cellos-supervisor 0.5.1

CellOS execution-cell runner — boots cells in Firecracker microVMs or gVisor, enforces narrow typed authority, emits signed CloudEvents.
Documentation 
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//! Fail-closed when `CELL_OS_REQUIRE_S3_EXPORT=1` and a named S3 export target is unconfigured.

#[cfg(unix)]
mod unix {
    use std::fs::File;
    use std::io::Write;
    use std::path::{Path, PathBuf};
    use std::process::Command;

    fn supervisor_exe() -> PathBuf {
        if let Some(p) = std::env::var_os("CARGO_BIN_EXE_cellos_supervisor") {
            return PathBuf::from(p);
        }
        let root = Path::new(env!("CARGO_MANIFEST_DIR"))
            .parent()
            .and_then(|p| p.parent())
            .expect("cellos-supervisor crate under workspace root");
        let profile = std::env::var("PROFILE").unwrap_or_else(|_| "debug".into());
        root.join("target").join(profile).join("cellos-supervisor")
    }

    #[test]
    fn exits_nonzero_when_s3_export_required_but_presigned_url_missing() {
        let dir = tempfile::tempdir().expect("tempdir");
        let spec_path = dir.path().join("spec.json");
        let json = r#"{
          "apiVersion":"cellos.io/v1",
          "kind":"ExecutionCell",
          "spec":{
            "id":"t-req-s3",
            "authority":{"secretRefs":[]},
            "lifetime":{"ttlSeconds":60},
            "export":{
              "targets":[
                {"name":"artifact-bucket","kind":"s3","bucket":"demo-bucket","keyPrefix":"demo"}
              ],
              "artifacts":[
                {"name":"artifact.txt","path":"/tmp/artifact.txt"}
              ]
            }
          }
        }"#;
        let mut f = File::create(&spec_path).expect("create spec");
        f.write_all(json.as_bytes()).expect("write spec");
        drop(f);

        let exe = supervisor_exe();
        assert!(
            exe.is_file(),
            "supervisor binary missing at {}",
            exe.display()
        );

        let status = Command::new(exe)
            .env("CELLOS_DEPLOYMENT_PROFILE", "portable")
            .env("CELL_OS_USE_NOOP_SINK", "1")
            .env("CELL_OS_REQUIRE_S3_EXPORT", "1")
            .env("CELLOS_CELL_BACKEND", "stub")
            .current_dir(env!("CARGO_MANIFEST_DIR"))
            .arg(&spec_path)
            .status()
            .expect("spawn cellos-supervisor");

        assert!(
            !status.success(),
            "expected failure when S3 export required but presigned URL missing, got {status:?}"
        );
    }
}