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//! This module consists of helper types and functions for dealing
//! with setting the file times.
use crate::filesystem::primitives::{OpenOptions, open};
use rustix::io::Errno;
use std::path::Path;
use std::time::SystemTime;
use std::{fs, io};
pub(crate) fn set_times_impl(
start: &fs::File,
path: &Path,
atime: Option<SystemTime>,
mtime: Option<SystemTime>,
) -> io::Result<()> {
let mut times = fs::FileTimes::new();
if let Some(atime) = atime {
times = times.set_accessed(atime);
}
if let Some(mtime) = mtime {
times = times.set_modified(mtime);
}
// Try `futimens` with a normal handle. Normal handles need some kind of
// access, so first try write.
match open(start, path, OpenOptions::new().write(true)) {
Ok(file) => return fs::File::from(file).set_times(times),
Err(err) => match Errno::from_io_error(&err) {
Some(Errno::ACCESS) | Some(Errno::ISDIR) => (),
_ => return Err(err),
},
}
// Next try read.
match open(start, path, OpenOptions::new().read(true)) {
Ok(file) => return fs::File::from(file).set_times(times),
Err(err) => match Errno::from_io_error(&err) {
Some(Errno::ACCESS) => (),
_ => return Err(err),
},
}
// It's not possible to do anything else with generic POSIX. Plain
// `utimensat` has two options:
// - Follow symlinks, which would open up a race in which a concurrent
// modification of the symlink could point outside the sandbox and we
// wouldn't be able to detect it, or
// - Don't follow symlinks, which would modify the timestamp of the symlink
// instead of the file we're trying to get to.
//
// So neither does what we need.
Err(Errno::NOTSUP.into())
}