It seems zlib works differently in py26, and thus requires special handling.

This also explains why the tests suddenly stopped working - after all, the interpreter changed ... .

Author: Byron

Diff for: gitdb/stream.py

@@ -7,6 +7,7 @@
 
 import mmap
 import os
+import sys
 import zlib
 
 from gitdb.fun import (
@@ -30,6 +31,7 @@
 from gitdb.utils.encoding import force_bytes
 
 has_perf_mod = False
+PY26 = sys.version_info[:2] < (2, 7)
 try:
     from _perf import apply_delta as c_apply_delta
     has_perf_mod = True
@@ -275,10 +277,14 @@ def read(self, size=-1):
         # We feed possibly overlapping chunks, which is why the unconsumed tail
         # has to be taken into consideration, as well as the unused data
         # if we hit the end of the stream
-        # NOTE: For some reason, the code worked for a long time with substracting unconsumed_tail
-        # Now, however, it really asks for unused_data, and I wonder whether unconsumed_tail still has to 
-        # be substracted. On the plus side, the tests work, so it seems to be ok for py 2.7 and 3.4
-        self._cbr += len(indata) - len(self._zip.unconsumed_tail) - len(self._zip.unused_data)
+        # NOTE: Behavior changed in PY2.7 onward, which requires special handling to make the tests work properly.
+        # They are thorough, and I assume it is truly working.
+        if PY26:
+            unused_datalen = len(self._zip.unconsumed_tail)
+        else:
+            unused_datalen = len(self._zip.unconsumed_tail) + len(self._zip.unused_data)
+        # end handle very special case ... 
+        self._cbr += len(indata) - unused_datalen
         self._br += len(dcompdat)
 
         if dat:
@@ -505,7 +511,6 @@ def new(cls, stream_list):
         if stream_list[-1].type_id in delta_types:
             raise ValueError("Cannot resolve deltas if there is no base object stream, last one was type: %s" % stream_list[-1].type)
         # END check stream
-
         return cls(stream_list)
 
     #} END interface

Diff for: gitdb/test/test_stream.py

@@ -27,8 +27,6 @@
 
 import tempfile
 import os
-import sys
-from nose import SkipTest
 
 class TestStream(TestBase):
     """Test stream classes"""
@@ -71,16 +69,10 @@ def _assert_stream_reader(self, stream, cdata, rewind_stream=lambda s: None):
         # END handle special type
 
     def test_decompress_reader(self):
-        cache = dict()
         for close_on_deletion in range(2):
             for with_size in range(2):
                 for ds in self.data_sizes:
-                    if ds in cache:
-                        cdata = cache[ds]
-                    else:
-                        cdata = make_bytes(ds, randomize=False)
-                        cache[ds] = cdata
-                    # end handle caching (maybe helps on py2.6 ?)
+                    cdata = make_bytes(ds, randomize=False)
 
                     # zdata = zipped actual data
                     # cdata = original content data
@@ -128,9 +120,6 @@ def test_sha_writer(self):
         assert writer.sha() != prev_sha
 
     def test_compressed_writer(self):
-        if sys.version_info[:2] < (2,7) and os.environ.get('TRAVIS'):
-            raise SkipTest("For some reason, this test STALLS on travis ci on py2.6, but works on my centos py2.6 interpreter")
-        # end special case ... 
         for ds in self.data_sizes:
             fd, path = tempfile.mkstemp()
             ostream = FDCompressedSha1Writer(fd)