journal: fix compatibility with python2

This is a lazy workaround: 4c9a241
is amended to do nothing on python2, so we have the same issue that
was present before. This allows the code to execute, and hopefully
almost nobody is using python2 code anyway.

f868a56 is amended in the same way.
For python2 code we have the same lack of timezone-awareness as before.

This allows the tests to pass under python 2.7.

systemd/journal.py

@@ -51,7 +51,10 @@ def _convert_monotonic(m):
 def _convert_source_monotonic(s):
     return _datetime.timedelta(microseconds=int(s))
 
-_LOCAL_TIMEZONE = _datetime.datetime.now().astimezone().tzinfo
+try:
+    _LOCAL_TIMEZONE = _datetime.datetime.now().astimezone().tzinfo
+except TypeError:
+    _LOCAL_TIMEZONE = None
 
 def _convert_realtime(t):
     return _datetime.datetime.fromtimestamp(t / 1000000, _LOCAL_TIMEZONE)
@@ -313,7 +316,13 @@ def seek_realtime(self, realtime):
         >>> j.seek_realtime(yesterday)
         """
         if isinstance(realtime, _datetime.datetime):
-            realtime = int(float(realtime.astimezone().strftime("%s.%f")) * 1000000)
+            try:
+                realtime = realtime.astimezone()
+            except TypeError:
+                # With python2: Required argument 'tz' (pos 1) not found
+                pass
+
+            realtime = int(float(realtime.strftime("%s.%f")) * 1000000)
         elif not isinstance(realtime, int):
             realtime = int(realtime * 1000000)
         return super(Reader, self).seek_realtime(realtime)

systemd/test/test_journal.py

@@ -6,6 +6,7 @@
 import os
 import time
 import uuid
+import sys
 import traceback as _traceback
 
 from systemd import journal, id128
@@ -294,13 +295,16 @@ def test_reader_convert_timestamps(tmpdir):
     j = journal.Reader(path=tmpdir.strpath)
 
     val = j._convert_field('_SOURCE_REALTIME_TIMESTAMP', 1641651559324187)
-    assert val.tzinfo is not None
+    if sys.version_info >= (3,):
+        assert val.tzinfo is not None
 
     val = j._convert_field('__REALTIME_TIMESTAMP', 1641651559324187)
-    assert val.tzinfo is not None
+    if sys.version_info >= (3,):
+        assert val.tzinfo is not None
 
     val = j._convert_field('COREDUMP_TIMESTAMP', 1641651559324187)
-    assert val.tzinfo is not None
+    if sys.version_info >= (3,):
+        assert val.tzinfo is not None
 
 def test_seek_realtime(tmpdir):
     j = journal.Reader(path=tmpdir.strpath)