chantal 1.1.2

Unified offline repository mirroring for RPM and APT

Chantal

Because every other name was already taken. - A unified CLI tool for offline repository mirroring.

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What is Chantal?

A Python-based CLI tool for offline repository mirroring, inspired by pulp-admin, reposync, and aptly.

The Problem: Enterprise environments need offline mirrors of RPM/APT repositories with version control, efficient storage, RHEL subscription support, and simple management. Existing tools either:

• Support only one repository type (reposync for RPM, apt-mirror for APT)
• Require complex infrastructure (Pulp needs Celery, RabbitMQ, Redis, PostgreSQL)
• Lack proper snapshot and deduplication features

The Solution: One simple CLI tool. No daemons, no message queues, no complex setup. Just sync repositories, create snapshots, and publish static files. Works with any webserver (Apache, NGINX) - because it's just files.

Features

• 🔄 Unified Mirroring - Multiple repository types in one tool (RPM, DEB/APT, Helm, Alpine APK)
• 📦 Deduplication - Content-addressed storage (SHA256), packages stored once
• 📸 Snapshots - Immutable point-in-time repository states for patch management
• 🔍 Views - Virtual repositories combining multiple repos (e.g., BaseOS + AppStream + EPEL)
• 🔌 Modular - Plugin architecture for repository types
• 🚫 No Daemons - Simple CLI tool (optional scheduler for future automation)
• 📁 Static Output - Serve with any webserver (Apache, NGINX)
• 🔐 RHEL CDN Support - Client certificate authentication for Red Hat repos
• 🎯 Smart Filtering - Pattern-based package filtering with post-processing
• 🪞 Mirror & Filtered Modes - Full metadata mirroring or filtered repos with regenerated metadata
• 🔏 Metadata Signing - Sign regenerated metadata in filtered mode: APT (InRelease/Release.gpg), RPM (repomd.xml.asc) and APK (RSA-signed APKINDEX) so clients can verify the repo
• ⚡ Fast Updates - Check for updates without downloading (like dnf check-update)
• 🚀 Metadata Caching - SHA256-based cache for RPM metadata (90-95% faster syncs for RHEL)

Supported Repository Types:

• ✅ RPM/DNF/YUM (RHEL, CentOS, Fedora, Rocky, AlmaLinux, EPEL)
• ✅ DEB/APT (Debian, Ubuntu)
• ✅ Helm Charts (Kubernetes, Bitnami, AWS EKS, Prometheus, GitLab)
• ✅ Alpine APK (Alpine Linux, container base images)

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Quick Start

Installation

Option 1: Container (Recommended)

# Pull from GitHub Container Registry
docker pull ghcr.io/slauger/chantal:latest

# Run
docker run --rm \
  -v $(pwd)/config:/etc/chantal:ro \
  -v $(pwd)/data:/var/lib/chantal \
  -v $(pwd)/repos:/var/www/repos \
  ghcr.io/slauger/chantal:latest --help

Option 2: Python Package

git clone https://github.com/slauger/chantal.git
cd chantal
pip install -e .

Requirements: Python 3.12+, PostgreSQL or SQLite

Basic Usage

# 1. Initialize database schema
chantal db init

# 2. Configure repositories (see docs for examples)
vim /etc/chantal/config.yaml

# 3. Sync repository (RPM, Helm, or APK)
chantal repo sync --repo-id epel9-latest

# 4. Create snapshot
chantal snapshot create --repo-id epel9-latest --name 2025-01

# 5. Publish
chantal publish snapshot --snapshot epel9-latest-2025-01

Result: Published repository in /var/www/repos/ ready to serve with Apache/NGINX.

Database Management

Chantal uses Alembic for database schema migrations:

# Initialize database schema (first-time setup)
chantal db init

# Check current schema version
chantal db current

# Check schema status and pending migrations
chantal db status

# Upgrade to latest schema version
chantal db upgrade

# View migration history
chantal db history

# Database statistics and verification
chantal db stats
chantal db verify

Note: Storage directories are created automatically when needed. The db init command only initializes the database schema.

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Key Features

Content-Addressed Storage

• SHA256-based deduplication (2-level directory: ab/cd/sha256_file.rpm)
• Packages stored once, shared across all repositories
• Typical deduplication: 60-80% across RHEL variants

Immutable Snapshots

• Point-in-time freezes for patch management
• Compare snapshots (chantal snapshot diff)
• Rollback to previous states
• Atomic view snapshots (freeze all repos simultaneously)

Virtual Repositories (Views)

• Combine multiple repos into one: BaseOS + AppStream + CRB
• Mixed repos: RHEL + EPEL in single repository
• Stack-specific views: web server, monitoring, etc.

Smart Filtering

filters:
  patterns:
    include: ["^nginx-.*", "^httpd-.*"]
    exclude: [".*-debug.*"]
  metadata:
    architectures:
      include: ["x86_64", "noarch"]
  post_processing:
    only_latest_version: true

Zero-Copy Publishing

• Hardlinks (not copies) to published directories
• Instant publishing (milliseconds for thousands of packages)
• Atomic metadata updates

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Architecture

/var/lib/chantal/pool/          # Content-addressed storage (SHA256)
├── ab/cd/sha256_package.rpm
└── ...

/var/www/repos/                  # Published repositories (hardlinks)
├── rhel9-baseos/
│   ├── latest/                  # Current state
│   └── snapshots/2025-01/       # Immutable snapshot
└── views/
    └── rhel9-complete/          # Virtual repository
        └── latest/

Database: PostgreSQL or SQLite (SQLAlchemy models) Plugins: Extensible architecture for repository types (RPM, DEB/APT, Helm, APK)

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Documentation

📚 Full Documentation: https://slauger.github.io/chantal/

• Installation Guide
• Quick Start
• CLI Commands
• Configuration
• Views (Virtual Repositories)
• Architecture
• Plugin Development

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Common Workflows

Patch Management

# Monthly cycle
chantal repo sync --all
chantal snapshot create --repo-id rhel9-baseos --name 2025-02
chantal snapshot diff --repo-id rhel9-baseos 2025-01 2025-02
chantal publish snapshot --snapshot rhel9-baseos-2025-02

RHEL Subscription

repositories:
  - id: rhel9-baseos
    feed: https://cdn.redhat.com/content/dist/rhel9/9/x86_64/baseos/os
    ssl:
      client_cert: /etc/pki/entitlement/1234567890.pem
      client_key: /etc/pki/entitlement/1234567890-key.pem

Air-Gapped Environments

# Online system
chantal repo sync --all
tar czf export.tar.gz /var/lib/chantal /etc/chantal

# Offline system
tar xzf export.tar.gz
chantal publish repo --all

See Workflows Documentation for more examples.

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Contributing

Contributions welcome! See GitHub Issues for planned features and improvements.

Development Setup

1. Clone and Setup Virtual Environment:

git clone https://github.com/slauger/chantal.git
cd chantal

# Create virtual environment
make venv
# OR manually: python3 -m venv venv

# Activate virtual environment
source venv/bin/activate

# Install dependencies
make install-dev
# OR manually: pip install -e ".[dev]"

2. Run Local Tests (CI/CD Checks):

# IMPORTANT: Always use the Makefile targets to ensure correct venv usage!

# Run all linters (same as CI/CD)
make lint

# Run all checks (linters + tests)
make check

# Individual checks
make ruff        # Linting
make black       # Code formatting check
make yamllint    # YAML linting
make mypy        # Type checking
make pytest      # Unit tests

# Auto-format code
make format

3. Development Notes:

• ⚠️ Always activate the venv before running tests (source venv/bin/activate)
• ✅ Use make lint instead of running tools directly - ensures venv usage
• ✅ CI/CD runs the same checks as make lint - local = CI/CD
• 🔧 All linters are pinned to specific versions for consistency
• 📝 See Makefile for all available targets

Read the Architecture Documentation before contributing.

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License

MIT License - See LICENSE file for details.

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Credits

Developed by Simon Lauger

Inspired by: pulp-admin, reposync, aptly, apt-mirror, bandersnatch

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📦 Container Images: ghcr.io/slauger/chantal:latest

📚 Documentation: https://slauger.github.io/chantal/

🐛 Issues: https://github.com/slauger/chantal/issues