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// SPDX-License-Identifier: MPL-2.0
/*
* libpathrs: safe path resolution on Linux
* Copyright (C) 2019-2025 Aleksa Sarai <cyphar@cyphar.com>
* Copyright (C) 2019-2025 SUSE LLC
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/.
*/
package main
import (
"errors"
"fmt"
"io"
"os"
"strings"
"golang.org/x/sys/unix"
"cyphar.com/go-pathrs/procfs"
)
func Main(names ...string) error {
proc, err := procfs.Open(procfs.UnmaskedProcRoot)
if err != nil {
return fmt.Errorf("open proc root: %w", err)
}
defer proc.Close() //nolint:errcheck // example code
for _, name := range names {
path := "sys/" + strings.ReplaceAll(name, ".", "/")
file, err := proc.OpenRoot(path, unix.O_RDONLY)
if err != nil {
return fmt.Errorf("open sysctl %s: %w", name, err)
}
data, err := io.ReadAll(file)
_ = file.Close()
if err != nil {
return fmt.Errorf("read sysctl %s: %w", name, err)
}
fmt.Printf("%s = %q\n", name, string(data))
}
return nil
}
func main() {
if err := Main(os.Args[1:]...); err != nil {
fmt.Fprintf(os.Stderr, "Error: %v\n", err)
fmt.Fprintf(os.Stderr, "Source: %v\n", errors.Unwrap(err))
os.Exit(1)
}
}
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