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deepseek-harness/website/zh-CN/api/harness/bash.md
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# ctx.bash
`BashExecutor` (abstract seam) — provided by `@deepseek-ai/dsh-bash`.
Abstract bash execution service. Subclass, implement the abstract methods, and load the subclass as a plugin — it registers as `ctx.bash` (one implementation per context; loading a second throws, which is cordis' standard duplicate-service behavior).
Implementations must honor these semantics:
- run rejects only for infrastructure failures. Nonzero exits, timeout kills, and abort kills resolve with a BashRunResult.
- start returns immediately; no timeout applies to background processes. `done` settles at process close and never rejects; spawn failures settle as `killed` with the error on stderr.
- BashProcess.readOutput is incremental: consecutive reads never repeat output. Lossy reads report truncation and available spill files.
- Disposal kills all running background processes and awaits their exit.
[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/bash/bash/src/index.ts#L49)
### ctx.bash.sandboxMode
```ts website-api
/**
* The sandbox mode this executor applies by default, or `undefined` when it
* does not sandbox commands.
* @returns the configured default sandbox mode, when supported.
*/
get sandboxMode(): SandboxMode | undefined
```
The sandbox mode this executor applies by default, or `undefined` when it does not sandbox commands.
[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/bash/bash/src/index.ts#L59)
### ctx.bash.resolve(request)
```ts website-api
/**
* Apply implementation-owned defaults and caps to a request before execution.
* @param request - the caller's request; omitted fields get this
* implementation's defaults, capped fields are clamped.
* @returns the fully-specified spec to hand to {@link run}/{@link start}.
*/
abstract resolve(request: BashExecRequest): BashExecSpec
```
Apply implementation-owned defaults and caps to a request before execution.
- `request` — the caller's request; omitted fields get this implementation's defaults, capped fields are clamped.
**Returns** the fully-specified spec to hand to `run`/`start`.
[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/bash/bash/src/index.ts#L69)
### ctx.bash.run(spec)
```ts website-api
/**
* Run a command in the foreground; resolves when it finishes.
* @param spec - a resolved spec from {@link resolve}, never a raw request.
* @returns the outcome; nonzero exits, timeout kills, and abort kills
* resolve with a descriptive result rather than reject.
*/
abstract run(spec: BashExecSpec): Promise<BashRunResult>
```
Run a command in the foreground; resolves when it finishes.
- `spec` — a resolved spec from `resolve`, never a raw request.
**Returns** the outcome; nonzero exits, timeout kills, and abort kills resolve with a descriptive result rather than reject.
[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/bash/bash/src/index.ts#L77)
### ctx.bash.start(spec)
```ts website-api
/**
* Start a background process and return its handle immediately.
* @param spec - a resolved spec from {@link resolve}, never a raw request.
* @returns the live process handle (reads, kill, quiescence promise).
*/
abstract start(spec: BashExecSpec): BashProcess
```
Start a background process and return its handle immediately.
- `spec` — a resolved spec from `resolve`, never a raw request.
**Returns** the live process handle (reads, kill, quiescence promise).
[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/bash/bash/src/index.ts#L84)