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storage_volumes_utils.go
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storage_volumes_utils.go
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package main
import (
"database/sql"
"fmt"
"path/filepath"
"strings"
"github.com/lxc/lxd/shared"
"github.com/lxc/lxd/shared/version"
)
const (
storagePoolVolumeTypeContainer = iota
storagePoolVolumeTypeImage
storagePoolVolumeTypeCustom
)
// Leave the string type in here! This guarantees that go treats this is as a
// typed string constant. Removing it causes go to treat these as untyped string
// constants which is not what we want.
const (
storagePoolVolumeTypeNameContainer string = "container"
storagePoolVolumeTypeNameImage string = "image"
storagePoolVolumeTypeNameCustom string = "custom"
)
// Leave the string type in here! This guarantees that go treats this is as a
// typed string constant. Removing it causes go to treat these as untyped string
// constants which is not what we want.
const (
storagePoolVolumeAPIEndpointContainers string = "containers"
storagePoolVolumeAPIEndpointImages string = "images"
storagePoolVolumeAPIEndpointCustom string = "custom"
)
var supportedVolumeTypes = []int{storagePoolVolumeTypeContainer, storagePoolVolumeTypeImage, storagePoolVolumeTypeCustom}
func storagePoolVolumeTypeNameToType(volumeTypeName string) (int, error) {
switch volumeTypeName {
case storagePoolVolumeTypeNameContainer:
return storagePoolVolumeTypeContainer, nil
case storagePoolVolumeTypeNameImage:
return storagePoolVolumeTypeImage, nil
case storagePoolVolumeTypeNameCustom:
return storagePoolVolumeTypeCustom, nil
}
return -1, fmt.Errorf("invalid storage volume type name")
}
func storagePoolVolumeTypeNameToAPIEndpoint(volumeTypeName string) (string, error) {
switch volumeTypeName {
case storagePoolVolumeTypeNameContainer:
return storagePoolVolumeAPIEndpointContainers, nil
case storagePoolVolumeTypeNameImage:
return storagePoolVolumeAPIEndpointImages, nil
case storagePoolVolumeTypeNameCustom:
return storagePoolVolumeAPIEndpointCustom, nil
}
return "", fmt.Errorf("invalid storage volume type name")
}
func storagePoolVolumeTypeToName(volumeType int) (string, error) {
switch volumeType {
case storagePoolVolumeTypeContainer:
return storagePoolVolumeTypeNameContainer, nil
case storagePoolVolumeTypeImage:
return storagePoolVolumeTypeNameImage, nil
case storagePoolVolumeTypeCustom:
return storagePoolVolumeTypeNameCustom, nil
}
return "", fmt.Errorf("invalid storage volume type")
}
func storagePoolVolumeTypeToAPIEndpoint(volumeType int) (string, error) {
switch volumeType {
case storagePoolVolumeTypeContainer:
return storagePoolVolumeAPIEndpointContainers, nil
case storagePoolVolumeTypeImage:
return storagePoolVolumeAPIEndpointImages, nil
case storagePoolVolumeTypeCustom:
return storagePoolVolumeAPIEndpointCustom, nil
}
return "", fmt.Errorf("invalid storage volume type")
}
func storagePoolVolumeUpdate(d *Daemon, poolName string, volumeName string, volumeType int, newDescription string, newConfig map[string]string) error {
s, err := storagePoolVolumeInit(d, poolName, volumeName, volumeType)
if err != nil {
return err
}
oldWritable := s.GetStoragePoolVolumeWritable()
newWritable := oldWritable
// Backup the current state
oldDescription := oldWritable.Description
oldConfig := map[string]string{}
err = shared.DeepCopy(&oldWritable.Config, &oldConfig)
if err != nil {
return err
}
// Define a function which reverts everything. Defer this function
// so that it doesn't need to be explicitly called in every failing
// return path. Track whether or not we want to undo the changes
// using a closure.
undoChanges := true
defer func() {
if undoChanges {
s.SetStoragePoolVolumeWritable(&oldWritable)
}
}()
// Diff the configurations
changedConfig := []string{}
userOnly := true
for key := range oldConfig {
if oldConfig[key] != newConfig[key] {
if !strings.HasPrefix(key, "user.") {
userOnly = false
}
if !shared.StringInSlice(key, changedConfig) {
changedConfig = append(changedConfig, key)
}
}
}
for key := range newConfig {
if oldConfig[key] != newConfig[key] {
if !strings.HasPrefix(key, "user.") {
userOnly = false
}
if !shared.StringInSlice(key, changedConfig) {
changedConfig = append(changedConfig, key)
}
}
}
// Apply config changes if there are any
if len(changedConfig) != 0 {
// Update the storage pool
if !userOnly {
err = s.StoragePoolVolumeUpdate(changedConfig)
if err != nil {
return err
}
}
newWritable.Config = newConfig
// Apply the new configuration
s.SetStoragePoolVolumeWritable(&newWritable)
}
poolID, err := dbStoragePoolGetID(d.db, poolName)
if err != nil {
return err
}
// Update the database if something changed
if len(changedConfig) != 0 || newDescription != oldDescription {
err = dbStoragePoolVolumeUpdate(d.db, volumeName, volumeType, poolID, newDescription, newConfig)
if err != nil {
return err
}
}
// Success, update the closure to mark that the changes should be kept.
undoChanges = false
return nil
}
func storagePoolVolumeUsedByGet(d *Daemon, volumeName string, volumeTypeName string) ([]string, error) {
// Look for containers using the interface
cts, err := dbContainersList(d.db, cTypeRegular)
if err != nil {
return []string{}, err
}
volumeUsedBy := []string{}
volumeNameWithType := fmt.Sprintf("%s/%s", volumeTypeName, volumeName)
for _, ct := range cts {
c, err := containerLoadByName(d, ct)
if err != nil {
continue
}
for _, d := range c.LocalDevices() {
if d["type"] != "disk" {
continue
}
// Make sure that we don't compare against stuff like
// "container////bla" but only against "container/bla".
cleanSource := filepath.Clean(d["source"])
if cleanSource == volumeName || cleanSource == volumeNameWithType {
volumeUsedBy = append(volumeUsedBy, fmt.Sprintf("/%s/containers/%s", version.APIVersion, ct))
}
}
}
profiles, err := profilesUsingPoolVolumeGetNames(d.db, volumeName, volumeTypeName)
if err != nil {
return []string{}, err
}
if len(volumeUsedBy) == 0 && len(profiles) == 0 {
return []string{}, err
}
for _, pName := range profiles {
volumeUsedBy = append(volumeUsedBy, fmt.Sprintf("/%s/profiles/%s", version.APIVersion, pName))
}
return volumeUsedBy, nil
}
func profilesUsingPoolVolumeGetNames(db *sql.DB, volumeName string, volumeType string) ([]string, error) {
usedBy := []string{}
profiles, err := dbProfiles(db)
if err != nil {
return usedBy, err
}
for _, pName := range profiles {
_, profile, err := dbProfileGet(db, pName)
if err != nil {
return usedBy, err
}
volumeNameWithType := fmt.Sprintf("%s/%s", volumeType, volumeName)
for _, v := range profile.Devices {
if v["type"] != "disk" {
continue
}
// Can't be a storage volume.
if filepath.IsAbs(v["source"]) {
continue
}
// Make sure that we don't compare against stuff
// like "container////bla" but only against
// "container/bla".
cleanSource := filepath.Clean(v["source"])
if cleanSource == volumeName || cleanSource == volumeNameWithType {
usedBy = append(usedBy, pName)
}
}
}
return usedBy, nil
}
func storagePoolVolumeDBCreate(d *Daemon, poolName string, volumeName, volumeDescription string, volumeTypeName string, volumeConfig map[string]string) error {
// Check that the name of the new storage volume is valid. (For example.
// zfs pools cannot contain "/" in their names.)
err := storageValidName(volumeName)
if err != nil {
return err
}
// Convert the volume type name to our internal integer representation.
volumeType, err := storagePoolVolumeTypeNameToType(volumeTypeName)
if err != nil {
return err
}
// We currently only allow to create storage volumes of type
// storagePoolVolumeTypeCustom. So check, that nothing else was
// requested.
if volumeType != storagePoolVolumeTypeCustom {
return fmt.Errorf("currently not allowed to create storage volumes of type %s", volumeTypeName)
}
// Load storage pool the volume will be attached to.
poolID, poolStruct, err := dbStoragePoolGet(d.db, poolName)
if err != nil {
return err
}
// Check that a storage volume of the same storage volume type does not
// already exist.
volumeID, _ := dbStoragePoolVolumeGetTypeID(d.db, volumeName, volumeType, poolID)
if volumeID > 0 {
return fmt.Errorf("a storage volume of type %s does already exist", volumeTypeName)
}
// Make sure that we don't pass a nil to the next function.
if volumeConfig == nil {
volumeConfig = map[string]string{}
}
// Validate the requested storage volume configuration.
err = storageVolumeValidateConfig(poolName, volumeConfig, poolStruct)
if err != nil {
return err
}
err = storageVolumeFillDefault(poolName, volumeConfig, poolStruct)
if err != nil {
return err
}
// Create the database entry for the storage volume.
_, err = dbStoragePoolVolumeCreate(d.db, volumeName, volumeDescription, volumeType, poolID, volumeConfig)
if err != nil {
return fmt.Errorf("Error inserting %s of type %s into database: %s", poolName, volumeTypeName, err)
}
return nil
}
func storagePoolVolumeCreateInternal(d *Daemon, poolName string, volumeName, volumeDescription string, volumeTypeName string, volumeConfig map[string]string) error {
err := storagePoolVolumeDBCreate(d, poolName, volumeName, volumeDescription, volumeTypeName, volumeConfig)
if err != nil {
return err
}
// Convert the volume type name to our internal integer representation.
volumeType, err := storagePoolVolumeTypeNameToType(volumeTypeName)
if err != nil {
return err
}
s, err := storagePoolVolumeInit(d, poolName, volumeName, volumeType)
if err != nil {
return err
}
poolID, _ := s.GetContainerPoolInfo()
// Create storage volume.
err = s.StoragePoolVolumeCreate()
if err != nil {
dbStoragePoolVolumeDelete(d.db, volumeName, volumeType, poolID)
return err
}
return nil
}