github.com/hasnat/dolt/go@v0.0.0-20210628190320-9eb5d843fbb7/libraries/utils/iohelp/copy.go (about)

     1  // Copyright 2021 Dolthub, Inc.
     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 iohelp
    16  
    17  import (
    18  	"fmt"
    19  	"io"
    20  	"os"
    21  )
    22  
    23  func CopyFile(src, dest string) (size int64, err error) {
    24  	stat, err := os.Stat(src)
    25  	if err != nil {
    26  		return 0, err
    27  	}
    28  
    29  	if !stat.Mode().IsRegular() {
    30  		return 0, fmt.Errorf("%s is not a regular file", src)
    31  	}
    32  
    33  	srcf, err := os.Open(src)
    34  	if err != nil {
    35  		return 0, err
    36  	}
    37  	defer func() {
    38  		closeErr := srcf.Close()
    39  
    40  		if err == nil {
    41  			err = closeErr
    42  		}
    43  	}()
    44  
    45  	destf, err := os.Create(dest)
    46  	if err != nil {
    47  		return 0, err
    48  	}
    49  	defer func() {
    50  		closeErr := destf.Close()
    51  
    52  		if err == nil {
    53  			err = closeErr
    54  		}
    55  	}()
    56  
    57  	return io.Copy(destf, srcf)
    58  }