diff --git a/git/index/fun.py b/git/index/fun.py
@@ -36,7 +36,7 @@
)
from git.util import IndexFileSHA1Writer, finalize_process

-from .typ import BaseIndexEntry, IndexEntry, CE_NAMEMASK, CE_STAGESHIFT
from .util import pack, unpack

# typing -----------------------------------------------------------------------------
@@ -158,7 +158,7 @@ def write_cache(
    write = stream_sha.write

    # Header
-    version = 2
    write(b"DIRC")
    write(pack(">LL", version, len(entries)))

@@ -172,6 +172,8 @@ def write_cache(
        plen = len(path) & CE_NAMEMASK  # Path length
        assert plen == len(path), "Path %s too long to fit into index" % entry.path
        flags = plen | (entry.flags & CE_NAMEMASK_INV)  # Clear possible previous values.
        write(
            pack(
                ">LLLLLL20sH",
@@ -185,6 +187,8 @@ def write_cache(
                flags,
            )
        )
        write(path)
        real_size = (tell() - beginoffset + 8) & ~7
        write(b"\0" * ((beginoffset + real_size) - tell()))
@@ -206,8 +210,7 @@ def read_header(stream: IO[bytes]) -> Tuple[int, int]:
    unpacked = cast(Tuple[int, int], unpack(">LL", stream.read(4 * 2)))
    version, num_entries = unpacked

-    # TODO: Handle version 3: extended data, see read-cache.c.
-    assert version in (1, 2), "Unsupported git index version %i, only 1 and 2 are supported" % version
    return version, num_entries


@@ -260,12 +263,15 @@ def read_cache(
        ctime = unpack(">8s", read(8))[0]
        mtime = unpack(">8s", read(8))[0]
        (dev, ino, mode, uid, gid, size, sha, flags) = unpack(">LLLLLL20sH", read(20 + 4 * 6 + 2))
        path_size = flags & CE_NAMEMASK
        path = read(path_size).decode(defenc)

        real_size = (tell() - beginoffset + 8) & ~7
        read((beginoffset + real_size) - tell())
-        entry = IndexEntry((mode, sha, flags, path, ctime, mtime, dev, ino, uid, gid, size))
        # entry_key would be the method to use, but we save the effort.
        entries[(path, entry.stage)] = entry
        count += 1

diff --git a/git/index/typ.py b/git/index/typ.py
@@ -32,6 +32,9 @@
CE_VALID = 0x8000
CE_STAGESHIFT = 12

# } END invariants


@@ -87,6 +90,8 @@ class BaseIndexEntryHelper(NamedTuple):
    uid: int = 0
    gid: int = 0
    size: int = 0


class BaseIndexEntry(BaseIndexEntryHelper):
@@ -102,7 +107,7 @@ def __new__(
        cls,
        inp_tuple: Union[
            Tuple[int, bytes, int, PathLike],
-            Tuple[int, bytes, int, PathLike, bytes, bytes, int, int, int, int, int],
        ],
    ) -> "BaseIndexEntry":
        """Override ``__new__`` to allow construction from a tuple for backwards
@@ -134,6 +139,14 @@ def stage(self) -> int:
        """
        return (self.flags & CE_STAGEMASK) >> CE_STAGESHIFT

    @classmethod
    def from_blob(cls, blob: Blob, stage: int = 0) -> "BaseIndexEntry":
        """:return: Fully equipped BaseIndexEntry at the given stage"""

diff --git a/test/test_index.py b/test/test_index.py
@@ -1218,6 +1218,48 @@ def test_index_add_non_normalized_path(self, rw_repo):

        rw_repo.index.add(non_normalized_path)


class TestIndexUtils:
    @pytest.mark.parametrize("file_path_type", [str, Path])
Original file line number	Diff line number	Diff line change
Expand Up		@@ -1218,6 +1218,48 @@ def test_index_add_non_normalized_path(self, rw_repo):

		rw_repo.index.add(non_normalized_path)


		class TestIndexUtils:
		@pytest.mark.parametrize("file_path_type", [str, Path])