lazaret/crates/lazaret-runtime-supervisor/src/supervision/handoff.rs

#[derive(Clone, Copy, Debug, Deserialize, Eq, PartialEq, Serialize)]
enum RuntimeDescriptorKindV1 {
    Directory,
    RegularFile,
}

#[derive(Clone, Copy, Debug, Deserialize, Eq, PartialEq, Serialize)]
struct RuntimeDescriptorV1 {
    number: i32,
    device: u64,
    inode: u64,
    kind: RuntimeDescriptorKindV1,
}

#[derive(Clone, Debug, Deserialize, Eq, PartialEq, Serialize)]
struct RuntimeStateAnchorHandoffV1 {
    lower: RuntimeDescriptorV1,
    lower_label: Vec<u8>,
    persistent_root: RuntimeDescriptorV1,
    persistent_anchor: RuntimeDescriptorV1,
    persistent_anchor_label: Vec<u8>,
    runtime_root: RuntimeDescriptorV1,
    runtime_anchor: RuntimeDescriptorV1,
    runtime_anchor_label: Vec<u8>,
    expected_lower: (u64, u64),
    persistent_destinations: Vec<Vec<u8>>,
}

#[derive(Clone, Debug, Deserialize, Eq, PartialEq, Serialize)]
struct RuntimeGitRoutingHandoffV1 {
    workspace: RuntimeDescriptorV1,
    workspace_label: Vec<u8>,
    isolated: RuntimeDescriptorV1,
    mountpoint: RuntimeDescriptorV1,
    mountpoint_label: Vec<u8>,
    git_common: RuntimeDescriptorV1,
    git_common_label: Vec<u8>,
    transient_hooks: RuntimeDescriptorV1,
    transient_hooks_label: Vec<u8>,
    transient_config: RuntimeDescriptorV1,
    transient_config_label: Vec<u8>,
    global_excludes: Option<Vec<u8>>,
    isolate_ignored: bool,
}

#[derive(Clone, Debug, Deserialize, Eq, PartialEq, Serialize)]
struct RuntimeNetworkHandoffV1 {
    policy: RuntimeDescriptorV1,
    policy_digest: DerivedPolicyDigest,
    configuration_fingerprint: ConfigurationFingerprint,
    network_sidecar_id: NetworkSidecarId,
}

#[derive(Clone, Debug, Deserialize, Eq, PartialEq, Serialize)]
struct RuntimeSupervisorHandoffV1 {
    domain_id: DomainId,
    generation_id: GenerationId,
    coordinator_id: CoordinatorId,
    state_anchor: Option<RuntimeStateAnchorHandoffV1>,
    git_routing: Option<RuntimeGitRoutingHandoffV1>,
    network: Option<RuntimeNetworkHandoffV1>,
    runsc_program: Vec<u8>,
    runsc_arguments: Vec<Vec<u8>>,
}

#[derive(Clone, Debug, Deserialize, Eq, PartialEq, Serialize)]
enum RuntimeSupervisorHandoff {
    V1(RuntimeSupervisorHandoffV1),
}

fn descriptor(
    number: i32,
    kind: RuntimeDescriptorKindV1,
) -> io::Result<RuntimeDescriptorV1> {
    if number < 0 {
        return Err(io::Error::other("Runtime Supervisor descriptor is invalid"));
    }
    let file = File::open(format!("/proc/self/fd/{number}"))?;
    let status = fstat(&file)?;
    let actual = FileType::from_raw_mode(status.st_mode);
    let expected = match kind {
        RuntimeDescriptorKindV1::Directory => actual.is_dir(),
        RuntimeDescriptorKindV1::RegularFile => actual.is_file(),
    };
    if !expected {
        return Err(io::Error::other(
            "Runtime Supervisor descriptor has the wrong role type",
        ));
    }
    Ok(RuntimeDescriptorV1 {
        number,
        device: status.st_dev,
        inode: status.st_ino,
        kind,
    })
}

fn build_runtime_handoff(launch: &RuntimeSupervisorLaunch) -> io::Result<Vec<u8>> {
    let state_anchor = launch
        .state_anchor
        .as_ref()
        .map(build_state_anchor_handoff)
        .transpose()?;
    let git_routing = launch
        .git_routing
        .as_ref()
        .map(build_git_routing_handoff)
        .transpose()?;
    let network = build_network_handoff(launch)?;
    let handoff = RuntimeSupervisorHandoff::V1(RuntimeSupervisorHandoffV1 {
        domain_id: launch.ownership.domain_id,
        generation_id: launch.ownership.generation_id,
        coordinator_id: launch.ownership.coordinator_id,
        state_anchor,
        git_routing,
        network,
        runsc_program: launch.runsc_command.program().as_bytes().to_vec(),
        runsc_arguments: launch
            .runsc_command
            .arguments()
            .iter()
            .map(|argument| argument.as_bytes().to_vec())
            .collect(),
    });
    let encoded = encode(&handoff).map_err(io::Error::other)?;
    if encoded.len() > MAX_RUNTIME_HANDOFF_BYTES {
        return Err(io::Error::other(
            "Runtime Supervisor handoff is oversized",
        ));
    }
    Ok(encoded)
}

fn build_state_anchor_handoff(
    authority: &StateAnchorLaunchAuthority,
) -> io::Result<RuntimeStateAnchorHandoffV1> {
    Ok(RuntimeStateAnchorHandoffV1 {
        lower: descriptor(
            authority.lower_fd(),
            RuntimeDescriptorKindV1::Directory,
        )?,
        lower_label: authority.lower_label().as_os_str().as_bytes().to_vec(),
        persistent_root: descriptor(
            authority.persistent_root_fd(),
            RuntimeDescriptorKindV1::Directory,
        )?,
        persistent_anchor: descriptor(
            authority.persistent_anchor_fd(),
            RuntimeDescriptorKindV1::Directory,
        )?,
        persistent_anchor_label: authority
            .persistent_anchor_label()
            .as_os_str()
            .as_bytes()
            .to_vec(),
        runtime_root: descriptor(
            authority.runtime_root_fd(),
            RuntimeDescriptorKindV1::Directory,
        )?,
        runtime_anchor: descriptor(
            authority.runtime_anchor_fd(),
            RuntimeDescriptorKindV1::Directory,
        )?,
        runtime_anchor_label: authority
            .runtime_anchor_label()
            .as_os_str()
            .as_bytes()
            .to_vec(),
        expected_lower: authority.expected_lower(),
        persistent_destinations: authority
            .persistent_destinations()
            .iter()
            .map(|path| path.as_os_str().as_bytes().to_vec())
            .collect(),
    })
}

fn build_git_routing_handoff(
    authority: &RuntimeGitRoutingLaunch,
) -> io::Result<RuntimeGitRoutingHandoffV1> {
    Ok(RuntimeGitRoutingHandoffV1 {
        workspace: descriptor(
            authority.workspace.as_raw_fd(),
            RuntimeDescriptorKindV1::Directory,
        )?,
        workspace_label: authority.workspace_label.as_os_str().as_bytes().to_vec(),
        isolated: descriptor(
            authority.isolated.as_raw_fd(),
            RuntimeDescriptorKindV1::Directory,
        )?,
        mountpoint: descriptor(
            authority.mountpoint.as_raw_fd(),
            RuntimeDescriptorKindV1::Directory,
        )?,
        mountpoint_label: authority.mountpoint_label.as_os_str().as_bytes().to_vec(),
        git_common: descriptor(
            authority.git_common.as_raw_fd(),
            RuntimeDescriptorKindV1::Directory,
        )?,
        git_common_label: authority.git_common_label.as_os_str().as_bytes().to_vec(),
        transient_hooks: descriptor(
            authority.transient_hooks.as_raw_fd(),
            RuntimeDescriptorKindV1::Directory,
        )?,
        transient_hooks_label: authority
            .transient_hooks_label
            .as_os_str()
            .as_bytes()
            .to_vec(),
        transient_config: descriptor(
            authority.transient_config.as_raw_fd(),
            RuntimeDescriptorKindV1::RegularFile,
        )?,
        transient_config_label: authority
            .transient_config_label
            .as_os_str()
            .as_bytes()
            .to_vec(),
        global_excludes: authority
            .global_excludes
            .as_ref()
            .map(|path| path.as_os_str().as_bytes().to_vec()),
        isolate_ignored: authority.isolate_ignored,
    })
}

fn build_network_handoff(
    launch: &RuntimeSupervisorLaunch,
) -> io::Result<Option<RuntimeNetworkHandoffV1>> {
    let network = launch
        .policy_file
        .as_ref()
        .map(|policy| -> io::Result<RuntimeNetworkHandoffV1> {
            Ok(RuntimeNetworkHandoffV1 {
                policy: descriptor(
                    policy.as_raw_fd(),
                    RuntimeDescriptorKindV1::RegularFile,
                )?,
                policy_digest: launch
                    .policy_digest
                    .ok_or_else(|| io::Error::other("network policy digest is missing"))?,
                configuration_fingerprint: launch.configuration_fingerprint.ok_or_else(|| {
                    io::Error::other("network configuration fingerprint is missing")
                })?,
                network_sidecar_id: launch
                    .network_sidecar_id
                    .ok_or_else(|| io::Error::other("network sidecar identity is missing"))?,
            })
        })
        .transpose()?;
    if network.is_none()
        && (launch.policy_digest.is_some()
            || launch.configuration_fingerprint.is_some()
            || launch.network_sidecar_id.is_some())
    {
        return Err(io::Error::other(
            "Runtime Supervisor network handoff is partial",
        ));
    }
    Ok(network)
}

fn parse_runtime_handoff(arguments: &[OsString]) -> io::Result<RuntimeArguments> {
    let [descriptor] = arguments else {
        return Err(io::Error::other(
            "Runtime Supervisor requires one handoff descriptor",
        ));
    };
    let handoff_descriptor = parse_descriptor(descriptor)?;
    let mut file = File::open(format!("/proc/self/fd/{handoff_descriptor}"))?;
    require_write_sealed(&file)?;
    let length = usize::try_from(file.metadata()?.len())
        .ok()
        .filter(|length| *length > 0 && *length <= MAX_RUNTIME_HANDOFF_BYTES)
        .ok_or_else(|| io::Error::other("Runtime Supervisor handoff size is invalid"))?;
    let mut encoded = vec![0_u8; length];
    file.read_exact(&mut encoded)?;
    let RuntimeSupervisorHandoff::V1(handoff) =
        decode::<RuntimeSupervisorHandoff>(&encoded).map_err(io::Error::other)?;
    validate_runtime_handoff(handoff_descriptor, &handoff)?;
    if handoff.runsc_program.as_slice() != b"runsc" {
        return Err(io::Error::other("Runtime Supervisor target is not runsc"));
    }
    if !handoff
        .runsc_arguments
        .iter()
        .any(|argument| argument.as_slice() == b"run")
        || handoff.runsc_arguments.iter().any(|argument| {
            matches!(
                argument.as_slice(),
                b"-detach" | b"--detach" | b"-d"
            )
        })
    {
        return Err(io::Error::other(
            "Runtime Supervisor requires foreground attached runsc",
        ));
    }
    Ok(RuntimeArguments {
        ownership: ProcessOwnershipContext {
            domain_id: handoff.domain_id,
            generation_id: handoff.generation_id,
            coordinator_id: handoff.coordinator_id,
            slot: HostProcessOwnershipSlot::SandboxAttachedRunsc,
        },
        state_anchor: handoff.state_anchor.map(runtime_state_anchor_arguments),
        git_routing: handoff.git_routing.map(runtime_git_routing_arguments),
        network: handoff.network.map(|network| RuntimeNetworkArguments {
            policy_fd: network.policy.number,
            policy_digest: network.policy_digest,
            configuration_fingerprint: network.configuration_fingerprint,
            network_sidecar_id: network.network_sidecar_id,
        }),
        runsc_program: OsString::from_vec(handoff.runsc_program),
        runsc_arguments: handoff
            .runsc_arguments
            .into_iter()
            .map(OsString::from_vec)
            .collect(),
    })
}

fn parse_descriptor(value: &OsStr) -> io::Result<i32> {
    value
        .to_str()
        .and_then(|value| value.parse().ok())
        .filter(|descriptor| *descriptor >= 0)
        .ok_or_else(|| io::Error::other("Runtime Supervisor descriptor is invalid"))
}

fn validate_runtime_handoff(
    handoff_descriptor: i32,
    handoff: &RuntimeSupervisorHandoffV1,
) -> io::Result<()> {
    let mut numbers = std::collections::BTreeSet::from([handoff_descriptor]);
    let mut descriptors = Vec::new();
    if let Some(state) = &handoff.state_anchor {
        descriptors.extend([
            state.lower,
            state.persistent_root,
            state.persistent_anchor,
            state.runtime_root,
            state.runtime_anchor,
        ]);
        if state.expected_lower != (state.lower.device, state.lower.inode) {
            return Err(io::Error::other(
                "State Anchor lower identity differs from its descriptor slot",
            ));
        }
    }
    if let Some(git) = &handoff.git_routing {
        descriptors.extend([
            git.workspace,
            git.isolated,
            git.mountpoint,
            git.git_common,
            git.transient_hooks,
            git.transient_config,
        ]);
    }
    if let Some(network) = &handoff.network {
        descriptors.push(network.policy);
    }
    for expected in descriptors {
        if !numbers.insert(expected.number) {
            return Err(io::Error::other(
                "Runtime Supervisor descriptor roles are duplicated",
            ));
        }
        let actual = descriptor(expected.number, expected.kind)?;
        if actual != expected {
            return Err(io::Error::other(
                "Runtime Supervisor descriptor role identity changed",
            ));
        }
        if handoff
            .network
            .as_ref()
            .is_some_and(|network| network.policy == expected)
        {
            let file = File::open(format!("/proc/self/fd/{}", expected.number))?;
            require_write_sealed(file)?;
        }
    }
    Ok(())
}

fn runtime_state_anchor_arguments(
    state: RuntimeStateAnchorHandoffV1,
) -> RuntimeStateAnchorArguments {
    RuntimeStateAnchorArguments {
        lower_fd: state.lower.number,
        lower_label: PathBuf::from(OsString::from_vec(state.lower_label)),
        persistent_root_fd: state.persistent_root.number,
        persistent_anchor_fd: state.persistent_anchor.number,
        persistent_anchor_label: PathBuf::from(OsString::from_vec(
            state.persistent_anchor_label,
        )),
        runtime_root_fd: state.runtime_root.number,
        runtime_anchor_fd: state.runtime_anchor.number,
        runtime_anchor_label: PathBuf::from(OsString::from_vec(state.runtime_anchor_label)),
        expected_lower: state.expected_lower,
        persistent_destinations: state
            .persistent_destinations
            .into_iter()
            .map(|path| PathBuf::from(OsString::from_vec(path)))
            .collect(),
    }
}

fn runtime_git_routing_arguments(
    routing: RuntimeGitRoutingHandoffV1,
) -> RuntimeGitRoutingArguments {
    RuntimeGitRoutingArguments {
        workspace_fd: routing.workspace.number,
        workspace_label: PathBuf::from(OsString::from_vec(routing.workspace_label)),
        isolated_fd: routing.isolated.number,
        mountpoint_fd: routing.mountpoint.number,
        mountpoint_label: PathBuf::from(OsString::from_vec(routing.mountpoint_label)),
        git_common_fd: routing.git_common.number,
        git_common_label: PathBuf::from(OsString::from_vec(routing.git_common_label)),
        transient_hooks_fd: routing.transient_hooks.number,
        transient_hooks_label: PathBuf::from(OsString::from_vec(routing.transient_hooks_label)),
        transient_config_fd: routing.transient_config.number,
        transient_config_label: PathBuf::from(OsString::from_vec(routing.transient_config_label)),
        global_excludes: routing
            .global_excludes
            .map(|path| PathBuf::from(OsString::from_vec(path))),
        isolate_ignored: routing.isolate_ignored,
    }
}

#[cfg(test)]
mod handoff_tests {
    use std::io::{Seek, SeekFrom, Write};
    use std::os::unix::ffi::OsStrExt;

    use rustix::fs::{MemfdFlags, memfd_create};
    use sha2::{Digest, Sha256};

    use super::*;

    fn minimal_handoff(arguments: Vec<Vec<u8>>) -> RuntimeSupervisorHandoff {
        RuntimeSupervisorHandoff::V1(RuntimeSupervisorHandoffV1 {
            domain_id: DomainId::new([1; 32]),
            generation_id: GenerationId::new(2),
            coordinator_id: CoordinatorId::new([3; 32]),
            state_anchor: None,
            git_routing: None,
            network: None,
            runsc_program: b"runsc".to_vec(),
            runsc_arguments: arguments,
        })
    }

    fn sealed_arguments(bytes: &[u8]) -> (File, [OsString; 1]) {
        let file = sealed_memfd("runtime-handoff-test", bytes).unwrap();
        let arguments = [OsString::from(file.as_raw_fd().to_string())];
        (file, arguments)
    }

    fn parse_record(record: &RuntimeSupervisorHandoff) -> io::Result<RuntimeArguments> {
        let encoded = encode(record).unwrap();
        let (_file, arguments) = sealed_arguments(&encoded);
        parse_runtime_handoff(&arguments)
    }

    #[test]
    fn v1_vector_and_non_utf8_runsc_arguments_are_stable() {
        let directory = |number, identity| RuntimeDescriptorV1 {
            number,
            device: identity,
            inode: identity + 1,
            kind: RuntimeDescriptorKindV1::Directory,
        };
        let regular = |number, identity| RuntimeDescriptorV1 {
            kind: RuntimeDescriptorKindV1::RegularFile,
            ..directory(number, identity)
        };
        let record = RuntimeSupervisorHandoff::V1(RuntimeSupervisorHandoffV1 {
            domain_id: DomainId::new([1; 32]),
            generation_id: GenerationId::new(2),
            coordinator_id: CoordinatorId::new([3; 32]),
            state_anchor: Some(RuntimeStateAnchorHandoffV1 {
                lower: directory(10, 100),
                lower_label: b"/lower".to_vec(),
                persistent_root: directory(11, 110),
                persistent_anchor: directory(12, 120),
                persistent_anchor_label: b"/persistent/state-anchor".to_vec(),
                runtime_root: directory(13, 130),
                runtime_anchor: directory(14, 140),
                runtime_anchor_label: b"/runtime/state-anchor".to_vec(),
                expected_lower: (100, 101),
                persistent_destinations: vec![b"/var/lib/tool".to_vec()],
            }),
            git_routing: Some(RuntimeGitRoutingHandoffV1 {
                workspace: directory(15, 150),
                workspace_label: b"/workspace".to_vec(),
                isolated: directory(16, 160),
                mountpoint: directory(17, 170),
                mountpoint_label: b"/runtime/workspace".to_vec(),
                git_common: directory(18, 180),
                git_common_label: b"/workspace/.git".to_vec(),
                transient_hooks: directory(19, 190),
                transient_hooks_label: b"/runtime/hooks".to_vec(),
                transient_config: regular(20, 200),
                transient_config_label: b"/runtime/config".to_vec(),
                global_excludes: Some(b"/home/user/.config/git/ignore".to_vec()),
                isolate_ignored: true,
            }),
            network: Some(RuntimeNetworkHandoffV1 {
                policy: regular(21, 210),
                policy_digest: DerivedPolicyDigest::new([4; 32]),
                configuration_fingerprint: ConfigurationFingerprint::new([5; 32]),
                network_sidecar_id: NetworkSidecarId::new([6; 32]),
            }),
            runsc_program: b"runsc".to_vec(),
            runsc_arguments: vec![
                b"-root=/runtime".to_vec(),
                b"run".to_vec(),
                vec![b'c', 0xff],
            ],
        });
        let encoded = encode(&record).unwrap();
        assert_eq!(
            Sha256::digest(&encoded).as_slice(),
            [
                123, 0, 18, 227, 164, 11, 96, 15, 4, 201, 99, 25, 198, 122, 175, 149, 170,
                165, 12, 40, 209, 64, 119, 67, 10, 109, 128, 44, 201, 103, 14, 182,
            ]
        );
        assert_eq!(
            decode::<RuntimeSupervisorHandoff>(&encoded).unwrap(),
            record
        );
        let parsed = parse_record(&minimal_handoff(vec![
            b"-root=/runtime".to_vec(),
            b"run".to_vec(),
            vec![b'c', 0xff],
        ]))
        .unwrap();
        assert_eq!(parsed.runsc_arguments[2].as_bytes(), [b'c', 0xff]);
    }

    #[test]
    fn unknown_trailing_truncated_unsealed_and_oversize_handoffs_refuse() {
        let record = minimal_handoff(vec![b"run".to_vec(), b"container".to_vec()]);
        let encoded = encode(&record).unwrap();
        for malformed in [
            vec![1],
            {
                let mut trailing = encoded.clone();
                trailing.push(0);
                trailing
            },
            encoded[..encoded.len() - 1].to_vec(),
        ] {
            let (_file, arguments) = sealed_arguments(&malformed);
            assert!(parse_runtime_handoff(&arguments).is_err());
        }

        let descriptor = memfd_create("unsealed-handoff", MemfdFlags::ALLOW_SEALING).unwrap();
        let mut unsealed = File::from(descriptor);
        unsealed.write_all(&encoded).unwrap();
        unsealed.seek(SeekFrom::Start(0)).unwrap();
        let arguments = [OsString::from(unsealed.as_raw_fd().to_string())];
        assert!(parse_runtime_handoff(&arguments).is_err());

        let oversized = vec![0_u8; MAX_RUNTIME_HANDOFF_BYTES + 1];
        let (_file, arguments) = sealed_arguments(&oversized);
        assert!(parse_runtime_handoff(&arguments).is_err());
    }

    #[test]
    fn descriptor_identity_role_substitution_and_duplication_refuse() {
        let first_tree = tempfile::tempdir().unwrap();
        let second_tree = tempfile::tempdir().unwrap();
        let first = File::open(first_tree.path()).unwrap();
        let second = File::open(second_tree.path()).unwrap();
        let first_slot =
            descriptor(first.as_raw_fd(), RuntimeDescriptorKindV1::Directory).unwrap();
        let second_slot =
            descriptor(second.as_raw_fd(), RuntimeDescriptorKindV1::Directory).unwrap();

        let mut role_mismatch = state_record(first_slot);
        role_mismatch.lower.kind = RuntimeDescriptorKindV1::RegularFile;
        assert!(parse_record(&with_state(role_mismatch)).is_err());

        let mut identity_drift = state_record(first_slot);
        identity_drift.lower.inode = identity_drift.lower.inode.wrapping_add(1);
        identity_drift.expected_lower = (
            identity_drift.lower.device,
            identity_drift.lower.inode,
        );
        assert!(parse_record(&with_state(identity_drift)).is_err());

        let mut substitution = state_record(first_slot);
        substitution.lower.number = second_slot.number;
        assert!(parse_record(&with_state(substitution)).is_err());

        assert!(parse_record(&with_state(state_record(first_slot))).is_err());
    }

    #[test]
    fn partial_network_group_and_nonexact_private_argv_refuse() {
        let ownership = ProcessOwnershipContext {
            domain_id: DomainId::new([4; 32]),
            generation_id: GenerationId::new(5),
            coordinator_id: CoordinatorId::new([6; 32]),
            slot: HostProcessOwnershipSlot::SandboxRuntimeSupervisor,
        };
        let launch = RuntimeSupervisorLaunch {
            target: TargetCommand::new("/usr/bin/false").with_lifetime_pipe_parent_edge(),
            handoff_file: None,
            ownership,
            policy_file: None,
            policy_digest: Some(DerivedPolicyDigest::new([7; 32])),
            configuration_fingerprint: None,
            network_sidecar_id: None,
            runsc_command: RunscCommand::new(
                "runsc",
                [OsString::from("run"), OsString::from("container")],
                [8; 32],
            ),
            state_anchor: None,
            git_routing: None,
        };
        assert!(build_runtime_handoff(&launch).is_err());
        assert!(parse_runtime_handoff(&[]).is_err());
        assert!(
            parse_runtime_handoff(&[OsString::from("1"), OsString::from("2")]).is_err()
        );
    }

    fn state_record(slot: RuntimeDescriptorV1) -> RuntimeStateAnchorHandoffV1 {
        RuntimeStateAnchorHandoffV1 {
            lower: slot,
            lower_label: b"/lower".to_vec(),
            persistent_root: slot,
            persistent_anchor: slot,
            persistent_anchor_label: b"/persistent".to_vec(),
            runtime_root: slot,
            runtime_anchor: slot,
            runtime_anchor_label: b"/runtime".to_vec(),
            expected_lower: (slot.device, slot.inode),
            persistent_destinations: vec![b"/state".to_vec()],
        }
    }

    fn with_state(state_anchor: RuntimeStateAnchorHandoffV1) -> RuntimeSupervisorHandoff {
        let RuntimeSupervisorHandoff::V1(mut handoff) =
            minimal_handoff(vec![b"run".to_vec(), b"container".to_vec()]);
        handoff.state_anchor = Some(state_anchor);
        RuntimeSupervisorHandoff::V1(handoff)
    }
}