documentLoader) if err != nil { errs = multierror.Append(errs, err) return errs } if !result.Valid() { for _, resultError := range result.Errors() { errs = multierror.Append(errs, errors.New(resultError.String())) } } return errs } // CheckRoot checks status of v.spec.Root func (v *Validator) CheckRoot() (errs error) { logrus.Debugf("check root") if v.platform == "windows" && v.spec.Windows != nil { if v.spec.Windows.HyperV != nil { if v.spec.Root != nil { errs = multierror.Append(errs, specerror.NewError(specerror.RootOnHyperVNotSet, fmt.Errorf("for Hyper-V containers, Root must not be set"), rspec.Version)) } return } else if v.spec.Root == nil { errs = multierror.Append(errs, specerror.NewError(specerror.RootOnWindowsRequired, fmt.Errorf("on Windows, for Windows Server Containers, this field is REQUIRED"), rspec.Version)) return } } else if v.platform != "windows" && v.spec.Root == nil { errs = multierror.Append(errs, specerror.NewError(specerror.RootOnNonWindowsRequired, fmt.Errorf("on all other platforms, this field is REQUIRED"), rspec.Version)) return } if v.platform == "windows" { matched, err := regexp.MatchString(`\\\\[?]\\Volume[{][a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}[}]\\`, v.spec.Root.Path) if err != nil { errs = multierror.Append(errs, err) } else if !matched { errs = multierror.Append(errs, specerror.NewError(specerror.RootPathOnWindowsGUID, fmt.Errorf("root.path is %q, but it MUST be a volume GUID path when target platform is windows", v.spec.Root.Path), rspec.Version)) } if v.spec.Root.Readonly { errs = multierror.Append(errs, specerror.NewError(specerror.RootReadonlyOnWindowsFalse, fmt.Errorf("root.readonly field MUST be omitted or false when target platform is windows"), rspec.Version)) } return } absBundlePath, err := filepath.Abs(v.bundlePath) if err != nil { errs = multierror.Append(errs, fmt.Errorf("unable to convert %q to an absolute path", v.bundlePath)) return } if filepath.Base(v.spec.Root.Path) != "rootfs" { errs = multierror.Append(errs, specerror.NewError(specerror.RootPathOnPosixConvention, fmt.Errorf("path name should be the conventional 'rootfs'"), rspec.Version)) } var rootfsPath string var absRootPath string if filepath.IsAbs(v.spec.Root.Path) { rootfsPath = v.spec.Root.Path absRootPath = filepath.Clean(rootfsPath) } else { var err error rootfsPath = filepath.Join(v.bundlePath, v.spec.Root.Path) absRootPath, err = filepath.Abs(rootfsPath) if err != nil { errs = multierror.Append(errs, fmt.Errorf("unable to convert %q to an absolute path", rootfsPath)) return } } if fi, err := os.Stat(rootfsPath); err != nil { errs = multierror.Append(errs, specerror.NewError(specerror.RootPathExist, fmt.Errorf("cannot find the root path %q", rootfsPath), rspec.Version)) } else if !fi.IsDir() { errs = multierror.Append(errs, specerror.NewError(specerror.RootPathExist, fmt.Errorf("root.path %q is not a directory", rootfsPath), rspec.Version)) } rootParent := filepath.Dir(absRootPath) if absRootPath == string(filepath.Separator) || rootParent != absBundlePath { errs = multierror.Append(errs, specerror.NewError(specerror.ArtifactsInSingleDir, fmt.Errorf("root.path is %q, but it MUST be a child of %q", v.spec.Root.Path, absBundlePath), rspec.Version)) } return } // CheckSemVer checks v.spec.Version func (v *Validator) CheckSemVer() (errs error) { logrus.Debugf("check semver") version := v.spec.Version _, err := semver.Parse(version) if err != nil { errs = multierror.Append(errs, specerror.NewError(specerror.SpecVersionInSemVer, fmt.Errorf("%q is not valid SemVer: %s", version, err.Error()), rspec.Version)) } if version != rspec.Version { errs = multierror.Append(errs, fmt.Errorf("validate currently only handles version %s, but the supplied configuration targets %s", rspec.Version, version)) } return } // CheckHooks check v.spec.Hooks func (v *Validator) CheckHooks() (errs error) { logrus.Debugf("check hooks") if v.platform != "linux" && v.platform != "solaris" { errs = multierror.Append(errs, fmt.Errorf("For %q platform, the configuration structure does not support hooks", v.platform)) return } if v.spec.Hooks != nil { errs = multierror.Append(errs, v.checkEventHooks("prestart", v.spec.Hooks.Prestart, v.HostSpecific)) errs = multierror.Append(errs, v.checkEventHooks("poststart", v.spec.Hooks.Poststart, v.HostSpecific)) errs = multierror.Append(errs, v.checkEventHooks("poststop", v.spec.Hooks.Poststop, v.HostSpecific)) } return } func (v *Validator) checkEventHooks(hookType string, hooks []rspec.Hook, hostSpecific bool) (errs error) { for i, hook := range hooks { if !osFilepath.IsAbs(v.platform, hook.Path) { errs = multierror.Append(errs, specerror.NewError( specerror.PosixHooksPathAbs, fmt.Errorf("hooks.%s[%d].path %v: is not absolute path", hookType, i, hook.Path), rspec.Version)) } if hostSpecific { fi, err := os.Stat(hook.Path) if err != nil { errs = multierror.Append(errs, fmt.Errorf("cannot find %s hook: %v", hookType, hook.Path)) } if fi.Mode()&0111 == 0 { errs = multierror.Append(errs, fmt.Errorf("the %s hook %v: is not executable", hookType, hook.Path)) } } for _, env := range hook.Env { if !envValid(env) { errs = multierror.Append(errs, fmt.Errorf("env %q for hook %v is in the invalid form", env, hook.Path)) } } } return } // CheckProcess checks v.spec.Process func (v *Validator) CheckProcess() (errs error) { logrus.Debugf("check process") if v.spec.Process == nil { return } process := v.spec.Process if !osFilepath.IsAbs(v.platform, process.Cwd) { errs = multierror.Append(errs, specerror.NewError( specerror.ProcCwdAbs, fmt.Errorf("cwd %q is not an absolute path", process.Cwd), rspec.Version)) } for _, env := range process.Env { if !envValid(env) { errs = multierror.Append(errs, fmt.Errorf("env %q should be in the form of 'key=value'. The left hand side must consist solely of letters, digits, and underscores '_'", env)) } } if len(process.Args) == 0 { errs = multierror.Append(errs, specerror.NewError( specerror.ProcArgsOneEntryRequired, fmt.Errorf("args must not be empty"), rspec.Version)) } else { if filepath.IsAbs(process.Args[0]) && v.spec.Root != nil { var rootfsPath string if filepath.IsAbs(v.spec.Root.Path) { rootfsPath = v.spec.Root.Path } else { rootfsPath = filepath.Join(v.bundlePath, v.spec.Root.Path) } absPath := filepath.Join(rootfsPath, process.Args[0]) fileinfo, err := os.Stat(absPath) if os.IsNotExist(err) { logrus.Warnf("executable %q is not available in rootfs currently", process.Args[0]) } else if err != nil { errs = multierror.Append(errs, err) } else { m := fileinfo.Mode() if m.IsDir() || m&0111 == 0 { errs = multierror.Append(errs, fmt.Errorf("arg %q is not executable", process.Args[0])) } } } } if v.platform == "linux" || v.platform == "solaris" { errs = multierror.Append(errs, v.CheckRlimits()) } if v.platform == "linux" { if v.spec.Process.Capabilities != nil { errs = multierror.Append(errs, v.CheckCapabilities()) } if len(process.ApparmorProfile) > 0 { profilePath := filepath.Join(v.bundlePath, v.spec.Root.Path, "/etc/apparmor.d", process.ApparmorProfile) _, err := os.Stat(profilePath) if err != nil { errs = multierror.Append(errs, err) } } } return } // CheckCapabilities checks v.spec.Process.Capabilities func (v *Validator) CheckCapabilities() (errs error) { if v.platform != "linux" { errs = multierror.Append(errs, fmt.Errorf("For %q platform, the configuration structure does not support process.capabilities", v.platform)) return } process := v.spec.Process var effective, permitted, inheritable, ambient bool caps := make(map[string][]string) for _, cap := range process.Capabilities.Bounding { caps[cap] = append(caps[cap], "bounding") } for _, cap := range process.Capabilities.Effective { caps[cap] = append(caps[cap], "effective") } for _, cap := range process.Capabilities.Inheritable { caps[cap] = append(caps[cap], "inheritable") } for _, cap := range process.Capabilities.Permitted { caps[cap] = append(caps[cap], "permitted") } for _, cap := range process.Capabilities.Ambient { caps[cap] = append(caps[cap], "ambient") } for capability, owns := range caps { if err := CapValid(capability, v.HostSpecific); err != nil { errs = multierror.Append(errs, fmt.Errorf("capability %q is not valid, man capabilities(7)", capability)) } effective, permitted, ambient, inheritable = false, false, false, false for _, set := range owns { if set == "effective" { effective = true continue } if set == "inheritable" { inheritable = true continue } if set == "permitted" { permitted = true continue } if set == "ambient" { ambient = true continue } } if effective && !permitted { errs = multierror.Append(errs, fmt.Errorf("effective capability %q is not allowed, as it's not permitted", capability)) } if ambient && !(permitted && inheritable) { errs = multierror.Append(errs, fmt.Errorf("ambient capability %q is not allowed, as it's not permitted and inheribate", capability)) } } return } // CheckRlimits checks v.spec.Process.Rlimits func (v *Validator) CheckRlimits() (errs error) { if v.platform != "linux" && v.platform != "solaris" { errs = multierror.Append(errs, fmt.Errorf("For %q platform, the configuration structure does not support process.rlimits", v.platform)) return } process := v.spec.Process for index, rlimit := range process.Rlimits { for i := index + 1; i < len(process.Rlimits); i++ { if process.Rlimits[index].Type == process.Rlimits[i].Type { errs = multierror.Append(errs, specerror.NewError( specerror.PosixProcRlimitsErrorOnDup, fmt.Errorf("rlimit can not contain the same type %q", process.Rlimits[index].Type), rspec.Version)) } } errs = multierror.Append(errs, v.rlimitValid(rlimit)) } return } func supportedMountTypes(OS string, hostSpecific bool) (map[string]bool, error) { supportedTypes := make(map[string]bool) if OS != "linux" && OS != "windows" { logrus.Warnf("%v is not supported to check mount type", OS) return nil, nil } else if OS == "windows" { supportedTypes["ntfs"] = true return supportedTypes, nil } if hostSpecific { f, err := os.Open("/proc/filesystems") if err != nil { return nil, err } defer f.Close() s := bufio.NewScanner(f) for s.Scan() { if err := s.Err(); err != nil { return supportedTypes, err } text := s.Text() parts := strings.Split(text, "\t") if len(parts) > 1 { supportedTypes[parts[1]] = true } else { supportedTypes[parts[0]] = true } } supportedTypes["bind"] = true return supportedTypes, nil } logrus.Warn("Checking linux mount types without --host-specific is not supported yet") return nil, nil } // CheckMounts checks v.spec.Mounts func (v *Validator) CheckMounts() (errs error) { logrus.Debugf("check mounts") supportedTypes, err := supportedMountTypes(v.platform, v.HostSpecific) if err != nil { errs = multierror.Append(errs, err) return } for i, mountA := range v.spec.Mounts { if supportedTypes != nil && !supportedTypes[mountA.Type] { errs = multierror.Append(errs, fmt.Errorf("unsupported mount type %q", mountA.Type)) } if !osFilepath.IsAbs(v.platform, mountA.Destination) { errs = multierror.Append(errs, specerror.NewError( specerror.MountsDestAbs, fmt.Errorf("mounts[%d].destination %q is not absolute", i, mountA.Destination), rspec.Version)) } for j, mountB := range v.spec.Mounts { if i == j { continue } // whether B.Desination is nested within A.Destination nested, err := osFilepath.IsAncestor(v.platform, mountA.Destination, mountB.Destination, ".") if err != nil { errs = multierror.Append(errs, err) continue } if nested { if v.platform == "windows" && i < j { errs = multierror.Append(errs, specerror.NewError( specerror.MountsDestOnWindowsNotNested, fmt.Errorf("on Windows, %v nested within %v is forbidden", mountB.Destination, mountA.Destination), rspec.Version)) } if i > j { logrus.Warnf("%v will be covered by %v", mountB.Destination, mountA.Destination) } } } } return } // CheckPlatform checks v.platform func (v *Validator) CheckPlatform() (errs error) { logrus.Debugf("check platform") if v.platform != "linux" && v.platform != "solaris" && v.platform != "windows" { errs = multierror.Append(errs, fmt.Errorf("platform %q is not supported", v.platform)) return } if v.HostSpecific && v.platform != runtime.GOOS { errs = multierror.Append(errs, fmt.Errorf("platform %q differs from the host %q, skipping host-specific checks", v.platform, runtime.GOOS)) v.HostSpecific = false } if v.platform == "windows" { if v.spec.Windows == nil { errs = multierror.Append(errs, specerror.NewError( specerror.PlatformSpecConfOnWindowsSet, fmt.Errorf("'windows' MUST be set when platform is `windows`"), rspec.Version)) } } return } // CheckLinuxResources checks v.spec.Linux.Resources func (v *Validator) CheckLinuxResources() (errs error) { logrus.Debugf("check linux resources") r := v.spec.Linux.Resources if r.Memory != nil { if r.Memory.Limit != nil && r.Memory.Swap != nil && uint64(*r.Memory.Limit) > uint64(*r.Memory.Swap) { errs = multierror.Append(errs, fmt.Errorf("minimum memoryswap should be larger than memory limit")) } if r.Memory.Limit != nil && r.Memory.Reservation != nil && uint64(*r.Memory.Reservation) > uint64(*r.Memory.Limit) { errs = multierror.Append(errs, fmt.Errorf("minimum memory limit should be larger than memory reservation")) } } if r.Network != nil && v.HostSpecific { var exist bool interfaces, err := net.Interfaces() if err != nil { errs = multierror.Append(errs, err) return } for _, prio := range r.Network.Priorities { exist = false for _, ni := range interfaces { if prio.Name == ni.Name { exist = true break } } if !exist { errs = multierror.Append(errs, fmt.Errorf("interface %s does not exist currently", prio.Name)) } } } for index := 0; index < len(r.Devices); index++ { switch r.Devices[index].Type { case "a", "b", "c", "": default: errs = multierror.Append(errs, fmt.Errorf("type of devices %s is invalid", r.Devices[index].Type)) } access := []byte(r.Devices[index].Access) for i := 0; i < len(access); i++ { switch access[i] { case 'r', 'w', 'm': default: errs = multierror.Append(errs, fmt.Errorf("access %s is invalid", r.Devices[index].Access)) return } } } if r.BlockIO != nil && r.BlockIO.WeightDevice != nil { for i, weightDevice := range r.BlockIO.WeightDevice { if weightDevice.Weight == nil && weightDevice.LeafWeight == nil { errs = multierror.Append(errs, specerror.NewError( specerror.BlkIOWeightOrLeafWeightExist, fmt.Errorf("linux.resources.blockIO.weightDevice[%d] specifies neither weight nor leafWeight", i), rspec.Version)) } } } return } // CheckAnnotations checks v.spec.Annotations func (v *Validator) CheckAnnotations() (errs error) { logrus.Debugf("check annotations") reversedDomain := regexp.MustCompile(`^[A-Za-z]{2,6}(\.[A-Za-z0-9-]{1,63})+$`) for key := range v.spec.Annotations { if strings.HasPrefix(key, "org.opencontainers") { errs = multierror.Append(errs, specerror.NewError( specerror.AnnotationsKeyReservedNS, fmt.Errorf("key %q is reserved", key), rspec.Version)) } if !reversedDomain.MatchString(key) { errs = multierror.Append(errs, specerror.NewError( specerror.AnnotationsKeyReversedDomain, fmt.Errorf("key %q SHOULD be named using a reverse domain notation", key), rspec.Version)) } } return } // CapValid checks whether a capability is valid func CapValid(c string, hostSpecific bool) error { isValid := false if !strings.HasPrefix(c, "CAP_") { return fmt.Errorf("capability %s must start with CAP_", c) } for _, cap := range capability.List() { if c == fmt.Sprintf("CAP_%s", strings.ToUpper(cap.String())) { if hostSpecific && cap > LastCap() { return fmt.Errorf("%s is not supported on the current host", c) } isValid = true break } } if !isValid { return fmt.Errorf("invalid capability: %s", c) } return nil } func envValid(env string) bool { items := strings.Split(env, "=") if len(items) < 2 { return false } for i, ch := range strings.TrimSpace(items[0]) { if !unicode.IsDigit(ch) && !unicode.IsLetter(ch) && ch != '_' { return false } if i == 0 && unicode.IsDigit(ch) { logrus.Warnf("Env %v: variable name beginning with digit is not recommended.", env) } } return true } func (v *Validator) rlimitValid(rlimit rspec.POSIXRlimit) (errs error) { if rlimit.Hard < rlimit.Soft { errs = multierror.Append(errs, fmt.Errorf("hard limit of rlimit %s should not be less than soft limit", rlimit.Type)) } if v.platform == "linux" { for _, val := range linuxRlimits { if val == rlimit.Type { return } } errs = multierror.Append(errs, specerror.NewError(specerror.PosixProcRlimitsTypeValueError, fmt.Errorf("rlimit type %q may not be valid", rlimit.Type), v.spec.Version)) } else if v.platform == "solaris" { for _, val := range posixRlimits { if val == rlimit.Type { return } } errs = multierror.Append(errs, specerror.NewError(specerror.PosixProcRlimitsTypeValueError, fmt.Errorf("rlimit type %q may not be valid", rlimit.Type), v.spec.Version)) } else { logrus.Warnf("process.rlimits validation not yet implemented for platform %q", v.platform) } return } func isStruct(t reflect.Type) bool { return t.Kind() == reflect.Struct } func isStructPtr(t reflect.Type) bool { return t.Kind() == reflect.Ptr && t.Elem().Kind() == reflect.Struct } func checkMandatoryUnit(field reflect.Value, tagField reflect.StructField, parent string) (errs error) { mandatory := !strings.Contains(tagField.Tag.Get("json"), "omitempty") switch field.Kind() { case reflect.Ptr: if mandatory && field.IsNil() { errs = multierror.Append(errs, fmt.Errorf("'%s.%s' should not be empty", parent, tagField.Name)) } case reflect.String: if mandatory && (field.Len() == 0) { errs = multierror.Append(errs, fmt.Errorf("'%s.%s' should not be empty", parent, tagField.Name)) } case reflect.Slice: if mandatory && (field.IsNil() || field.Len() == 0) { errs = multierror.Append(errs, fmt.Errorf("'%s.%s' should not be empty", parent, tagField.Name)) return } for index := 0; index < field.Len(); index++ { mValue := field.Index(index) if mValue.CanInterface() { errs = multierror.Append(errs, checkMandatory(mValue.Interface())) } } case reflect.Map: if mandatory && (field.IsNil() || field.Len() == 0) { errs = multierror.Append(errs, fmt.Errorf("'%s.%s' should not be empty", parent, tagField.Name)) return } keys := field.MapKeys() for index := 0; index < len(keys); index++ { mValue := field.MapIndex(keys[index]) if mValue.CanInterface() { errs = multierror.Append(errs, checkMandatory(mValue.Interface())) } } default: } return } func checkMandatory(obj interface{}) (errs error) { objT := reflect.TypeOf(obj) objV := reflect.ValueOf(obj) if isStructPtr(objT) { objT = objT.Elem() objV = objV.Elem() } else if !isStruct(objT) { return } for i := 0; i < objT.NumField(); i++ { t := objT.Field(i).Type if isStructPtr(t) && objV.Field(i).IsNil() { if !strings.Contains(objT.Field(i).Tag.Get("json"), "omitempty") { errs = multierror.Append(errs, fmt.Errorf("'%s.%s' should not be empty", objT.Name(), objT.Field(i).Name)) } } else if (isStruct(t) || isStructPtr(t)) && objV.Field(i).CanInterface() { errs = multierror.Append(errs, checkMandatory(objV.Field(i).Interface())) } else { errs = multierror.Append(errs, checkMandatoryUnit(objV.Field(i), objT.Field(i), objT.Name())) } } return } // CheckMandatoryFields checks mandatory field of container's config file func (v *Validator) CheckMandatoryFields() error { logrus.Debugf("check mandatory fields") if v.spec == nil { return fmt.Errorf("Spec can't be nil") } return checkMandatory(v.spec) }