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manager.go
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manager.go
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package manager
import (
"errors"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"code.cloudfoundry.org/lager"
"github.com/SUSE/groot-btrfs/base_image_puller"
"github.com/SUSE/groot-btrfs/groot"
"github.com/SUSE/groot-btrfs/store"
"github.com/SUSE/groot-btrfs/store/image_cloner"
errorspkg "github.com/pkg/errors"
)
const MinStoreSizeBytes = 1024 * 1024 * 200
//go:generate counterfeiter . StoreDriver
type StoreDriver interface {
ConfigureStore(logger lager.Logger, storePath string, ownerUID, ownerGID int) error
ValidateFileSystem(logger lager.Logger, path string) error
InitFilesystem(logger lager.Logger, filesystemPath, storePath string) error
}
type Manager struct {
storePath string
imageDriver image_cloner.ImageDriver
volumeDriver base_image_puller.VolumeDriver
storeDriver StoreDriver
storeNamespacer StoreNamespacer
}
//go:generate counterfeiter . StoreNamespacer
type StoreNamespacer interface {
ApplyMappings(uidMappings, gidMappings []groot.IDMappingSpec) error
}
type InitSpec struct {
UIDMappings []groot.IDMappingSpec
GIDMappings []groot.IDMappingSpec
StoreSizeBytes int64
}
func New(storePath string, storeNamespacer StoreNamespacer, volumeDriver base_image_puller.VolumeDriver, imageDriver image_cloner.ImageDriver, storeDriver StoreDriver) *Manager {
return &Manager{
storePath: storePath,
volumeDriver: volumeDriver,
imageDriver: imageDriver,
storeDriver: storeDriver,
storeNamespacer: storeNamespacer,
}
}
func (m *Manager) InitStore(logger lager.Logger, spec InitSpec) error {
logger = logger.Session("store-manager-init-store", lager.Data{"storePath": m.storePath, "spec": spec})
logger.Debug("starting")
defer logger.Debug("ending")
validationPath := filepath.Dir(m.storePath)
stat, err := os.Stat(m.storePath)
if err == nil && stat.IsDir() {
logger.Debug("store-path-already-exists", lager.Data{"StorePath": m.storePath})
validationPath = m.storePath
}
if spec.StoreSizeBytes > 0 {
validationPath = m.storePath
}
if err := m.storeDriver.ValidateFileSystem(logger, validationPath); err != nil {
logger.Debug(errorspkg.Wrap(err, "store-could-not-be-validated").Error())
if spec.StoreSizeBytes <= 0 {
return errorspkg.Wrap(err, "validating store path filesystem")
}
if err := m.createAndMountFilesystem(logger, spec.StoreSizeBytes); err != nil {
return err
}
} else {
logger.Debug("store-already-initialized")
}
if err := os.MkdirAll(filepath.Join(m.storePath, store.MetaDirName), 0755); err != nil {
logger.Error("init-store-failed", err)
return errorspkg.Wrap(err, "initializing store")
}
err = m.storeNamespacer.ApplyMappings(spec.UIDMappings, spec.GIDMappings)
if err != nil {
logger.Error("applying-namespace-mappings-failed", err)
return err
}
ownerUID, ownerGID := m.findStoreOwner(spec.UIDMappings, spec.GIDMappings)
if err := os.Chown(m.storePath, ownerUID, ownerGID); err != nil {
logger.Error("chowning-store-path-failed", err, lager.Data{"uid": ownerUID, "gid": ownerGID})
return errorspkg.Wrap(err, "chowing store")
}
if err := m.configureStore(logger, ownerUID, ownerGID); err != nil {
logger.Error("store-filesystem-specific-configuration-failed", err)
return errorspkg.Wrap(err, "running filesystem-specific configuration")
}
return nil
}
func (m *Manager) IsStoreInitialized(logger lager.Logger) bool {
for _, folderName := range store.StoreFolders {
if _, err := os.Stat(filepath.Join(m.storePath, folderName)); os.IsNotExist(err) {
return false
}
}
if _, err := os.Stat(filepath.Join(m.storePath, store.MetaDirName, groot.NamespaceFilename)); os.IsNotExist(err) {
return false
}
return true
}
func (m *Manager) configureStore(logger lager.Logger, ownerUID, ownerGID int) error {
logger = logger.Session("store-manager-configure-store", lager.Data{"storePath": m.storePath, "ownerUID": ownerUID, "ownerGID": ownerGID})
logger.Debug("starting")
defer logger.Debug("ending")
if err := isDirectory(m.storePath); err != nil {
return err
}
if err := os.Chown(m.storePath, ownerUID, ownerGID); err != nil {
logger.Error("store-ownership-change-failed", err, lager.Data{"target-uid": ownerUID, "target-gid": ownerGID})
return errorspkg.Wrapf(err, "changing store owner to %d:%d for path %s", ownerUID, ownerGID, m.storePath)
}
if err := os.Chmod(m.storePath, 0700); err != nil {
logger.Error("store-permission-change-failed", err)
return errorspkg.Wrapf(err, "changing store permissions %s", m.storePath)
}
for _, folderName := range store.StoreFolders {
if err := m.createInternalDirectory(logger, folderName, ownerUID, ownerGID); err != nil {
return err
}
}
if err := m.storeDriver.ConfigureStore(logger, m.storePath, ownerUID, ownerGID); err != nil {
logger.Error("store-filesystem-specific-configuration-failed", err)
return errorspkg.Wrap(err, "running filesystem-specific configuration")
}
return nil
}
func (m *Manager) DeleteStore(logger lager.Logger, locksmith groot.Locksmith) error {
logger = logger.Session("store-manager-delete-store")
logger.Debug("starting")
defer logger.Debug("ending")
if _, err := os.Stat(m.storePath); os.IsNotExist(err) {
logger.Info("store-not-found", lager.Data{"storePath": m.storePath})
return nil
}
fileLock, err := locksmith.Lock(groot.GlobalLockKey)
if err != nil {
logger.Error("locking-failed", err)
return errorspkg.Wrap(err, "failed to lock - refusing to delete possibly corrupted store")
}
defer locksmith.Unlock(fileLock)
existingImages, err := m.images()
if err != nil {
return err
}
for _, image := range existingImages {
if err := m.imageDriver.DestroyImage(logger, image); err != nil {
logger.Error("destroying-image-failed", err, lager.Data{"image": image})
return errorspkg.Wrapf(err, "destroying image %s", image)
}
}
existingVolumes, err := m.volumes()
if err != nil {
return err
}
for _, volume := range existingVolumes {
if err := m.volumeDriver.DestroyVolume(logger, volume); err != nil {
logger.Error("destroying-volume-failed", err, lager.Data{"volume": volume})
return errorspkg.Wrapf(err, "destroying volume %s", volume)
}
}
if err := os.RemoveAll(m.storePath); err != nil {
logger.Error("deleting-store-path-failed", err, lager.Data{"storePath": m.storePath})
return errorspkg.Wrapf(err, "deleting store path")
}
return nil
}
func (m *Manager) createAndMountFilesystem(logger lager.Logger, storeSizeBytes int64) error {
if storeSizeBytes < MinStoreSizeBytes {
logger.Error("init-store-failed", errors.New("store size must be at least 200Mb"), lager.Data{"storeSize": storeSizeBytes})
return errorspkg.New("store size must be at least 200Mb")
}
backingStoreFile := fmt.Sprintf("%s.backing-store", m.storePath)
if _, err := os.Stat(backingStoreFile); os.IsNotExist(err) {
if err := ioutil.WriteFile(backingStoreFile, []byte{}, 0600); err != nil {
logger.Error("writing-backing-store-file", err, lager.Data{"backingstoreFile": backingStoreFile})
return errorspkg.Wrap(err, "creating backing store file")
}
}
if err := os.Truncate(backingStoreFile, storeSizeBytes); err != nil {
logger.Error("truncating-backing-store-file-failed", err, lager.Data{"backingstoreFile": backingStoreFile, "size": storeSizeBytes})
return errorspkg.Wrap(err, "truncating backing store file")
}
if err := os.MkdirAll(m.storePath, 0755); err != nil {
logger.Error("init-store-failed", err)
return errorspkg.Wrap(err, "initializing store")
}
if err := m.storeDriver.InitFilesystem(logger, backingStoreFile, m.storePath); err != nil {
logger.Error("initializing-filesystem-failed", err, lager.Data{"backingstoreFile": backingStoreFile})
return errorspkg.Wrap(err, "initializing filesyztem")
}
return nil
}
func (m *Manager) images() ([]string, error) {
imagesPath := filepath.Join(m.storePath, store.ImageDirName)
images, err := ioutil.ReadDir(imagesPath)
if err != nil {
return nil, errorspkg.Wrap(err, "listing images")
}
imagePaths := []string{}
for _, file := range images {
imagePaths = append(imagePaths, filepath.Join(imagesPath, file.Name()))
}
return imagePaths, nil
}
func (m *Manager) volumes() ([]string, error) {
volumesPath := filepath.Join(m.storePath, store.VolumesDirName)
volumes, err := ioutil.ReadDir(volumesPath)
if err != nil {
return nil, errorspkg.Wrap(err, "listing volumes")
}
volumeIds := []string{}
for _, file := range volumes {
volumeIds = append(volumeIds, file.Name())
}
return volumeIds, nil
}
func (m *Manager) createInternalDirectory(logger lager.Logger, folderName string, ownerUID, ownerGID int) error {
requiredPath := filepath.Join(m.storePath, folderName)
if err := isDirectory(requiredPath); err != nil {
return err
}
if err := os.Mkdir(requiredPath, 0755); err != nil {
dir, err1 := os.Lstat(requiredPath)
if err1 != nil || !dir.IsDir() {
return errorspkg.Wrapf(err, "making directory `%s`", requiredPath)
}
}
if err := os.Chown(requiredPath, ownerUID, ownerGID); err != nil {
logger.Error("store-ownership-change-failed", err, lager.Data{"target-uid": ownerUID, "target-gid": ownerGID})
return errorspkg.Wrapf(err, "changing store owner to %d:%d for path %s", ownerUID, ownerGID, requiredPath)
}
return nil
}
func (m *Manager) findStoreOwner(uidMappings, gidMappings []groot.IDMappingSpec) (int, int) {
uid := os.Getuid()
gid := os.Getgid()
for _, mapping := range uidMappings {
if mapping.Size == 1 && mapping.NamespaceID == 0 {
uid = mapping.HostID
break
}
uid = -1
}
for _, mapping := range gidMappings {
if mapping.Size == 1 && mapping.NamespaceID == 0 {
gid = mapping.HostID
break
}
gid = -1
}
return uid, gid
}
func isDirectory(requiredPath string) error {
if info, err := os.Stat(requiredPath); err == nil {
if !info.IsDir() {
return errorspkg.Errorf("path `%s` is not a directory", requiredPath)
}
}
return nil
}