fix(git): improves git error checking in get_commits

older version of git did not have the --author-date-order argument so it is best to report that kind of error.

commitizen/exceptions.py

@@ -27,6 +27,7 @@ class ExitCode(enum.IntEnum):
     NOT_ALLOWED = 20
     NO_INCREMENT = 21
     UNRECOGNIZED_CHARACTERSET_ENCODING = 22
+    GIT_COMMAND_ERROR = 23
 
 
 class CommitizenException(Exception):
@@ -153,3 +154,7 @@ class NotAllowed(CommitizenException):
 
 class CharacterSetDecodeError(CommitizenException):
     exit_code = ExitCode.UNRECOGNIZED_CHARACTERSET_ENCODING
+
+
+class GitCommandError(CommitizenException):
+    exit_code = ExitCode.GIT_COMMAND_ERROR

commitizen/git.py

@@ -6,6 +6,7 @@
 from typing import List, Optional
 
 from commitizen import cmd
+from commitizen.exceptions import GitCommandError
 
 UNIX_EOL = "\n"
 WINDOWS_EOL = "\r\n"
@@ -118,6 +119,8 @@ def get_commits(
     else:
         command = f"{git_log_cmd} {end}"
     c = cmd.run(command)
+    if c.return_code != 0:
+        raise GitCommandError(c.err)
     if not c.out:
         return []
 

docs/exit_codes.md

@@ -30,3 +30,4 @@ These exit codes can be found in `commitizen/exceptions.py::ExitCode`.
 | NotAllowed                  | 20        | `--incremental` cannot be combined with a `rev_range`                                                       |
 | NoneIncrementExit           | 21        | The commits found are not eligible to be bumped                                                             |
 | CharacterSetDecodeError     | 22        | The character encoding of the command output could not be determined                                        |
+| GitCommandError             | 23       | Unexpected failure while calling a git command                                                              |