vendor/rustix/tests/fs/renameat.rs

#[cfg(any(target_os = "android", target_os = "linux"))]
use rustix::fs::Stat;

#[cfg(any(target_os = "android", target_os = "linux"))]
fn same(a: &Stat, b: &Stat) -> bool {
    a.st_ino == b.st_ino && a.st_dev == b.st_dev
}

#[cfg(any(target_os = "android", target_os = "linux"))]
#[test]
fn test_renameat() {
    use rustix::fs::{cwd, openat, renameat, statat, AtFlags, Mode, OFlags};

    let tmp = tempfile::tempdir().unwrap();
    let dir = openat(
        cwd(),
        tmp.path(),
        OFlags::RDONLY | OFlags::PATH,
        Mode::empty(),
    )
    .unwrap();

    let _ = openat(&dir, "foo", OFlags::CREATE | OFlags::WRONLY, Mode::empty()).unwrap();
    let before = statat(&dir, "foo", AtFlags::empty()).unwrap();
    renameat(&dir, "foo", &dir, "bar").unwrap();
    let renamed = statat(&dir, "bar", AtFlags::empty()).unwrap();
    assert!(same(&before, &renamed));
}

/// Like `test_renameat` but the file already exists, so `renameat`
/// overwrites it.
#[cfg(any(target_os = "android", target_os = "linux"))]
#[test]
fn test_renameat_overwrite() {
    use rustix::fs::{cwd, openat, renameat, statat, AtFlags, Mode, OFlags};

    let tmp = tempfile::tempdir().unwrap();
    let dir = openat(
        cwd(),
        tmp.path(),
        OFlags::RDONLY | OFlags::PATH,
        Mode::empty(),
    )
    .unwrap();

    let _ = openat(&dir, "foo", OFlags::CREATE | OFlags::WRONLY, Mode::empty()).unwrap();
    let _ = openat(&dir, "bar", OFlags::CREATE | OFlags::WRONLY, Mode::empty()).unwrap();
    let before = statat(&dir, "foo", AtFlags::empty()).unwrap();
    renameat(&dir, "foo", &dir, "bar").unwrap();
    let renamed = statat(&dir, "bar", AtFlags::empty()).unwrap();
    assert!(same(&before, &renamed));
}

#[cfg(any(target_os = "android", target_os = "linux"))]
#[test]
fn test_renameat_with() {
    use rustix::fs::{cwd, openat, renameat_with, statat, AtFlags, Mode, OFlags, RenameFlags};

    let tmp = tempfile::tempdir().unwrap();
    let dir = openat(
        cwd(),
        tmp.path(),
        OFlags::RDONLY | OFlags::PATH,
        Mode::empty(),
    )
    .unwrap();

    let _ = openat(&dir, "foo", OFlags::CREATE | OFlags::WRONLY, Mode::empty()).unwrap();
    let before = statat(&dir, "foo", AtFlags::empty()).unwrap();

    match renameat_with(&dir, "foo", &dir, "red", RenameFlags::empty()) {
        Ok(()) => (),
        Err(e) if e == rustix::io::Errno::NOSYS => return,
        Err(e) => unreachable!("unexpected error from renameat_with: {:?}", e),
    }

    let renamed = statat(&dir, "red", AtFlags::empty()).unwrap();
    assert!(same(&before, &renamed));

    let _ = openat(
        &dir,
        "green",
        OFlags::CREATE | OFlags::WRONLY,
        Mode::empty(),
    )
    .unwrap();

    #[cfg(all(target_os = "linux", target_env = "gnu"))]
    {
        let green = statat(&dir, "green", AtFlags::empty()).unwrap();

        renameat_with(&dir, "red", &dir, "green", RenameFlags::NOREPLACE).unwrap_err();
        let renamed = statat(&dir, "red", AtFlags::empty()).unwrap();
        assert!(same(&before, &renamed));
        let orig = statat(&dir, "green", AtFlags::empty()).unwrap();
        assert!(same(&green, &orig));

        renameat_with(&dir, "red", &dir, "green", RenameFlags::EXCHANGE).unwrap();
        let renamed = statat(&dir, "red", AtFlags::empty()).unwrap();
        assert!(same(&green, &renamed));
        let orig = statat(&dir, "green", AtFlags::empty()).unwrap();
        assert!(same(&before, &orig));
    }
}