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# base.py
# Copyright (C) 2008, 2009 Michael Trier (mtrier@gmail.com) and contributors
#
# This module is part of GitPython and is released under
# the BSD License: http://www.opensource.org/licenses/bsd-license.php
from git.exc import WorkTreeRepositoryUnsupported
from git.util import LazyMixin, join_path_native, stream_copy, bin_to_hex
import gitdb.typ as dbtyp
import os.path as osp
from .util import get_object_type_by_name
# typing ------------------------------------------------------------------
from typing import Any, TYPE_CHECKING, Union
from git.types import PathLike, Commit_ish, Lit_commit_ish
if TYPE_CHECKING:
from git.repo import Repo
from gitdb.base import OStream
from .tree import Tree
from .blob import Blob
from .submodule.base import Submodule
from git.refs.reference import Reference
IndexObjUnion = Union["Tree", "Blob", "Submodule"]
# --------------------------------------------------------------------------
_assertion_msg_format = "Created object %r whose python type %r disagrees with the actual git object type %r"
__all__ = ("Object", "IndexObject")
class Object(LazyMixin):
"""Implements an Object which may be Blobs, Trees, Commits and Tags"""
NULL_HEX_SHA = "0" * 40
NULL_BIN_SHA = b"\0" * 20
TYPES = (
dbtyp.str_blob_type,
dbtyp.str_tree_type,
dbtyp.str_commit_type,
dbtyp.str_tag_type,
)
__slots__ = ("repo", "binsha", "size")
type: Union[Lit_commit_ish, None] = None
def __init__(self, repo: "Repo", binsha: bytes):
"""Initialize an object by identifying it by its binary sha.
All keyword arguments will be set on demand if None.
:param repo: repository this object is located in
:param binsha: 20 byte SHA1"""
super(Object, self).__init__()
self.repo = repo
self.binsha = binsha
assert len(binsha) == 20, "Require 20 byte binary sha, got %r, len = %i" % (
binsha,
len(binsha),
)
@classmethod
def new(cls, repo: "Repo", id: Union[str, "Reference"]) -> Commit_ish:
"""
:return: New Object instance of a type appropriate to the object type behind
id. The id of the newly created object will be a binsha even though
the input id may have been a Reference or Rev-Spec
:param id: reference, rev-spec, or hexsha
:note: This cannot be a __new__ method as it would always call __init__
with the input id which is not necessarily a binsha."""
return repo.rev_parse(str(id))
@classmethod
def new_from_sha(cls, repo: "Repo", sha1: bytes) -> Commit_ish:
"""
:return: new object instance of a type appropriate to represent the given
binary sha1
:param sha1: 20 byte binary sha1"""
if sha1 == cls.NULL_BIN_SHA:
# the NULL binsha is always the root commit
return get_object_type_by_name(b"commit")(repo, sha1)
# END handle special case
oinfo = repo.odb.info(sha1)
inst = get_object_type_by_name(oinfo.type)(repo, oinfo.binsha)
inst.size = oinfo.size
return inst
def _set_cache_(self, attr: str) -> None:
"""Retrieve object information"""
if attr == "size":
oinfo = self.repo.odb.info(self.binsha)
self.size = oinfo.size # type: int
# assert oinfo.type == self.type, _assertion_msg_format % (self.binsha, oinfo.type, self.type)
else:
super(Object, self)._set_cache_(attr)
def __eq__(self, other: Any) -> bool:
""":return: True if the objects have the same SHA1"""
if not hasattr(other, "binsha"):
return False
return self.binsha == other.binsha
def __ne__(self, other: Any) -> bool:
""":return: True if the objects do not have the same SHA1"""
if not hasattr(other, "binsha"):
return True
return self.binsha != other.binsha
def __hash__(self) -> int:
""":return: Hash of our id allowing objects to be used in dicts and sets"""
return hash(self.binsha)
def __str__(self) -> str:
""":return: string of our SHA1 as understood by all git commands"""
return self.hexsha
def __repr__(self) -> str:
""":return: string with pythonic representation of our object"""
return '<git.%s "%s">' % (self.__class__.__name__, self.hexsha)
@property
def hexsha(self) -> str:
""":return: 40 byte hex version of our 20 byte binary sha"""
# b2a_hex produces bytes
return bin_to_hex(self.binsha).decode("ascii")
@property
def data_stream(self) -> "OStream":
""":return: File Object compatible stream to the uncompressed raw data of the object
:note: returned streams must be read in order"""
return self.repo.odb.stream(self.binsha)
def stream_data(self, ostream: "OStream") -> "Object":
"""Writes our data directly to the given output stream
:param ostream: File object compatible stream object.
:return: self"""
istream = self.repo.odb.stream(self.binsha)
stream_copy(istream, ostream)
return self
class IndexObject(Object):
"""Base for all objects that can be part of the index file , namely Tree, Blob and
SubModule objects"""
__slots__ = ("path", "mode")
# for compatibility with iterable lists
_id_attribute_ = "path"
def __init__(
self,
repo: "Repo",
binsha: bytes,
mode: Union[None, int] = None,
path: Union[None, PathLike] = None,
) -> None:
"""Initialize a newly instanced IndexObject
:param repo: is the Repo we are located in
:param binsha: 20 byte sha1
:param mode:
is the stat compatible file mode as int, use the stat module
to evaluate the information
:param path:
is the path to the file in the file system, relative to the git repository root, i.e.
file.ext or folder/other.ext
:note:
Path may not be set of the index object has been created directly as it cannot
be retrieved without knowing the parent tree."""
super(IndexObject, self).__init__(repo, binsha)
if mode is not None:
self.mode = mode
if path is not None:
self.path = path
def __hash__(self) -> int:
"""
:return:
Hash of our path as index items are uniquely identifiable by path, not
by their data !"""
return hash(self.path)
def _set_cache_(self, attr: str) -> None:
if attr in IndexObject.__slots__:
# they cannot be retrieved lateron ( not without searching for them )
raise AttributeError(
"Attribute '%s' unset: path and mode attributes must have been set during %s object creation"
% (attr, type(self).__name__)
)
else:
super(IndexObject, self)._set_cache_(attr)
# END handle slot attribute
@property
def name(self) -> str:
""":return: Name portion of the path, effectively being the basename"""
return osp.basename(self.path)
@property
def abspath(self) -> PathLike:
"""
:return:
Absolute path to this index object in the file system ( as opposed to the
.path field which is a path relative to the git repository ).
The returned path will be native to the system and contains '\' on windows."""
if self.repo.working_tree_dir is not None:
return join_path_native(self.repo.working_tree_dir, self.path)
else:
raise WorkTreeRepositoryUnsupported("Working_tree_dir was None or empty")