Hmbown/CodeWhale · warning

tempdir

Error message

tempdir

What it means

Test panic from `tempfile::tempdir().expect("tempdir")` in a_first_launch_records_the_version_without_claiming_an_update: the temp home directory for record_launch could not be created, so the first-launch bookkeeping test aborts during setup.

Solutions

  1. Validate TMPDIR/TMP env vars point to an existing writable directory and recreate if needed.
  2. Free disk space or inodes on the partition backing the temp directory.
  3. Rerun with an explicit writable temp root: TMPDIR=$(mktemp -d) cargo test -p codewhale-release a_first_launch_records.

Example fix

// before
cargo test -p codewhale-release
// after
TMPDIR=$(mktemp -d) cargo test -p codewhale-release a_first_launch_records_the_version
Defensive patterns

Strategy: try-catch

Validate before calling

assert!(std::env::temp_dir().exists(), "temp root must exist; check TMPDIR");

Type guard

fn tempdir_usable() -> bool {
    let probe = std::env::temp_dir().join(".cw-probe");
    std::fs::write(&probe, b"x").is_ok() && std::fs::remove_file(&probe).is_ok()
}

Try / catch

let home = tempfile::tempdir()
    .unwrap_or_else(|e| panic!("temp home unavailable: {e} — check TMPDIR and disk space"));

Prevention

When it happens

Trigger: Calling tempfile::tempdir() when the OS temp directory is unavailable: invalid TMPDIR, missing temp root, full disk/inodes, or a sandboxed CI environment denying temp directory creation.

Common situations: CI runners with restricted or full /tmp; TMPDIR pointing at a removed path; disk quota exhaustion on the build machine.

Understand the failure class

Background: "File not found" and ENOENT errors: why libraries can't find a file that should exist — this error's family across 50 libraries.

Related errors

AI-assisted analysis of Hmbown/CodeWhale@433685b202 (2026-09-15). Data as JSON: /api/errors/819e5a5c08eed478. Report an issue: GitHub.

Appendix: source

Thrown at crates/release/src/launch.rs:238

        assert!(version_change(Some("0.9.9"), "0.9.10").is_some());
        assert_eq!(version_change(Some("0.9.10"), "0.9.9"), None);
    }

    #[test]
    fn a_prerelease_sorts_below_the_release_it_precedes() {
        assert!(version_change(Some("0.9.11-pre"), "0.9.11").is_some());
        assert_eq!(version_change(Some("0.9.11"), "0.9.11-pre"), None);
    }

    #[test]
    fn an_unparseable_version_on_either_side_produces_no_hint() {
        assert_eq!(version_change(Some("not-a-version"), "0.9.11"), None);
        assert_eq!(version_change(Some("0.9.10"), "also-not-a-version"), None);
    }

    #[test]
    fn a_first_launch_records_the_version_without_claiming_an_update() {
        let home = tempfile::tempdir().expect("tempdir");
        let outcome = record_launch(home.path(), "0.9.10");
        assert_eq!(outcome.change, None);
        assert!(outcome.record_error.is_none());
        assert_eq!(
            LastLaunch::load(&record_path_in(home.path())).map(|r| r.version),
            Some("0.9.10".to_string())
        );
    }

    #[test]
    fn the_hint_fires_once_and_not_again_on_the_next_launch() {
        let home = tempfile::tempdir().expect("tempdir");
        record_launch(home.path(), "0.9.10");
        assert!(record_launch(home.path(), "0.9.11").change.is_some());
        assert_eq!(record_launch(home.path(), "0.9.11").change, None);
    }

    // The record answers "what ran last", so a downgrade must overwrite it.

View on GitHub (pinned to 433685b202)