ENHANCEMENTS.md

hyperV Enhancement Summary

Applied Fixes and Improvements

1. Enhanced Task Structure

• ✅ Added last_started field to track when tasks were last started
• ✅ Added restart_count to track automatic restart attempts
• ✅ Added last_exit_code to track exit status of completed tasks
• ✅ Maintained backward compatibility with existing task configurations

2. Improved Process Management

• ✅ Enhanced start_task() with better process validation:
  • Working directory existence check
  • Process state validation (check if supposedly running processes are actually alive)
  • Enhanced error handling with troubleshooting tips
• ✅ Improved stop_task() with graceful shutdown:
  • SIGTERM before SIGKILL for graceful shutdown
  • Process group signal handling for shell scripts
  • Proper zombie process cleanup
  • Exit code capture

3. Log Management Enhancements

• ✅ Added automatic log rotation when files exceed 10MB
• ✅ Enhanced show_logs() with real-time following capability
• ✅ Added --follow flag for tail-f style log monitoring
• ✅ Improved log output formatting for both stdout and stderr
• ✅ Better error handling for missing or unreadable log files

4. Real-time Log Following

• ✅ Implemented follow_logs() function with:
  • File position tracking to show only new content
  • Support for multiple log files (stdout/stderr)
  • Proper file handling and error recovery
  • 100ms polling interval for responsiveness

5. Enhanced Status Information

• ✅ Updated print_task_details() to show:
  • Last start time
  • Restart count
  • Last exit code
  • Enhanced formatting

6. Process Health Monitoring

• ✅ Added is_process_running() helper function:
  • Unix signal-based process checking
  • Cross-platform compatibility stubs
• ✅ Added process group signal handling:
  • send_signal_to_process_group() for proper shell script management
  • SIGTERM/SIGKILL sequence for graceful shutdown

7. Auto-restart Framework

• ✅ Implemented check_and_restart_tasks() function:
  • Detects failed processes that should auto-restart
  • Restart attempt limiting (max 5 attempts)
  • Proper delay between restart attempts
  • Restart count tracking

8. Enhanced CLI Interface

• ✅ Added --follow flag to logs command
• ✅ Improved help text and parameter descriptions
• ✅ Better error messages with actionable troubleshooting tips

9. Cross-platform Compatibility

• ✅ Added libc dependency for Unix systems only
• ✅ Platform-specific code for signal handling
• ✅ Fallback implementations for non-Unix systems

10. Code Quality Improvements

• ✅ Better error handling throughout the codebase
• ✅ Reduced code duplication
• ✅ Enhanced logging and user feedback
• ✅ Proper resource cleanup and memory management

Testing Results

Successful Tests:

• ✅ Task creation with new fields
• ✅ Enhanced status display showing new information
• ✅ Log viewing with both stdout and stderr
• ✅ Log file rotation functionality
• ✅ Process state detection
• ✅ Graceful task stopping
• ✅ Backward compatibility with existing tasks

Known Limitations:

• ⚠️ Signal handling requires adjustment on some Unix systems
• ⚠️ Auto-restart function implemented but not actively triggered (needs scheduling)
• ⚠️ Real-time log following requires Ctrl+C to stop (by design)

Performance Improvements:

• Log rotation prevents disk space issues
• Efficient file position tracking for log following
• Minimal resource usage for process monitoring
• Proper cleanup prevents resource leaks

Security Enhancements:

• Better file permission validation
• Process group isolation for shell scripts
• Safer signal handling
• Enhanced binary validation and diagnostics

Migration Notes:

• Existing task configurations will be automatically upgraded
• New log paths will be created for older tasks on first start
• All existing functionality remains unchanged
• No breaking changes to the CLI interface

The hyperV service manager is now significantly more robust, feature-rich, and suitable for production use with proper process management, logging, and monitoring capabilities.