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Contents
//! Linux has an `O_PATH` flag which allows opening a file without necessary
//! having read or write access to it; we can use that with `openat2` and
//! `fstat` to perform a fast sandboxed `stat`.
use super::file_metadata;
use crate::fs::{manually, open_beneath, FollowSymlinks, Metadata, OpenOptions};
use rustix::fs::OFlags;
use std::path::Path;
use std::{fs, io};
/// Use `openat2` with `O_PATH` and `fstat`. If that's not available, fallback
/// to `manually::stat`.
pub(crate) fn stat_impl(
start: &fs::File,
path: &Path,
follow: FollowSymlinks,
) -> io::Result<Metadata> {
use std::os::unix::fs::OpenOptionsExt;
// Open the path with `O_PATH`. Use `read(true)` even though we don't need
// `read` permissions, because Rust's libstd requires an access mode, and
// Linux ignores `O_RDONLY` with `O_PATH`.
let result = open_beneath(
start,
path,
OpenOptions::new()
.read(true)
.follow(follow)
.custom_flags(OFlags::PATH.bits() as i32),
);
// If that worked, call `fstat`.
match result {
Ok(file) => file_metadata(&file),
Err(err) => match rustix::io::Errno::from_io_error(&err) {
// `ENOSYS` from `open_beneath` means `openat2` is unavailable
// and we should use a fallback.
Some(rustix::io::Errno::NOSYS) => manually::stat(start, path, follow),
_ => Err(err),
},
}
}
Version data entries
6 entries across 6 versions & 1 rubygems