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"""Tests for the reftable refs storage format."""
import tempfile
import unittest
from io import BytesIO
from dulwich.reftable import (
REF_VALUE_REF,
REF_VALUE_SYMREF,
RefBlock,
RefRecord,
ReftableReader,
ReftableRefsContainer,
ReftableWriter,
decode_varint_from_stream,
encode_varint,
)
class TestVarintEncoding(unittest.TestCase):
"""Test varint encoding/decoding."""
def test_encode_decode_small(self):
"""Test encoding/decoding small integers."""
for i in range(128):
encoded = encode_varint(i)
stream = BytesIO(encoded)
decoded = decode_varint_from_stream(stream)
self.assertEqual(i, decoded)
def test_encode_decode_large(self):
"""Test encoding/decoding larger integers."""
test_values = [127, 128, 255, 256, 16383, 16384, 65535, 65536, 1048576]
for i in test_values:
encoded = encode_varint(i)
stream = BytesIO(encoded)
decoded = decode_varint_from_stream(stream)
self.assertEqual(i, decoded)
class TestRefRecord(unittest.TestCase):
"""Test ref record encoding/decoding."""
def test_encode_decode_ref(self):
"""Test encoding/decoding a direct ref."""
sha = b"a" * 40
ref = RefRecord(b"refs/heads/master", REF_VALUE_REF, sha)
encoded = ref.encode()
stream = BytesIO(encoded)
decoded_ref, refname = RefRecord.decode(stream)
self.assertEqual(ref.refname, decoded_ref.refname)
self.assertEqual(ref.value_type, decoded_ref.value_type)
self.assertEqual(ref.value, decoded_ref.value)
self.assertEqual(b"refs/heads/master", refname)
def test_encode_decode_symref(self):
"""Test encoding/decoding a symbolic ref."""
target = b"refs/heads/main"
ref = RefRecord(b"HEAD", REF_VALUE_SYMREF, target)
encoded = ref.encode()
stream = BytesIO(encoded)
decoded_ref, refname = RefRecord.decode(stream)
self.assertEqual(ref.refname, decoded_ref.refname)
self.assertEqual(ref.value_type, decoded_ref.value_type)
self.assertEqual(ref.value, decoded_ref.value)
self.assertEqual(b"HEAD", refname)
def test_prefix_compression(self):
"""Test prefix compression in ref encoding."""
ref2 = RefRecord(b"refs/heads/main", REF_VALUE_REF, b"b" * 40)
# Encode ref2 with ref1 as prefix
encoded = ref2.encode(b"refs/heads/master")
# Should be shorter due to common prefix
encoded_no_prefix = ref2.encode()
self.assertLess(len(encoded), len(encoded_no_prefix))
# Decode should still work
stream = BytesIO(encoded)
_decoded_ref, refname = RefRecord.decode(stream, b"refs/heads/master")
self.assertEqual(b"refs/heads/main", refname)
class TestRefBlock(unittest.TestCase):
"""Test ref block encoding/decoding."""
def test_encode_decode_block(self):
"""Test encoding/decoding a ref block."""
block = RefBlock()
block.add_ref(b"refs/heads/master", REF_VALUE_REF, b"a" * 40)
block.add_ref(b"refs/heads/main", REF_VALUE_REF, b"b" * 40)
block.add_ref(b"HEAD", REF_VALUE_SYMREF, b"refs/heads/master")
encoded = block.encode()
decoded_block = RefBlock.decode(encoded)
self.assertEqual(len(block.refs), len(decoded_block.refs))
# Check that refs are sorted
ref_names = [ref.refname for ref in decoded_block.refs]
self.assertEqual(ref_names, sorted(ref_names))
class TestReftableIO(unittest.TestCase):
"""Test reftable file I/O."""
def test_write_read_reftable(self):
"""Test writing and reading a reftable file."""
with tempfile.NamedTemporaryFile() as f:
# Write reftable
writer = ReftableWriter(f)
writer.add_ref(b"refs/heads/master", b"a" * 40)
writer.add_ref(b"refs/heads/main", b"b" * 40)
writer.add_symbolic_ref(b"HEAD", b"refs/heads/master")
writer.write()
# Read reftable
f.seek(0)
reader = ReftableReader(f)
# Check refs
master_ref = reader.get_ref(b"refs/heads/master")
self.assertIsNotNone(master_ref)
self.assertEqual(master_ref[0], REF_VALUE_REF)
self.assertEqual(master_ref[1], b"a" * 40)
main_ref = reader.get_ref(b"refs/heads/main")
self.assertIsNotNone(main_ref)
self.assertEqual(main_ref[0], REF_VALUE_REF)
self.assertEqual(main_ref[1], b"b" * 40)
head_ref = reader.get_ref(b"HEAD")
self.assertIsNotNone(head_ref)
self.assertEqual(head_ref[0], REF_VALUE_SYMREF)
self.assertEqual(head_ref[1], b"refs/heads/master")
class TestReftableRefsContainer(unittest.TestCase):
"""Test ReftableRefsContainer functionality."""
def setUp(self):
"""Set up test environment."""
self.test_dir = tempfile.mkdtemp()
self.container = ReftableRefsContainer(self.test_dir)
def tearDown(self):
"""Clean up test environment."""
import shutil
shutil.rmtree(self.test_dir)
def test_empty_container(self):
"""Test operations on empty container."""
self.assertEqual(set(), self.container.allkeys())
with self.assertRaises(KeyError):
self.container.read_loose_ref(b"refs/heads/master")
def test_add_ref(self):
"""Test adding a reference."""
sha = b"a" * 40
success = self.container.add_if_new(b"refs/heads/master", sha)
self.assertTrue(success)
# Check ref exists
self.assertIn(b"refs/heads/master", self.container.allkeys())
self.assertEqual(sha, self.container.read_loose_ref(b"refs/heads/master"))
# Adding again should fail
success = self.container.add_if_new(b"refs/heads/master", b"b" * 40)
self.assertFalse(success)
def test_set_ref(self):
"""Test setting a reference."""
sha1 = b"a" * 40
sha2 = b"b" * 40
# Set initial ref
success = self.container.set_if_equals(b"refs/heads/master", None, sha1)
self.assertTrue(success)
# Update ref
success = self.container.set_if_equals(b"refs/heads/master", sha1, sha2)
self.assertTrue(success)
self.assertEqual(sha2, self.container.read_loose_ref(b"refs/heads/master"))
# Try to update with wrong old value
success = self.container.set_if_equals(b"refs/heads/master", sha1, b"c" * 40)
self.assertFalse(success)
self.assertEqual(sha2, self.container.read_loose_ref(b"refs/heads/master"))
def test_remove_ref(self):
"""Test removing a reference."""
sha = b"a" * 40
# Add ref
self.container.add_if_new(b"refs/heads/master", sha)
self.assertIn(b"refs/heads/master", self.container.allkeys())
# Remove ref
success = self.container.remove_if_equals(b"refs/heads/master", sha)
self.assertTrue(success)
self.assertNotIn(b"refs/heads/master", self.container.allkeys())
# Try to remove again
success = self.container.remove_if_equals(b"refs/heads/master", sha)
self.assertFalse(success)
def test_symbolic_ref(self):
"""Test symbolic references."""
# Add target ref
sha = b"a" * 40
self.container.add_if_new(b"refs/heads/master", sha)
# Add symbolic ref
self.container.set_symbolic_ref(b"HEAD", b"refs/heads/master")
# Check symbolic ref is stored correctly
self.assertEqual(
b"ref: refs/heads/master", self.container.read_loose_ref(b"HEAD")
)
self.assertIn(b"HEAD", self.container.allkeys())
# Check that following the symref works
self.assertEqual(sha, self.container[b"HEAD"])
def test_packed_refs(self):
"""Test packed refs functionality."""
refs = {
b"refs/heads/master": b"a" * 40,
b"refs/heads/main": b"b" * 40,
b"refs/tags/v1.0": b"c" * 40,
}
# Add packed refs
self.container.add_packed_refs(refs)
# Check refs exist
for refname, sha in refs.items():
self.assertIn(refname, self.container.allkeys())
self.assertEqual(sha, self.container.read_loose_ref(refname))
# Get packed refs
packed = self.container.get_packed_refs()
for refname, sha in refs.items():
self.assertEqual(sha, packed[refname])
def test_multiple_table_files(self):
"""Test with multiple reftable files."""
# Add some refs
self.container.add_if_new(b"refs/heads/master", b"a" * 40)
self.container.add_if_new(b"refs/heads/main", b"b" * 40)
# Update a ref (creates new table file)
self.container.set_if_equals(b"refs/heads/master", b"a" * 40, b"c" * 40)
# Check updated ref
self.assertEqual(b"c" * 40, self.container.read_loose_ref(b"refs/heads/master"))
self.assertEqual(b"b" * 40, self.container.read_loose_ref(b"refs/heads/main"))
# Should have multiple table files
table_files = self.container._get_table_files()
self.assertGreaterEqual(len(table_files), 2)
if __name__ == "__main__":
unittest.main()
|
