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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/.
*/
/*
* File: examples/rust-cat/main.rs
*
* An example program which opens a file inside a root and outputs its
* contents using libpathrs.
*/
use pathrs::{flags::OpenFlags, Root};
use std::io::{prelude::*, BufReader};
use anyhow::{Context, Error};
use clap::{Arg, Command};
fn main() -> Result<(), Error> {
let m = Command::new("cat")
// MSRV(1.67): Use clap::crate_authors!.
.author("Aleksa Sarai <cyphar@cyphar.com>")
.version(clap::crate_version!())
.arg(Arg::new("root").value_name("ROOT"))
.arg(Arg::new("unsafe-path").value_name("PATH"))
.about("")
.get_matches();
let root_path = m
.get_one::<String>("root")
.context("required root argument not provided")?;
let unsafe_path = m
.get_one::<String>("unsafe-path")
.context("required unsafe-path argument not provided")?;
let root = Root::open(root_path).context("open root failed")?;
let file = root
.open_subpath(unsafe_path, OpenFlags::O_RDONLY)
.context("open unsafe path in root")?;
let reader = BufReader::new(file);
for line in reader.lines() {
println!("{}", line.context("read lines")?);
}
Ok(())
}
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