fusego/fsutil/fsutil.go

55 lines
1.5 KiB
Go

// Copyright 2015 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package fsutil
import (
"fmt"
"io/ioutil"
"os"
"path"
)
// Create a temporary file with the same semantics as ioutil.TempFile, but
// ensure that it is unlinked before returning so that it does not persist
// after the process exits.
//
// Warning: this is not production-quality code, and should only be used for
// testing purposes. In particular, there is a race between creating and
// unlinking by name.
func AnonymousFile(dir string) (*os.File, error) {
// Choose a prefix based on the binary name.
prefix := path.Base(os.Args[0])
// Create the file.
f, err := ioutil.TempFile(dir, prefix)
if err != nil {
return nil, fmt.Errorf("TempFile: %v", err)
}
// Unlink it.
if err := os.Remove(f.Name()); err != nil {
return nil, fmt.Errorf("Remove: %v", err)
}
return f, nil
}
// Call fdatasync on the supplied file.
//
// REQUIRES: FdatasyncSupported is true.
func Fdatasync(f *os.File) error {
return fdatasync(f)
}