decdn-common 0.0.1

use super::*;

#[test]
fn an_empty_dir_has_no_daemon_marker() {
    let dir = tempfile::tempdir().unwrap();
    assert_eq!(daemon_marker(dir.path()).unwrap(), None);
}

/// The client's own store is not a daemon marker — otherwise every client
/// data dir would classify as a node's after its first pool.
#[test]
fn the_client_store_is_not_a_daemon_marker() {
    let dir = tempfile::tempdir().unwrap();
    std::fs::write(dir.path().join(CLIENT_BUYER_DB_FILE), b"x").unwrap();
    assert_eq!(daemon_marker(dir.path()).unwrap(), None);
}

/// The reset case this exists for: `buyer.redb` deleted, the rest of the
/// daemon's stores still present. Still a node's data dir.
#[test]
fn a_data_dir_missing_only_the_buyer_store_is_still_a_node_s() {
    let dir = tempfile::tempdir().unwrap();
    std::fs::write(dir.path().join(NODE_LANES_DB_FILE), b"x").unwrap();
    std::fs::write(dir.path().join(NODE_SETTLE_DB_FILE), b"x").unwrap();
    assert_eq!(daemon_marker(dir.path()).unwrap(), Some(NODE_LANES_DB_FILE));
}

#[test]
fn every_daemon_store_file_marks_the_dir() {
    for name in DAEMON_STORE_FILES {
        let dir = tempfile::tempdir().unwrap();
        std::fs::write(dir.path().join(name), b"x").unwrap();
        assert_eq!(daemon_marker(dir.path()).unwrap(), Some(*name), "{name}");
    }
}

/// A stat that fails for any reason but `NotFound` leaves the owner unknown,
/// so it surfaces as an error instead of reading as "not a node". A regular
/// file in place of the directory makes every child stat fail with
/// `NotADirectory`, which holds under any uid (a mode-`000` directory would
/// not stop root).
#[test]
fn a_stat_error_is_not_read_as_no_marker() {
    let dir = tempfile::tempdir().unwrap();
    let not_a_dir = dir.path().join("data");
    std::fs::write(&not_a_dir, b"x").unwrap();
    let err = daemon_marker(&not_a_dir).unwrap_err();
    assert_ne!(err.kind(), io::ErrorKind::NotFound);
    assert!(err.to_string().contains("failed to stat"), "{err}");
}