github.com/openebs/node-disk-manager@v1.9.1-0.20230225014141-4531f06ffa1e/pkg/sysfs/util.go (about)

     1  /*
     2  Copyright 2020 The OpenEBS Authors
     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 sysfs
    18  
    19  import (
    20  	"io/ioutil"
    21  	"path/filepath"
    22  	"strconv"
    23  	"strings"
    24  )
    25  
    26  // readSysFSFileAsInt64 reads a file and
    27  // converts that content into int64
    28  func readSysFSFileAsInt64(sysFilePath string) (int64, error) {
    29  	b, err := ioutil.ReadFile(filepath.Clean(sysFilePath))
    30  	if err != nil {
    31  		return 0, err
    32  	}
    33  	// Remove tailing newline (usual in sysfs) before parsing
    34  	return strconv.ParseInt(strings.TrimSuffix(string(b), "\n"), 10, 64)
    35  }
    36  
    37  func readSysFSFileAsString(sysFilePath string) (string, error) {
    38  	b, err := ioutil.ReadFile(filepath.Clean(sysFilePath))
    39  	if err != nil {
    40  		return "", err
    41  	}
    42  	// Remove tailing newline (usual in sysfs)
    43  	return strings.TrimSuffix(string(b), "\n"), nil
    44  }
    45  
    46  // addDevPrefix adds the /dev prefix to all the device names
    47  func addDevPrefix(devNames []string) []string {
    48  	result := make([]string, 0)
    49  	for _, devName := range devNames {
    50  		result = append(result, "/dev/"+devName)
    51  	}
    52  	return result
    53  }