Patched code sample

# SECURE: Safe GitPython usage with proper validation
import git
import os
import tempfile
import shutil
import subprocess
import logging

logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

class SecureGitManager:
    """Secure wrapper for GitPython operations."""
    
    def __init__(self):
        # SECURITY: Use system git executable path explicitly
        self.git_executable = self._find_system_git()
        
    def _find_system_git(self) -> str:
        """Find and validate system git executable."""
        system_paths = [
            '/usr/bin/git',
            '/usr/local/bin/git',
            'C:\\Program Files\\Git\\bin\\git.exe'
        ]
        
        for path in system_paths:
            if os.path.isfile(path):
                return path
        
        git_path = shutil.which('git')
        if git_path:
            return git_path
            
        raise RuntimeError("No valid git executable found")
    
    def _validate_repo_url(self, repo_url: str) -> bool:
        """Validate repository URL for security."""
        import re
        allowed_patterns = [
            r'^https://github\.com/[\w\-\.]+/[\w\-\.]+\.git$',
            r'^https://gitlab\.com/[\w\-\.]+/[\w\-\.]+\.git$'
        ]
        return any(re.match(pattern, repo_url) for pattern in allowed_patterns)
    
    def safe_clone_and_process(self, repo_url: str):
        """Safely clone and process repository."""
        
        # SECURITY: Validate repository URL
        if not self._validate_repo_url(repo_url):
            logger.error(f"Invalid repository URL: {repo_url}")
            return None
        
        # SECURITY: Use temporary directory
        with tempfile.TemporaryDirectory() as temp_dir:
            local_path = os.path.join(temp_dir, 'repo')
            
            try:
                # SECURITY: Configure git to use system executable
                git.Git().update_environment(GIT_PYTHON_GIT_EXECUTABLE=self.git_executable)
                
                # SECURITY: Clone with depth limit
                repo = git.Repo.clone_from(
                    repo_url, 
                    local_path,
                    depth=1,
                    single_branch=True
                )
                
                # SECURITY: Process files safely without execution
                self._process_repository_safely(repo, local_path)
                
                return repo
                
            except Exception as e:
                logger.error(f"Git operation failed: {e}")
                return None
    
    def _process_repository_safely(self, repo, local_path: str):
        """Process repository files safely without execution."""
        allowed_extensions = ['.md', '.txt', '.json']
        
        for item in repo.tree().traverse():
            if item.type == 'blob':
                file_path = os.path.join(local_path, item.path)
                
                # SECURITY: Only process safe file types, never execute
                if any(file_path.endswith(ext) for ext in allowed_extensions):
                    try:
                        with open(file_path, 'r', encoding='utf-8', errors='ignore') as f:
                            content = f.read(1024)  # Limit read size
                            logger.info(f"Processed file: {item.path}")
                    except Exception as e:
                        logger.warning(f"Could not process {item.path}: {e}")