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provisioning-platform/prov-ecosystem/crates/backup/IMPLEMENTATION_SUMMARY.md

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Backup Module Implementation Summary

Overview

A complete multi-backend backup management system has been successfully implemented as part of the prov-ecosystem. The module provides a unified interface for backup operations across 5 different backend systems with full support for configuration, scheduling, filtering, and dependency management.

Completed Components

1. Core Infrastructure

Error Handling (src/error.rs)

  • BackupError enum with 14 error variants
  • BackupResult<T> type alias for simplified error handling
  • Factory methods for common errors
  • Support for error conversion from standard Rust types

Type System (src/types.rs)

  • Snapshot: Backup snapshot metadata
  • BackupReport: Backup operation results
  • PruneReport: Retention policy execution results
  • CheckReport: Repository verification results
  • RepositoryStats: Repository statistics
  • RestoreOptions: Restore operation configuration
  • BackupStatus: Backup operation states
  • DependencyInfo: Binary dependency information
  • InstallGuide & InstallMethod: Installation instructions

Backend Types (src/backend_type.rs)

  • BackendType enum: restic, borg, tar, cpio, rsync
  • RepositoryType enum: local, S3, SFTP, REST, B2
  • InitSystemType enum: auto, systemd, launchd, cron, openrc
  • Type conversion and feature detection methods

2. Backend Implementations

Trait Definition (src/backend.rs)

  • BackupBackend async trait with 9 methods:
    • name() / binary_name(): Identification
    • is_available(): Backend availability check
    • install_guide(): Installation instructions
    • info(): Backend information
    • init_repository(): Repository initialization
    • backup(): Execute backup operation
    • list_snapshots(): List available snapshots
    • restore(): Restore from snapshot
    • prune(): Apply retention policies
    • check(): Verify repository integrity
    • stats(): Get repository statistics

Restic Backend (src/backends/restic.rs)

  • Full async trait implementation
  • Incremental, deduplicating backups with encryption
  • S3, SFTP, REST, and B2 remote support
  • JSON-based snapshot parsing
  • Environment variable configuration
  • Retention policy application
  • Repository integrity checking

BorgBackup Backend (src/backends/borg.rs)

  • Complete async trait implementation
  • Archive naming with tags and timestamps
  • Encryption via repokey
  • JSON-lines snapshot parsing
  • Compression and deduplication support
  • Retention policy application
  • Repository checking and statistics

TAR Backend (src/backends/tar.rs)

  • Gzip compression support
  • Directory-based snapshot storage
  • Include/exclude pattern support
  • Archive integrity verification
  • Statistics collection
  • Simple, standard format

CPIO Backend (src/backends/cpio.rs)

  • CPIO archive format support
  • Find-based file enumeration
  • Pattern-based exclusion
  • Archive integrity checking
  • Portable archive format
  • Directory restoration

Rsync Backend (src/backends/rsync.rs)

  • Fast incremental file synchronization
  • Archive mode with metadata preservation
  • Remote and local support
  • Exclusion pattern support
  • Directory-based snapshots with timestamps
  • Retention policy with directory cleanup
  • Directory size calculation

3. Configuration System

Configuration (src/config.rs)

  • BackupConfig: Main configuration with validation
  • RepositoryConfig: Repository settings with env vars
  • BackupTarget: Backup target definition
  • RetentionPolicy: Flexible retention configuration
  • ScheduleConfig: Schedule automation settings
  • BackupHooks: Pre/post backup hooks
  • NotificationConfig: Notification settings
  • Multi-format support: TOML, YAML, JSON
  • Comprehensive validation

4. Supporting Modules

File Filtering (src/filter.rs)

  • FileFilter struct for pattern matching
  • Glob-to-regex conversion
  • Pattern support: *, **, ?, [...]
  • Include/exclude pattern evaluation
  • Comprehensive test coverage

Dependency Checking (src/dependency.rs)

  • DependencyChecker for backend availability
  • Binary detection in PATH
  • Version string extraction
  • Installation guide provision
  • Per-backend implementation

Schedule Generation (src/schedule.rs)

  • ScheduleGenerator for schedule automation
  • Systemd timer generation
  • Launchd plist generation
  • Cron expression support
  • OpenRC init script generation
  • Cron-to-systemd calendar conversion
  • Init system auto-detection

Library Integration (src/lib.rs)

  • Unified module organization
  • Public API re-exports
  • Comprehensive documentation with examples
  • Quick start guide
  • Configuration format documentation

5. Schemas

KCL Schema (schemas/backup/main.k)

  • Type-safe configuration schema
  • Enumerations for all option types
  • Nested structure definitions
  • Complete inline documentation
  • Integration-ready format

Main Ecosystem Schema (schemas/main.k)

  • Integration with existing ecosystem
  • backup_config field in ProvEcosystemConfig
  • Import statements for backup module

6. Documentation

README.md

  • Feature overview with comparison table
  • Installation instructions
  • Quick start guide with examples
  • Complete configuration reference
  • API documentation
  • Usage examples for common tasks
  • Performance considerations
  • Testing instructions

INTEGRATION.md

  • Standalone usage patterns
  • CLI tool implementation example
  • Provctl integration guide
  • Provisioning system integration
  • KCL configuration examples
  • Automation workflows
  • Testing integration patterns
  • Monitoring and alerting integration

7. Build Configuration

Cargo.toml

  • Workspace integration
  • Dependencies: serde, tokio, async-trait, chrono, uuid, regex, glob, which
  • Dev dependencies for testing
  • Proper metadata and documentation links

Root Workspace (Cargo.toml)

  • Added backup crate to members list
  • Integrated with workspace dependencies

Architecture Highlights

Design Patterns

  • Trait-based abstraction: Common interface for all backends
  • Configuration-driven: TOML/YAML/JSON configuration
  • Async-first: Full tokio async support
  • Error handling: Typed error enum with context
  • Type safety: Serde-based serialization with validation

Extensibility

  • Easy to add new backends: Implement BackupBackend trait
  • Custom configuration options via env_vars and options
  • Hook system for pre/post operations
  • Pluggable notification system

Multi-Init System Support

  • Systemd timers (Linux)
  • Launchd agents (macOS)
  • Cron scheduling (universal)
  • OpenRC init scripts (lightweight Linux)
  • Auto-detection based on system

Repository Types Supported

  • Local filesystem: Direct path access
  • S3: AWS S3 compatibility
  • SFTP: Remote SSH access
  • REST: Server-based backends
  • B2: Backblaze B2 cloud storage

Key Features

  1. Config-Driven: All settings via TOML/YAML/JSON
  2. Multi-Backend: 5 different backup systems supported
  3. Smart Scheduling: Automatic schedule generation for all systems
  4. Dependency Management: Verify and guide tool installation
  5. Pattern Matching: Glob-based include/exclude patterns
  6. Retention Policies: Flexible snapshot preservation
  7. Hooks: Pre/post backup operations
  8. Notifications: Customizable alerts
  9. Repository Checks: Integrity verification
  10. Statistics: Size and snapshot tracking
  11. Async Operations: Non-blocking backup operations
  12. Type-Safe: Leverages Rust's type system

Testing

All modules include test coverage:

  • Unit tests for each backend
  • Pattern matching tests
  • Configuration validation tests
  • Type conversion tests
  • Schedule generation tests
  • Dependency detection tests

Integration Points

With Provctl

  • Backup subcommands
  • Configuration management
  • Repository initialization
  • Backup execution
  • Status monitoring

With Provisioning System

  • KCL configuration support
  • Init system integration
  • Service management
  • Schedule automation
  • Environment variable management

Standalone

  • Library for custom applications
  • Direct async/await usage
  • Configuration file management
  • Direct backend instantiation

File Structure

crates/backup/
├── Cargo.toml                 # Package manifest
├── README.md                  # User documentation
├── INTEGRATION.md             # Integration guide
├── IMPLEMENTATION_SUMMARY.md  # This file
└── src/
    ├── lib.rs                 # Library root
    ├── error.rs               # Error types
    ├── types.rs               # Core types
    ├── backend.rs             # Backend trait
    ├── backend_type.rs        # Type enumerations
    ├── config.rs              # Configuration
    ├── filter.rs              # File filtering
    ├── dependency.rs          # Dependency checking
    ├── schedule.rs            # Schedule generation
    └── backends/
        ├── mod.rs             # Backend module
        ├── restic.rs          # Restic implementation
        ├── borg.rs            # BorgBackup implementation
        ├── tar.rs             # TAR implementation
        ├── cpio.rs            # CPIO implementation
        └── rsync.rs           # Rsync implementation

schemas/
├── main.k                     # Ecosystem schema
└── backup/
    └── main.k                 # Backup schema

Usage Example

use backup::config::BackupConfig;
use backup::backends::ResticBackend;
use backup::backend::BackupBackend;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Load configuration
    let config = BackupConfig::from_toml("backup.toml")?;
    config.validate()?;

    // Create backend
    let backend = ResticBackend::new(None);

    // Verify availability
    if backend.is_available().await? {
        // Initialize repository
        backend.init_repository(&config.repository).await?;

        // Run backups
        for target in config.targets {
            let report = backend.backup(&target).await?;
            println!("Backed up {} files", report.files_processed);
        }

        // Apply retention
        backend.prune(&config.retention).await?;

        // Verify integrity
        let check = backend.check().await?;
        if check.valid {
            println!("Repository is valid");
        }
    }

    Ok(())
}

Configuration Example

version = "1.0"
name = "production-backup"
backend = "restic"

[repository]
type = "s3"
path = "s3://my-bucket/backups"
password_file = "/etc/backup/password"

[[targets]]
name = "database"
paths = ["/var/lib/postgresql"]
excludes = ["pg_wal/*"]
tags = ["production"]

[retention]
keep_daily = 7
keep_weekly = 4
keep_monthly = 12

[schedule]
enabled = true
cron = "0 2 * * *"
init_system = "systemd"

Performance Characteristics

  • Restic: Slowest (encryption overhead) but most features
  • BorgBackup: Fast with excellent compression
  • Rsync: Fastest for incremental transfers
  • TAR: Fast for full backups
  • CPIO: Portable, moderate performance

Limitations

  • TAR/CPIO: No incremental support
  • CPIO: Limited metadata preservation
  • Rsync: No deduplication
  • Schedule generation: Simple patterns only (complex expressions need manual adjustment)

Next Steps for Integration

  1. Install required backends: restic, borg, tar, cpio, rsync
  2. Create backup configuration files using provided examples
  3. Test with dry runs
  4. Set up scheduling with init system
  5. Configure monitoring and alerting
  6. Document recovery procedures
  7. Test restore procedures regularly

Conclusion

The backup module provides a production-ready, extensible backup management system with:

  • 5 different backup backends
  • Configuration-driven design
  • Full async support
  • Comprehensive documentation
  • Integration examples
  • Type-safe error handling
  • Flexible scheduling
  • Multi-init system support

It can be used standalone as a library, integrated with Provctl, or integrated into the Provisioning system.