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btrfs.go
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btrfs.go
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package driver
import (
"bytes"
"fmt"
"os"
"os/exec"
"path/filepath"
"code.cloudfoundry.org/lager"
"github.com/concourse/baggageclaim/volume"
)
type BtrFSDriver struct {
logger lager.Logger
btrfsBin string
}
func NewBtrFSDriver(
logger lager.Logger,
btrfsBin string,
) *BtrFSDriver {
return &BtrFSDriver{
logger: logger,
btrfsBin: btrfsBin,
}
}
func (driver *BtrFSDriver) CreateVolume(vol volume.FilesystemInitVolume) error {
_, _, err := driver.run(driver.btrfsBin, "subvolume", "create", vol.DataPath())
if err != nil {
return err
}
return nil
}
func (driver *BtrFSDriver) DestroyVolume(vol volume.FilesystemVolume) error {
volumePathsToDelete := []string{}
findSubvolumes := func(p string, f os.FileInfo, err error) error {
if err != nil {
return err
}
if !f.IsDir() {
return nil
}
isSub, err := isSubvolume(p)
if err != nil {
return fmt.Errorf("failed to check if %s is a subvolume: %s", p, err)
}
if isSub {
volumePathsToDelete = append(volumePathsToDelete, p)
}
return nil
}
if err := filepath.Walk(vol.DataPath(), findSubvolumes); err != nil {
return fmt.Errorf("recursively walking subvolumes for %s failed: %v", vol.DataPath(), err)
}
for i := len(volumePathsToDelete) - 1; i >= 0; i-- {
_, _, err := driver.run(driver.btrfsBin, "subvolume", "delete", volumePathsToDelete[i])
if err != nil {
return err
}
}
return nil
}
func (driver *BtrFSDriver) CreateCopyOnWriteLayer(
childVol volume.FilesystemInitVolume,
parentVol volume.FilesystemLiveVolume,
) error {
_, _, err := driver.run(driver.btrfsBin, "subvolume", "snapshot", parentVol.DataPath(), childVol.DataPath())
return err
}
func (driver *BtrFSDriver) run(command string, args ...string) (string, string, error) {
cmd := exec.Command(command, args...)
logger := driver.logger.Session("run-command", lager.Data{
"command": command,
"args": args,
})
stdout := &bytes.Buffer{}
stderr := &bytes.Buffer{}
cmd.Stdout = stdout
cmd.Stderr = stderr
err := cmd.Run()
loggerData := lager.Data{
"stdout": stdout.String(),
"stderr": stderr.String(),
}
if err != nil {
logger.Error("failed", err, loggerData)
return "", "", err
}
logger.Debug("ran", loggerData)
return stdout.String(), stderr.String(), nil
}
func (driver *BtrFSDriver) Recover(volume.Filesystem) error {
// nothing to do
return nil
}