fix(misc): various cleanup

Just went through all changes and adjusted them to the best of my
abilities. As there are no tests to claim otherwise, I believe
this is correct enough.

However, it becomes evident that it's no longer possible to just
make changes without backing them with a respective test.

Author: Byron

Diff for: git/cmd.py

@@ -36,6 +36,7 @@
 from git.compat import (
     string_types,
     defenc,
+    force_bytes,
     PY3,
     bchr,
     # just to satisfy flake8 on py3
@@ -69,10 +70,6 @@ def _bchr(c):
 # Documentation
 ## @{
 
-def _drop_output_handler(line):
-    pass
-
-
 def handle_process_output(process, stdout_handler, stderr_handler, finalizer):
     """Registers for notifications to lean that process output is ready to read, and dispatches lines to
     the respective line handlers. We are able to handle carriage returns in case progress is sent by that
@@ -83,13 +80,6 @@ def handle_process_output(process, stdout_handler, stderr_handler, finalizer):
     :param stdout_handler: f(stdout_line_string), or None
     :param stderr_hanlder: f(stderr_line_string), or None
     :param finalizer: f(proc) - wait for proc to finish"""
-
-    log.debug('handle_process_output( process=%r, stdout_handler=%r, stderr_handler=%r, finalizer=%r'
-              % (process, stdout_handler, stderr_handler, finalizer))
-
-    if stdout_handler is None:
-        stdout_handler = _drop_output_handler
-
     fdmap = {process.stdout.fileno(): (stdout_handler, [b'']),
              process.stderr.fileno(): (stderr_handler, [b''])}
 
@@ -130,7 +120,6 @@ def _dispatch_single_line(line, handler):
     # end single line helper
 
     def _dispatch_lines(fno, handler, buf_list):
-        log.debug('fno=%d, handler=%r, buf_list=%r' % (fno, handler, buf_list))
         lc = 0
         for line in _read_lines_from_fno(fno, buf_list):
             _dispatch_single_line(line, handler)
@@ -325,23 +314,15 @@ def wait(self, stderr=b''):
             :param stderr: Previously read value of stderr, in case stderr is already closed.
             :warn: may deadlock if output or error pipes are used and not handled separately.
             :raise GitCommandError: if the return status is not 0"""
-
-            # stderr must be a bytes object as it will
-            # combined with more data from the process and
-            # decoded by the caller
             if stderr is None:
                 stderr = b''
-            elif type(stderr) == unicode:
-                stderr = stderr.encode(defenc)
-
+            stderr = force_bytes(stderr)
+            
             status = self.proc.wait()
 
             def read_all_from_possibly_closed_stream(stream):
                 try:
-                    last_stderr = stream.read()
-                    if type(last_stderr) == unicode:
-                        last_stderr = last_stderr.encode(defenc)
-                    return stderr + last_stderr
+                    return stderr + force_bytes(stream.read())
                 except ValueError:
                     return stderr or b''
 
@@ -633,8 +614,8 @@ def execute(self, command,
                          cwd=cwd,
                          bufsize=-1,
                          stdin=istream,
-                         stderr=PIPE,
-                         stdout=PIPE,
+                         stderr=PIPE, 
+                         stdout=PIPE if with_stdout else open(os.devnull, 'wb'),
                          shell=self.USE_SHELL,
                          close_fds=(os.name == 'posix'),  # unsupported on windows
                          universal_newlines=universal_newlines,

Diff for: git/ext/gitdb

@@ -570,37 +570,25 @@ def _get_fetch_info_from_stderr(self, proc, progress):
 
         progress_handler = progress.new_message_handler()
 
-        error_message = None
         stderr_text = None
 
         for line in proc.stderr:
             line = force_text(line)
             for pline in progress_handler(line):
-                if line.startswith('fatal:') or line.startswith('error:'):
-                    error_message = "Error when fetching: %s" % (line,)
-                    break
-
                 # END handle special messages
                 for cmd in cmds:
                     if len(line) > 1 and line[0] == ' ' and line[1] == cmd:
                         fetch_info_lines.append(line)
                         continue
                     # end find command code
                 # end for each comand code we know
-
-            if error_message is not None:
-                break
             # end for each line progress didn't handle
-
-        if error_message is not None:
-            stderr_text = proc.stderr.read()
-
         # end
+        if progress.error_lines():
+            stderr_text = '\n'.join(progress.error_lines())
+            
         finalize_process(proc, stderr=stderr_text)
 
-        if error_message is not None:
-            raise GitCommandError(error_message, 2, stderr=stderr_text)
-
         # read head information
         fp = open(join(self.repo.git_dir, 'FETCH_HEAD'), 'rb')
         fetch_head_info = [l.decode(defenc) for l in fp.readlines()]
@@ -646,10 +634,6 @@ def stdout_handler(line):
 
         try:
             handle_process_output(proc, stdout_handler, progress_handler, finalize_process)
-        except GitCommandError as err:
-            # convert any error from wait() into the same error with stdout lines
-            raise GitCommandError(err.command, err.status, progress.get_stderr())
-
         except Exception:
             if len(output) == 0:
                 raise

Diff for: git/remote.py

@@ -182,12 +182,16 @@ def __init__(self):
         self._cur_line = None
         self._error_lines = []
 
-    def get_stderr(self):
-        return '\n'.join(self._error_lines)
+    def error_lines(self):
+        """Returns all lines that started with error: or fatal:"""
+        return self._error_lines
 
     def _parse_progress_line(self, line):
         """Parse progress information from the given line as retrieved by git-push
-        or git-fetch
+        or git-fetch.
+
+        Lines that seem to contain an error (i.e. start with error: or fatal:) are stored
+        separately and can be queried using `error_lines()`.
 
         :return: list(line, ...) list of lines that could not be processed"""
         # handle
@@ -775,7 +779,7 @@ def done(self):
     def wait(self, stderr=b''):
         self.cv.acquire()
         while self.count > 0:
-            self.cv.wait(strerr=stderr)
+            self.cv.wait()
         self.cv.release()