github.com/cockroachdb/cockroach@v20.2.0-alpha.1+incompatible/pkg/util/fileutil/move.go (about)

     1  // Copyright 2019 The Cockroach Authors.
     2  //
     3  // Use of this software is governed by the Business Source License
     4  // included in the file licenses/BSL.txt.
     5  //
     6  // As of the Change Date specified in that file, in accordance with
     7  // the Business Source License, use of this software will be governed
     8  // by the Apache License, Version 2.0, included in the file
     9  // licenses/APL.txt.
    10  
    11  package fileutil
    12  
    13  import (
    14  	"os"
    15  
    16  	"github.com/cockroachdb/cockroach/pkg/util/sysutil"
    17  	"github.com/cockroachdb/errors"
    18  )
    19  
    20  // Move moves a file from a directory to another, while handling
    21  // cross-filesystem moves properly.
    22  // If the target file already exists, it is truncated.
    23  // If the move fails, then the target file may be left in an inconsistent state.
    24  func Move(oldPath, newPath string) error {
    25  	err := os.Rename(oldPath, newPath)
    26  	if !isCrossDeviceLinkError(err) {
    27  		return err
    28  	}
    29  
    30  	if err = CopyFile(oldPath, newPath); err != nil {
    31  		return err
    32  	}
    33  
    34  	return os.RemoveAll(oldPath)
    35  }
    36  
    37  func isCrossDeviceLinkError(err error) bool {
    38  	if err == nil {
    39  		return false
    40  	}
    41  	var le *os.LinkError
    42  	if errors.As(err, &le) {
    43  		return sysutil.IsCrossDeviceLinkErrno(le.Err)
    44  	}
    45  	return false
    46  }