chore(ruff): Fix common exception

Author: tony

src/libtmux/common.py

@@ -151,7 +151,7 @@ def show_environment(self) -> Dict[str, Union[bool, str]]:
             elif len(_t) == 1:
                 vars_dict[_t[0]] = True
             else:
-                raise ValueError(f"unexpected variable {_t}")
+                raise exc.VariableUnpackingError(variable=_t)
 
         return vars_dict
 
@@ -188,7 +188,7 @@ def getenv(self, name: str) -> Optional[t.Union[str, bool]]:
             elif len(_t) == 1:
                 vars_dict[_t[0]] = True
             else:
-                raise ValueError(f"unexpected variable {_t}")
+                raise exc.VariableUnpackingError(variable=_t)
 
         return vars_dict.get(name)
 
@@ -242,8 +242,8 @@ def __init__(self, *args: t.Any, **kwargs: t.Any) -> None:
             )
             stdout, stderr = self.process.communicate()
             returncode = self.process.returncode
-        except Exception as e:
-            logger.error(f"Exception for {subprocess.list2cmdline(cmd)}: \n{e}")
+        except Exception:
+            logger.exception(f"Exception for {subprocess.list2cmdline(cmd)}")
             raise
 
         self.returncode = returncode