fs_try_exists.rs - mozsearch

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#![warn(rust_2018_idioms)]

#![cfg(all(feature = "full", not(target_os = "wasi")))] // WASI does not support all fs operations

use tempfile::tempdir;

use tokio::fs;

#[tokio::test]

async fn try_exists() {

    let dir = tempdir().unwrap();

    let existing_path = dir.path().join("foo.txt");

    fs::write(&existing_path, b"Hello File!").await.unwrap();

    let nonexisting_path = dir.path().join("bar.txt");

    assert!(fs::try_exists(existing_path).await.unwrap());

    assert!(!fs::try_exists(nonexisting_path).await.unwrap());

    // FreeBSD root user always has permission to stat.

    #[cfg(all(unix, not(target_os = "freebsd")))]

        use std::os::unix::prelude::PermissionsExt;

        let permission_denied_directory_path = dir.path().join("baz");

        fs::create_dir(&permission_denied_directory_path)

            .await

            .unwrap();

        let permission_denied_file_path = permission_denied_directory_path.join("baz.txt");

        fs::write(&permission_denied_file_path, b"Hello File!")

            .await

            .unwrap();

        let mut perms = tokio::fs::metadata(&permission_denied_directory_path)

            .await

            .unwrap()

            .permissions();

        perms.set_mode(0o244);

        fs::set_permissions(&permission_denied_directory_path, perms)

            .await

            .unwrap();

        let permission_denied_result = fs::try_exists(permission_denied_file_path).await;

        assert_eq!(

            permission_denied_result.err().unwrap().kind(),

            std::io::ErrorKind::PermissionDenied

);