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// Copyright (c) 2018-2022, Sylabs Inc. All rights reserved.
// This software is licensed under a 3-clause BSD license. Please consult the
// LICENSE.md file distributed with the sources of this project regarding your
// rights to use or distribute this software.
package sysctl
import (
"fmt"
"os"
"path/filepath"
"strings"
)
const procSys = "/proc/sys"
func convertKey(key string) string {
return strings.Replace(strings.TrimSpace(key), ".", string(os.PathSeparator), -1)
}
func getPath(key string) (string, error) {
path := filepath.Join(procSys, convertKey(key))
if _, err := os.Stat(path); err != nil {
return "", err
}
return path, nil
}
// Get retrieves and returns sysctl key value
func Get(key string) (string, error) {
var path string
path, err := getPath(key)
if err != nil {
return "", fmt.Errorf("can't retrieve key %s: %s", key, err)
}
value, err := os.ReadFile(path)
if err != nil {
return "", fmt.Errorf("can't retrieve value for key %s: %s", key, err)
}
return strings.TrimSuffix(string(value), "\n"), nil
}
// Set sets value for sysctl key value
func Set(key string, value string) error {
var path string
path, err := getPath(key)
if err != nil {
return fmt.Errorf("can't retrieve key %s: %s", key, err)
}
return os.WriteFile(path, []byte(value), 0o000)
}
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