systemg 0.62.1

An agent-friendly general process composer.
Documentation 
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---
title: Hooks
---

# Hooks

Run any shell command after a successful service start or unsuccessful service
exit.

## Events

| Hook | When |
|------|------|
| `onstart` | Service reaches readiness or a one-shot completes successfully |
| `onerr` | Service exits unsuccessfully before or after readiness |

## Configuration

```yaml
services:
  postgres:
    command: "postgres -D /var/lib/postgres"
    hooks:
      onstart:
        command: "echo 'Postgres started'"
        timeout: "10s"
      onerr:
        command: "/usr/local/bin/report-crash postgres"
```

Hooks inherit service environment variables.

## Execution

- Run via `sh -c`
- Fire-and-forget (no retries)
- Timeout kills with SIGKILL
- Failures logged but don't affect service

## Behavior

| Scenario | Hooks |
|----------|-------|
| Start and readiness success | `onstart` |
| Successful one-shot completion | `onstart` |
| Spawn or readiness failure while running | None |
| Clean exit | None |
| Manual stop | None |
| Unsuccessful exit before or after readiness | `onerr` |
| Successful automatic restart | `onstart` |

## Tips

- Keep commands short
- Use env vars for secrets
- Make repeated actions idempotent