mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
29 lines
669 B
Go
29 lines
669 B
Go
|
package daemon // import "github.com/docker/docker/daemon"
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
"io/ioutil"
|
||
|
|
"os"
|
||
|
|
"path/filepath"
|
||
|
|
|
||
|
|
"github.com/docker/docker/pkg/ioutils"
|
||
|
|
"github.com/pborman/uuid"
|
||
|
|
)
|
||
|
|
|
||
|
|
func loadOrCreateUUID(path string) (string, error) {
|
||
|
|
err := os.MkdirAll(filepath.Dir(path), 0755)
|
||
|
|
if err != nil {
|
||
|
|
return "", err
|
||
|
|
}
|
||
|
|
id, err := ioutil.ReadFile(path)
|
||
|
|
if os.IsNotExist(err) {
|
||
|
|
id = []byte(uuid.New())
|
||
|
|
if err := ioutils.AtomicWriteFile(path, id, os.FileMode(0600)); err != nil {
|
||
|
|
return "", fmt.Errorf("Error saving uuid file: %s", err)
|
||
|
|
}
|
||
|
|
} else if err != nil {
|
||
|
|
return "", fmt.Errorf("Error loading uuid file %s: %s", path, err)
|
||
|
|
}
|
||
|
|
return string(id), nil
|
||
|
|
}
|