Update README to reflect current implementation

- Updated line count from ~260 to ~500 lines
- Removed thiserror dependency reference (only anyhow now)
- Added AptConfig documentation and configuration options
- Updated API documentation with all new methods
- Added configuration usage examples
- Fixed rollback claim (now implemented, not missing)
- Added configuration_usage example reference
- All examples and tests verified working

README.md

@@ -11,8 +11,8 @@ This library provides a simple transaction interface that mimics DNF's imperativ
 - **Simple transaction interface**: `add_package()`, `resolve()`, `commit()`, `rollback()`
 - **DNF-like API**: Easy to port from rpm-ostree
 - **Version-based rollback**: Track versions and restore previous states
-- **Minimal dependencies**: Only `anyhow` and `thiserror`
-- **~260 lines total**: Focused and maintainable
+- **Minimal dependencies**: Only `anyhow`
+- **~500 lines total**: Focused and maintainable
 
 ## Quick Start
 
@@ -50,17 +50,28 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
 ```rust
 pub struct AptTransaction {
     packages: Vec<String>,
+    newly_installed: HashSet<String>,  // packages that weren't installed before
+    upgraded: HashMap<String, String>, // package -> old_version for upgrades
+    config: AptConfig,  // APT configuration options
 }
 
 impl AptTransaction {
-    pub fn new() -> Result<Self>;           // Create new transaction
+    pub fn new() -> Result<Self>;                    // Create new transaction (default config)
+    pub fn with_config(config: AptConfig) -> Result<Self>;  // Create with custom config
+    pub fn for_testing() -> Result<Self>;            // Create for testing (dry run)
     pub fn add_package(&mut self, name: &str) -> Result<()>;  // Add package
-    pub fn resolve(&self) -> Result<()>;    // Resolve dependencies
-    pub fn commit(&mut self) -> Result<()>; // Commit transaction
-    pub fn rollback(&self) -> Result<()>;   // Rollback transaction
-    pub fn packages(&self) -> &[String];    // Get package list
-    pub fn changed_packages(&self) -> Vec<String>; // Get changed packages
-    pub fn is_empty(&self) -> bool;         // Check if empty
+    pub fn resolve(&self) -> Result<()>;             // Resolve dependencies
+    pub fn commit(&mut self) -> Result<()>;          // Commit transaction
+    pub fn rollback(&self) -> Result<()>;            // Rollback transaction
+    pub fn packages(&self) -> &[String];             // Get package list
+    pub fn changed_packages(&self) -> Vec<String>;   // Get changed packages
+    pub fn is_empty(&self) -> bool;                  // Check if empty
+    pub fn config(&self) -> &AptConfig;              // Get configuration
+    pub fn set_config(&mut self, config: AptConfig); // Update configuration
+    pub fn enable_dry_run(&mut self);                // Enable dry run mode
+    pub fn disable_dry_run(&mut self);               // Disable dry run mode
+    pub fn enable_quiet(&mut self);                  // Enable quiet mode
+    pub fn disable_quiet(&mut self);                 // Disable quiet mode
 }
 ```
 
@@ -73,6 +84,23 @@ pub fn is_package_installed(name: &str) -> Result<bool>;        // Check install
 pub fn get_package_info(name: &str) -> Result<AptPackage>;      // Get package info
 ```
 
+### Configuration
+
+```rust
+pub struct AptConfig {
+    pub no_install_recommends: bool,  // Don't install recommended packages
+    pub no_install_suggests: bool,    // Don't install suggested packages
+    pub assume_yes: bool,             // Assume yes to all prompts
+    pub quiet: bool,                  // Quiet output
+    pub dry_run: bool,                // Dry run mode (don't actually execute)
+}
+
+impl AptConfig {
+    pub fn new() -> Self;             // Create with default values
+    pub fn for_testing() -> Self;     // Create for testing (dry run + quiet)
+}
+```
+
 ## Installation
 
 Add to your `Cargo.toml`:
@@ -96,7 +124,7 @@ apt-wrapper = "0.1.0"
 2. **Import the crate** in your Rust code:
 
 ```rust
-use apt_wrapper::{AptTransaction, init, search_packages, is_package_installed};
+use apt_wrapper::{AptTransaction, AptConfig, init, search_packages, is_package_installed};
 ```
 
 3. **Initialize the library** before use:
@@ -117,6 +145,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
 The crate provides these main components:
 
 - **`AptTransaction`**: Main transaction interface for package operations
+- **`AptConfig`**: Configuration options for APT behavior
 - **`init()`**: Initialize the library (required before use)
 - **`search_packages()`**: Search for available packages
 - **`is_package_installed()`**: Check if a package is installed
@@ -142,7 +171,7 @@ fn example() -> Result<()> {
 Here's a complete example of using the crate:
 
 ```rust
-use apt_wrapper::{AptTransaction, init, search_packages, is_package_installed};
+use apt_wrapper::{AptTransaction, AptConfig, init, search_packages, is_package_installed};
 use anyhow::Result;
 
 fn main() -> Result<()> {
@@ -241,6 +270,30 @@ tx.rollback()?;
 println!("Changed packages: {:?}", tx.changed_packages());
 ```
 
+### Configuration Options
+
+```rust
+use apt_wrapper::{AptTransaction, AptConfig};
+
+// Create with custom configuration
+let config = AptConfig {
+    no_install_recommends: true,
+    no_install_suggests: true,
+    assume_yes: true,
+    quiet: false,
+    dry_run: true,
+};
+
+let mut tx = AptTransaction::with_config(config)?;
+
+// Or modify configuration at runtime
+tx.enable_dry_run();
+tx.enable_quiet();
+
+// For testing
+let mut test_tx = AptTransaction::for_testing()?;
+```
+
 ## Testing
 
 ```bash
@@ -251,6 +304,7 @@ cargo test
 
 ```bash
 cargo run --example simple_usage
+cargo run --example configuration_usage
 ```
 
 ## Design Philosophy
@@ -260,14 +314,14 @@ This wrapper is designed to be:
 1. **Simple**: Minimal API surface, easy to understand
 2. **Focused**: Only what's needed for apt-ostree porting
 3. **DNF-like**: Familiar interface for rpm-ostree developers
-4. **Minimal**: ~260 lines total, no complex abstractions
+4. **Minimal**: ~500 lines total, no complex abstractions
 
 ## Differences from DNF
 
 - **APT is declarative**: Dependencies are resolved automatically
 - **No complex repo management**: APT uses simple text files
 - **Simpler error handling**: APT provides clear error messages
-- **No transaction rollback**: APT doesn't have built-in rollback
+- **Transaction rollback**: Implemented two-phase rollback (remove new, downgrade upgraded)
 
 ## OSTree Integration