Project Configuration

Relevant source files

• .gitignore
• Cargo.toml

This document covers the development environment setup and project configuration files for the axio crate. It explains the structure and purpose of configuration files that control compilation, dependency management, and version control behavior.

For information about the build system and continuous integration, see Build System and CI. For details about feature gates and their impact on compilation, see Crate Configuration and Features.

Configuration File Structure

The axio project uses standard Rust project configuration with minimal additional setup requirements. The configuration is designed to support both standalone development and integration into larger systems like ArceOS.

Project Configuration Overview

flowchart TD
subgraph subGraph4["Ignored Files"]
    TARGET["/target"]
    VSCODE["/.vscode"]
    DSSTORE[".DS_Store"]
    LOCK["Cargo.lock"]
end
subgraph subGraph3["External Links"]
    REPO["repository URL"]
    DOCS["documentation URL"]
    HOME["homepage URL"]
end
subgraph subGraph2["Build Configuration"]
    FEATURES["Features Section"]
    DEPS["Dependencies Section"]
    DEFAULT["default = []"]
    ALLOC["alloc = []"]
end
subgraph subGraph1["Package Metadata"]
    NAME["name = axio"]
    VERSION["version = 0.1.1"]
    EDITION["edition = 2021"]
    DESC["description"]
    LICENSE["Triple License"]
end
subgraph subGraph0["Project Root"]
    CARGO["Cargo.tomlMain Configuration"]
    GIT[".gitignoreVersion Control"]
end

CARGO --> DEPS
CARGO --> FEATURES
CARGO --> NAME
CARGO --> REPO
CARGO --> VERSION
FEATURES --> ALLOC
FEATURES --> DEFAULT
GIT --> DSSTORE
GIT --> LOCK
GIT --> TARGET
GIT --> VSCODE

Sources: Cargo.toml(L1 - L20)  .gitignore(L1 - L5) 

Cargo.toml Configuration

The main project configuration is contained in Cargo.toml, which defines package metadata, dependencies, and feature flags.

Package Metadata

The package section defines essential project information and publishing configuration:

Sources: Cargo.toml(L1 - L12) 

Repository and Documentation Links

The project maintains links to external resources:

• Repository: https://github.com/arceos-org/axio - Source code location
• Homepage: https://github.com/arceos-org/arceos - Parent project
• Documentation: https://docs.rs/axio - Published API documentation

These links connect the crate to the broader ArceOS ecosystem while maintaining independent documentation.

Sources: Cargo.toml(L8 - L10) 

Feature Configuration

flowchart TD
subgraph subGraph2["Available Functionality"]
    BASIC["Basic I/O TraitsRead, Write, Seek"]
    DYNAMIC["Dynamic OperationsVec-based methods"]
end
subgraph subGraph1["Compilation Modes"]
    MINIMAL["Minimal BuildNo Features"]
    ENHANCED["Enhanced Build--features alloc"]
end
subgraph subGraph0["Feature Definition"]
    DEFAULT["default = []"]
    ALLOC["alloc = []"]
end

ALLOC --> ENHANCED
DEFAULT --> MINIMAL
ENHANCED --> BASIC
ENHANCED --> DYNAMIC
MINIMAL --> BASIC

Sources: Cargo.toml(L14 - L16) 

The feature configuration uses an intentionally minimal approach:

• default = []: No features enabled by default, ensuring maximum compatibility
• alloc = []: Empty feature flag that enables alloc crate integration through conditional compilation

This design allows the crate to function in the most constrained environments while providing enhanced functionality when allocation is available.

Dependencies

The dependency configuration maintains minimal external requirements:

flowchart TD
subgraph subGraph2["Functionality Provided"]
    ERROR_TYPES["Error TypesAxError, AxResult"]
    COLLECTIONS["CollectionsVec, String"]
end
subgraph subGraph1["Conditional Dependencies"]
    ALLOC_CRATE["alloc crateFeature-gated"]
end
subgraph subGraph0["Direct Dependencies"]
    AXERRNO["axerrno = 0.1Error Handling"]
end

ALLOC_CRATE --> COLLECTIONS
AXERRNO --> ERROR_TYPES

Sources: Cargo.toml(L18 - L19) 

The single required dependency axerrno = "0.1" provides standardized error types compatible with the ArceOS ecosystem. The alloc crate dependency is implicit and controlled through feature gates rather than explicit declaration.

Git Configuration

The .gitignore file excludes development artifacts and environment-specific files from version control.

Ignored File Categories

Sources: .gitignore(L1 - L4) 

Version Control Strategy

flowchart TD
subgraph subGraph2["Git Repository"]
    REPO["Version Control"]
end
subgraph subGraph1["Ignored Files"]
    TARGET["Build Output/target"]
    EDITOR["Editor Config/.vscode"]
    SYSTEM["System Files.DS_Store"]
    LOCK["Lock FileCargo.lock"]
end
subgraph subGraph0["Tracked Files"]
    SOURCE["Source Codesrc/*.rs"]
    CONFIG["ConfigurationCargo.toml"]
    DOCS["DocumentationREADME.md"]
    CI["CI Configuration.github/"]
end

CI --> REPO
CONFIG --> REPO
DOCS --> REPO
EDITOR --> REPO
LOCK --> REPO
SOURCE --> REPO
SYSTEM --> REPO
TARGET --> REPO

Sources: .gitignore(L1 - L4) 

The exclusion of Cargo.lock follows Rust library conventions, allowing downstream consumers to resolve their own dependency versions. Build artifacts in /target are excluded to avoid repository bloat, while editor-specific configurations are ignored to support diverse development environments.

Development Environment Setup

The minimal configuration requirements enable straightforward development setup:

1. Rust Toolchain: Edition 2021 or later required
2. Feature Testing: Use cargo build --features alloc to test enhanced functionality
3. Editor Support: Any Rust-compatible editor; VS Code configurations are gitignored
4. Target Testing: Use cargo build --target <target> for cross-compilation verification

The configuration supports both local development and integration into larger build systems without requiring environment-specific modifications.

Sources: Cargo.toml(L1 - L20)  .gitignore(L1 - L5)