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driver.go
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driver.go
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package overlayxfs
import (
"bytes"
"fmt"
"io/ioutil"
"os"
"os/exec"
"path"
"path/filepath"
"strconv"
"strings"
"syscall"
"code.cloudfoundry.org/grootfs/groot"
"code.cloudfoundry.org/grootfs/store"
"code.cloudfoundry.org/grootfs/store/filesystems"
quotapkg "code.cloudfoundry.org/grootfs/store/filesystems/overlayxfs/quota"
"code.cloudfoundry.org/grootfs/store/image_cloner"
"code.cloudfoundry.org/lager"
errorspkg "github.com/pkg/errors"
)
const (
BaseFileSystemName = "xfs"
UpperDir = "diff"
WorkDir = "workdir"
RootfsDir = "rootfs"
imageInfoName = "image_info"
)
func NewDriver(storePath string) (*Driver, error) {
if err := filesystems.CheckFSPath(storePath, filesystems.XfsType, BaseFileSystemName); err != nil {
return nil, err
}
return &Driver{
storePath: storePath,
}, nil
}
type Driver struct {
storePath string
}
func (d *Driver) VolumePath(logger lager.Logger, id string) (string, error) {
volPath := filepath.Join(d.storePath, store.VolumesDirName, id)
_, err := os.Stat(volPath)
if err == nil {
return volPath, nil
}
return "", errorspkg.Wrapf(err, "volume does not exist `%s`", id)
}
func (d *Driver) CreateVolume(logger lager.Logger, parentID string, id string) (string, error) {
logger = logger.Session("overlayxfs-creating-volume", lager.Data{"parentID": parentID, "id": id})
logger.Info("starting")
defer logger.Info("ending")
volumePath := filepath.Join(d.storePath, store.VolumesDirName, id)
if err := os.Mkdir(volumePath, 0755); err != nil {
logger.Error("creating-volume-dir-failed", err)
return "", errorspkg.Wrap(err, "creating volume")
}
if err := os.Chmod(volumePath, 755); err != nil {
logger.Error("changing-volume-permissions-failed", err)
return "", errorspkg.Wrap(err, "changing volume permissions")
}
return volumePath, nil
}
func (d *Driver) DestroyVolume(logger lager.Logger, id string) error {
volumePath := filepath.Join(d.storePath, "volumes", id)
if err := os.RemoveAll(volumePath); err != nil {
logger.Error(fmt.Sprintf("failed to destroy volume %s", volumePath), err)
return errorspkg.Wrapf(err, "destroying volume (%s)", id)
}
return nil
}
func (d *Driver) Volumes(logger lager.Logger) ([]string, error) {
volumes := []string{}
existingVolumes, err := ioutil.ReadDir(path.Join(d.storePath, store.VolumesDirName))
if err != nil {
return nil, errorspkg.Wrap(err, "failed to list volumes")
}
for _, volumeInfo := range existingVolumes {
volumes = append(volumes, volumeInfo.Name())
}
return volumes, nil
}
func (d *Driver) CreateImage(logger lager.Logger, spec image_cloner.ImageDriverSpec) error {
logger = logger.Session("overlayxfs-creating-image", lager.Data{"spec": spec})
logger.Info("starting")
defer logger.Info("ending")
if _, err := os.Stat(spec.ImagePath); os.IsNotExist(err) {
logger.Error("image-path-not-found", err)
return errorspkg.Wrap(err, "image path does not exist")
}
baseVolumePaths := []string{}
var baseVolumeSize int64
for i := len(spec.BaseVolumeIDs) - 1; i >= 0; i-- {
volumePath := filepath.Join(d.storePath, store.VolumesDirName, spec.BaseVolumeIDs[i])
if _, err := os.Stat(volumePath); os.IsNotExist(err) {
logger.Error("base-volume-path-not-found", err)
return errorspkg.Wrap(err, "base volume path does not exist")
}
volumeSize, err := d.duUsage(logger, volumePath)
if err != nil {
logger.Error("calculating-base-volume-size-failed", err)
return errorspkg.Wrapf(err, "calculating base volume size %s", volumePath)
}
baseVolumeSize += volumeSize
baseVolumePaths = append(baseVolumePaths, volumePath)
}
upperDir := filepath.Join(spec.ImagePath, UpperDir)
workDir := filepath.Join(spec.ImagePath, WorkDir)
rootfsDir := filepath.Join(spec.ImagePath, RootfsDir)
if err := d.applyDiskLimit(logger, spec, baseVolumeSize); err != nil {
return errorspkg.Wrap(err, "applying disk limits")
}
if err := os.Mkdir(upperDir, 0755); err != nil {
logger.Error("creating-upperdir-folder-failed", err)
return errorspkg.Wrap(err, "creating upperdir folder")
}
if err := os.Mkdir(workDir, 0755); err != nil {
logger.Error("creating-workdir-folder-failed", err)
return errorspkg.Wrap(err, "creating workdir folder")
}
if err := os.Mkdir(rootfsDir, 0755); err != nil {
logger.Error("creating-rootfs-folder-failed", err)
return errorspkg.Wrap(err, "creating rootfs folder")
}
mountData := fmt.Sprintf("lowerdir=%s,upperdir=%s,workdir=%s", strings.Join(baseVolumePaths, ":"), upperDir, workDir)
if err := syscall.Mount("overlay", rootfsDir, "overlay", 0, mountData); err != nil {
logger.Error("mounting-overlay-to-rootfs-failed", err, lager.Data{"mountData": mountData, "rootfsDir": rootfsDir})
return errorspkg.Wrap(err, "mounting overlay")
}
imageInfoFileName := filepath.Join(spec.ImagePath, imageInfoName)
if err := ioutil.WriteFile(imageInfoFileName, []byte(strconv.FormatInt(baseVolumeSize, 10)), 0600); err != nil {
return errorspkg.Wrapf(err, "writing image info %s", imageInfoFileName)
}
return nil
}
func (d *Driver) DestroyImage(logger lager.Logger, imagePath string) error {
logger = logger.Session("overlayxfs-destroying-image", lager.Data{"imagePath": imagePath})
logger.Info("starting")
defer logger.Info("ending")
if err := syscall.Unmount(filepath.Join(imagePath, RootfsDir), 0); err != nil {
logger.Error("unmounting-rootfs-folder-failed", err)
return errorspkg.Wrap(err, "unmounting rootfs folder")
}
if err := os.Remove(filepath.Join(imagePath, RootfsDir)); err != nil {
logger.Error("removing-rootfs-folder-failed", err)
return errorspkg.Wrap(err, "deleting rootfs folder")
}
if err := os.RemoveAll(filepath.Join(imagePath, WorkDir)); err != nil {
logger.Error("removing-workdir-folder-failed", err)
return errorspkg.Wrap(err, "deleting workdir folder")
}
if err := os.RemoveAll(filepath.Join(imagePath, UpperDir)); err != nil {
logger.Error("removing-upperdir-folder-failed", err)
return errorspkg.Wrap(err, "deleting upperdir folder")
}
return nil
}
func (d *Driver) applyDiskLimit(logger lager.Logger, spec image_cloner.ImageDriverSpec, volumeSize int64) error {
logger = logger.Session("applying-quotas", lager.Data{"spec": spec})
logger.Debug("starting")
defer logger.Debug("ending")
if spec.DiskLimit == 0 {
logger.Info("no-need-for-quotas")
return nil
}
diskLimit := spec.DiskLimit
if spec.ExclusiveDiskLimit {
logger.Info("applying-exclusive-quotas")
} else {
logger.Info("applying-inclusive-quotas")
diskLimit -= volumeSize
if diskLimit < 0 {
err := errorspkg.New("disk limit is smaller than volume size")
logger.Error("applying-inclusive-quota-failed", err, lager.Data{"imagePath": spec.ImagePath})
return err
}
}
imagesPath := filepath.Join(d.storePath, store.ImageDirName)
quotaControl, err := quotapkg.NewControl(imagesPath)
if err != nil {
logger.Error("creating-quota-control-failed", err, lager.Data{"imagesPath": imagesPath})
return errorspkg.Wrapf(err, "creating xfs quota control %s", imagesPath)
}
quota := quotapkg.Quota{
Size: uint64(diskLimit),
}
if err := quotaControl.SetQuota(spec.ImagePath, quota); err != nil {
logger.Error("setting-quota-failed", err)
return errorspkg.Wrapf(err, "setting quota to %s", spec.ImagePath)
}
return nil
}
func (d *Driver) FetchStats(logger lager.Logger, imagePath string) (groot.VolumeStats, error) {
logger = logger.Session("overlayxfs-fetching-stats", lager.Data{"imagePath": imagePath})
logger.Info("starting")
defer logger.Info("ending")
if _, err := os.Stat(imagePath); os.IsNotExist(err) {
logger.Error("image-path-not-found", err)
return groot.VolumeStats{}, errorspkg.Wrapf(err, "image path (%s) doesn't exist", imagePath)
}
projectID, err := quotapkg.GetProjectID(imagePath)
if err != nil {
logger.Error("fetching-project-id-failed", err)
return groot.VolumeStats{}, errorspkg.Wrapf(err, "fetching project id for %s", imagePath)
}
var exclusiveSize int64
if projectID != 0 {
exclusiveSize, err = d.listQuotaUsage(logger, imagePath)
if err != nil {
logger.Error("list-quota-usage-failed", err, lager.Data{"projectID": projectID})
return groot.VolumeStats{}, errorspkg.Wrapf(err, "listing quota usage %s", imagePath)
}
}
volumeSize, err := d.readImageInfo(logger, imagePath)
if err != nil {
logger.Error("reading-image-info-failed", err)
return groot.VolumeStats{}, errorspkg.Wrapf(err, "reading image info %s", imagePath)
}
logger.Debug("usage", lager.Data{"volumeSize": volumeSize, "exclusiveSize": exclusiveSize})
return groot.VolumeStats{
DiskUsage: groot.DiskUsage{
ExclusiveBytesUsed: exclusiveSize,
TotalBytesUsed: volumeSize + exclusiveSize,
},
}, nil
}
func (d *Driver) listQuotaUsage(logger lager.Logger, imagePath string) (int64, error) {
logger = logger.Session("listing-quota-usage", lager.Data{"imagePath": imagePath})
logger.Debug("starting")
defer logger.Debug("ending")
imagesPath := filepath.Join(d.storePath, store.ImageDirName)
quotaControl, err := quotapkg.NewControl(imagesPath)
if err != nil {
logger.Error("creating-quota-control-failed", err)
return 0, errorspkg.Wrapf(err, "creating quota control")
}
var quota quotapkg.Quota
if err := quotaControl.GetQuota(imagePath, "a); err != nil {
logger.Error("getting-quota-failed", err)
return 0, errorspkg.Wrapf(err, "getting quota %s", imagePath)
}
return int64(quota.BCount), nil
}
func (d *Driver) duUsage(logger lager.Logger, path string) (int64, error) {
logger = logger.Session("du-metrics", lager.Data{"path": path})
logger.Debug("starting")
defer logger.Debug("ending")
cmd := exec.Command("du", "-bs", path)
stdoutBuffer := bytes.NewBuffer([]byte{})
stderrBuffer := bytes.NewBuffer([]byte{})
cmd.Stdout = stdoutBuffer
cmd.Stderr = stdoutBuffer
if err := cmd.Run(); err != nil {
logger.Error("du-command-failed", err, lager.Data{"stdout": stdoutBuffer.String(), "stderr": stderrBuffer.String()})
return 0, errorspkg.Wrapf(err, "du failed: %s", stderrBuffer.String())
}
usageString := strings.Split(stdoutBuffer.String(), "\t")[0]
return strconv.ParseInt(usageString, 10, 64)
}
func (d *Driver) readImageInfo(logger lager.Logger, imagePath string) (int64, error) {
contents, err := ioutil.ReadFile(filepath.Join(imagePath, imageInfoName))
if err != nil {
return 0, err
}
return strconv.ParseInt(string(contents), 10, 64)
}