sal/herodo

Herodo - Rhai Script Executor for SAL

Version: 0.1.0

Herodo is a command-line utility that executes Rhai scripts with full access to the SAL (System Abstraction Layer) library. It provides a powerful scripting environment for automation and system management tasks.

Features

• Single Script Execution: Execute individual .rhai script files
• Directory Execution: Execute all .rhai scripts in a directory (recursively)
• Sorted Execution: Scripts are executed in alphabetical order for predictable behavior
• SAL Integration: Full access to all SAL modules and functions
• Error Handling: Clear error messages and proper exit codes
• Logging Support: Built-in logging with env_logger

Installation

Build the herodo binary:

cd herodo
cargo build --release

The executable will be available at target/release/herodo.

Usage

Execute a Single Script

herodo path/to/script.rhai

Execute All Scripts in a Directory

herodo path/to/scripts/

When given a directory, herodo will:

1. Recursively find all .rhai files
2. Sort them alphabetically
3. Execute them in order
4. Stop on the first error

Example Scripts

Basic Script

// hello.rhai
println("Hello from Herodo!");
let result = 42 * 2;
println("Result: " + result);

Using SAL Functions

// system_info.rhai
println("=== System Information ===");

// Check if a file exists
let config_exists = exist("/etc/hosts");
println("Config file exists: " + config_exists);

// Download a file
download("https://example.com/data.txt", "/tmp/data.txt");
println("File downloaded successfully");

// Execute a system command
let output = run("ls -la /tmp");
println("Directory listing:");
println(output.stdout);

Redis Operations

// redis_example.rhai
println("=== Redis Operations ===");

// Set a value
redis_set("app_status", "running");
println("Status set in Redis");

// Get the value
let status = redis_get("app_status");
println("Current status: " + status);

Available SAL Functions

Herodo provides access to all SAL modules through Rhai:

• File System: exist(), mkdir(), delete(), file_size()
• Downloads: download(), download_install()
• Process Management: run(), kill(), process_list()
• Redis: redis_set(), redis_get(), redis_del()
• PostgreSQL: Database operations and management
• Network: HTTP requests, SSH operations, TCP connectivity
• Virtualization: Container operations with Buildah and Nerdctl
• Text Processing: String manipulation and template rendering
• And many more...

Error Handling

Herodo provides clear error messages and appropriate exit codes:

• Exit Code 0: All scripts executed successfully
• Exit Code 1: Error occurred (file not found, script error, etc.)

Logging

Enable detailed logging by setting the RUST_LOG environment variable:

RUST_LOG=debug herodo script.rhai

Testing

Run the test suite:

cd herodo
cargo test

The test suite includes:

• Unit tests for core functionality
• Integration tests with real script execution
• Error handling scenarios
• SAL module integration tests

Dependencies

• rhai: Embedded scripting language
• env_logger: Logging implementation
• sal: System Abstraction Layer library

License

Apache-2.0