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device_setup.go
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device_setup.go
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package devmapper
import (
"bufio"
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"reflect"
"strings"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
type directLVMConfig struct {
Device string
ThinpPercent uint64
ThinpMetaPercent uint64
AutoExtendPercent uint64
AutoExtendThreshold uint64
}
var (
errThinpPercentMissing = errors.New("must set both `dm.thinp_percent` and `dm.thinp_metapercent` if either is specified")
errThinpPercentTooBig = errors.New("combined `dm.thinp_percent` and `dm.thinp_metapercent` must not be greater than 100")
errMissingSetupDevice = errors.New("must provide device path in `dm.setup_device` in order to configure direct-lvm")
)
func validateLVMConfig(cfg directLVMConfig) error {
if reflect.DeepEqual(cfg, directLVMConfig{}) {
return nil
}
if cfg.Device == "" {
return errMissingSetupDevice
}
if (cfg.ThinpPercent > 0 && cfg.ThinpMetaPercent == 0) || cfg.ThinpMetaPercent > 0 && cfg.ThinpPercent == 0 {
return errThinpPercentMissing
}
if cfg.ThinpPercent+cfg.ThinpMetaPercent > 100 {
return errThinpPercentTooBig
}
return nil
}
func checkDevAvailable(dev string) error {
lvmScan, err := exec.LookPath("lvmdiskscan")
if err != nil {
logrus.Debug("could not find lvmdiskscan")
return nil
}
out, err := exec.Command(lvmScan).CombinedOutput()
if err != nil {
logrus.WithError(err).Error(string(out))
return nil
}
if !bytes.Contains(out, []byte(dev)) {
return errors.Errorf("%s is not available for use with devicemapper", dev)
}
return nil
}
func checkDevInVG(dev string) error {
pvDisplay, err := exec.LookPath("pvdisplay")
if err != nil {
logrus.Debug("could not find pvdisplay")
return nil
}
out, err := exec.Command(pvDisplay, dev).CombinedOutput()
if err != nil {
logrus.WithError(err).Error(string(out))
return nil
}
scanner := bufio.NewScanner(bytes.NewReader(bytes.TrimSpace(out)))
for scanner.Scan() {
fields := strings.SplitAfter(strings.TrimSpace(scanner.Text()), "VG Name")
if len(fields) > 1 {
// got "VG Name" line"
vg := strings.TrimSpace(fields[1])
if len(vg) > 0 {
return errors.Errorf("%s is already part of a volume group %q: must remove this device from any volume group or provide a different device", dev, vg)
}
logrus.Error(fields)
break
}
}
return nil
}
func checkDevHasFS(dev string) error {
blkid, err := exec.LookPath("blkid")
if err != nil {
logrus.Debug("could not find blkid")
return nil
}
out, err := exec.Command(blkid, dev).CombinedOutput()
if err != nil {
logrus.WithError(err).Error(string(out))
return nil
}
fields := bytes.Fields(out)
for _, f := range fields {
kv := bytes.Split(f, []byte{'='})
if bytes.Equal(kv[0], []byte("TYPE")) {
v := bytes.Trim(kv[1], "\"")
if len(v) > 0 {
return errors.Errorf("%s has a filesystem already, use dm.directlvm_device_force=true if you want to wipe the device", dev)
}
return nil
}
}
return nil
}
func verifyBlockDevice(dev string, force bool) error {
if err := checkDevAvailable(dev); err != nil {
return err
}
if err := checkDevInVG(dev); err != nil {
return err
}
if force {
return nil
}
if err := checkDevHasFS(dev); err != nil {
return err
}
return nil
}
func readLVMConfig(root string) (directLVMConfig, error) {
var cfg directLVMConfig
p := filepath.Join(root, "setup-config.json")
b, err := ioutil.ReadFile(p)
if err != nil {
if os.IsNotExist(err) {
return cfg, nil
}
return cfg, errors.Wrap(err, "error reading existing setup config")
}
// check if this is just an empty file, no need to produce a json error later if so
if len(b) == 0 {
return cfg, nil
}
err = json.Unmarshal(b, &cfg)
return cfg, errors.Wrap(err, "error unmarshaling previous device setup config")
}
func writeLVMConfig(root string, cfg directLVMConfig) error {
p := filepath.Join(root, "setup-config.json")
b, err := json.Marshal(cfg)
if err != nil {
return errors.Wrap(err, "error marshalling direct lvm config")
}
err = ioutil.WriteFile(p, b, 0600)
return errors.Wrap(err, "error writing direct lvm config to file")
}
func setupDirectLVM(cfg directLVMConfig) error {
lvmProfileDir := "/etc/lvm/profile"
binaries := []string{"pvcreate", "vgcreate", "lvcreate", "lvconvert", "lvchange", "thin_check"}
for _, bin := range binaries {
if _, err := exec.LookPath(bin); err != nil {
return errors.Wrap(err, "error looking up command `"+bin+"` while setting up direct lvm")
}
}
err := os.MkdirAll(lvmProfileDir, 0755)
if err != nil {
return errors.Wrap(err, "error creating lvm profile directory")
}
if cfg.AutoExtendPercent == 0 {
cfg.AutoExtendPercent = 20
}
if cfg.AutoExtendThreshold == 0 {
cfg.AutoExtendThreshold = 80
}
if cfg.ThinpPercent == 0 {
cfg.ThinpPercent = 95
}
if cfg.ThinpMetaPercent == 0 {
cfg.ThinpMetaPercent = 1
}
out, err := exec.Command("pvcreate", "-f", cfg.Device).CombinedOutput()
if err != nil {
return errors.Wrap(err, string(out))
}
out, err = exec.Command("vgcreate", "docker", cfg.Device).CombinedOutput()
if err != nil {
return errors.Wrap(err, string(out))
}
out, err = exec.Command("lvcreate", "--wipesignatures", "y", "-n", "thinpool", "docker", "--extents", fmt.Sprintf("%d%%VG", cfg.ThinpPercent)).CombinedOutput()
if err != nil {
return errors.Wrap(err, string(out))
}
out, err = exec.Command("lvcreate", "--wipesignatures", "y", "-n", "thinpoolmeta", "docker", "--extents", fmt.Sprintf("%d%%VG", cfg.ThinpMetaPercent)).CombinedOutput()
if err != nil {
return errors.Wrap(err, string(out))
}
out, err = exec.Command("lvconvert", "-y", "--zero", "n", "-c", "512K", "--thinpool", "docker/thinpool", "--poolmetadata", "docker/thinpoolmeta").CombinedOutput()
if err != nil {
return errors.Wrap(err, string(out))
}
profile := fmt.Sprintf("activation{\nthin_pool_autoextend_threshold=%d\nthin_pool_autoextend_percent=%d\n}", cfg.AutoExtendThreshold, cfg.AutoExtendPercent)
err = ioutil.WriteFile(lvmProfileDir+"/docker-thinpool.profile", []byte(profile), 0600)
if err != nil {
return errors.Wrap(err, "error writing docker thinp autoextend profile")
}
out, err = exec.Command("lvchange", "--metadataprofile", "docker-thinpool", "docker/thinpool").CombinedOutput()
return errors.Wrap(err, string(out))
}