Golang errors.Errorf函數代碼示例

// Build creates a generic property that may be a Map, List or primitive.
// If it is a Map or List it will be built using the appropriate builder and constraints.
func Build(val interface{}) (Property, error) {
	if val == nil {
		return nil, nil
	}

	switch reflect.TypeOf(val).Kind() {
	case reflect.Map:
		valMap, ok := val.(map[interface{}]interface{})
		if !ok {
			return nil, bosherr.Errorf("Converting map %#v", val)
		}

		return BuildMap(valMap)

	case reflect.Slice:
		valSlice, ok := val.([]interface{})
		if !ok {
			return nil, bosherr.Errorf("Converting slice %#v", val)
		}

		return BuildList(valSlice)

	default:
		return val, nil
	}
}

func (p rootDevicePartitioner) Partition(devicePath string, partitions []Partition) error {
	existingPartitions, deviceFullSizeInBytes, err := p.getPartitions(devicePath)
	if err != nil {
		return bosherr.WrapErrorf(err, "Getting existing partitions of `%s'", devicePath)
	}
	p.logger.Debug(p.logTag, "Current partitions: %#v", existingPartitions)

	if len(existingPartitions) == 0 {
		return bosherr.Errorf("Missing first partition on `%s'", devicePath)
	}

	if p.partitionsMatch(existingPartitions[1:], partitions) {
		p.logger.Info(p.logTag, "Partitions already match, skipping partitioning")
		return nil
	}

	if len(existingPartitions) > 1 {
		p.logger.Error(p.logTag,
			"Failed to create ephemeral partitions on root device `%s'. Expected 1 partition, found %d: %s",
			devicePath,
			len(existingPartitions),
			existingPartitions,
		)
		return bosherr.Errorf("Found %d unexpected partitions on `%s'", len(existingPartitions)-1, devicePath)
	}

	// To support optimal reads on HDDs and optimal erasure on SSD: use 1MiB partition alignments.
	alignmentInBytes := uint64(1048576)

	partitionStart := p.roundUp(existingPartitions[0].EndInBytes+1, alignmentInBytes)

	for index, partition := range partitions {
		partitionEnd := partitionStart + partition.SizeInBytes - 1
		if partitionEnd >= deviceFullSizeInBytes {
			partitionEnd = deviceFullSizeInBytes - 1
			p.logger.Info(p.logTag, "Partition %d would be larger than remaining space. Reducing size to %dB", index, partitionEnd-partitionStart)
		}

		p.logger.Info(p.logTag, "Creating partition %d with start %dB and end %dB", index, partitionStart, partitionEnd)

		_, _, _, err := p.cmdRunner.RunCommand(
			"parted",
			"-s",
			devicePath,
			"unit",
			"B",
			"mkpart",
			"primary",
			fmt.Sprintf("%d", partitionStart),
			fmt.Sprintf("%d", partitionEnd),
		)

		if err != nil {
			return bosherr.WrapErrorf(err, "Partitioning disk `%s'", devicePath)
		}

		partitionStart = p.roundUp(partitionEnd+1, alignmentInBytes)
	}
	return nil
}

func (creator interfaceConfigurationCreator) createMultipleInterfaceConfigurations(networks boshsettings.Networks, interfacesByMAC map[string]string) ([]StaticInterfaceConfiguration, []DHCPInterfaceConfiguration, error) {
	if len(interfacesByMAC) < len(networks) {
		return nil, nil, bosherr.Errorf("Number of network settings '%d' is greater than the number of network devices '%d'", len(networks), len(interfacesByMAC))
	}

	for name := range networks {
		if mac := networks[name].Mac; mac != "" {
			if _, ok := interfacesByMAC[mac]; !ok {
				return nil, nil, bosherr.Errorf("No device found for network '%s' with MAC address '%s'", name, mac)
			}
		}
	}

	// Configure interfaces with network settings matching MAC address.
	// If we cannot find a network setting with a matching MAC address, configure that interface as DHCP
	var networkSettings boshsettings.Network
	var err error
	staticConfigs := []StaticInterfaceConfiguration{}
	dhcpConfigs := []DHCPInterfaceConfiguration{}

	for mac, ifaceName := range interfacesByMAC {
		networkSettings, _ = networks.NetworkForMac(mac)
		staticConfigs, dhcpConfigs, err = creator.createInterfaceConfiguration(staticConfigs, dhcpConfigs, ifaceName, networkSettings)
		if err != nil {
			return nil, nil, bosherr.WrapError(err, "Creating interface configuration")
		}
	}

	return staticConfigs, dhcpConfigs, nil
}

func (r ipResolver) GetPrimaryIPv4(interfaceName string) (*gonet.IPNet, error) {
	addrs, err := r.ifaceToAddrsFunc(interfaceName)
	if err != nil {
		return nil, bosherr.WrapErrorf(err, "Looking up addresses for interface '%s'", interfaceName)
	}

	if len(addrs) == 0 {
		return nil, bosherr.Errorf("No addresses found for interface '%s'", interfaceName)
	}

	for _, addr := range addrs {
		ip, ok := addr.(*gonet.IPNet)
		if !ok {
			continue
		}

		// ignore ipv6
		if ip.IP.To4() == nil {
			continue
		}

		return ip, nil
	}

	return nil, bosherr.Errorf("Failed to find primary IPv4 address for interface '%s'", interfaceName)
}

func (c *agentClient) CompilePackage(packageSource agentclient.BlobRef, compiledPackageDependencies []agentclient.BlobRef) (compiledPackageRef agentclient.BlobRef, err error) {
	dependencies := make(map[string]BlobRef, len(compiledPackageDependencies))
	for _, dependency := range compiledPackageDependencies {
		dependencies[dependency.Name] = BlobRef{
			Name:        dependency.Name,
			Version:     dependency.Version,
			SHA1:        dependency.SHA1,
			BlobstoreID: dependency.BlobstoreID,
		}
	}

	args := []interface{}{
		packageSource.BlobstoreID,
		packageSource.SHA1,
		packageSource.Name,
		packageSource.Version,
		dependencies,
	}

	responseValue, err := c.sendAsyncTaskMessage("compile_package", args)
	if err != nil {
		return agentclient.BlobRef{}, bosherr.WrapError(err, "Sending 'compile_package' to the agent")
	}

	result, ok := responseValue["result"].(map[string]interface{})
	if !ok {
		return agentclient.BlobRef{}, bosherr.Errorf("Unable to parse 'compile_package' response from the agent: %#v", responseValue)
	}

	sha1, ok := result["sha1"].(string)
	if !ok {
		return agentclient.BlobRef{}, bosherr.Errorf("Unable to parse 'compile_package' response from the agent: %#v", responseValue)
	}

	blobstoreID, ok := result["blobstore_id"].(string)
	if !ok {
		return agentclient.BlobRef{}, bosherr.Errorf("Unable to parse 'compile_package' response from the agent: %#v", responseValue)
	}

	compiledPackageRef = agentclient.BlobRef{
		Name:        packageSource.Name,
		Version:     packageSource.Version,
		SHA1:        sha1,
		BlobstoreID: blobstoreID,
	}

	return compiledPackageRef, nil
}

func (p HandlerProvider) Get(
	platform boshplatform.Platform,
	dirProvider boshdir.Provider,
) (handler boshhandler.Handler, err error) {
	if p.handler != nil {
		handler = p.handler
		return
	}

	mbusURL, err := url.Parse(p.settingsService.GetSettings().Mbus)
	if err != nil {
		err = bosherr.WrapError(err, "Parsing handler URL")
		return
	}

	switch mbusURL.Scheme {
	case "nats":
		handler = NewNatsHandler(p.settingsService, yagnats.NewClient(), p.logger)
	case "https":
		handler = boshmicro.NewHTTPSHandler(mbusURL, p.logger, platform.GetFs(), dirProvider)
	default:
		err = bosherr.Errorf("Message Bus Handler with scheme %s could not be found", mbusURL.Scheme)
	}

	p.handler = handler

	return
}

func (a MountDiskAction) Run(diskCid string) (interface{}, error) {
	err := a.settingsService.LoadSettings()
	if err != nil {
		return nil, bosherr.WrapError(err, "Refreshing the settings")
	}

	settings := a.settingsService.GetSettings()

	diskSettings, found := settings.PersistentDiskSettings(diskCid)
	if !found {
		return nil, bosherr.Errorf("Persistent disk with volume id '%s' could not be found", diskCid)
	}

	mountPoint := a.dirProvider.StoreDir()

	isMountPoint, err := a.mountPoints.IsMountPoint(mountPoint)
	if err != nil {
		return nil, bosherr.WrapError(err, "Checking mount point")
	}
	if isMountPoint {
		mountPoint = a.dirProvider.StoreMigrationDir()
	}

	err = a.diskMounter.MountPersistentDisk(diskSettings, mountPoint)
	if err != nil {
		return nil, bosherr.WrapError(err, "Mounting persistent disk")
	}

	return map[string]string{}, nil
}

func (p provider) Get(name string) (Platform, error) {
	plat, found := p.platforms[name]
	if !found {
		return nil, bosherror.Errorf("Platform %s could not be found", name)
	}
	return plat, nil
}

func (b externalBlobstore) Validate() error {
	if !b.runner.CommandExists(b.executable()) {
		return bosherr.Errorf("executable %s not found in PATH", b.executable())
	}

	return b.writeConfigFile()
}

func (s concreteV1Service) PopulateDHCPNetworks(spec V1ApplySpec, settings boshsettings.Settings) (V1ApplySpec, error) {
	for networkName, networkSpec := range spec.NetworkSpecs {
		// Skip 'local' network since for vsphere/vcloud networks
		// are generated incorrectly by the bosh_cli_plugin_micro/bosh-release;
		// can be removed with new bosh micro CLI
		if networkName == "local" && networkSpec.Fields["ip"] == "127.0.0.1" {
			continue
		}

		network, ok := settings.Networks[networkName]
		if !ok {
			return V1ApplySpec{}, bosherr.Errorf("Network '%s' is not found in settings", networkName)
		}

		if !network.IsDHCP() {
			continue
		}

		spec.NetworkSpecs[networkName] = networkSpec.PopulateIPInfo(
			network.IP,
			network.Netmask,
			network.Gateway,
		)
	}

	return spec, nil
}

func (p rootDevicePartitioner) GetDeviceSizeInBytes(devicePath string) (uint64, error) {
	p.logger.Debug(p.logTag, "Getting size of disk remaining after first partition")

	stdout, _, _, err := p.cmdRunner.RunCommand("parted", "-m", devicePath, "unit", "B", "print")
	if err != nil {
		return 0, bosherr.WrapErrorf(err, "Getting remaining size of `%s'", devicePath)
	}

	allLines := strings.Split(stdout, "\n")
	if len(allLines) < 3 {
		return 0, bosherr.Errorf("Getting remaining size of `%s'", devicePath)
	}

	partitionInfoLines := allLines[1:3]
	deviceInfo := strings.Split(partitionInfoLines[0], ":")
	deviceFullSizeInBytes, err := strconv.ParseUint(strings.TrimRight(deviceInfo[1], "B"), 10, 64)
	if err != nil {
		return 0, bosherr.WrapErrorf(err, "Getting remaining size of `%s'", devicePath)
	}

	firstPartitionInfo := strings.Split(partitionInfoLines[1], ":")
	firstPartitionEndInBytes, err := strconv.ParseUint(strings.TrimRight(firstPartitionInfo[2], "B"), 10, 64)
	if err != nil {
		return 0, bosherr.WrapErrorf(err, "Getting remaining size of `%s'", devicePath)
	}

	remainingSizeInBytes := deviceFullSizeInBytes - firstPartitionEndInBytes - 1

	return remainingSizeInBytes, nil
}

func (p Provider) Get(name string) (supervisor JobSupervisor, err error) {
	supervisor, found := p.supervisors[name]
	if !found {
		err = bosherr.Errorf("JobSupervisor %s could not be found", name)
	}
	return
}

func (a UnmountDiskAction) Run(diskID string) (value interface{}, err error) {
	settings := a.settingsService.GetSettings()

	diskSettings, found := settings.PersistentDiskSettings(diskID)
	if !found {
		err = bosherr.Errorf("Persistent disk with volume id '%s' could not be found", diskID)
		return
	}

	didUnmount, err := a.platform.UnmountPersistentDisk(diskSettings)
	if err != nil {
		err = bosherr.WrapError(err, "Unmounting persistent disk")
		return
	}

	msg := fmt.Sprintf("Partition of %s is not mounted", diskSettings.Path)

	if didUnmount {
		msg = fmt.Sprintf("Unmounted partition of %s", diskSettings.Path)
	}

	type valueType struct {
		Message string `json:"message"`
	}

	value = valueType{Message: msg}
	return
}

func (idpr idDevicePathResolver) GetRealDevicePath(diskSettings boshsettings.DiskSettings) (string, bool, error) {
	if diskSettings.ID == "" {
		return "", false, bosherr.Errorf("Disk ID is not set")
	}

	if len(diskSettings.ID) < 20 {
		return "", false, bosherr.Errorf("Disk ID is not the correct format")
	}

	err := idpr.udev.Trigger()
	if err != nil {
		return "", false, bosherr.WrapError(err, "Running udevadm trigger")
	}

	err = idpr.udev.Settle()
	if err != nil {
		return "", false, bosherr.WrapError(err, "Running udevadm settle")
	}

	stopAfter := time.Now().Add(idpr.diskWaitTimeout)
	found := false

	var realPath string

	diskID := diskSettings.ID[0:20]

	for !found {
		if time.Now().After(stopAfter) {
			return "", true, bosherr.Errorf("Timed out getting real device path for '%s'", diskID)
		}

		time.Sleep(100 * time.Millisecond)

		deviceIDPath := filepath.Join(string(os.PathSeparator), "dev", "disk", "by-id", fmt.Sprintf("virtio-%s", diskID))

		realPath, err = idpr.fs.ReadLink(deviceIDPath)
		if err != nil {
			continue
		}

		if idpr.fs.FileExists(realPath) {
			found = true
		}
	}

	return realPath, false, nil
}

func (a CancelTaskAction) Run(taskID string) (string, error) {
	task, found := a.taskService.FindTaskWithID(taskID)
	if !found {
		return "", bosherr.Errorf("Task with id %s could not be found", taskID)
	}

	return "canceled", task.Cancel()
}