add git module

Author: yeoldegrove

src/python_gardenlinux_lib/git/__init__.py

@@ -0,0 +1,3 @@
+from .git import get_git_root
+
+__all__ = ['get_git_root']

src/python_gardenlinux_lib/git/git.py

@@ -0,0 +1,22 @@
+import subprocess
+from pathlib import Path
+import sys
+
+from ..logging import Logger
+
+def get_git_root(logger=None):
+    """Get the root directory of the current Git repository.
+    
+    Args:
+        logger: Optional logger instance. If not provided, will use module's logger.
+    """
+    log = logger or Logger.get_logger("gardenlinux.git")
+    
+    try:
+        root_dir = subprocess.check_output(["git", "rev-parse", "--show-toplevel"], text=True).strip()
+        log.debug(f"Git root directory: {root_dir}")
+        return Path(root_dir)
+    except subprocess.CalledProcessError as e:
+        log.error("Not a git repository or unable to determine root directory.")
+        log.debug(f"Git command failed with: {e}")
+        sys.exit(1)