APT CommandRunner Migration (Issue #20 Part 1)

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Summary

Complete APT package manager migration from CommandBuilder to CommandRunner interface, achieving unified testable command execution architecture.

This is Part 1 of Issue #20 - CommandRunner Pattern Implementation

Scope

• ✅ APT package manager only - Complete CommandRunner migration
• ✅ Constructor standardization - Clear production vs testing patterns
• ✅ Utility function refactoring - Convert functions to methods for better encapsulation
• ✅ Legacy cleanup - Remove CommandBuilder files
• ✅ Documentation updates - Reflect new architecture

Technical Implementation

APT CommandRunner Migration

• Replace all exec.Command calls with CommandRunner interface
• Automatic LC_ALL=C handling for consistent English output
• Built-in interactive mode support via RunInteractive()
• Dependency injection for comprehensive testing

Constructor Standardization

• NewPackageManager() - Production use with default CommandRunner
• NewPackageManagerWithCustomRunner() - Testing use with mock CommandRunner
• Clear naming convention eliminates confusion

Encapsulation Improvements

Convert utility functions to methods:

• ParseFindOutput(msg, opts, runner) → (a *PackageManager) ParseFindOutput(msg, opts)
• getPackageStatus(packages, opts, runner) → (a *PackageManager) getPackageStatus(packages, opts)
• runDpkgQuery(packageNames, opts, runner) → (a *PackageManager) runDpkgQuery(packageNames, opts)

Benefits: Eliminates parameter explosion through 3-4 function levels, better encapsulation using a.getRunner() directly

Acceptance Criteria

• APT migrated from CommandBuilder to CommandRunner
• Constructor naming standardized across APT and YUM
• Utility functions converted to methods for better encapsulation
• CommandBuilder legacy files removed
• Comprehensive test coverage maintained
• LC_ALL=C automatically handled
• Interactive mode works consistently
• All existing functionality preserved
• Documentation updated

Implementation Status

✅ COMPLETED by PR #26

Related Issues

• Part of Issue Implement CommandRunner pattern for unified testable package manager operations #20 - CommandRunner Pattern Implementation
• Followed by Issue Implement CommandRunner pattern for unified testable package manager operations #20-2 (Snap) and Issue Implement CommandRunner pattern for unified testable package manager operations #20-3 (Flatpak)

Testing

• All existing APT tests pass
• New CommandRunner mock tests added
• Cross-platform testing verified
• Environment variable handling tested
• Interactive mode validation completed

Priority

High Priority - Core architectural improvement that enables consistent testing patterns and better code organization.

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executeCommand Pattern Completed ✅

Additional Architecture Improvement: Successfully implemented centralized command execution pattern in APT to match YUM's proven approach.

What Was Added

• executeCommand() method: Centralized interactive/non-interactive command execution
• Code deduplication: Eliminated repeated if/else logic across 5 APT methods
• Architectural consistency: APT now matches YUM's clean pattern

Metrics

• Code reduction: From 17 to 7 direct getRunner() calls
• Pattern usage: 8 executeCommand() calls across Install, Delete, Upgrade, Clean, AutoRemove
• Zero regressions: All tests pass, full backward compatibility

Benefits

• DRY Principle: No more repeated interactive/non-interactive handling
• Maintainability: Command execution changes centralized in one method
• Consistency: APT and YUM now follow identical patterns

This completes the architectural consistency goals for Issue #20 Part 1. APT now has both CommandRunner interface AND the centralized executeCommand pattern, making it fully consistent with YUM's proven architecture.

Both APT and YUM are now similarly clean and maintainable. 🎯

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Issue #27 Completed ✅

PR #26 Successfully Merged: All CommandRunner architecture improvements have been merged to main.

Final Achievement Summary

• ✅ APT CommandRunner Migration: Complete with executeCommand pattern
• ✅ YUM Consistency: ParseFindOutput converted to method
• ✅ Code Quality: Hardcoded commands fixed, environment variables extracted
• ✅ Architecture Consistency: Both APT and YUM now follow identical patterns
• ✅ Zero Regressions: All tests pass, full backward compatibility

Metrics

• Code reduction: APT from 17 to 7 direct getRunner() calls
• Files changed: 17 files, 885 insertions, 242 deletions
• Test coverage: Maintained 100% with new CommandRunner tests
• CI status: All 16 checks passed

This completes Issue #27 and the architectural consistency goals for Issue #20 Part 1.

Next: Issues #28 (Snap) and #29 (Flatpak) for complete CommandRunner migration.