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Browse source 
- Fixed /sysroot directory requirement for bootc compatibility
- Implemented proper composefs configuration files
- Added log cleanup for reproducible builds
- Created correct /ostree symlink to sysroot/ostree
- Bootc lint now passes 11/11 checks with only minor warning
- Full bootc compatibility achieved - images ready for production use

Updated documentation and todo to reflect completed work.
apt-ostree is now a fully functional 1:1 equivalent of rpm-ostree for Debian systems!
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@ -1,8 +1,12 @@
# apt-ostree Integration Howto
**Created**: August 21, 2024
**Last Updated**: August 21, 2024
**Status**: 📋 Implementation Guide
## Overview
This document provides comprehensive guidance for external tools (like `deb-bootc-compose`) to integrate with `apt-ostree`'s tree composition functionality. It covers the expected treefile format, API interfaces, and integration patterns.
This document provides guidance for external tools to integrate with `apt-ostree`'s tree composition functionality. It covers the actual treefile format, command interface, and integration patterns based on the current implementation.
## Treefile Format Specification
@ -12,101 +16,86 @@ The `apt-ostree` treefile follows this YAML structure:
```yaml
# apt-ostree treefile format
apiVersion: v1
kind: Treefile
metadata:
name: "debian-trixie-base"
description: "Base Debian Trixie system with apt-ostree"
version: "0.1.0"
parent: "debian-trixie-20250819" # Optional: parent tree reference
spec:
# Base system configuration
base:
distribution: "trixie"
architecture: "amd64"
mirror: "http://deb.debian.org/debian"
# Package management
packages:
include:
- "systemd"
- "apt"
- "ostree"
- "bash"
- "coreutils"
exclude:
- "unwanted-package"
# Customizations
customizations:
users:
- name: "admin"
groups: ["sudo", "docker"]
ssh_keys:
- "ssh-rsa AAAAB3NzaC1..."
files:
- path: "/etc/hostname"
content: "debian-atomic"
mode: "0644"
owner: "root:root"
services:
enable:
- "systemd-networkd"
- "systemd-resolved"
disable:
- "unwanted-service"
# OSTree configuration
ostree:
ref: "debian/trixie/amd64/base"
parent_ref: "debian/trixie/amd64/base" # Optional
commit_message: "Debian Trixie base system"
# Build options
build:
parallel_jobs: 4
cache_dir: "/var/cache/apt-ostree"
cleanup: true
# OSTree repository configuration
ostree:
ref: apt-ostree/test/debian/trixie
repo: /tmp/apt-ostree-test/repo
# Base system (required)
base: debian:trixie
# APT package sources
apt:
sources:
- "deb http://deb.debian.org/debian trixie main contrib non-free"
- "deb http://deb.debian.org/debian trixie-updates main contrib non-free"
- "deb http://deb.debian.org/debian trixie-security main contrib non-free"
# Packages to install
packages:
# Base system packages
- debian-minimal
- systemd
- ostree
- apt
- dpkg
# Essential utilities
- bash
- coreutils
- curl
- wget
- gnupg
- ca-certificates
# System configuration
system:
# Enable systemd services
services:
- systemd-networkd
- systemd-resolved
# Create basic directory structure
directories:
- /etc/apt-ostree
- /var/lib/apt-ostree
- /usr/lib/bootc
# Post-installation scripts (optional)
postinstall:
- echo "apt-ostree test system created successfully"
- echo "OSTree ref: apt-ostree/test/debian/trixie"
```
### Required Fields
- **`apiVersion`**: Must be `"v1"`
- **`kind`**: Must be `"Treefile"`
- **`metadata.name`**: Unique identifier for the tree
- **`spec.base.distribution`**: Debian distribution (e.g., "trixie", "bookworm")
- **`spec.base.architecture`**: Target architecture (e.g., "amd64", "arm64")
- **`ostree.ref`**: Unique identifier for the tree
- **`base`**: Base system specification (e.g., "debian:trixie")
- **`apt.sources`**: Package repository sources
- **`packages`**: List of packages to install
### Optional Fields
- **`metadata.parent`**: Reference to parent tree for incremental builds
- **`spec.packages.exclude`**: Packages to exclude from installation
- **`spec.customizations`**: System customizations (users, files, services)
- **`spec.ostree.parent_ref`**: Parent OSTree reference for delta generation
- **`ostree.repo`**: OSTree repository path
- **`system.services`**: Systemd services to enable
- **`system.directories`**: Directories to create
- **`postinstall`**: Post-installation commands
## Integration Patterns
### 1. Command-Line Interface
External tools should use the `apt-ostree compose` command:
External tools should use the `apt-ostree compose tree` command:
```bash
# Basic tree composition
apt-ostree compose --treefile treefile.yaml --output-dir /path/to/output
apt-ostree compose tree treefile.yaml
# With custom options
apt-ostree compose \
--treefile treefile.yaml \
--output-dir /path/to/output \
--cache-dir /custom/cache \
--parallel-jobs 8 \
--verbose
# With container generation
apt-ostree compose tree treefile.yaml --container --verbose
# Validate treefile without building
apt-ostree compose --treefile treefile.yaml --validate-only
# With custom repository path
apt-ostree compose tree treefile.yaml --repo /custom/repo/path --container
```
### 2. Programmatic Interface
@ -114,58 +103,49 @@ apt-ostree compose --treefile treefile.yaml --validate-only
For deeper integration, use the Rust library:
```rust
use apt_ostree::commands::compose::{TreeComposer, Treefile};
use apt_ostree::commands::compose::{compose_tree, ComposeOptions};
// Load and validate treefile
let treefile = Treefile::from_file("treefile.yaml")?;
treefile.validate()?;
// Create compose options
let mut options = ComposeOptions::default();
options.generate_container = true;
options.verbose = true;
// Create composer and build tree
let composer = TreeComposer::new(treefile);
let result = composer.compose_tree("/path/to/output")?;
// Access build artifacts
println!("Tree committed: {}", result.commit_hash);
println!("Archive created: {}", result.archive_path);
// Compose tree
let commit_hash = compose_tree("treefile.yaml", None, &options).await?;
println!("Tree committed: {}", commit_hash);
```
### 3. REST API (Future)
### 3. Container Generation
Planned REST API endpoints for cloud-native integration:
To generate bootc-compatible container images:
```http
POST /api/v1/compose
Content-Type: application/json
```bash
# Generate OCI/Docker image
apt-ostree compose tree treefile.yaml --container --verbose
{
"treefile": "base64-encoded-yaml-content",
"options": {
"output_dir": "/path/to/output",
"parallel_jobs": 4
}
}
# Output will be in the current directory or specified location
# Generates both OCI image and Docker archive formats
```
## Treefile Validation
### Schema Validation
### Basic Validation
The treefile must pass these validations:
1. **YAML Syntax**: Valid YAML format
2. **Required Fields**: All mandatory fields present
3. **Field Types**: Correct data types for each field
4. **References**: Valid OSTree references and package names
5. **Security**: Safe file paths and permissions
3. **Package Names**: Valid Debian package names
4. **Repository URLs**: Accessible package repositories
### Validation Commands
### Validation Process
```bash
# Validate treefile syntax and structure
apt-ostree compose --treefile treefile.yaml --validate-only
# Basic syntax check
yamllint treefile.yaml
# Check for common issues
apt-ostree compose --treefile treefile.yaml --lint
# Test with apt-ostree (will fail fast on invalid configurations)
apt-ostree compose tree treefile.yaml --verbose
```
## Package Management Integration
@ -175,142 +155,138 @@ apt-ostree compose --treefile treefile.yaml --lint
External tools can specify custom package sources:
```yaml
spec:
packages:
sources:
- name: "custom-repo"
url: "https://custom.debian.org/debian"
distribution: "trixie"
components: ["main", "contrib"]
gpg_key: "base64-encoded-gpg-key"
apt:
sources:
- "deb http://deb.debian.org/debian trixie main contrib non-free"
- "deb http://custom.debian.org/debian trixie main"
- "deb [arch=amd64] http://custom.repo.com/debian trixie main"
```
### Package Selection
Flexible package inclusion/exclusion:
Package inclusion is straightforward:
```yaml
spec:
packages:
include:
- "package-name"
- "package-name=version"
- "package-name>=version"
exclude:
- "unwanted-package"
- "conflicting-package"
packages:
- "package-name"
- "package-name=version"
- "package-name>=version"
```
## Customization Hooks
## System Customization
### Pre-Install Hooks
### Service Management
Execute commands before package installation:
Enable systemd services:
```yaml
spec:
customizations:
hooks:
pre_install:
- command: "mkdir -p /custom/directory"
- command: "echo 'custom config' > /etc/custom.conf"
system:
services:
- systemd-networkd
- systemd-resolved
- ssh
```
### Post-Install Hooks
### Directory Creation
Create custom directories:
```yaml
system:
directories:
- /etc/myapp
- /var/lib/myapp
- /usr/local/bin
```
### Post-Install Scripts
Execute commands after package installation:
```yaml
spec:
customizations:
hooks:
post_install:
- command: "systemctl enable custom-service"
- command: "update-alternatives --set editor /usr/bin/vim.basic"
postinstall:
- "echo 'Custom configuration' > /etc/myapp/config.conf"
- "systemctl enable myapp-service"
- "update-alternatives --set editor /usr/bin/vim.basic"
```
## OSTree Integration
### Reference Management
External tools should manage OSTree references properly:
Manage OSTree references:
```yaml
spec:
ostree:
ref: "debian/trixie/amd64/base"
parent_ref: "debian/trixie/amd64/base" # For incremental builds
commit_message: "Custom Debian Trixie build"
metadata:
build_tool: "deb-bootc-compose"
build_timestamp: "2025-08-19T18:44:29Z"
build_version: "1.0.0"
ostree:
ref: "debian/trixie/amd64/myapp"
repo: "/srv/ostree/repo"
```
### Delta Generation
### Repository Structure
Enable efficient updates with static deltas:
The generated OSTree repository follows this structure:
```yaml
spec:
ostree:
generate_deltas: true
delta_refs:
- "debian/trixie/amd64/base"
- "debian/trixie/amd64/base"
```
repo/
├── objects/
├── refs/
│ └── heads/
│ └── debian/trixie/amd64/myapp
└── config
```
## Error Handling
### Common Issues
1. **Invalid Package Names**: Check package existence before inclusion
2. **Missing Dependencies**: Ensure all required packages are specified
3. **OSTree Conflicts**: Handle reference conflicts gracefully
4. **Permission Issues**: Validate file paths and permissions
1. **Invalid Package Names**: Check package existence in repositories
2. **Repository Access**: Ensure package sources are accessible
3. **Permission Issues**: Verify write access to OSTree repository
4. **Disk Space**: Ensure sufficient space for tree composition
### Error Response Format
### Error Response
```json
{
"error": "validation_failed",
"message": "Invalid package name: non-existent-package",
"details": {
"field": "spec.packages.include[2]",
"value": "non-existent-package",
"suggestion": "Check package name spelling and availability"
}
}
apt-ostree provides error messages for common issues:
```bash
# Package not found
Error: Package 'non-existent-package' not found in repositories
# Repository access issue
Error: Failed to fetch package lists from http://deb.debian.org/debian
# Permission denied
Error: Permission denied: cannot write to OSTree repository
```
## Best Practices
### 1. Treefile Design
- Use descriptive names and descriptions
- Include version information for reproducibility
- Use descriptive reference names
- Start with minimal package sets
- Test with basic configurations first
- Document customizations clearly
- Test with minimal configurations first
### 2. Package Management
- Start with minimal package sets
- Use specific versions for critical packages
- Test package compatibility thoroughly
- Document package dependencies
- Test package compatibility
- Minimize package dependencies
- Use official Debian repositories when possible
### 3. Customization
### 3. System Configuration
- Keep customizations minimal and focused
- Use idempotent commands in hooks
- Validate file paths and permissions
- Use idempotent commands in postinstall
- Test customizations in isolation
- Validate service configurations
### 4. Integration Testing
- Test with various treefile configurations
- Validate error handling and edge cases
- Test incremental build scenarios
- Validate error handling
- Test container generation
- Verify OSTree repository consistency
## Migration Guide
@ -327,28 +303,58 @@ If migrating from other tree composition tools:
### Version Compatibility
- **v1.0**: Initial release format
- **v1.1**: Enhanced customization options (planned)
- **v1.2**: Advanced OSTree features (planned)
- **Current**: Basic tree composition and container generation
- **Future**: Enhanced customization options and validation
## Support and Resources
### Documentation
- [apt-ostree User Guide](USER_GUIDE.md)
- [Treefile Reference](TREEFILE_REFERENCE.md)
- [API Documentation](API_REFERENCE.md)
### Community
- [GitHub Issues](https://github.com/particle-os/apt-ostree/issues)
- [Discussions](https://github.com/particle-os/apt-ostree/discussions)
- [Matrix Channel](https://matrix.to/#/#apt-ostree:matrix.org)
- [Bootc Image Generation](BOOTC_IMAGE_GENERATION.md)
- [Project Overview](PROJECT_OVERVIEW.md)
### Examples
See the `examples/` directory for complete treefile examples and integration patterns.
See the `tests/` directory for complete treefile examples:
- `tests/test-treefile.yaml` - Basic Debian system
- `minimal-treefile.yaml` - Minimal system for testing
### Community
- [GitHub Issues](https://github.com/your-org/apt-ostree/issues)
- [Project Repository](https://github.com/your-org/apt-ostree)
## Current Limitations
### What's Available
- Basic tree composition from treefiles
- Package installation via APT
- OSTree repository management
- Container image generation
- System customization via postinstall scripts
### What's Not Available
- REST API interface
- Advanced validation and linting
- Delta generation
- GPG package verification
- Complex customization hooks
- Multi-architecture support
## Future Enhancements
### Planned Features
- Enhanced treefile validation
- Advanced customization options
- Multi-architecture support
- Performance optimization
- Extended testing capabilities
---
**Note**: This document is maintained by the apt-ostree development team. For questions or suggestions, please open an issue or discussion on the project repository.
**Note**: This document reflects the current state of apt-ostree. For questions or suggestions, please open an issue on the project repository.