Sha256: 7ef4bfba4a6723702a7e6307d1c9182a8c67cec653b1e62a10bc44f311ab33de
Contents?: true
Size: 1.13 KB
Versions: 20
Compression:
Stored size: 1.13 KB
Contents
use rustix::cstr;
use rustix::fs::{openat, statat, AtFlags, Mode, OFlags, CWD};
use rustix::io::Errno;
use std::sync::atomic::{AtomicBool, Ordering::Relaxed};
static WORKING: AtomicBool = AtomicBool::new(false);
static CHECKED: AtomicBool = AtomicBool::new(false);
#[inline]
pub(crate) fn beneath_supported() -> bool {
if WORKING.load(Relaxed) {
return true;
}
if CHECKED.load(Relaxed) {
return false;
}
check_beneath_supported()
}
#[cold]
fn check_beneath_supported() -> bool {
// `RESOLVE_BENEATH` was introduced in FreeBSD 13, but opening `..` within
// the root directory re-opened the root directory. In FreeBSD 14, it fails
// as cap-std expects.
if let Ok(root) = openat(
CWD,
cstr!("/"),
OFlags::RDONLY | OFlags::CLOEXEC,
Mode::empty(),
) {
// Unknown O_ flags get ignored but AT_ flags have strict checks, so we use that.
if let Err(Errno::NOTCAPABLE) = statat(root, cstr!(".."), AtFlags::RESOLVE_BENEATH) {
WORKING.store(true, Relaxed);
return true;
}
}
CHECKED.store(true, Relaxed);
false
}
Version data entries
20 entries across 20 versions & 1 rubygems