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18 changes: 13 additions & 5 deletions crates/cargo-test-support/src/paths.rs
Original file line number Diff line number Diff line change
Expand Up @@ -63,28 +63,36 @@ thread_local! {
static TEST_ID: RefCell<Option<usize>> = RefCell::new(None);
}

pub struct TestIdGuard {
_private: (),
pub struct TestGuard {
root: Option<PathBuf>,
}

pub fn init_root(tmp_dir: Option<&'static str>) -> TestIdGuard {
pub fn init_root(tmp_dir: Option<&'static str>) -> TestGuard {
static NEXT_ID: AtomicUsize = AtomicUsize::new(0);

let id = NEXT_ID.fetch_add(1, Ordering::SeqCst);
TEST_ID.with(|n| *n.borrow_mut() = Some(id));

let guard = TestIdGuard { _private: () };
let mut guard = TestGuard { root: None };

set_global_root(tmp_dir);
let r = root();
r.rm_rf();
r.mkdir_p();
guard.root = Some(r);

guard
}

impl Drop for TestIdGuard {
impl Drop for TestGuard {
fn drop(&mut self) {
if let Some(r) = self.root.take() {
// Clean up the root directory only after successful tests,
// using `panicking` as a proxy for failure.
if !std::thread::panicking() {
r.rm_rf();
}
}
TEST_ID.with(|n| *n.borrow_mut() = None);
}
}
Expand Down