github.com/scaleoutsean/fusego@v0.0.0-20220224074057-4a6429e46bb8/fsutil/fsutil.go (about)

     1  // Copyright 2015 Google Inc. All Rights Reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package fsutil
    16  
    17  import (
    18  	"fmt"
    19  	"io/ioutil"
    20  	"os"
    21  	"path"
    22  )
    23  
    24  // Create a temporary file with the same semantics as ioutil.TempFile, but
    25  // ensure that it is unlinked before returning so that it does not persist
    26  // after the process exits.
    27  //
    28  // Warning: this is not production-quality code, and should only be used for
    29  // testing purposes. In particular, there is a race between creating and
    30  // unlinking by name.
    31  func AnonymousFile(dir string) (*os.File, error) {
    32  	// Choose a prefix based on the binary name.
    33  	prefix := path.Base(os.Args[0])
    34  
    35  	// Create the file.
    36  	f, err := ioutil.TempFile(dir, prefix)
    37  	if err != nil {
    38  		return nil, fmt.Errorf("TempFile: %v", err)
    39  	}
    40  
    41  	// Unlink it.
    42  	if err := os.Remove(f.Name()); err != nil {
    43  		return nil, fmt.Errorf("Remove: %v", err)
    44  	}
    45  
    46  	return f, nil
    47  }
    48  
    49  // Call fdatasync on the supplied file.
    50  //
    51  // REQUIRES: FdatasyncSupported is true.
    52  func Fdatasync(f *os.File) error {
    53  	return fdatasync(f)
    54  }