mirror of https://github.com/status-im/consul.git
55 lines
1.2 KiB
Go
55 lines
1.2 KiB
Go
// Copyright (c) HashiCorp, Inc.
|
|
// SPDX-License-Identifier: BUSL-1.1
|
|
|
|
package file
|
|
|
|
import (
|
|
"fmt"
|
|
"os"
|
|
"path/filepath"
|
|
|
|
"github.com/hashicorp/go-uuid"
|
|
)
|
|
|
|
// WriteAtomic writes the given contents to a temporary file in the same
|
|
// directory, does an fsync and then renames the file to its real path
|
|
func WriteAtomic(path string, contents []byte) error {
|
|
return WriteAtomicWithPerms(path, contents, 0700, 0600)
|
|
}
|
|
|
|
func WriteAtomicWithPerms(path string, contents []byte, dirPerms, filePerms os.FileMode) error {
|
|
|
|
uuid, err := uuid.GenerateUUID()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
tempPath := fmt.Sprintf("%s-%s.tmp", path, uuid)
|
|
|
|
if err := os.MkdirAll(filepath.Dir(path), dirPerms); err != nil {
|
|
return err
|
|
}
|
|
fh, err := os.OpenFile(tempPath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, filePerms)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if _, err := fh.Write(contents); err != nil {
|
|
fh.Close()
|
|
os.Remove(tempPath)
|
|
return err
|
|
}
|
|
if err := fh.Sync(); err != nil {
|
|
fh.Close()
|
|
os.Remove(tempPath)
|
|
return err
|
|
}
|
|
if err := fh.Close(); err != nil {
|
|
os.Remove(tempPath)
|
|
return err
|
|
}
|
|
if err := os.Rename(tempPath, path); err != nil {
|
|
os.Remove(tempPath)
|
|
return err
|
|
}
|
|
return nil
|
|
}
|