Struct LocalBackend 

pub struct LocalBackend { /* private fields */ }

Runs the build locally via the in-process DAG scheduler, executing each step inside a VM provided by the injected hm_vm::VmBackend.

Constructed once and reused across multiple start calls. parallelism controls the maximum number of concurrently running step chains; the scheduler serialises within each chain regardless.

Implementations

impl LocalBackend

pub fn new(parallelism: NonZeroUsize, vm_backend: Arc<dyn VmBackend>) -> Self

Build a backend that executes steps on the given hm_vm::VmBackend.

parallelism = max concurrent step chains. The NonZeroUsize type makes the scheduler’s semaphore construction deadlock-free by construction (a zero-permit semaphore would stall every step).

Trait Implementations

impl Debug for LocalBackend

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl ExecutionBackend for LocalBackend

fn name(&self) -> &'static str

Stable id for diagnostics/telemetry (“local-docker”, “cloud”).

fn capabilities(&self) -> Capabilities

What this backend can honor — consulted by the CLI before start.

fn start<'life0, 'async_trait>( &'life0 self, req: RunRequest, ) -> Pin<Box<dyn Future<Output = Result<BackendHandle>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait,

Begin running the whole build. Setup failures (auth, bad plan, no daemon) fail here; a failed build is Ok(handle) resolving to BuildOutcome { status: Failed }.