github.com/kaituanwang/hyperledger@v2.0.1+incompatible/bccsp/utils/io.go (about)

     1  /*
     2  Copyright IBM Corp. 2017 All Rights Reserved.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8  		 http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package utils
    18  
    19  import (
    20  	"io"
    21  	"os"
    22  )
    23  
    24  // DirMissingOrEmpty checks is a directory is missing or empty
    25  func DirMissingOrEmpty(path string) (bool, error) {
    26  	dirExists, err := DirExists(path)
    27  	if err != nil {
    28  		return false, err
    29  	}
    30  	if !dirExists {
    31  		return true, nil
    32  	}
    33  
    34  	dirEmpty, err := DirEmpty(path)
    35  	if err != nil {
    36  		return false, err
    37  	}
    38  	if dirEmpty {
    39  		return true, nil
    40  	}
    41  	return false, nil
    42  }
    43  
    44  // DirExists checks if a directory exists
    45  func DirExists(path string) (bool, error) {
    46  	_, err := os.Stat(path)
    47  	if err == nil {
    48  		return true, nil
    49  	}
    50  	if os.IsNotExist(err) {
    51  		return false, nil
    52  	}
    53  	return false, err
    54  }
    55  
    56  // DirEmpty checks if a directory is empty
    57  func DirEmpty(path string) (bool, error) {
    58  	f, err := os.Open(path)
    59  	if err != nil {
    60  		return false, err
    61  	}
    62  	defer f.Close()
    63  
    64  	_, err = f.Readdir(1)
    65  	if err == io.EOF {
    66  		return true, nil
    67  	}
    68  	return false, err
    69  }