# Pipeline

The platform runs two pipelines, both defined by declarative contracts that
are the single source of truth for the workflow files.

## CI pipeline

The CI pipeline runs on every push and pull request to `main`. It is defined
by [`pipelines/ci.yml`](https://github.com/nova/nova/blob/main/pipelines/ci.yml),
validated against
[`schemas/pipeline.schema.json`](https://github.com/nova/nova/blob/main/schemas/pipeline.schema.json).
Both platform-runner workflow files implement the same contract and are
byte-identical:

- `.github/workflows/ci.yml` — GitHub Actions (production)

Three stages run in sequence:

1. **lint** — `py_compile` across the platform's Python files.
2. **test** — `pytest` across the offline test suite.
3. **check-only** — `run_platform.sh --check-only` (offline, no AWS).

`scripts/run_ci.sh` mirrors the CI pipeline locally so the pipeline is fully
reproducible from the shell:

```bash
bash scripts/run_ci.sh           # run all 3 stages
bash scripts/run_ci.sh --quiet    # suppress per-stage banners
```

## Deployment pipeline

The deployment pipeline runs when a consumer submits a contract. It is
defined by [`pipelines/contract.yml`](https://github.com/nova/nova/blob/main/pipelines/contract.yml),
validated against
[`schemas/deploy-pipeline.schema.json`](https://github.com/nova/nova/blob/main/schemas/deploy-pipeline.schema.json).
It is exposed to consumer repos as a **reusable workflow**:

- `.github/workflows/deploy.yml` — GitHub Actions (production)

A consumer repo invokes the reusable workflow via a **versioned tag**
(floating MAJOR + MINOR, e.g. `nova/.github/workflows/deploy.yml@v1.19`).
The workflow checks out the consumer repo, then checks out the Nova platform
repo into the runner workspace, and runs `scripts/run_platform.sh` against
the consumer's contract. The consumer never clones the platform repo or
invokes its scripts locally. See the [Consumer Guide](../consumer-guide/)
for the end-to-end happy path.

## Deployment stages

```mermaid
flowchart TD
    S1["validate-contract<br/>schema check"] --> S2
    S2["resolve-stack<br/>contract -&gt; Target Stack"] --> S3
    S3["security checks<br/>(adapter)"] --> S4
    S4["infrastructure plan<br/>(adapter compiles the stack)"] --> S5
    S5["policy checks<br/>(adapter -&gt; PolicyCheckResult)"] --> S6
    S6["confidence<br/>score + band"] --> S7
    S7["evidence event<br/>to the audit outbox"] --> S8
    S8["infrastructure apply<br/>(dev only)"]
```

1. **validate-contract** — validates the contract YAML against the contract
   schema. Fails fast on missing fields, unknown modules, or wrong types.
2. **resolve-stack** — the contract resolver resolves the contract to a
   Target Stack instance (loads the module's pattern, expands its children,
   wires the contract inputs, emits a stack JSON instance).
3. **security checks** (adapter) — security checks run on the resolved
   stack before any infrastructure is planned.
4. **infrastructure plan** (adapter) — the engine adapter compiles the
   stack to an infrastructure plan.
5. **policy checks** (adapter) — policy checks run on the plan. Results are
   normalized to `PolicyCheckResult` records (severity, rule ID, pass/fail).
6. **confidence** — the confidence signal computes a score from 6 inputs
   (policy, validation, freshness, source, history, NFRs). For `dev`, the
   threshold is ≥ 0.50. If the band is `pass`, the pipeline proceeds.
7. **evidence event** — a hash-chained evidence event is written to the
   audit outbox.
8. **infrastructure apply** (dev only) — the infrastructure plan is applied,
   creating the resources. An evidence event for the apply is recorded.

Higher environments hold for human attestation (see
[Environments](../environments/)).

## Output streaming

`scripts/run_platform.sh` streams output by default so the user can see what
the platform is doing:

- **`--check-only`**: streams the emitted infrastructure file content.
- **`--plan-only`** and **full mode**: streams the infrastructure plan output.
- **Full mode**: prints policy-check results with severity, rule ID, and
  pass/fail status.

A `--quiet` flag suppresses streaming (output to log files only).