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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/.
*/
// Original author of this example code:
// Maxim Zhiburt <zhiburt@gmail.com> (2020)
// File: examples/c/cat.c
//
// An example program which opens a file inside a root and outputs its contents
// using libpathrs.
package main
import (
"errors"
"fmt"
"io"
"os"
"cyphar.com/go-pathrs"
)
func Main(args ...string) error {
if len(args) != 2 {
fmt.Fprintln(os.Stderr, "usage: cat <root> <unsafe-path>")
os.Exit(1)
}
rootPath, unsafePath := args[0], args[1]
root, err := pathrs.OpenRoot(rootPath)
if err != nil {
return fmt.Errorf("open root %q: %w", rootPath, err)
}
defer root.Close()
file, err := root.Open(unsafePath)
if err != nil {
return fmt.Errorf("open %q: %w", unsafePath, err)
}
defer file.Close()
fmt.Fprintf(os.Stderr, "== file %q (from root %q) ==\n", file.Name(), root.IntoFile().Name())
if _, err := io.Copy(os.Stdout, file); err != nil {
return fmt.Errorf("copy file contents to stdout: %w", err)
}
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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