fix: raise original error message alongside generic GitError message (o…

…penlawlibrary#539)

taf/exceptions.py

@@ -1,4 +1,5 @@
 from typing import List, Optional, Any, Tuple
+import subprocess
 
 
 class TAFError(Exception):
@@ -28,14 +29,14 @@ def __init__(
         self,
         repo: Any,
         command: Optional[str] = None,
-        error: Optional[Exception] = None,
+        error: Optional[subprocess.CalledProcessError] = None,
         message: Optional[str] = None,
     ):
         if message is None:
             if command is not None:
                 message = f"error occurred while executing {command}"
                 if error is not None:
-                    message = f"{message}:\n{str(error)}"
+                    message = f"{message}:\n{str(error.stdout)}"
             elif error is not None:
                 message = str(error)
             else:

taf/git.py

@@ -872,7 +872,7 @@ def commit(self, message: str) -> str:
                 return self._git("rev-parse HEAD")
             except subprocess.CalledProcessError as e:
                 raise GitError(
-                    repo=self, message=f"could not commit changes due to:\n{e}"
+                    repo=self, message=f"could not commit changes due to:\n{e}", error=e
                 )
         else:
             raise NothingToCommitError(repo=self, message="No changes to commit")