jenkinsfile-generator

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---
name: jenkinsfile-generator
description: Generate/create/scaffold Jenkinsfile — declarative, scripted, shared library, CI/CD pipelines.
---

# Jenkinsfile Generator Skill

Generate production-ready Jenkinsfiles following best practices. All generated files are validated using devops-skills:jenkinsfile-validator skill.

## Trigger Phrases
- "Generate a CI pipeline for Maven/Gradle/npm"
- "Create a Jenkins deployment pipeline with approvals"
- "Build a Jenkinsfile with parallel test stages"
- "Create a scripted pipeline with dynamic stage logic"
- "Scaffold a Jenkins shared library"
- "Generate a Jenkinsfile for Docker or Kubernetes agents"

## When to Use
- Creating new Jenkinsfiles (declarative or scripted)
- CI/CD pipelines, Docker/Kubernetes deployments
- Parallel execution, matrix builds, parameterized pipelines
- DevSecOps pipelines with security scanning
- Shared library scaffolding

## Declarative vs Scripted Decision Tree
1. Choose **Declarative** by default when stage order and behavior are mostly static.
2. Choose **Scripted** when runtime-generated stages, complex loops, or dynamic control flow are required.
3. Choose **Shared Library scaffolding** when request is about reusable pipeline functions (`vars/`, `src/`, `resources/`).
4. If unsure, start Declarative and only switch to Scripted if requirements cannot be expressed cleanly.

## Template Map
| Template | Path | Use When |
|---|---|---|
| Declarative basic | `assets/templates/declarative/basic.Jenkinsfile` | Standard CI/CD with predictable stages |
| Declarative parallel example | `examples/declarative-parallel.Jenkinsfile` | Parallel test/build branches with fail-fast behavior |
| Declarative kubernetes example | `examples/declarative-kubernetes.Jenkinsfile` | Kubernetes agent execution using pod templates |
| Scripted basic | `assets/templates/scripted/basic.Jenkinsfile` | Complex conditional logic or generated stages |
| Shared library scaffold | Generated by `scripts/generate_shared_library.py` | Reusable pipeline functions and organization-wide patterns |

## Quick Reference

```groovy
// Minimal Declarative Pipeline
pipeline {
    agent any
    stages {
        stage('Build') { steps { sh 'make' } }
        stage('Test') { steps { sh 'make test' } }
    }
}

// Error-tolerant stage
stage('Flaky Tests') {
    steps {
        catchError(buildResult: 'SUCCESS', stageResult: 'UNSTABLE') {
            sh 'run-flaky-tests.sh'
        }
    }
}

// Conditional deployment with approval
stage('Deploy') {
    when { branch 'main'; beforeAgent true }
    input { message 'Deploy to production?' }
    steps { sh './deploy.sh' }
}
```

| Option | Purpose |
|--------|---------|
| `timeout(time: 1, unit: 'HOURS')` | Prevent hung builds |
| `buildDiscarder(logRotator(numToKeepStr: '10'))` | Manage disk space |
| `disableConcurrentBuilds()` | Prevent race conditions |
| `catchError(buildResult: 'SUCCESS', stageResult: 'FAILURE')` | Continue on error |

## Core Capabilities

### 1. Declarative Pipelines (RECOMMENDED)
**Process:**
1. **Read templates for structure reference:**
   - Read `assets/templates/declarative/basic.Jenkinsfile` to understand the standard structure
   - Templates show the expected sections: pipeline → agent → environment → options → parameters → stages → post
   - For complex requests, adapt the structure rather than copying verbatim
2. **Consult reference documentation:**
   - Read `references/best_practices.md` for performance, security, and reliability patterns
   - Read `references/common_plugins.md` for plugin-specific syntax
3. **Generate with required elements:**
   - Proper stages with descriptive names
   - Environment block with credentials binding (never hardcode secrets)
   - Options: timeout, buildDiscarder, timestamps, disableConcurrentBuilds
   - Post conditions: always (cleanup), success (artifacts), failure (notifications)
   - **Always add `failFast true` or `parallelsAlwaysFailFast()` for parallel blocks**
   - **Always include