remote, gitpython-developers#525: FIX BUG push-cmd misses error messages

+ Bug discovered after enabling TC in prev commit and rework of fetch.
+ remote_tc: unitestize assertions.
+ util: DEL unused `_mktemp()`.

Conflicts:
	git/test/lib/helper.py
	git/test/test_remote.py

git/cmd.py

@@ -247,7 +247,7 @@ def __del__(self):
         def __getattr__(self, attr):
             return getattr(self.proc, attr)
 
-        def wait(self, stderr=b''):
+        def wait(self, stderr=b''):  # TODO: Bad choice to mimic `proc.wait()` but with different args.
             """Wait for the process and return its status code.
 
             :param stderr: Previously read value of stderr, in case stderr is already closed.

git/remote.py

@@ -27,7 +27,6 @@
 )
 from git.util import (
     join_path,
-    finalize_process
 )
 from git.cmd import handle_process_output, Git
 from gitdb.util import join
@@ -681,16 +680,19 @@ def stdout_handler(line):
             try:
                 output.append(PushInfo._from_line(self, line))
             except ValueError:
-                # if an error happens, additional info is given which we cannot parse
+                # If an error happens, additional info is given which we parse below.
                 pass
-            # END exception handling
-        # END for each line
 
+        handle_process_output(proc, stdout_handler, progress_handler, finalizer=None, decode_streams=False)
+        stderr_text = progress.error_lines and '\n'.join(progress.error_lines) or ''
         try:
-            handle_process_output(proc, stdout_handler, progress_handler, finalize_process, decode_streams=False)
+            proc.wait(stderr=stderr_text)
         except Exception:
-            if len(output) == 0:
+            if not output:
                 raise
+            elif stderr_text:
+                log.warning("Error lines received while fetching: %s", stderr_text)
+
         return output
 
     def _assert_refspec(self):

git/test/lib/helper.py

@@ -13,8 +13,9 @@
 import textwrap
 import time
 from unittest import TestCase
+import unittest
 
-from git.compat import string_types, is_win
+from git.compat import string_types, is_win, PY3
 from git.util import rmtree
 
 import os.path as osp
@@ -68,18 +69,6 @@ def wait(self):
 #{ Decorators
 
 
-def _mktemp(*args):
-    """Wrapper around default tempfile.mktemp to fix an osx issue
-    :note: the OSX special case was removed as it was unclear why that was needed in the first place. It seems
-    to be just fine without it. However, if we leave this special case, and if TMPDIR is set to something custom,
-    prefixing /private/ will lead to incorrect paths on OSX."""
-    tdir = tempfile.mktemp(*args)
-    # See :note: above to learn why this is comented out.
-    # if is_darwin:
-    #     tdir = '/private' + tdir
-    return tdir
-
-
 def with_rw_directory(func):
     """Create a temporary directory which can be written to, remove it if the
     test succeeds, but leave it otherwise to aid additional debugging"""
@@ -129,7 +118,7 @@ def repo_creator(self):
             if bare:
                 prefix = ''
             # END handle prefix
-            repo_dir = _mktemp("%sbare_%s" % (prefix, func.__name__))
+            repo_dir = tempfile.mktemp("%sbare_%s" % (prefix, func.__name__))
             rw_repo = self.rorepo.clone(repo_dir, shared=True, bare=bare, n=True)
 
             rw_repo.head.commit = rw_repo.commit(working_tree_ref)
@@ -222,8 +211,8 @@ def argument_passer(func):
 
         @wraps(func)
         def remote_repo_creator(self):
-            remote_repo_dir = _mktemp("remote_repo_%s" % func.__name__)
-            repo_dir = _mktemp("remote_clone_non_bare_repo")
+            remote_repo_dir = tempfile.mktemp("remote_repo_%s" % func.__name__)
+            repo_dir = tempfile.mktemp("remote_clone_non_bare_repo")
 
             rw_remote_repo = self.rorepo.clone(remote_repo_dir, shared=True, bare=True)
             # recursive alternates info ?
@@ -340,6 +329,9 @@ class TestBase(TestCase):
       of the project history ( to assure tests don't fail for others ).
     """
 
+    if not PY3:
+        assertRaisesRegex = unittest.TestCase.assertRaisesRegexp
+
     def _small_repo_url(self):
         """:return" a path to a small, clonable repository"""
         from git.cmd import Git