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# Copyright (C) 2010, 2011 Sebastian Thiel (byronimo@gmail.com) and contributors
#
# This module is part of GitDB and is released under
# the New BSD License: https://opensource.org/license/bsd-3-clause/
"""Test everything about packs reading and writing"""
from gitdb.test.lib import (
TestBase,
with_rw_directory,
fixture_path
)
from gitdb.stream import DeltaApplyReader
from gitdb.pack import (
PackEntity,
PackIndexFile,
PackFile
)
from gitdb.base import (
OInfo,
OStream,
)
from gitdb.fun import delta_types
from gitdb.exc import UnsupportedOperation
from gitdb.util import to_bin_sha
import pytest
import os
import tempfile
#{ Utilities
def bin_sha_from_filename(filename):
return to_bin_sha(os.path.splitext(os.path.basename(filename))[0][5:])
#} END utilities
class TestPack(TestBase):
packindexfile_v1 = (fixture_path('packs/pack-c0438c19fb16422b6bbcce24387b3264416d485b.idx'), 1, 67)
packindexfile_v2 = (fixture_path('packs/pack-11fdfa9e156ab73caae3b6da867192221f2089c2.idx'), 2, 30)
packindexfile_v2_3_ascii = (fixture_path('packs/pack-a2bf8e71d8c18879e499335762dd95119d93d9f1.idx'), 2, 42)
packfile_v2_1 = (fixture_path('packs/pack-c0438c19fb16422b6bbcce24387b3264416d485b.pack'), 2, packindexfile_v1[2])
packfile_v2_2 = (fixture_path('packs/pack-11fdfa9e156ab73caae3b6da867192221f2089c2.pack'), 2, packindexfile_v2[2])
packfile_v2_3_ascii = (
fixture_path('packs/pack-a2bf8e71d8c18879e499335762dd95119d93d9f1.pack'), 2, packindexfile_v2_3_ascii[2])
def _assert_index_file(self, index, version, size):
assert index.packfile_checksum() != index.indexfile_checksum()
assert len(index.packfile_checksum()) == 20
assert len(index.indexfile_checksum()) == 20
assert index.version() == version
assert index.size() == size
assert len(index.offsets()) == size
# get all data of all objects
for oidx in range(index.size()):
sha = index.sha(oidx)
assert oidx == index.sha_to_index(sha)
entry = index.entry(oidx)
assert len(entry) == 3
assert entry[0] == index.offset(oidx)
assert entry[1] == sha
assert entry[2] == index.crc(oidx)
# verify partial sha
for l in (4, 8, 11, 17, 20):
assert index.partial_sha_to_index(sha[:l], l * 2) == oidx
# END for each object index in indexfile
self.assertRaises(ValueError, index.partial_sha_to_index, "\0", 2)
def _assert_pack_file(self, pack, version, size):
assert pack.version() == 2
assert pack.size() == size
assert len(pack.checksum()) == 20
num_obj = 0
for obj in pack.stream_iter():
num_obj += 1
info = pack.info(obj.pack_offset)
stream = pack.stream(obj.pack_offset)
assert info.pack_offset == stream.pack_offset
assert info.type_id == stream.type_id
assert hasattr(stream, 'read')
# it should be possible to read from both streams
assert obj.read() == stream.read()
streams = pack.collect_streams(obj.pack_offset)
assert streams
# read the stream
try:
dstream = DeltaApplyReader.new(streams)
except ValueError:
# ignore these, old git versions use only ref deltas,
# which we haven't resolved ( as we are without an index )
# Also ignore non-delta streams
continue
# END get deltastream
# read all
data = dstream.read()
assert len(data) == dstream.size
# test seek
dstream.seek(0)
assert dstream.read() == data
# read chunks
# NOTE: the current implementation is safe, it basically transfers
# all calls to the underlying memory map
# END for each object
assert num_obj == size
def test_pack_index(self):
# check version 1 and 2
for indexfile, version, size in (self.packindexfile_v1, self.packindexfile_v2):
index = PackIndexFile(indexfile)
self._assert_index_file(index, version, size)
# END run tests
def test_pack(self):
# there is this special version 3, but apparently its like 2 ...
for packfile, version, size in (self.packfile_v2_3_ascii, self.packfile_v2_1, self.packfile_v2_2):
pack = PackFile(packfile)
self._assert_pack_file(pack, version, size)
# END for each pack to test
@with_rw_directory
def test_pack_entity(self, rw_dir):
pack_objs = list()
for packinfo, indexinfo in ((self.packfile_v2_1, self.packindexfile_v1),
(self.packfile_v2_2, self.packindexfile_v2),
(self.packfile_v2_3_ascii, self.packindexfile_v2_3_ascii)):
packfile, version, size = packinfo
indexfile, version, size = indexinfo
entity = PackEntity(packfile)
assert entity.pack().path() == packfile
assert entity.index().path() == indexfile
pack_objs.extend(entity.stream_iter())
count = 0
for info, stream in zip(entity.info_iter(), entity.stream_iter()):
count += 1
assert info.binsha == stream.binsha
assert len(info.binsha) == 20
assert info.type_id == stream.type_id
assert info.size == stream.size
# we return fully resolved items, which is implied by the sha centric access
assert not info.type_id in delta_types
# try all calls
assert len(entity.collect_streams(info.binsha))
oinfo = entity.info(info.binsha)
assert isinstance(oinfo, OInfo)
assert oinfo.binsha is not None
ostream = entity.stream(info.binsha)
assert isinstance(ostream, OStream)
assert ostream.binsha is not None
# verify the stream
try:
assert entity.is_valid_stream(info.binsha, use_crc=True)
except UnsupportedOperation:
pass
# END ignore version issues
assert entity.is_valid_stream(info.binsha, use_crc=False)
# END for each info, stream tuple
assert count == size
# END for each entity
# pack writing - write all packs into one
# index path can be None
pack_path1 = tempfile.mktemp('', "pack1", rw_dir)
pack_path2 = tempfile.mktemp('', "pack2", rw_dir)
index_path = tempfile.mktemp('', 'index', rw_dir)
iteration = 0
def rewind_streams():
for obj in pack_objs:
obj.stream.seek(0)
# END utility
for ppath, ipath, num_obj in zip((pack_path1, pack_path2),
(index_path, None),
(len(pack_objs), None)):
iwrite = None
if ipath:
ifile = open(ipath, 'wb')
iwrite = ifile.write
# END handle ip
# make sure we rewind the streams ... we work on the same objects over and over again
if iteration > 0:
rewind_streams()
# END rewind streams
iteration += 1
with open(ppath, 'wb') as pfile:
pack_sha, index_sha = PackEntity.write_pack(pack_objs, pfile.write, iwrite, object_count=num_obj)
assert os.path.getsize(ppath) > 100
# verify pack
pf = PackFile(ppath)
assert pf.size() == len(pack_objs)
assert pf.version() == PackFile.pack_version_default
assert pf.checksum() == pack_sha
pf.close()
# verify index
if ipath is not None:
ifile.close()
assert os.path.getsize(ipath) > 100
idx = PackIndexFile(ipath)
assert idx.version() == PackIndexFile.index_version_default
assert idx.packfile_checksum() == pack_sha
assert idx.indexfile_checksum() == index_sha
assert idx.size() == len(pack_objs)
idx.close()
# END verify files exist
# END for each packpath, indexpath pair
# verify the packs thoroughly
rewind_streams()
entity = PackEntity.create(pack_objs, rw_dir)
count = 0
for info in entity.info_iter():
count += 1
for use_crc in range(2):
assert entity.is_valid_stream(info.binsha, use_crc)
# END for each crc mode
# END for each info
assert count == len(pack_objs)
entity.close()
def test_pack_64(self):
# TODO: hex-edit a pack helping us to verify that we can handle 64 byte offsets
# of course without really needing such a huge pack
pytest.skip('not implemented')
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