github.com/ledgerwatch/erigon-lib@v1.0.0/common/dir/rw_dir.go (about)

     1  /*
     2     Copyright 2021 Erigon contributors
     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 dir
    18  
    19  import (
    20  	"os"
    21  	"path/filepath"
    22  )
    23  
    24  func MustExist(path string) {
    25  	const perm = 0764 // user rwx, group rw, other r
    26  	if err := os.MkdirAll(path, perm); err != nil {
    27  		panic(err)
    28  	}
    29  }
    30  
    31  func Exist(path string) bool {
    32  	_, err := os.Stat(path)
    33  	if err != nil && os.IsNotExist(err) {
    34  		return false
    35  	}
    36  	return true
    37  }
    38  
    39  func FileExist(path string) bool {
    40  	fi, err := os.Stat(path)
    41  	if err != nil && os.IsNotExist(err) {
    42  		return false
    43  	}
    44  	if !fi.Mode().IsRegular() {
    45  		return false
    46  	}
    47  	return true
    48  }
    49  
    50  func Recreate(dir string) {
    51  	if Exist(dir) {
    52  		_ = os.RemoveAll(dir)
    53  	}
    54  	MustExist(dir)
    55  }
    56  
    57  func HasFileOfType(dir, ext string) bool {
    58  	files, err := os.ReadDir(dir)
    59  	if err != nil {
    60  		return false
    61  	}
    62  	for _, f := range files {
    63  		if f.IsDir() {
    64  			continue
    65  		}
    66  		if filepath.Ext(f.Name()) == ext {
    67  			return true
    68  		}
    69  	}
    70  	return false
    71  }
    72  
    73  func DeleteFilesOfType(dir string, exts ...string) {
    74  	d, err := os.Open(dir)
    75  	if err != nil {
    76  		if os.IsNotExist(err) {
    77  			return
    78  		}
    79  		panic(err)
    80  	}
    81  	defer d.Close()
    82  
    83  	files, err := d.Readdir(-1)
    84  	if err != nil {
    85  		panic(err)
    86  	}
    87  
    88  	for _, file := range files {
    89  		if !file.Mode().IsRegular() {
    90  			continue
    91  		}
    92  
    93  		for _, ext := range exts {
    94  			if filepath.Ext(file.Name()) == ext {
    95  				_ = os.Remove(filepath.Join(dir, file.Name()))
    96  			}
    97  		}
    98  	}
    99  }